Kotov A.A.1, Štifter P.2 2005. Notes on the genus Ilyocryptus Sars, 1862 (Cladocera: Anmopoda: Ilyocryptidae). 1. Ilyocryptus plumosus sp.n., a primitive Neotropical member of the I. spinifer-group // Arthropoda Selecta. Vol.13 (for 2004). No.4: 193–198 [in English].

1 A.N. Severtsov Institute of Ecology and Evolution, Leninsky Prospect 33, Moscow 119071 Russia.

2 Smetanova 25, Benátky nad Jizerou 29471 Czech Republic. E-mail: stifter@benatky.cz

ABSTRACT. Ilyocryptus plumosus sp.n., a Neotropical member of I. spinifer-group (Cladocera: Anomopoda: Ilyocryptidae), is described from Venezuela and Nicaragua. The most specific character of I. plumosus sp.n. is the primitive state of the setae at the posterior margin of valves, which lack spine-like setules. This is a rare species, distributed in Central America and northern South America.

KEY WORDS: Cladocera, Anomopoda, Ilyocryptus, morphology, systematics, America, Neotropics.

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