Chydorus eurynotus Sars, 1901

Elmoor-Loureiro, Francisco Diogo R. Sousa Elisângela Reis Rangel Mariana Lessa Carneiro da Silva Ciro Y. Joko Lourdes M. A., 2017, An update for cladoceran fauna (Crustacea, Branchiopoda) from Lake Paranoá, Central Brazil, with the fi rst description of a male of Leydigiopsis ornata Daday, 1905, Nauplius (e 2017029) 25, pp. 1-13 : 11

Chydorus eurynotus Sars, 1901

( Fig. 5E )

Material examined: Six adult parthenogenetic females ( FDRS494 ) .

Remarks: Originally described for the Neotropics, C. eurynotus has been recorded worldwide, suggesting it is a complex of species. It is recognized by rostrum acute and elongated; labral keel convex with apex not projected; postabdomen narrow with distinct postanal angle, 7–11 marginal denticles of which two-three most distal longer than others, postabdominal claw with 5–7 strong spinulae on the proximal pecten. According to Kotov et al. (2013), it is a species with one valid subspecies: C. eurynotus strictomarginatus Paggi, 1972 .

Distribution: presumed Cosmopolitan ( Kotov et al., 2013). In Brazil, it occurs in Amazônica, Tocantins / Araguaia, Paraná, Paraguai, São Francisco, Atlântico Nordeste Ocidental, Nordeste Oriental, Leste, Sudeste and Sul ( Elmoor-Loureiro, 2017).

Figures

Figure 5. Parthenogenetic females from Lake Paranoá: A, Nicsmirnovius sp.; B, Notoalona sculpta; C, Parvalona parva; D, Alonella dadayi; E, Chydorus eurynotus; F, Ephemeroporus tridentatus; G, idem, labral keel; H, idem, posteroventral corner of carapace. Scale bars = 50 µm.