Identification key for the Brazilian species and subspecies of the family Ilyocryptidae (Crustacea, Branchiopoda, Anomopoda) Author Sousa, Francisco Diogo Rocha Author Elmoor-Loureiro, Lourdes Maria Abdu text Papéis Avulsos de Zoologia 2019 2019-05-15 59 1 8 journal article 6037 10.11606/1807-0205/2019.59.23 9209b35f-437f-4238-b4a6-c4d00a2aa10b 1807-0205 4613798 Ilyocryptus sarsi Stingelin, 1913 Ovoid body, dorsal keel present but not developed, molting incomplete; setae on the posterior margin of valves with inflated base and armed with a slender and sharp spine, setulae present. Head triangular, ovoid or semi-ovoid, fornices prominent; postabdomen relatively short, preanal and postanal part of similar length; anal margin short with 6-9 setulae inserted laterally; marginal denticles of preanal part with regular morphology, relatively long; 17-20 marginal spines, of which median ones have similar length; 5-7 lateral setae markedly longer than marginal spines;“gap” between proximalmost lateral seta and anal margin not developed; basal spines on the postabdominal claw of different length. Comments: Ilyocryptus sarsi was treated in Elmoor-Loureiro (1997) as Ilyocryptus sordidus Liévin, 1848 , a species with Palearctic distribution. However, Kotov et al. (2001) found a significant number of differences between these two species. In spite of the low number of records ( Fig. 3F ), Ilyocryptus sarsi has a broad occurrence range in Brazil .