Zoosymposia https://www.mapress.com/zs <p><strong>Zoosymposia</strong> is a rapid journal for peer-reviewed papers (reviews or original papers) on special topics/themes in zoology. It is a sister series of <a href="https://www.mapress.com/zootaxa/">Zootaxa</a><strong> </strong>and is designed to allow volumes of collected papers covering a wide range of topics (e.g. ecology, conservation ...) outside the scope of <a href="https://www.mapress.com/zootaxa/">Zootaxa</a>. </p> Magnolia press en-US Zoosymposia 1178-9905 <p class="ZootaxaTitle"><strong>In Memorium: Donald J Reish</strong></p> https://www.mapress.com/zs/article/view/zoosymposia.19.1.4 <p class="NormalParagraphStyle">For such a humble man, his life had an outsized impact in so many ways. He rarely raised his voice, but he had a hearty laugh. Despite his competitive streak, we never saw him hold a grudge. He was honest, insightful, and treated everyone—regardless of gender, race, nationality, or religion—with respect. In his own words, “I am no different from anyone else—I think of myself as being more important than I actually am. I think that I made important contributions in two areas: teaching and research”. But, without Donald J Reish, the career of everyone who is reading these proceedings would likely be different.</p> KENNETH SCHIFF STEVEN BAY Copyright (c) 2020 Zoosymposia 2020-12-28 2020-12-28 19 8–9 8–9 10.11646/zoosymposia.19.1.4 <p class="ZootaxaTitle"><strong>Rodney Phillips Dales: influential annelid researcher, natural historian, editor, artist, gardener and architectural enthusiast (1927–2020)</strong></p> https://www.mapress.com/zs/article/view/zoosymposia.19.1.5 <p class="NormalParagraphStyle">Rodney Phillips Dales was born in Hornchurch, Essex on 15 January 1927. His father Sidney Phillips Dales was a Chartered Architect, his mother Muriel Emily (née Tattersall) kept the family home in the Squirrel’s Heath district, and frequently worked in her husband’s practice. Rodney and his brother Gordon (b. 1922) were raised in a strict Methodist family. They led a modest life, but one full of interest and diversion. Frequent trips to the seaside, and visits to buildings and artist friends of his father, helped shape Rodney’s interests and future career. He became fascinated by the diversity of the natural world and the wonderful architecture he encountered on his frequent bike rides into the Essex countryside.</p> ANDREW S.Y. MACKIE CLARE DALES R. MICHAEL L. KENT DAVID R. DIXON RUFUS M.G. WELLS LYNDA M. WARREN Copyright (c) 2020 Zoosymposia 2020-12-28 2020-12-28 19 10–26 10–26 10.11646/zoosymposia.19.1.5 <p class="ZootaxaTitle"><strong>Obituary: William John Haugen Light (1938–2020)</strong></p> https://www.mapress.com/zs/article/view/zoosymposia.19.1.6 <p class="NormalParagraphStyle">William John Haugen (Bill) Light (Fig. 1) was born on 05 January 1938 in Waco, McLennan County, Texas USA, and died on 18 January 2020 in Marietta, Georgia, at the age of 82. He was buried in the Georgia National Cemetery, Canton, GA. As an infant, he was adopted by Col. Orin Haugen and his wife Marion Sargent. Colonel Haugen died in February 1945 at the battle for Manilla in the Philippines in World War II. Later, upon Marion’s remarriage, Bill’s surname was changed to Light. Bill’s mother Marion passed away in 1969.</p> JAMES A. BLAKE JAMES T. CARLTON JERRY D. KUDENOV Copyright (c) 2020 Zoosymposia 2020-12-28 2020-12-28 19 27–30 27–30 10.11646/zoosymposia.19.1.6 <p class="ZootaxaTitle"><strong>Obituary: Robert Eugene Ruff (1947–2017)</strong></p> https://www.mapress.com/zs/article/view/zoosymposia.19.1.7 <p class="NormalParagraphStyle">Robert Eugene Ruff (Fig. 1A) was born on 13 April 1947 in Allendale, Michigan, USA, and died on 26 November 2017 at his home in Puyallup, Washington, at the age of 70. Shortly after his birth, his family moved to the State of Washington where he lived for much of his life. He graduated from Clover Park High School, Tacoma, WA, in 1965 and subsequently attended the University of Washington, where he graduated with a B.S. in Biological Oceanography in 1971. While a student at the University of Washington, he married his high school sweetheart, Lorraine Marie Charlton on 17 July 1968.</p> JAMES A. BLAKE MARGARET DUTCH NANCY J. MACIOLEK Copyright (c) 2020 Zoosymposia 2020-12-28 2020-12-28 19 31–32 31–32 10.11646/zoosymposia.19.1.7 <p class="ZootaxaTitle"><strong>Obituary: Alexander Vladimirovich Rzhavsky (1959–2018)</strong></p> https://www.mapress.com/zs/article/view/zoosymposia.19.1.8 <p class="NormalParagraphStyle">Alexander (or Sasha as he was known and preferred to be addressed by his friends) Rzhavsky was born in Moscow, then USSR on 25 August 1959, which means he would have turned 60 soon after the 13<sup>th</sup> International Polychaete Conference held in Long Beach in August 2019. He was one of those “natural born biologists” whose keen interest in biology became obvious when he was still a child and this interest developed into both profession and life-time passion. In 1976 Alexander graduated from one of the high schools in Moscow that had a specialization in biology and a year later he started his undergraduate studies at Biological Faculty of Moscow Lomonosov State University. He started doing research at the Department of Zoology and Comparative Anatomy of Invertebrates as an undergraduate and that was the time when his scientific interests were determined, as both his Honors and Master’s projects were dedicated to polychaetes, the animals Sasha continued to study for the rest of his life. His diploma thesis was entitled “Ecology of <em>Janua </em>(<em>Dexiospira</em>)<em> nipponica </em>and <em>J. </em>(<em>D.</em>)<em> alveolata </em>(Polychaeta, Spirorbidae) near the southern shore of the Primorye and the morphology of their tubes”. Based on the results of these student projects Alexander published his first two research papers.</p> ELENA KUPRIYANOVA Copyright (c) 2020 Zoosymposia 2020-12-28 2020-12-28 19 33–40 33–40 10.11646/zoosymposia.19.1.8 <p class="ZootaxaTitle"><strong>Community structure and seasonal changes in population structure of pelagic polychaetes collected by sediment traps moored in the subarctic and subtropical western North Pacific Ocean</strong></p> https://www.mapress.com/zs/article/view/zoosymposia.19.1.9 <p class="Abstract">Community structure and seasonal changes in the population structure of pelagic polychaetes were studied based on zooplankton samples collected by sediment traps moored at 200 m depth in the subarctic and subtropical western North Pacific throughout the year. Eight species belonging to seven genera and seven families occurred at the subarctic station, while twelve species belonging to ten genera and seven families were identified at the subtropical station. Polychaete abundance was 5.37 ± 0.44 ind. m<sup>-2</sup> day<sup>-1</sup> (annual mean ± standard error) at the subarctic station, and 1.36 ± 0.15 ind. m<sup>-2</sup> day<sup>-1</sup> at the subtropical station. Polychaete abundance at the subarctic station was high from May to August, but no seasonal patterns were observed at the subtropical station. The dominant species in the subarctic was <em>Tomopteris septentrionalis</em>, which accounted for 62.9% of annual mean abundance; at the subtropical station, the dominant species was <em>Pelagobia</em> sp. (22.8%). In the subarctic, small specimens of <em>T. septentrionalis </em>(&lt;3 mm in body length) occurred only in winter (December-March). No clear seasonal changes in population structure of the subtropical <em>Pelagobia</em> sp. were detected. The latitudinal patterns we observed in the polychaete communities of the western North Pacific were similar to those previously observed in the eastern North Pacific. Changes in the population structure of <em>T. septentrionalis</em> suggest that the life cycle of this species is seasonal in the subarctic region.</p> KANAKO AMEI NAOTO JIMI MINORU KITAMURA NAOYA YOKOI ATSUSHI YAMAGUCHI Copyright (c) 2020 Zoosymposia 2020-12-28 2020-12-28 19 41–50 41–50 10.11646/zoosymposia.19.1.9 <p class="ZootaxaTitle"><strong>Biodiversity of polychaetous annelids in Bahía de Todos Santos, Baja California México</strong></p> https://www.mapress.com/zs/article/view/zoosymposia.19.1.10 <p class="NormalParagraphStyle">The aim of this study was to describe and analyze the structure, distribution, and temporal variation in the composition of benthic polychaeta and their relation to abiotic characteristics in marine sediments along the continental shelf of Bahia de Todos Santos, Baja California, Mexico. Benthic macrofauna and environmental variables were collected to coordinated with a long-term ocean monitoring project known as the Southern California Bight Regional Monitoring Program. A total of nineteen stations were collected in September 1998, twenty stations in November 2003, fifteen stations in December 2013 and sixteen stations in September 2018. These data were compared to assess the response of benthic polychaete assemblages to natural and human induced changes in sediment characteristics. All stations were sampled using a Van Veen grab (0.1 m<sup>2</sup>) at depths between 15 to 206 m. Sites were selected using a multiple density nested random-tessellation stratified design. Environmental parameters measured included depth (m), sediment grain size &lt;63µm (%), organic carbon (%), and concentration of metals: Co, Cd, Cr, Cu, Fe, Mn, Ni, Pb, and Zn. A total of 11,854 polychaetous annelids were identified in 43 families, with the numerically dominant families for all years (Spionidae, Chaetopteridae, Cirratulidae, Maldanidae, Onuphidae, and Ampharetidae) accounting for 52.95% of individuals. The best represented families in 1998 were Spionidae, Maldanidae, Ampharetidae and Cirratulidae. In 2003 the best represented families were Spionidae, Maldanidae, Cirratulidae, and Onuphidae; in 2013 Chaetopteridae and Spionidae; and in 2018 Spionidae, Ampharetidae, Syllidae and Cirratulidae. The Bio-Env multivariate analysis showed that the factors that most correlated with the abundance and richness of families and had the greatest influence over spatial distribution trends for community structure were %Organic carbon and Cu concentration during 1998, % Organic carbon and depth in 2003 and Pb concentration in 2013.</p> OSMAR ARAUJO-LEYVA LUZ VERONICA RODRÍGUEZ-VILLANUEVA JOSÉ VINICIO MACÍAS-ZAMORA Copyright (c) 2020 Zoosymposia 2020-12-28 2020-12-28 19 51–71 51–71 10.11646/zoosymposia.19.1.10 <p class="ZootaxaTitle"><strong>Functional redundancy in polychaete assemblages from a tropical Large Marine Ecosystem (LME)</strong></p> https://www.mapress.com/zs/article/view/zoosymposia.19.1.11 <p class="Abstract">Functional redundancy assumes a critical relevance nowadays due to the serious threats that affect marine life worldwide. We assessed and compared levels of functional redundancy in polychaete assemblages from the continental shelf and from estuarine environments along the South Brazil Shelf Large Marine Ecosystem (SBSLME). To quantify functional redundancy, we used functional originality (FOri) and functional uniqueness (FUni). We found 57 and 47 polychaete taxa distributed in 48 and 41 functional entities (i.e., a unique combination of trait values) in continental shelf and estuarine environments, respectively. Results suggest a low level of functional redundancy in both environments. However, FOri was higher in the estuarine environment, whereas FUni was higher in the continental shelf. As expected, estuarine polychaetes have fewer unique combinations of trait values, but these combinations are more original and adequate to the varying conditions imposed by estuarine environmental drivers.</p> BARBARA C.G. GIMENEZ PAULO LANA Copyright (c) 2020 Zoosymposia 2020-12-28 2020-12-28 19 72–90 72–90 10.11646/zoosymposia.19.1.11 <p class="ZootaxaTitle"><strong>Nocturnally swarming Caribbean polychaetes of St. John, U.S. Virgin Islands, USA</strong></p> https://www.mapress.com/zs/article/view/zoosymposia.19.1.12 <p class="Abstract">Nocturnally swarming polychaetes were sampled over a ten-year period (2007–2017) in shallow waters of the Virgin Islands National Park, St. John, United States Virgin Islands. While sampling was qualitative and conducted over different years, months and lunar phases, some patterns were noted in the emergence of swarming polychaetes. Three families (Nereididae, Opheliidae, and Syllidae) had members that swarmed on most nights, while reproductive epitokes from two families appeared only during specific lunar phases: Goniadidae around the full moon and Phyllodocidae around the new moon. Additional polychaete families represented included Amphinomidae, Dorvilleidae, and Scalibregmatidae, whose members swarmed during the waning or waxing lunar phases. This overview offers new information about the timing of reproductive swarming in Caribbean polychaetes and suggests some connections between lunar phases and the swarming of different families.</p> NANCY K. PRENTISS Copyright (c) 2020 Zoosymposia 2020-12-28 2020-12-28 19 91–102 91–102 10.11646/zoosymposia.19.1.12 <p class="ZootaxaTitle"><strong>Novel symbiotic relationship between a spionid polychaete and <em>Lingula</em> (Brachiopoda: Lingulata: Lingulidae), with description of <em>Polydora lingulicola</em> sp. nov. (Annelida: Spionidae)</strong></p> https://www.mapress.com/zs/article/view/zoosymposia.19.1.13 <p class="Abstract">A new spionid species <em>Polydora lingulicola</em> <strong>sp. nov.</strong>, a novel symbiont of <em>Lingula anatina </em>Lamarck, 1801 is described here based on materials collected from the Yatsushiro Sea and Ariake Sea, southern Japan. <em>Polydora lingulicola</em> sp. nov., morphologically closest to <em>P</em>. <em>glycymerica</em> Radashevsky, 1993 and <em>P</em>. <em>vulgaris</em> Mohammad, 1972, is distinct from latter two shell-boring species by its smaller size, long maximum caruncle length, non-boring lifestyle, presence of subspherical yellow chromatophores on chaetiger 5 (visible in living specimens), and larval morphology. The new species was observed to construct mud tubes on the surfaces of <em>L</em>.<em> anatina </em>shells, with the tube apertures located near the lateral inhalant pseudosiphon of the hosts, and utilizes the water currents created by the filter-feeding host for feeding suspended food particles. <em>Polydora</em> <em>lingulicola</em> <strong>sp. nov.</strong> represents the first polychaetous annelid reported to exhibit an obligate symbiotic relationship with a lingulid brachiopod. Epibiotic polychaetes previously reported as<em> P</em>.<em> cornuta</em> Bosc, 1802 to occur on <em>L</em>.<em> anatina </em>shells from Japan in 1902 may belong to <em>P</em>. <em>lingulicola</em> <strong>sp. nov.</strong> The possibility that the wild populations of <em>P</em>. <em>lingulicola</em> <strong>sp. nov.</strong> may be vulnerable to extinction because they only associate with <em>L</em>. <em>anatina</em>, wild populations of which are near threatened by habitat loss, coastal pollution, and fishing pressure.</p> HIROKAZU ABE WAKA SATO-OKOSHI Copyright (c) 2020 Zoosymposia 2020-12-28 2020-12-28 19 103–120 103–120 10.11646/zoosymposia.19.1.13 <p class="ZootaxaTitle"><strong>A new genus and species of spionid polychaete (Annelida, Spionidae) from a deep-water cold seep site in the Eastern Mediterranean Sea off Turkey</strong></p> https://www.mapress.com/zs/article/view/zoosymposia.19.1.14 <p class="Abstract">A new spionid polychaete was discovered in deep-sea sediments in the eastern Mediterranean Sea during an expedition by the Ocean Exploration Trust. Specimens were collected by the E/V<em> Nautilus</em> in August 2012 off Turkey, at a depth of 2216 m on the Anaximander Seamount at the Amsterdam mud volcano site. Cores were taken from sediments covered with microbial mats. The new species belongs to the <em>Pygospiopsis-Atherospio</em> Group, which has unusual neuropodial hooks, modified neurosetae in some anterior setigers, and branchiae in middle body segments that are broad, flattened, and fused to the dorsal lamellae. The new species is assigned to a new genus and species, <em>Aciculaspio</em> <em>anaximanderi </em><strong>n. gen.</strong>, <strong>n. sp.</strong>, and is unusual in having a reduced setiger 1 lacking notosetae; well-developed pre- and postsetal lamellae that encompass the neurosetae and notosetae; notopodial lamellae free from the branchiae in anterior setigers that become fused and flattened in middle and posterior segments; unidentate hooded hooks in both noto- and neuropodia; neuropodial spines in setigers 4–10; and a pygidium with three anal cirri. <em>Aciculaspio anaximanderi</em> <strong>n. gen</strong>., <strong>n. sp</strong>. is the first species in the <em>Atherospio-Pygospiopsis</em> Group collected from a deep-water cold seep habitat.</p> JAMES A. BLAKE PATRICIA A. RAMEY-BALCI Copyright (c) 2020 Zoosymposia 2020-12-28 2020-12-28 19 121–134 121–134 10.11646/zoosymposia.19.1.14 <p class="ZootaxaTitle"><strong>Redescription of <em>Neanthes micromma</em> Harper, 1979 (Annelida: Nereididae) based on types and additional material from Tampa Bay, Florida, USA, with a discussion of ontogenetic morphological variation</strong></p> https://www.mapress.com/zs/article/view/zoosymposia.19.1.15 <p class="Abstract">Small specimens of a seemingly undescribed nereidid polychaete species from Tampa Bay, Florida, USA lacked notopodial falcigers, paragnaths and papillae on the pharynx, and dorsal ligules. Quantitative analysis of a larger size range of material showed that all specimens could be referred to <em>Nereis</em> (<em>Neanthes</em>) <em>micromma</em> Harper, 1979. The use of <em>Neanthes</em> Kinberg, 1865 as a subgenus of <em>Nereis</em> Linnaeus, 1758 is no longer accepted and this species is now formally referred to <em>Neanthes micromma</em> Harper, 1979, which is here redescribed to better account for the observed size-related variation. Contrary to the original description, in this species, notaciculae are present in chaetigers 1 and 2, but difficult to observe. Given that earlier studies have identified the potential phylogenetic significance of presence of notaciculae, it is suggested that re-evaluation of this character in similar Nereididae may assist in revising the status of the polyphyletic genus <em>Neanthes</em>.</p> JENNIFER S. DAVENPORT CHRISTOPHER J. GLASBY DAVID J. KARLEN Copyright (c) 2020 Zoosymposia 2020-12-28 2020-12-28 19 135–150 135–150 10.11646/zoosymposia.19.1.15 <p class="ZootaxaTitle"><strong>I know who you are, but do others know? Why correct scientific names are so important for the biological sciences</strong></p> https://www.mapress.com/zs/article/view/zoosymposia.19.1.16 <p class="Abstract">Researchers are continuing to identify polychaetes using inappropriate references and failing to appreciate that many if not most species have restricted distributions. Using <em>Marphysa sanguinea</em> (Montagu, 1813) as a case example, we discuss the loss of valuable data by misidentifying a species. We suggest ways in which this problem can be addressed by both taxonomists, ecologists and other researchers. Furthermore, this situation is not unique to polychaetes but applies to many other groups of marine invertebrates.</p> PAT HUTCHINGS NICOLAS LAVESQUE Copyright (c) 2020 Zoosymposia 2020-12-28 2020-12-28 19 151–163 151–163 10.11646/zoosymposia.19.1.16 <p class="ZootaxaTitle"><strong>A new interstitial genus and species of Acrocirridae from Okinawa-jima Island, Japan</strong></p> https://www.mapress.com/zs/article/view/zoosymposia.19.1.17 <p class="Abstract">A new interstitial acrocirrid, <em>Actaedrilus yanbarensis</em> <strong>gen et. sp. nov.</strong>, is described from Okinawa-jima Island, Japan. Individuals of the new genus and species were collected from the interstices of subtidal coarse sand (about 1 m depth). The new genus is comprised of the new species and <em>A.</em> <em>polyonyx</em> (Eliason, 1962) comb. nov. and it is characterized by the presence of two pairs of long branchiae, non-retractile head, minute body, and short club-shaped palps. We infer the phylogenetic position of <em>A. yanbarensis</em> gen. et sp. nov. within Acrocirridae using five gene markers (COI, 16S, 18S, 28S, Cyt B).</p> NAOTO JIMI SHINTA FUJIMOTO SATOSHI IMURA Copyright (c) 2020 Zoosymposia 2020-12-28 2020-12-28 19 164–172 164–172 10.11646/zoosymposia.19.1.17 <p class="ZootaxaTitle"><strong>New insights in the biogeographical distributions of two Spionidae (Annelida) from the NE Atlantic and Mediterranean French coasts</strong></p> https://www.mapress.com/zs/article/view/zoosymposia.19.1.18 <p class="Abstract">We report the first occurrences of <em>Spiophanes afer</em> Meißner, 2005 and <em>Prionospio cristaventralis</em> Delgado-Blas, Díaz-Díaz &amp; Viéitez, 2018 from French marine waters (from the southern part of the Bay of Biscay in NE Atlantic, and the Gulf of Lion in the Mediterranean Sea). Morphological characters of <em>S. afer</em> include the presence of an occipital antenna, dorsal ciliated organs extending to chaetigers 13–15, neuropodial hooks from chaetiger 15, ventrolateral intersegmental pouches from chaetigers 14–15, chaetal spreaders of “2+3 type”, and conspicuous dark brown pigmentation on parapodia of chaetigers 9–13. <em>Prionospio cristaventralis</em> has four pairs of branchiae (1<sup>st</sup> and 4<sup>th</sup> pinnate, 2<sup>nd</sup> and 3<sup>rd</sup> apinnate), ventral crests from chaetigers 11–12, high dorsal crests on chaetigers 10–11, and very large notopodial prechaetal lamellae on anterior chaetigers. Both records represent northern extensions of their known distributions. However, the presence of <em>S. afer</em> on French coasts may have been overlooked for several decades. The validity of the recently proposed <em>Spiophanes adriaticus</em> is questioned.</p> JÉRÔME JOURDE NICOLAS LAVESQUE CÉLINE LABRUNE JEAN-MICHEL AMOUROUX PAULO BONIFÁCIO SUZIE HUMBERT BASTIEN LAMARQUE PIERRE-GUY SAURIAU KARIN MEIßNER Copyright (c) 2020 Zoosymposia 2020-12-28 2020-12-28 19 173–184 173–184 10.11646/zoosymposia.19.1.18 <p class="ZootaxaTitle"><strong>On <em>Polycirrus changbunker</em> sp. nov. (Annelida: Terebelliformia: Polycirridae), a new species of polycirrid worms from southwestern Atlantic</strong></p> https://www.mapress.com/zs/article/view/zoosymposia.19.1.19 <p class="Abstract"><em>Polycirrus changbunker </em><strong>sp. nov. </strong>is herein described, from specimens collected off the states of Paraná (type locality, southern Brazil), São Paulo (southeastern Brazil), and Pernambuco and Paraíba (northeastern Brazil). Members of <em>Polycirrus changbunker </em><strong>sp. nov. </strong>present 31–43 pairs of notopodia, bearing pinnate and narrowly-winged chaetae, neuropodia beginning on segment 9, bearing type 1 uncini sensu Glasby &amp; Glasby (2006) throughout, paired ventro-lateral glandular pads on segments 3–13, and nephridial and genital papillae on segments 3–8. A full description for members of <em>Polycirrus changbunker </em><strong>sp. nov. </strong>is herein provided, together with a comparison with the individuals of the most similar congener species.</p> JOÃO MIGUEL DE MATOS NOGUEIRA PLINIO FERREIRA VAN DEURSEN NATÁLIA RANAURO ORLEMIR CARRERETTE Copyright (c) 2020 Zoosymposia 2020-12-28 2020-12-28 19 185–197 185–197 10.11646/zoosymposia.19.1.19 <p class="ZootaxaTitle"><strong>Distribution of<em> Sabellaria alveolata</em> (Polychaeta Sabellariidae) in the Mediterranean Sea: update and new findings</strong></p> https://www.mapress.com/zs/article/view/zoosymposia.19.1.20 <p class="Abstract">An update of the geographical distribution of the sabellariid polychaete <em>Sabellaria alveolata</em> (Linnaeus, 1767) within the Mediterranean Sea is provided after checking the known literature. This shallow-water, reef-forming species is first recorded from new sites in southeastern Sicily, both along the Sicily Straits and the Ionian Sea, from where <em>S. alveolata</em> was so far unknown.</p><p class="Abstract">These new collections also provided material for a detailed description and SEM documentation of morphological features of the operculum and the body.</p> ROSSANA SANFILIPPO A. GUIDO G. INSACCO C. DEIAS G. CATANIA A. REITANO R. LEONARDI A. ROSSO Copyright (c) 2020 Zoosymposia 2020-12-28 2020-12-28 19 198–208 198–208 10.11646/zoosymposia.19.1.20 <p class="ZootaxaTitle"><strong>Transformative <strong>notochaetae</strong>: larval development and metamorphosis in <em>Chrysopetalum </em>spp. (Chrysopetalinae: Chrysopetalidae: Annelida)</strong></p> https://www.mapress.com/zs/article/view/zoosymposia.19.1.21 <p class="Abstract">The morphology of an early nectochaete larva belonging to <em>Chrysopetalum</em> sp. is aligned with that of a planktotrophic larva at a crucial stage of benthic settlement: an entire provisional spinose notochaetal scleritome, large episphere with prostomial nascent sensory structures and larval podia and cirri of the anterior two segments in transition. Morphological sequences of post-larvae and juveniles, common to a number of <em>Chrysopetalum</em> species, indicate that long, slender, provisional, camerate notochaetal spines are replaced during metamorphosis and growth with an entire adult, camerate notochaetal scleritome consisting of broad paleae with internal, longitudinal ribs. The <em>Chrysopetalum</em> sp. six segment larva supports achaetous notopodia I and chaetous notopodia II, each with a pair of dorsal cirri, ie. 4 cirri in total; segment II has acirrose neuropodia. Individuals of post-larvae and juvenile <em>Chrysopetalum</em> species, 8–15 segments, possess a total of 6 cirri on segments I and II: segment I with a pair of tentacular dorsal cirri and the formation of a pair of tentacular ventral cirri, and segment II comprising a pair of dorsal cirri, spinous notochaetae and acirrose neuropodia. During metamorphosis the acirrous neuropodia of segment II are reabsorbed and replaced in stages with a pair of ventral tentacular cirri until the adult state is achieved: achaetous segment 1 with two pairs of tentacular cirri and segment II similar, ie. total of 8 cirri. The cirri arrangement of segments I and II before final metamorphosis in post-larval stages of <em>Chrysopetalum</em> species is, interestingly, that described for adults in the majority of other Chrysopetalinae taxa. Ontogenetic developmental processes of formation and loss of acirrose neuropodia and replacement of spinose larval notochaetae with adult paleae observed in <em>Chrysopetalum</em> species are compared with species of other taxa of the Chrysopetalinae.</p> CHARLOTTE WATSON Copyright (c) 2020 Zoosymposia 2020-12-28 2020-12-28 19 209–221 209–221 10.11646/zoosymposia.19.1.21 <strong>13th International Polychaete Conference (IPC13) (Cover)</strong> https://www.mapress.com/zs/article/view/zoosymposia.19.1.1 Cover GREG W. ROUSE SARA LINDSAY BRUNO PERNET Copyright (c) 2020 Zoosymposia 2020-12-28 2020-12-28 19 1–2 1–2 10.11646/zoosymposia.19.1.1 <strong>13th International Polychaete Conference (IPC13) (Table of Contents)</strong> https://www.mapress.com/zs/article/view/zoosymposia.19.1.2 Table of Contents GREG W. ROUSE SARA LINDSAY BRUNO PERNET Copyright (c) 2020 Zoosymposia 2020-12-28 2020-12-28 19 3–4 3–4 10.11646/zoosymposia.19.1.2 <p class="ZootaxaTitle"><strong>13<sup>th</sup> International Polychaete Conference (IPC13) Editorial</strong></p> https://www.mapress.com/zs/article/view/zoosymposia.19.1.3 <p class="NormalParagraphStyle">In 1989, Donald Reish hosted the 3<sup>rd</sup> International Polychaete Conference (IPC3) in Long Beach, on the campus of California State University Long Beach. In 2015 he asked one of us (Bruno Pernet) if it might be possible to bring IPC13 back to Long Beach, thirty years later. Bruno assembled a planning committee consisting of himself and Christine Whitcraft (CSU Long Beach), Kirk Fitzhugh and Leslie Harris (Natural History Museum of Los Angeles County), and Larry Lovell (Dancing Coyote Environmental). The committee’s proposal was accepted at the International Polychaetology Association (IPA) general meeting in Wales in 2016, and the planning committee morphed into an organizational committee!</p> BRUNO PERNET LESLIE HARRIS KIRK FITZHUGH LARRY LOVELL CHRISTINE WHITCRAFT Copyright (c) 2020 Zoosymposia 2020-12-28 2020-12-28 19 5–7 5–7 10.11646/zoosymposia.19.1.3