Larsenotanais, Błażewicz-Paszkowycz, 2007

Błażewicz-Paszkowycz, Magdalena, 2007, Figure 6. Typhlotanais Compactus, Female A In Family Nototanaidae Sieg, 1976 And Typhlotanaidae Sieg, 1984, Zootaxa 1598, pp. 1-141 : 41-42

Genus: Larsenotanais gen. n.

Diagnosis (female): Body short, four times as long as wide, all pereonites wider than long, pereonites 1–3 subequal. Antennule slightly longer than carapace; article-1 with about five simple setae along article. Mandible molar with regular tubercles and three spines ventrally. Maxilliped basis with seta longer than endites; endites with two tubercles and one seta distally. Cheliped compact, basis reaching the edge of pereonite-1, carpus three times as long as wide. Pereopods 1–3 basis without acute projection, merus, carpus and propodus without spiniform seta. Pereopods 2 and 3 carpus and propodus with spiniform seta; pereopods 4–6 carpus with moderate prickly tubercles (less than half of carpus length), unguis simple, propodus distal setae shorter than dactylus. Both rami of pleopods with proximal seta separated from others by gap. Uropods rami one-articled, exopod 0.8 times as endopod.

Etymology: Named after Dr Kim Larsen in recognition of his contribution to knowledge of the Tanaidacea .

Type species: Larsenotanais amabilis n. sp.

Gender of generic name: Masculinae.

Species included: Larsenotanais amabilis n. sp.

Remarks: Larsonotanais n. gen. shows a few features in common with members of the ‘ cornutus ’ group (see remarks under that group) sharing a similar body habitus, setation on antennule article-1, mandible ornamentation, proportion of cheliped articles, character of prickly tubercles on pereopods 4–6, and a short distal seta on the propodus of pereopods 4–6. In contrast to members of the ‘ cornutus group' the present species has a simple unguis and uni-articled uropod rami, which preclude it from the ‘ cornutus ’ group.

A short body (less than five times as long as wide) is also characteristic of members of the ‘ eximus ’ group, and species unclassified at the moment— T. solidus Hansen (1913) ( Fig. 80 ). The new species cannot be included to the ‘ eximus ’ group as it has a short antennule. Distinction from T. solidus is impossible at present, as that species is known only from a single specimen (holotype) that is covered by crystals, a condition which precludes detailed observation of its morphology.

Figures

FIGURE 80. Typhlotanais solidus Hansen, 1913, female holotype. Scale = 0.1 mm.