Corgosinho P.H.C.1, Martínez Arbizu P.2, Santos-Silva E.N., dos3. 2007. Redescription of Remaneicaris ignotus (Dussart, 1983), a Parastenocarididae (Copepoda: Harpacticoida) with an unusual set of plesiomorphic characters // Invertebrate Zoology. Vol.4. No.1: 31–44 [in English].

1 Plankton Laboratory, CPBA/ INPA, Av. André Araújo, 2936 Petrópolis, CP 478, 69011-970, Manaus-AM, Brazil. E-mail: pcorgo@yahoo.com.br

2 DZMB — Forschungsinstitut Senckenberg, Südstrand 44, 26382 Wilhelmshaven, Germany. E-mail: pmartinez@senckenberg.de

3 Plankton Laboratory, CPBA/ INPA, Av. André Araújo, 2936 Petrópolis, CP 478, 69011-970, Manaus-AM, Brazil. e-mail: nelson@inpa.gov.br

KEY WORDS: Remaneicaris ignotus, Parastenocarididae, South America, groundwater, plesiomorphies.

ABSTRACT: In the course of a phylogenetical analysis of the family Parastenocarididae we re-describe here both sexes of Remaneicaris ignotus (Dussart, 1983) and its phylogenetic position within the genus Remaneicaris is briefly discussed. This species can be distinguished from the other species of the genus by the following autapomorphies: absence of an outer seta on the basis of the leg 1 in both sexes; presence of a very sclerotized body of uneven cuticle; presence of a less sclerotized plate between the fifth legs that is not homologous to an intercoxal plate, and presence of an irregularly-shaped endopod of leg 4 in males, which is hirsute on the proximal outer margin and with a distal hyaline seta. This species also can be easily identified by the presence of several unusual plesiomorphic characters, unknown so far from any other member of the genus, such as a dorsal integumental window on all urosomites, an inner seta on the basis of leg 1 in males and females, the ventral position of leg 5 and the linear distribution of the proximal outer row of spinules on exopodite 1 of legs 2 and 4.

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