Nicsmirnovius sp.

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 : 9

Nicsmirnovius sp.

( Fig. 5A )

Material examined: One adult parthenogenetic female ( FDRS490 ) .

Remarks: From the Neotropics, the genus has two members: Nicsmirnovius incredibilis Smirnov, 1984 endemic from Amazonia ( Kotov, 2003) and Nicsmirnovius fitzpatricki (Chien, 1970) which is distributed from Florida ( USA) to Argentina. Comparison between specimens of N. fitzpatricki from South America and those from the type-region ( USA) revealed morphological differences, leading Van Damme et al. (2003) to suggest a possible speciescomplex. The morphology of the specimen from Lake Paranoá did not fit any of the species already described, showing that they constitute a new species ( Sousa and Elmoor-Loureiro, 2017). Nicsmirnovius sp. is recognized by three connected median head pores, cosmaria sacs underneath the lateral pores, IDL of the first pair of limbs with a chitinized hook seta, postanal portion of postabdomen wide and quadrangular.

Distribution: Preliminary data indicated that Nicsmirnovius sp. does not occur in median and lower portions of the Amazon Basin. Nicsmirnovius sp. has no geographic distribution overlap with N. incredibilis . A wide distribution in the Neotropics is expected.

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.