New deep-sea Paratanaoidea (Crustacea: Peracarida: Tanaidacea) from the northeastern Gulf of Mexico

Abstract

One new genus is erected and four new species of paratanaoidean tanaidaceans are described from deep waters in the northeastern Gulf of Mexico: one in each of the genera Collettea, Tanaella, and Pseudomacrinella, and one as a new genus in the family Anarthruridae. Keys to species in the genera Collettea, Tanaella, and the genera of the Anarthruridae are provided.

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

“…Remarks The row of strong serrated spines presents on the cheliped propodus/fixed finger ventral margin in Olokun n. gen. is a unique character among Anarthruridae and similar to unique multiple meral setation of cheliped in Crenicarpus Drumm &Bird, 2016 (Drumm andBird 2016) adds more morphological diversity. Furthermore, this genus can be distinguished from other genera of this family by the combination of: ; -a lateral fold on the cheliped propodus.…”

“…Till this moment, seven species of Collettea were described from the Atlantic Ocean, namely C. bamberi Drumm & Bird 2016, C. cylindrata (Sars, 1882 (Lang, 1971), C. elongata Larsen, 2002, C. minima (Hansen, 1913, C. pegmata Bamber, 2000, C rotundicauda Kudinova-Pasternak, 1983 a n d C . w i l s o n i L a r s e n , 1 9 9 9 ; a n d o n e s p e c i e s (C. vermiformis Lang, 1971) from the Mediterranean Sea.…”

“…In other Atlantic Collettea species, the pleotelson is at least as long as the last three pleonites combined; -a molar with six distinct teeth. Other Atlantic Collettea have molar only with distal serration or spines (Bamber 2000;Drumm and Bird 2016;Hansen 1913;KudinovaPasternak 1983;Lang 1971;Larsen 1999Larsen , 2002Sars 1882); -the fixed finger with two triangular teeth on the cutting edge. Except C. minima, the remaining species have only serration on the cutting edge of the fixed finger (Bamber 2000;Drumm and Bird 2016;Hansen 1913;KudinovaPasternak 1983;Lang 1971;Larsen 1999Larsen , 2002Sars 1882); -elongate uropods, distinctly longer than the half of pleotelson.…”

“…Other Atlantic Collettea have molar only with distal serration or spines (Bamber 2000;Drumm and Bird 2016;Hansen 1913;KudinovaPasternak 1983;Lang 1971;Larsen 1999Larsen , 2002Sars 1882); -the fixed finger with two triangular teeth on the cutting edge. Except C. minima, the remaining species have only serration on the cutting edge of the fixed finger (Bamber 2000;Drumm and Bird 2016;Hansen 1913;KudinovaPasternak 1983;Lang 1971;Larsen 1999Larsen , 2002Sars 1882); -elongate uropods, distinctly longer than the half of pleotelson. Only in C. elongata, uropods are elongate but only close to the half length of pleotelson (Bamber 2000;Drumm and Bird 2016;Hansen 1913;Kudinova-Pasternak 1983;Lang 1971;Larsen 1999Larsen , 2002Sars 1882).…”

“…Except C. minima, the remaining species have only serration on the cutting edge of the fixed finger (Bamber 2000;Drumm and Bird 2016;Hansen 1913;KudinovaPasternak 1983;Lang 1971;Larsen 1999Larsen , 2002Sars 1882); -elongate uropods, distinctly longer than the half of pleotelson. Only in C. elongata, uropods are elongate but only close to the half length of pleotelson (Bamber 2000;Drumm and Bird 2016;Hansen 1913;Kudinova-Pasternak 1983;Lang 1971;Larsen 1999Larsen , 2002Sars 1882).…”