Ancipitilobus, Richardson, Barry J., 2016

Richardson, Barry J., 2016, New genera, new species and redescriptions of Australian jumping spiders (Araneae: Salticidae), Zootaxa 4114 (5), pp. 501-560 : 504-506

Ancipitilobus gen. nov.

Type species: Ancepitilobus howensis sp. nov.

Etymology. The name reflects the presence of a pair (anceps L., ‘two headed’) of ‘lobes’ (lobus L.) on the tegulum and is male in gender.

Diagnosis. Previously all specimens of this genus were placed in Trite concinna as part of the type series of that species. None of the following characteristics of the new genus are seen in Trite : in the female, the spermatheca is anterior to the ducts (compare Figs 12–15 with Figs 226–228 ), there is a very small gland or duct arising on the edge of the spermatheca and the fertilization duct is on the lateral posterior edge of the spermatheca ( Fig. 12 ); the posterior half of the epigyne is covered by a thick sclerotised shield with the copulatory openings passing through the lateral edge of the shield ( Fig. 14 ). In the male, the endites lack the very distinct shapes seen in Trite ( Figs 3 , 217 ), and the palp has a strongly divided and blunt embolus and guide and no proximal lobe on the tegulum ( Fig.10 ).

Description. Small to medium spiders (5 mm) with oval abdomens ( Figs 1–8 ). Males and females have similar general morphology. Cephalothorax mid orange-brown with scattered pennate grey hairs over dorsal surface and sides. Surrounds of ALE, PME and PLE, black with scattered grey hairs. Carapace low and flat. Fovea placed towards the back of the carapace. Clypeus not present in the male. Chelicerae straight, orange-brown. Chelicera have two small promarginal teeth and one, fissident, retromarginal tooth. Endites, sternum and labium light brown. The endites are rounded. Dorsal abdomen light brown with a lacy pattern of darker narrow stripes. Spinnerets brown grading to yellow. Ventral abdomen brown. L1 more robust, brown, and larger in the male. Remaining legs light brown. Leg 4 is longest, followed by leg 1, then leg 3 and finally leg 2. There is no fringing on any leg. The palp is brown ( Figs 9–11 ). The tibia has a single medium-sized broad apophysis, pointed at the tip. The tegulum is oval with a small proximal lobe. The slim tapering embolus, hooked at the end, has an origin on the distal third of the tegulum. There is short independent guide on the distal edge of the tegulum. Externally, the epigyne ( Figs 226– 228 ) has a thick unsclerotised shield that covers the posterior half of the epigyne, with the copulatory openings in the lateral edges of the shield. Simple insemination ducts pass forward and enter the posterior median edges of the spermathecae. There are no glands apparent on the insemination ducts but a gland or diverticulum does arise on the median edge of the simple, rounded, spermatheca. The fertilization duct is on the lateral posterior edge of the spermatheca. The spermatheca is anterior to all the ducts.

Figures

FIGURES 9 – 16. Ancepitilobus howensis sp. nov. 9 – 11 left male palp, holotype (9 prolateral view, 10 ventral view, 11 retrolateral view); 12 – 15 female genitalia, paratype (12 dorsal view, 13 cleared, dorsal view, 14 ventral view, 15 ventral view); 16 map showing similar distributions of Ancepitilobus howensis, Trite grayi and Tara gratiosa comb. nov. Scale: 0.2 mm.

FIGURES 223 – 229. Trite concinna comb. nov. 223 – 225 paralectotype left male palp (223 prolateral view, 224 ventral view, 225 retrolateral view); 226 – 228 female genitalia (226 dorsal view, 227 ventral view, 228 ventral view); 229 map showing known distribution. Scales: palp 0.5 mm, epigyne 0.1 mm.

FIGURES 1 – 8. Ancepitilobus howensis sp. nov. 1 – 4 male holotype (1 dorsal view, 2 lateral view, 3 ventral view, 4 anterior view); 5 – 8 female paratype (5 dorsal view, 6 lateral view, 7 ventral view, 8 anterior view). Scale: male 1 mm, female 2 mm.

FIGURES 215 – 222. Trite concinna comb. nov. 215 – 218 male paralectotype (215 dorsal view, 216 lateral view, 217 ventral view, 218 anterior view); 219 – 222 female lectotype (219 dorsal view, 220 lateral view, 221 ventral view, 222 anterior view). Scale: male 2 mm, female 1 mm.