Two new species of Tanaopsis (Tanaidacea: Tanaopsidae) from Admiralty Bay (Antarctica), with an identification key

Juliana L Segadilha,Catarina L Araújo-Silva

doi:10.1590/s0104-64972015002315

Abstract

Two new species of family Tanaopsidae, genus Tanaopsis, from Admiralty Bay (Antarctica) are herein described. Tanaopsis brevicorpus sp. nov. displays antennule article 1 about 1.5 times as long as wide, carapace as long as first three pereonites, both rami of uropod biarticulate with fusion line, and pleotelson short, more than twice longer than wide. Tanaopsis bamberi sp. nov. resembles other Antarctic species T. kerguelenensis in its habitus, antennule long and uropod uniarticulate. However, the new species can be distinguished from it by a combination of characters that includes maxilliped basis with long seta arising from tubercles; inner margin of cheliped fixed finger with three smooth sub-terminal spines; uropod subequal to pleotelson in length, and uropodal endopod about twice as long as exopod.

Highlights

The monotypic family Tanaopsidae BłażewiczPaszkowycz and Bamber, 2012 is characterized mainly by the pleon being laterally convex and wider than pereon, and the cheliped fixed finger having a bifid terminal spine
The Paratanaoidea phylogeny performed by Larsen and Wilson (2002), and revised by Bird and Larsen (2009), placed Tanaopsis as genus incertae sedis mainly due to the cheliped fixed finger with bifid terminal spine and coxa of pereopod-1 with a developed spur, which do not allow its inclusion in other family (Błażewicz-Paszkowycz and Bamber, 2012)
Tanaopsis laticaudatus (Sars, 1882) would fit in the first group as it has two segmented uropod rami, it is described as being without a mandibular molar (Sars, 1899; Błażewicz-Paszkowycz and Bamber, 2012)

Summary

Introduction

The monotypic family Tanaopsidae BłażewiczPaszkowycz and Bamber, 2012 is characterized mainly by the pleon being laterally convex and wider than pereon, and the cheliped fixed finger having a bifid terminal spine. Article 5 about 3.5 times as long as wide, longer than article 2, with one distal simple seta.

Results

Conclusion