Abstract
Presently the inter-generic structure of the Ilyocryptus Sars, 1862 is not clear, and we regard as `sordidus-like' all the species with (1) incomplete moulting, (2) valves without lateral horns or other remarkable structures, (3) non-distal position of anus on postabdomen, (4) long lateral setae on the postabdomen, which reaches the anus; (5) single or doubled teeth on preanal margin of postabdomen. Available material on sordidus-like forms of Ilyocryptus Sars, 1862 (Anomopoda, Branchiopoda) from North America was investigated. We also analyzed a limited amount of material similar to I. sordidus s. str., but not enough to be presented now. Three other conventional species were found and redescribed: the exclusively North American I. gouldeni Williams, 1978, as well as I. cuneatusŠtifter, 1988 and I. spinosusŠtifter, 1988, both described earlier from Europe. An original analysis of the differences between all species was performed. A new sordidus-like species, I. bernerae n. sp., from a single locality in South Carolina, U.S.A., is described. The main diagnostic features of this new species within sordidus-like members of the Ilyocryptusare: thin and sharp dorsal keel; exclusively single preanal teeth, greatly increasing in size in basal direction; lateral setae on postabdomen, not decreasing in size basad; absence of denticles on base of postabdomen; complete absence of any denticles on distal and middle portion of ventral margin of postabdominal claws; distalmost spine on claw base longer than basalmost; bases of antennules compressed against each other (although not touching); slightly different armature of two sides of lateral swimming setae; presence of small hooks on tips of lateral swimming setae; distal segments of setae on trunk of limb I setulated only in basal portion; sensillum on gnathobase II curved.
Similar content being viewed by others
References
Alonso, M., 1996. Fauna Iberica. Crustacea Branchiopoda. Mus. Nac. Cien. Natur. Consejo Superior de Investigaciones Cientificas, Madrid: 486 pp.
Birge, E. A., 1892. List of Crustacea from Madison, Wisconsin. Trans. Wis. acad. Sci. Arts Lett. 8: 379–398.
Birge, E. A., 1918. The water fleas (Cladocera). In Ward, H. B. & G. Ch. Whipple (eds), Freshwater Biology. Wiley, New York: 676–740.
Brooks, J. L., 1959. Cladocera. In Edmondson, W. T. (ed.), Freshwater Biology. Wiley, New York: 587–656.
Chengalath, R., 1987. Synopsis Speciorum. Crustacea: Branchiopoda. Bibliographia Invertebratorum Aquaticorum Canadensium 7. Nat. Mus. Nat. Sci.& Nat. Mus. Canada, Ottawa: 119 pp.
Chiang Sieh-chin & Du Nan-shan, 1979. Freshwater Cladocera. Crustacea. Fauna Sinica. Science Press, Academia Sinica, Peking: 297 pp. (in Chinese).
Ciros-Pérez, J. & M. Elías-Gutiérrez, 1997. Macrothrix smirnovi, a new species (Crustacea: Anomopoda: Macrothricidae) from Mexico, a member of the M. triserialis-group. Proc. Biol. Soc. Wash. 110: 115–127.
Ciros-Pérez J., M. Silva-Briano & M. Elías-Gutiérrez, 1996. A new species of Macrothrix (Anomopoda: Macrothricidae) from Central Mexico. Hydrobiologia 319: 159–166.
Elías-Gutiérrez M. & N. N. Smirnov, 2000. Macrothrix marthae, a new (Crustacea: Anomopoda: Macrothricidae), a highly specialized macrothricid from Mexico. Proc. Biol. Soc. Wash. 113: 652–660.
Frey, D. G., 1988. Separation of Pleuroxus laevis Sars, 1861 from two species in North America: Pleuroxus straminius Birge, 1879 and Pleuroxus chiangi n.sp. (Cladocera, Chydoridae). Can. J. Zool. 66: 2534–2563.
Goulden, C. E., 1968. The systematics and evolution of the Moinidae. Trans. amer. Phil. Soc., n. ser. 58: 1–101.
Hann, B. J., 1982. Two new species of Eurycercus (Bullatifrons) from Eastern North America (Chydoridae, Cladocera). Taxonomy, ontogeny, and biology. Int. Rev. ges. Hydrobiol. 67: 585–610.
Hebert, P. D. N. & T. L. Finston, 1997. A taxonomic reevaluation of North American Daphnia (Crustacea: Cladocera).III. The D. catawba complex. Can. J. Zool. 75: 1254–1261.
Herrick, C. L., 1882a. Notes on some Minnesota Cladocera. Geol. nat. Hist. Surv. Minn., 10th ann. rep.: 235–252.
Herrick, C. L., 1882b. Mud-inhabiting Crustacea. Bull. Lab. Denison Univ.: 37–42.
Herrick, C. L., 1884. A final report on the Crustacea of Minnesota. Geol. nat. Hist. Surv. Minn., 12th ann. rep.: 1–191.
Kořínek, V. & P. D. N. Hebert, 1996. A new species complex of Daphnia (Crustacea, Cladocera) from the Pacific northwest of the United States. Can. J. Zool. 74: 1379–1393.
Kotov, A. A., 1996. Frontalnaja golovnaja pora u primitivnih predstaviteley semeistv Chydoridae i Macrothricidae. Zool. Zhurnal 75: 1603–1607 (frontal head pore in primitive representatives of families Chydoridae and Macrothricidae (Anomopoda, Crustacea) (in Russian).
Kotov, A. A., 1999. Morphology and variability of Ilyocryptus agilis Kurz, 1878 and Ilyocryptus cf. cuneatus Štifter, 1988 from Lake Glubokoe, Moscow Area, central Russia (Branchiopoda: Anomopoda). Arthropoda Selecta 8(1): 3–22.
Kotov, A. A., 2000. Redescription of Ilyocryptus tuberculatus Brehm, 1913 (Anomopoda, Branchiopoda). Hydrobiologia 428: 115–128.
Kotov, A. A. & H. J. Dumont, 2000. Analysis of the Ilyocryptus spinifer s. lat. species group (Anomopoda, Branchiopoda), with description of a new species. Hydrobiologia 428: 85–113.
Kotov, A. A. & B. V. Timms, 1998. Ilyocryptus smirnovi n. sp. (Branchiopoda, Anomopoda) – a new member of the species group Ilyocryptus brevidentatus s.lat. from Australia. Hydrobiologia 380: 127–139.
Kotov, A. A. & J. L. Williams, 2000. Ilyocryptus spinifer Herrick 1882 (Anomopoda, Branchiopoda): a redescription based on North American material and designation of a neotype from Minnesota. Hydrobiologia 428: 67–84.
Kotov A. A., H. J. Dumont & K. Van Damme, 2001. Redescription of Ilyocryptus sarsi Stingelin, 1913. Hydrobiologia 472: 207–222.
Pennak, R. W., 1978. Freshwater invertebrates of the United States. 2nd edn., Wiley, N.Y.: 803 pp.
Pielou, E. C., 1979. Biogeography. Wiley, N.Y.: 351 pp.
Sars, G. O., 1901. Contributions to the knowledge of the fresh-water Entomostraca of South America, as shown by artificial hatching from dried material. 1. Cladocera. Arch. Math. Naturv. 23: 1–102.
Sars, G. O., 1916. The fresh-water Entomostraca of the Cape Province (Union of South Africa). Part 1: Cladocera. Ann. S. Afr. Mus. 15: 303–351.
Silva-Briano, M., 1999. Redescription of Macrothrix laticornis (Jurine, 1820), and description of two new species of the M. laticornis-group. Hydrobiologia 403: 39–61.
Smirnov, N. N., 1974. Chydoridae. Fauna of the USSR. Crustacea 1(2). Keter Publishing House, Jerusalem, 531 pp.
Smirnov, N. N., 1976. Macrothricidae i Moinidae fauni mira. Fauna SSSR. Rakoobraznie 1 (3): 1–237 (Macrothricidae and Moinidae of the world. In Russian).
Štifter, P., 1988. Two new species of the genus Ilyocryptus (Cladocera, Crustacea) confused with I. sordidus Liévin. Vést. česk. Společ. zool. 52: 290–301.
štifter, P., 1991. A review of the genus Ilyocryptus (Crustacea: Anomopoda) from Europe. Hydrobiologia 225: 1–8.
Williams, J. L., 1978. Ilyocryptus gouldeni, a new species of water flea, and the first American record of I. agilis Kurz (Crustacea: Cladocera: Macrothricidae). Proc. Biol. Soc.Wash. 91: 666–680.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kotov, A.A., Elías-Gutiérrez, M. & Williams, J.L. A preliminary revision of sordidus-like species of Ilyocryptus Sars, 1862 (Anomopoda, Branchiopoda) in North America, with description of I. bernerae n. sp.. Hydrobiologia 472, 141–176 (2002). https://doi.org/10.1023/A:1016364724810
Issue Date:
DOI: https://doi.org/10.1023/A:1016364724810