Peraeospinosus Sieg, 1986

Błażewicz-Paszkowycz, Magdalena, 2007, Figure 6. Typhlotanais Compactus, Female A In Family Nototanaidae Sieg, 1976 And Typhlotanaidae Sieg, 1984, Zootaxa 1598, pp. 1-141 : 46

Genus Peraeospinosus Sieg, 1986

Diagnosis (after Błażewicz-Paszkowycz, 2005): Body robust, elongate, usually 6–10 times as long as wide; pereonites 1–5 with collar-like grooves, usually anteriorly or posteriorly. Carapace oval or rounded, rarely narrow, rostrum well-developed. Dorsal margin of cheliped carpus with row of minute setae. Labrum hoodshaped, with upper part covered with needle-like setae. Molar process with row of spines on lower margin. Maxillule with nine spiniform setae distally, two semi-fused. Labium external lobes with row of minute setae on edges. Maxilliped bases wide, heart-shaped, endites with two small flat setae (tubercles) on distal margins. Epignath sharply tipped, often bifurcated. Distal seta on propodus of pereopods 4 and 5 longer than unguis; prickly tubercles on pereopods 4–6 surrounded by blunt, calcified spines; unguis of pereopods 4–6 bifurcated. Exopod of pleopods semi-elliptical. Uropod rami usually uni-articled, equal or subequal. Uropod exopod tipped by diminutive and robust seta (at basis almost as wide as exopod).

Male: Terminal/swimming type.

Gender of generic name: Masculine.

Type species: Typhlotanais kerguelenensis Beddard, 1886 .

Species included: Peraeospinosus brachyurus ( Beddard, 1886) ; Peraeospinosus emergensis Błażewicz- Paszkowycz, 2005; P. exiliremis Błażewicz-Paszkowycz, 2005 ; P. kerguelenensis ; P. magnificus (Kudinova- Pasternak, 1969); P. magnus ( Kudinova-Pasternak, 1990) ; P. peculiaris ( Lang, 1968) , P. peculiaroides Błażewicz-Paszkowycz, 2005 ; P. pushkini ( Tzareva, 1982) ; P. rectus ( Kudinova-Pasternak, 1968) ; P. subtigaleatus Błażewicz-Paszkowycz, 2005 ; P. acruxi n. sp.

Remarks: Peraeopsinosus brachyurus ( Beddard,1886) , originally placeded in Typhlotanais , is transferred to the genus Peraeopsinosus. The type specimens are mounted in Canada Balsam, precluding detailed analysis, but the subequal rami of the uropods, the long setae on the propodus of pereopods 4 and 5 and the minute setae on the cheliped carpus support the reallocation. The species has a long seta on the propodus of pereopod-6.

Based on the definition of Peraeospinosus by Błażewicz-Paszkowycz (2005), three species previously included in this genus are now excluded. Typhlotanais adipatus Tzareva, 1982 (originally described in Typhlotanais and included to Peraeospinosus by Sieg, 1986 a) and Typhlotanais angusticheles (Kudinova- Pasternak, 1987) (originally described in Peraeospinosus ) are transferred to Typhlotanais sensu lato. The third species, Typhlotanais (= Peraeospinosus ) mixtus Hansen, 1913 , probably represents a new genus of Typhlotanaidae (see remarks page 108). As a result, Peraeospinosus currently includes twelve species.