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

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gen. nov.

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 12–15View FIGURES 9 – 16 with Figs 226–228View FIGURES 223 – 229), 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. 12View FIGURES 9 – 16); 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. 14View FIGURES 9 – 16). In the male, the endites lack the very distinct shapes seen in Trite  ( Figs 3View FIGURES 1 – 8, 217View FIGURES 215 – 222), and the palp has a strongly divided and blunt embolus and guide and no proximal lobe on the tegulum ( Fig. 10View FIGURES 9 – 16).

Description. Small to medium spiders (5 mm) with oval abdomens ( Figs 1–8View FIGURES 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. L 1 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 9–11View FIGURES 9 – 16). 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– 228View FIGURES 223 – 229) 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.