Disnyssus, Raven, 2015

Disnyssus View in CoL gen. nov.

Diagnosis. Differs from all other Australian corinnids in having the back eye row straight to recurved ( Fig. 16a View FIGURE 16 , as in the Pacific Melanesotypus gen. nov.) and further from most castianeirines, except Nucastia , in the absence of or strong reduction of spines on tibiae I and II. Differs from the Asian Coenoptychus Simon, 1885 and Aetius O.P.- Cambridge, 1896 in the weakly (versus strongly) recurved posterior eye row and further from Aetius in the presence of a paracymbial spine ( Fig. 38a, d View FIGURE 38 ); males of Coenoptychus are unknown.

Type species: Disnyssus helenmirrenae View in CoL sp. nov.

Species included: Disnyssus helenmirrenae View in CoL sp. nov. and D. judidenchae View in CoL sp. nov.

Etymology. The genus name alludes to the recurved posterior eye row, dis- meaning away, in contrast to that in Nyssus in which it is procurved. The gender is masculine.

Description. Colour: carapace and abdomen dark brown, legs red brown with dark brown bands on femora and patellae. Leg IV much thicker and longer than I ( Fig. 37a, b View FIGURE 37 ). Carapace pear-shaped, steep-sided laterally and posteriorly, wide, teardrop-shaped, flat plateau around fovea; white feathery hairs sparse in wide marginal band and onto dorsal abdomen; fovea short, deep; caput low; indistinct posterior striae; cuticle finely pustulose. Eyes: eight of similar sizes ( Fig. 16a View FIGURE 16 ). Front row within 0.5 diameter of adjacent eye, recurved slightly. Back row 1.5–2 diameters apart, all circular; clearly recurved. Lateral profile of carapace ( Fig. 1b View FIGURE 1 ): low and flat or slightly arched for its length; marginally highest point at fovea; steep posterior declivity; eyes set behind clypeus edge. Retrolateral face of small chelicerae smooth. Chelicerae vertical with large boss; fang relatively short, females with enlarged fang mound setae; promargin with one large tooth flanked by smaller tooth on each side, retromargin with two teeth. Maxillae rhomboidal with long truncate apical ectal edge and basal ental edge, no groove or depression. Labium wider than long. Sternum widely cordate, strong intercoxal triangles, all margins slightly elevated or thickened as in Creugas , wide central depression. Legs: coxal bases with small basal processes anteriorly and larger ones posteriorly; coxae IV about twice as large as I. RCH small, distinct. Femora IV and less so III with distal constriction. Tibiae I and II (male) aspinose. Scopula absent; ventral tarsi sparsely setose. Feathery hairs on all segments but tarsi. Claw tufts dense, high, enclosed claws. Trichobothria: two lines of few on tarsi parted by setal band; one straight sparse (ca. 6) line on retrodorsal metatarsi; 3–4 basally on tibiae. Abdomen with curved dorsal scute (male, Fig. 37a View FIGURE 37 ) for full length of abdomen, ventral scutes ( Fig. 37d View FIGURE 37 ) over genital area with short anterior collar and wide post-epigastric sclerites, main central area enclosing tracheal spiracle cover. Colulus absent. ALS ca. twice size of PLS. Palp: (male) tibia without RTA but deep transverse ventral groove ( Fig. 38a View FIGURE 38 ); cymbium short with narrow margins and short apical cone; dorsoapically with scopula and pallid unsclerotised zone with two pseudoclaw hairs; retrobasally with small lobular paracymbial spine ( Fig. 38a View FIGURE 38 ); bulb large, pyriform basally with broad predistal keel to corkscrew embolus, subtegulum large. Epigyne ( Fig. 38e–h View FIGURE 38 ): paired procurved crescents, narrow CD across to ental edge of large head of spermathecae, with small accessory lobe and narrow distal base before FD.

Distribution. Known only from south-eastern Queensland.