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A new genus and species of entocytherid ostracod (Ostracoda: Entocytheridae) from the John Day River Basin of Oregon, U.S.A., with a key to genera of the subfamily Entocytherinae



Targeted sampling efforts by the authors for the signal crayfish, Pacifastacus leniusculus, from its native range in the John Day River Basin, Oregon, U.S.A. yielded entocytherid ostracods with a male copulatory complex so clearly different from other entocytherines that a new genus, Aurumcythere gen. nov. is proposed to receive them. This newly proposed, apparently nonsclerotized, genus with hook and spur-like prominences of the posteroventral end of the peniferum is the first new genus of the subfamily Entocytherinae named since Hobbs & Peters described Aphelocythere (= Waltoncythere) in 1977. Aurumcythere gen. nov. represents only the second genus of entocytherid known from the Pacific Northwest. Lack of sclerotization in Aurumcythere gen. nov. provides new insight into poorly understood mating behaviors of entocytherid ostracods.



Crustacea, Entocytheridae, crayfish symbiont, new genus, Pacifastacus leniusculus, mating behavior

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Abe, K. & Vanier, J. (1991) Mating behavior in the podocopid ostracode Bicornucythere bisanensis (Okubo, 1975): rotation of a female by a male with asymmetric fifth limbs. Journal of Crustacean Biology, 11, 250–260.

Aguilar-Alberola, J.A., Mesquita-Joanes, F., López, S., Mestre, A., Casanova, J.C., Rueda, J. & Ribas, A. (2012) An invaded invader: high prevalence of entocytherid ostracods on the red swamp crayfish Procambarus clarkii (Girard, 1852) in the Eastern Iberian Peninsula. Hydrobiologia, 688, 63–73.

Dana, J.D. (1852) Conspectus Crustaceorum, etc. Conspectus of the Crustacea of the Exploring Expedition under Capt Wilkes, U.S.N., including the Crustacea Cancroidea Corystoidea. Proceedings of the Academy of Natural Sciences of Philadelphia, 6, 73–86.

Danielopol, D.L. (1977) Recherches sur les Ostracodes Entocytheridae. Donées sur Sphaeromicola cebennica juberthiei nov. ssp. et Sphaeromicola cirolianae Rioja. International Journal of Speleology, 9, 21–41.

Dobbin, C.E. (1941) Fresh-water ostracoda from Washington and other western localities. University of Washington Publications, Biology, 4, 174–246.

Hart, C.W. Jr. (1962) A revision of the ostracods of the family Entocytheridae. Proceedings of the Academy of Natural Sciences of Philadelphia, 114 (3), 121–147.

Hart, C.W. Jr. (1965) Three new entocytherird ostracods from the Western United States with new locality data for two previously described western entocytherids. Crustaceana, 8 (2), 190–196.

Hart, C.W. Jr. & Hart, D.G. (1967) The entocytherid ostracods of Australia. Proceedings of the Academy of Natural Sciences of Philadelphia, 119, 1–51.

Hart, C.W. Jr., Nair, N.B. & Hart, D.G. (1967) A new ostracod (Ostracoda, Entocytheridae) commensal on a wood boring marine isopod from India. Notulae Naturae of the Academy of Natural Sciences of Philadelphia, 409, 1–11.

Hart, D.G. & Hart, C.W. Jr. (1974) The Ostracod family Entocytheridae. Academy of Natural Sciences of Philadelphia Monograph, 18, 1–239.

Hobbs, H.H. Jr. (1971) The entocytherid ostracods from Mexico and Cuba. Smithsonian Contributions to Zoology, 81, 1–55.

Hobbs, H.H. Jr. & Peters, D.J. (1977) The entocytherid ostracods of North Carolina. Smithsonian Contributions to Zoology, 247, 1–77.

Hobbs, H.H. Jr. & Walton, M. (1975) New entocytherid ostracods from Tennessee with a key to species of the genus Ascetocythere. Proceedings of the Biological Society of Washington, 88, 5–20.

Hoff, C.C. (1942) The subfamily Entocytherinae, a new subfamily of fresh-water Cytherid Ostracoda, with descriptions of two new species of the genus Entocythere. American Midland Naturalist, 27, 63–73.

Hoff, C.C. (1943) Two new ostracods of the genus Entocythere and records of previously described species. Journal of the Washington Academy of Sciences, 33 (9), 276–286.

Huys, R., Oidtmann, B., Pond, M., Goodman, H. & Clark, P.F. (2014) Invasive crayfish and their symbionts in the Greater London area: new data and the fate of Astacus leptodactylus in the Serpentine and Long Water Lakes. Ethology Ecology & Evolution, 26 (2–3), 320–347.

Klie, W. (1938) Sphaeromicola dudichi n. sp. (Ostr.) ein kommensale des Bohramphipoden Chelura terebrans. Zoologischer Anzieger, 121 (11–12), 317–322.

Kozloff, E.N. (1955) Two new species of Entocythere (Ostracoda, Cytheridae) commensal on Pacifastacus gambelii (Girard). American Midland Naturalist, 53 (1), 156–161.

Kozloff, E.N. & Whitman, D.C. (1954) Entocythere occidentalis sp. nov., a cytherid ostracod commensal on western species of Pacifastacus. American Midland Naturalist, 52 (1), 159–163.

Larson, E.R., Abbott, C.L., Usio, N., Azuma, N., Wood, K.A., Herborg, L.-M. & Olden, J.D. (2012) The signal crayfish is not a single species: cryptic diversity and invasions in the Pacific Northwest range of Pacifastacus leniusculus. Freshwater Biology, 57, 1823–1838.

Marshall, W.S. (1903) Entocythere cambaria (nov. gen. et nov. spec.), a parasitic ostracod. Transactions of the Wisconsin Academy of Sciences, Arts, and Letters, 14 (1), 117–144.

Mestre, A., Aguilar-Alberola J.A., Baldry, D., Balkis, H., Ellis, A., Gil-Delgado, J.A., Grabow, K., Klobucar, G., Kouba, A., Maguire, I., Martens, A., Mulayim, A., Rueda, J., Scharf, B., Soes, M., Monrós, J.S. & Mesquita-Joanes, F. (2013) Invasion biology in non-free-living species: interactions between abiotic (climatic) and biotic (host availability) factors in geographical space in crayfish commensals (Ostracoda, Entocytheridae). Ecology and Evolution, 3 (16), 5237–5253.

Mestre, A., Mesquita-Joanes, F. & Monrós, J.S. (2014) A review of the Entocytheridae (Ostracoda) of the world: updated bibliographic and species checklists and global georeferenced database, with insights into host specificity and latitudinal patterns of species richness. Crustaceana, 87, 923–951.

Paris, P. (1916) Sphaeromicola topsenti n. g. n. sp., Ostracode commensal d’isopodes troglobies du genre Caecosphaeroma, Comptes Rendus Hebdomadaires des Seances de l’Academie des Sciences, Paris, 163, 307–309.

Rioja, E. (1943a) Estudios carcinológicos 15, Polimorfismo femenimo de los Ostracodos del género Entocythere. Anales del Instituto de Biologia, 14 (2), 567–585.

Rioja, E. (1943b) Nuevos datos acerca de los Entocythere (Crus. Ostracodos) de Mexico. Anales del Instituto de Biologia, 14 (2), 553–566.

Rioja, E. (1951) Estudios carcinológicos XXV. El hallazgo del genero Sphaeromicola en America (Ostracodos, Citeridos) y descripcion de una nueva especie. Anales del Instituto de Biologia, xico, 22 (1), 169–179.

Smith, R.J. & Kamiya, T. (2001) The first record of an entocytherid ostracod (Crustacea: Cytheroidea) from Japan. Benthos Research, 56 (2), 57–61.

Weaver, P.G. & Williams, B.W. (2016) Observations of false mating behavior in entocytherid ostracods from the northwestern United States. Invertebrate Biology, 135 (3), 252–258.

Westervelt, C.A. Jr. & Kozloff, E.N. (1959) Entocythere neglecta sp. nov., a cytherid ostracod commensal on Pacifastacus nigrescens (Stimpson). American Midland Naturalist, 6 (1), 239–244.



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