Typhlotanais cornutus, G. O. Sars, 1879

Błażewicz-Paszkowycz, Magdalena, 2007, Figure 6. Typhlotanais Compactus, Female A In Family Nototanaidae Sieg, 1976 And Typhlotanaidae Sieg, 1984, Zootaxa 1598, pp. 1-141 : 126

‘ cornutus ’ group

Diagnosis: Body less than or about five times as long as wide; all pereonites wider than long. Antennule as long as carapace, article-1 with some simple setae. Mandible molar with some blunt, regular teeth. Maxilliped basis with long seta; endites with two seta and two tubercles. Chelae compact (carpus twice as long as wide). Pereopod-1 with simple setae only. Pereopods 2 and 3 with spiniform setae on carpus and propodus; merus and carpus with setae about as long as half of following article. Pereopods 4 and 5 propodus with seta longer than bifurcated unguis. Pleopod proximal seta separated by a gap from the others. Uropod rami two-articled.

Species included: Typhlotanais cornutus G.O. Sars, 1879 ;? T. adipatus sensu Tzareva, 1982 ;? T. crassus Dojiri & Sieg, 1997 , T. andeepae n. sp.

Remarks: The short body (less than five times as long as wide), compact chelae (carpus only twice as long as wide), pereopods 4–6 with distal propodus seta longer than bifurcated unguis and two-articled rami of uropods distinguish members of the ‘ cornutus ’ group from the other typhlotanaids. In the figure by Tzareva (1982, page 53, Fig. 9 ) Typhlotanais adipatus has a simple unguis on pereopod-4 and uni-articled rami of uropods. The material of Tzareva (1982) is not available for study so it cannot be confirmed whether this character was correctly interpreted. However, if those specimens do have a bifurcated unguis on pereopods 4–6 then the species fits comfortably in the ‘ cornutus ’ group.

A stout body (less than five as long as wide) is characteristic also for typhlotanaids such as T. penicillatus G. O. Sars, 1882 , T. spinipes Kudinova-Pasternak, 1982 , and Typhlotanais sp. A (present paper) and T. eximius Hansen, 1913 , but those species have antennules twice as long as the carapace and the distal propodal seta of pereopods 4 and 5 is shorter than the dactylus.

Figures

FIGURE 9. Paratyphlotanais alveolus n. sp., female paratype. A) Antennule; B) Antenna; C) Labrum; D) Left mandible; E) Right mandible; F) Maxillule; F’) Palp; G) Maxilla; H) Labium; I) Maxilliped. Scale = A, B, I = 0.1 mm; C-H = 0.01 mm.