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

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.

A new species of Tanaopsis (Crustacea: Tanaidacea) from Japan, with remarks on the functions of serial ridges and grooves on the appendages

“…Including male T. laticaudata (Sars, 1882) sensu Sars (1886), which Lang (1967: p. 350) suggested might have been misidentified as to genus, males have previously been reported in nine congeners, all of which have 14 seven-articulate antennule with three rows of aesthetascs (Sars 1886;Lang 1967;Shiino 1970;Kudinova-Pasternak 1984;Sieg & Dojiri 1991;Bird 2011;Segadilha & Araújo-Silva 2015). To determine whether the six-articulate antennule is restricted to T. japonica, males must be examined from additional species.…”

“…The paratanaoid family Tanaopsidae Błażewicz-Paszkowycz & Bamber, 2012 was established for the genus Tanaopsis Sars, 1899, which at the onset of our study comprised 16 species (Segadilha & Araújo-Silva 2015). Species in Tanaopsidae During a survey of the shallow-water fauna along the coasts of Hokkaido Island, northern Japan, we collected an undescribed tanaopsid species from muddy substrata at three localities (Shinhidaka, Esashi, and Otaru).…”

Pseudotanaidae Sieg, 1976 (Crustacea: Peracarida) from the Southern Ocean: diversity and bathymetric pattern

“…These crustacean brooders were dominated by mobile, morphologically diverse, and often big forms like Amphipoda or Isopoda, while the Tanaidacea, the smaller and more immobile congeners, were represented by only 160 species among 20 families . Three recent publications have supplemented the list of Southern Ocean tanaidaceans by another five species (Esquete et al 2012;Segadilha & Araújo-Silva 2015;Segadilha et al 2017). These 165 species represent just 0.3-0.7% of a predicted number of tanaidacean species (Appeltans et al 2012;Błażewicz-Paszkowycz et al 2012) and is undoubtedly far from complete, with the continental slope and oceanic floor likely hiding more diverse habitats and remaining hardly explored (Pabis et al 2014).…”