Kotov A.A.1, Stifter P.2 2005. Notes on the genus Ilyocryptus Sars, 1862 (Cladocera: Anmopoda: Ilyocryptidae). 2. A re-evaluation of Ilyocryptus silvaeducensis Romijn, 1919 in Europe and America // Arthropoda Selecta. Vol.14. No.1: 1–10 [in English].

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

2 Smetanova 25, Benбtky nad Jizerou 29471 Czech Republic.

KEY WORDS: Cladocera, Anomopoda, Ilyocryptus, faunistics, systematics, Europe, North America, South America.

ABSTRACT. Ilyocryptus silvaeducensis Rominj, 1919 (Cladocera: Anomopoda: Ilyocryptidae) differs from all other species of the genus in having an especially short preanal margin of postabdomen armed with few (5–8), ordinarily doubled, preanal teeth. We found that Nearctic and Neotropical populations of this species form two discrete subspecies. I. silvaeducensis chengalathi subsp.n., is described from several localities in U.S.A. and Canada. It differs from other subspecies in having a short, stout fifth seta on the anterior portion of valve, a strong spine near the basalmost preanal teeth, and setules on the distal segment of the proximal lateral swimming setae equal in length to the segment diameter. The undescribed Neotropical subspecies of I. silvaeducensis was found in an arid area on the Atlantic coast of Brazil. It differs from other subspecies in possessing several lateral setae at the anal margin, a short distal burrowing spine on the basal segment and thick branches of antenna II. Unfortunately, the sole known specimen was dissected and destroyed, so it is not possible to provide a holotype and establish a new subspecies.

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