Tanaidacea (Crustacea) of the Northeast Atlantic: non-filiform species of Anarthruridae Lang from the Atlantic Margin

Abstract

Anarthrurid tanaidaceans are common in the bathyal zone west of the British Isles and their identification has been difficult. The complex history of the taxonomy and classification of the Family Anarthruridae Lang is summarised and H.J. Hansen s Leptognathia group d from the Ingolf expeditions is transferred to the Anarthruridae. Three known species are re-described (Anarthrurasimplex, Leptognathia latiremis, and L. glacialis). In addition, five new genera are erected and five new species described. A key to their identification is given. Zoogeographic patterns indicate a cold-water fauna north of the Faeroes and Iceland and a separate Atlantic Deep Sea fauna along the Hebrides-Porcupine-Biscay slope.

New Tanaidacea (Crustacea: Peracarida) from the Gulf of Guinea

“…The swollen basis of pereopods 4-6 was previously recorded e.g. for Synarthrura (Bird 2004) but never to this extent;…”

“…Furthermore, this genus can be distinguished from other genera of this family by the combination of: ; -a lateral fold on the cheliped propodus. This feature is absent in: Acinoproscelos, Anarthrura, Anarthruropsis, Cristatotanais, Ithyomus, Keska, Siphonolabrum, and Thorkelius (Bird 2004(Bird , 2007bBamber and Błażewicz-Paszkowycz 2013;Błażewicz-Paszkowycz et al 2013;Kudinova-Pasternak 1990;Lang 1968Lang , 1972Sars 1882). -the basis of pereopods 4-6 swollen, about 1.5 times as long as wide.…”

“…In Anarthruridae, the dactylus/unguis of pereopods 4-6 is usually short (compared to with this of pereopods 1-3), thus in most genera of this family the propodus of pereopods 4-6 is longer than the dactylus/unguis combined. Ithyomus, Keska, and Siphonolabrum are the only exception -as some of their species have the dactylus/unguis as long as propodus or just longer (Bird 2004;Błażewicz-Paszkowycz et al 2013;Lang 1972); -the uropod endopod two-segmented. A uni-segmented uropod is characteristic for Anisopechys, Synarthrura, and Thorkelius (Bird 2004 Description of female holotype: body (Fig.…”

“…Ithyomus, Keska, and Siphonolabrum are the only exception -as some of their species have the dactylus/unguis as long as propodus or just longer (Bird 2004;Błażewicz-Paszkowycz et al 2013;Lang 1972); -the uropod endopod two-segmented. A uni-segmented uropod is characteristic for Anisopechys, Synarthrura, and Thorkelius (Bird 2004 Description of female holotype: body (Fig. 5A) slender, 8.3 times as long as wide.…”

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

“…An outer series of ridges on the chelae is not uncommon among paratanaoid tanaidaceans, occurring in various families, including Anarthruridae, Akanthophoreidae, Tanaellidae, and Tanaopsidae (e.g., Lang 1967;Sieg 1986;Bird 2004;Błażewicz-Paszkowycz & Bamber 2012). To our knowledge, reasonable functions for these structures have not previously been proposed.…”