Zootaxa

**Neotropical species of Elpidium F. Müller, 1880 (Crustacea: Ostracoda) introduced into New Caledonia (Melanesia, Pacific Ocean) through ornamental bromeliad trade**

Mon, 22 Jun 2026 00:00:00 +1200

The ostracod genus Elpidium is known so far for South and Insular America and all of its 20 known species are confined to phytotelmata, mostly in tank-bromeliads. These plants, with more than 1200 species in the Atlantic Forest along the eastern shores of Brazil, can be either terrestrial or epiphytic, and occur along a vast altitudinal gradient. In recent decades, an international, even intercontinental, trade in ornamental bromeliads has expanded. These plants can be transported over large distances, and in some cases contain “passenger” taxa in their tanks, mostly insects and crustaceans. Here, we report on the discovery of two species of Elpidium from bromeliad phytotelmata in New Caledonia (Melanesia, Pacific Ocean). By coincidence, the same two species had also recently been collected from their presumed native area, one from Insular America (Dominican Republic and US Virgin Islands) and one from South America (Itapeva park in southern Brazil). These two species, Elpidium alarconi Mesquita-Joanes et al., 2025 and Elpidium itapevaense sp. nov., are here reported and (re-) described. Morphological comparisons with the populations from New Caledonia are provided.

**Redescription of the coral reef inhabiting axiidean shrimp Parascytoleptus tridens (Rathbun, 1906) (Decapoda: Calocarididae), and description of a new species from the south-western Indian Ocean**

TOMOYUKI KOMAI, ARTHUR ANKER — Mon, 22 Jun 2026 00:00:00 +1200

The calocaridid shrimp genus Parascytoleptus Sakai & de Saint Laurent, 1989 was hitherto represented by two species, P. tridens (Rathbun, 1906), the type species, and P. papua Poore & Collins, 2010. Parascytoleptus tridens (Rathbun, 1906) was seen as a widespread Indo-West Pacific species, inhabiting shallow and moderately deep coral reefs. However, morphological comparisons and genetic analyses using two mitochondrial markers (COI and 16S rRNA genes) of material from various Indo-West Pacific localities revealed the presence of an undescribed species in the south-western Indian Ocean. In the present study, P. tridens is redescribed based on material from Hawaii, including the holotype, as well as specimens from French Polynesia and eastern Australia, whereas P. cognatus sp. nov. is described based on specimens from Nosy Iranja in the vicinity of Nosy Bé, Madagascar, and Réunion. The new species is characterised by the less developed rostrum, less pronounced lateral spines of the telson in the female, the proportionally wider cheliped meri, and the more extensive brownish markings on the cheliped palm and fingers. All three species of Parascytoleptus exhibit a strong sexual dimorphism in several morphological characters, including the shape of the carapace and its frontal region, size of the pleon, and proportions of the chelipeds.

Annotated catalogue and type designations of the family Delphacidae (Hemiptera: Auchenorrhyncha: Fulgoromorpha) in Hokkaido University, Japan

JAEKOOK PARK, SATOSHI FUJINUMA, MASAMI HAYASHI, SUNGHOON JUNG — Mon, 22 Jun 2026 00:00:00 +1200

The type specimens of the family Delphacidae in the Matsumura Collection deposited in the Systematic Entomology, Hokkaido University, Japan (SEHU) were examined, and a corresponding catalogue is compiled with label information for each species. Lectotypes are newly designated for 50 species from 20 genera based on a comparison and review of the original descriptions.

**Morphology of Ceriodaphnia rotunda (Straus, 1820) and C. laticaudata P.E. Müller, 1867 (Cladocera: Daphniidae) with comments on the importance of limb II characters for the genus taxonomy**

Mon, 22 Jun 2026 00:00:00 +1200

Representatives of the genus Ceriodaphnia Dana, 1853 (Cladocera: Daphniidae) are widely distributed worldwide, they are very common in the plankton of many freshwater bodies of different types in temperate and tropical latitudes. However, their taxonomy remains intricate, especially as compared to the genus Daphnia O.F. Müller, 1785. The aim of this study is to redescribe the morphology of Eurasian taxa having a specific (high and triangular) postabdomen, namely C. rotunda (Straus, 1820) and C. laticaudata P.E. Müller, 1867 and list the differences between these two taxa. A population from Republic of Sakha (Yakutia, Asian Russia) is identified as C. cf. laticaudata, and its exact taxonomic status could not be resolved to date due to a limited material and absence of gamogenetic specimens in our collection. Also, we analyse the morphological characters used for identification of common Eurasian taxa with special attention to limb II. All Ceriodaphnia species could be subdivided into four groups according to the size of anterior setae on the inner-distal portion of limb II: the pulchella-group with a single rudimentary seta on endite 4 and no seta on endite 3, the quadrangula group with short setae on endites 3 and 4, the dubia-turkestanica-reticulata-nikolaii group with a single very large seta on endite 4 and a shorter seta on endite 3, and the rotunda-laticaudata group with large setae on endites 4 and 3. Four aforementioned groups could be formed according to ecological preferences rather than their phylogenetic position. A further step-by-step revision of Ceriodaphnia is needed based on morphological and full-genome data for adequate understanding of the genus diversity.

**Two new species of the genus Tiwaripotamon Bott, 1970 (Crustacea, Decapoda, Brachyura, Potamidae) from Guangxi, China**

YUXIN CHEN, HONGYING SUN, DA PAN — Mon, 22 Jun 2026 00:00:00 +1200

Two new species of semiterrestrial freshwater crabs, Tiwaripotamon laibinense sp. nov. and Tiwaripotamon liuzhouense sp. nov., are described from karst landscapes in Guangxi, China. These crabs are characterized by their relatively long and slender ambulatory legs, an adaptation commonly associated with a semiterrestrial lifestyle. Both species are distinguished from their congeners by a combination of characters, notably the structure of the male first gonopod and features of the carapace. Estimates of Kimura two-parameter distances based on mitochondrial COI sequences support the recognition of the two new species. With these additions, the number of Tiwaripotamon species known from China increases to six, further highlighting the karst regions of southern China as a hotspot of freshwater crab diversity.

**Description of two new Chinese Parvispinia and new collection data for P. barkama (Lepidoptera, Noctuidae)**

Mon, 22 Jun 2026 00:00:00 +1200

Two new Chinese species of the genus Parvispinia Babics, Kononenko & Saldaitis, 2012 are described: P. clavata sp. nov. collected from Xizang, and P. dellabrunnai sp. nov. from Gansu. Both are compared with all other known species. Additionally, a second known collection locality in Xizang, 800 km west of the type locality in northern Sichuan, is reported for P. barkama Babics, Kononenko & Saldaitis, 2012; identification is confirmed by the genitalia of both sexes. All known collection localities for the Parvispinia species are mapped.

**A new species of Oxyporus Fabricius (Coleoptera: Staphylinidae: Oxyporinae) from western Mexico and new record from Aguascalientes for O. mexicanus Fauvel**

JOSÉ L. NAVARRETE-HEREDIA, JOSÉ L. REYES-HERNÁNDEZ — Mon, 22 Jun 2026 00:00:00 +1200

A new species, Oxyporus amigo, is described from Jalisco and Michoacán, Mexico. The new species is diagnosed and illustrated. Additionally, Oxyporus mexicanus Fauvel, 1865 is recorded for the first time from the state of Aguascalientes, based on specimens collected in Monte Grande, San José de Gracia.

**First records of the genera Aniseres Förster, 1871 and Pantisarthrus Förster, 1871 (Hymenoptera, Ichneumonidae, Orthocentrinae) from the Oriental region**

OLEKSANDR VARGA — Mon, 22 Jun 2026 00:00:00 +1200

In this paper, two orthocentrine genera, Aniseres Förster, 1871 and Pantisarthrus Förster, 1871, are recorded from the Oriental region for the first time. Three new species are described from Vietnam: A. brevicauda sp. nov., A. vietnamensis sp. nov., and P. orientalis sp. nov.

**A new species of the Cephennodes taurus group in Yaeyama Islands, Japan (Coleoptera: Staphylinidae: Scydmaeninae)**

PAWEŁ JAŁOSZYŃSKI — Mon, 22 Jun 2026 00:00:00 +1200

Cephennodes (s. str.) pseudoakane sp. nov. is described, based on specimens collected in Ishigaki-jima and Iriomote-jima islands (Yaeyama Islands of the Ryukyus), Okinawa Prefecture, Japan. The new species belongs to the C. taurus group, so far represented by 14 species distributed in Japan, China, Taiwan and Vietnam. Three species of this group occur in the close vicinity of C. pseudoakane—C. akane Hoshina, 2020 (Taiwan), C. maya Hoshina, 2021 (Taiwan), and C. yume Hoshina, 2017 (Okinawa Island). Characters of these four highly similar species are illustrated and compared, including unique modifications of the frontal region in males. Key to males of all species belonging to the C. taurus group is given.

**A new species of the genus Syntomernus (Hymenoptera: Braconidae, Braconinae) parasitizing cynipid gall wasps from China**

CHUAN-XI ZHANG — Mon, 22 Jun 2026 00:00:00 +1200

This study describes Syntomernus ningbonensis sp. nov. (Hymenoptera: Braconidae, Braconinae), a new species of Braconinae reported from China. This parasitoid wasp attacks cynipid gall wasps (Cynipidae) on Rosa multiflora leaves. Adult wasps emerge from host galls between late July and early October, with typically 3–5 conspecific adults emerging from a single gall. Phylogenetic relationships between the new species and S. flavus Morley, as well as other known Syntomernus species were inferred using partial mitochondrial cytochrome c oxidase subunit I (COI) gene sequences. Additionally, a new combination is proposed: S. garugaphagae (Ranjith & Quicke, 2016), comb. nov.

**Notes on the identity of the orb-weaver spider Araneus nox Simon, 1877 (Araneae: Araneidae) from India, including its transfer to Eriovixia Archer, 1951 and one new synonymy**

MATHEW M. JOSEPH, ASHWIN G., JAYADEVAN C. SHENOY — Mon, 22 Jun 2026 00:00:00 +1200

**The tadpole of Boana guarinimirim Marinho, Bang, Vidigal, and Giaretta, 2022 (Hylidae, Cophomantini)**

MARIANA VAINI, PEDRO MARINHO, KATYUSCIA ARAUJO-VIEIRA, CÉLIO F. B. HADDAD — Mon, 22 Jun 2026 00:00:00 +1200