Richness of Dendrocephalus (Branchiopoda, Anostraca) in Brazil with the description of two new species

Abstract

We present an overview of the morphological diversity and geographical distribution of the anostracan genus Dendrocephalus Daday, 1908, and describe two new species: D. aranai sp. nov. from Jequitinhonha in the state of Minas Gerais and D. xikrini sp. nov. from the Carajás Mountains (Serra dos Carajás) in the state of Pará. These species have important similarities to D. goiasensis Rabet & Thiéry, 1996 and D. thieryi Rabet, 2006, respectively, but differ from them and each other through a combination of characters that are essentially unique to the endopods, and frontal appendage branch 2A and branch 2D. We also partly redescribe D. carajaensis Rogers, Gomes & Vieira, 2012, which shows a particular intra-populational variability in branch 2A and 2D III of the frontal appendage, a type of polymorphism that was also recently observed in D. orientalis Rabet & Thiéry, 1996 and which must now be taken into account in taxonomy. In terms of the distribution of species of Dendrocephalus in Brazil, we suggest that several other species are probably present in the Amazonian, Cerrado and Pantanal Biomes, which remain largely unexplored. A new taxonomic key for the identification of males of the Brazilian species is provided.

Desafios e Perspectivas na Conservação da Isoëtes cangae

“…Na Flona de Carajás, observa-se a ocorrência dos Anostraca Dendrocephalus carajaensis (Rogers et al 2012) e dos Dendrocephalus xikrini (Rabet et al 2018), até o momento endêmicas dos ambientes temporários da Serra dos Carajás. Mas D. carajaensis também ocorre no Parque Nacional dos Campos Ferruginosos, na Serra da Bocaina.…”

A review of Dendrocephalus (Dendrocephalinus) (Crustacea: Anostraca) with the first records of male-male anostracan aggressive competition

“…Dendrocephalus s. str. ranges from Argentina, north through to Costa Rica, the Galápagos Islands, and Aruba, with 17 described species (Brendonck et al 1990;Belk et al 2002;Rogers 2013;Rogers et al 2012;Rogers & Volcan 2016;Rabet et al 2018). Rogers & Volcan (2016) provided keys to the species of this subgenus, and improved keys are in development (Rogers et al, in press).…”