Ilyocryptus spinifer Herrick, 1882

Sousa, Francisco Diogo Rocha & Elmoor-Loureiro, Lourdes Maria Abdu, 2019, Identification key for the Brazilian species and subspecies of the family Ilyocryptidae (Crustacea, Branchiopoda, Anomopoda), Papéis Avulsos de Zoologia 59, pp. 1-8 : 7-8

Ilyocryptus spinifer Herrick, 1882

Body sub-ovoid or triangular shaped, dorsal keel well developed, molting incomplete; setae on the posterior margin of valves with inflated base and armed with a long and sharp spine, setulae present; posteriormost setae on the valves armed with setulae. Head triangular shaped, fornices prominent and with a projection in the region of mandibular articulation; spine on the second segment of endopodite of antenna longer than midlength of the third segment. Postabdomen large, preanal part shorter than postanal; marginal denticles of preanal part with regular morphology, relatively long; 16-14 marginal spines of similar length; 3-5 long lateral setae about 4-5 times longer than marginal spines; a long “gap” between proximalmost lateral seta and anal margin; basal spines on the postabdominal claw of different length.

Comments: This is a cosmopolitan species. It is the most commonly found Ilyocryptidae taxon in Brazilian continental waters ( Fig. 3G ). The morphological variation exhibited by this species was described by Elmoor-Loureiro (1997), Kotov & Williams (2000), Kotov & Dumont (2000), and Kotov & Štifter, 2006.

Figures

Figure 3. Geographic distribution Ilyocryptidae Smirnov 1976 emend.Smirnov,1992 taxa of Brazil. (A) Ilyocryptus cuneatus brasiliensis.(B) Ilyocryptus paranaensis inarmatus.(C) Ilyocryptus paranaensis paranaensis.(D) Ilyocryptus plumosus.(E)Ilyocryptus silvaeducensis paraensis.(F) Ilyocryptus sarsi.(G) Ilyocryptus spinifer.