Serratacosa, Wang & Peng & Zhang, 2021

Wang, Lu-Yu, Peng, Xian-Jin & Zhang, Zhi-Sheng, 2021, Serratacosa, a new genus of Lycosidae (Araneae) from the southern slopes of the Eastern Himalayas, European Journal of Taxonomy 762, pp. 99-107 : 98-99

Serratacosa gen. nov.

urn:lsid:zoobank.org:act:DE9ED7B2-DB01-4C4B-8C29-6DE34846FFF7

Type species

Serratacosa medogensis gen. et sp. nov.

Diagnosis

This new genus shares similar characters with some Lycosinae genera, such as Costacosa Framenau & Leung, 2013 (male pedipalps with serrated median apophysis), Hogna Simon, 1885 and Trochosa C. L. Koch, 1847 (epigynes with inverted T-shaped septum). However, the new genus can be distinguished from all above mentioned genera by: median apophysis ventral surface with a semicircular protruding lobe, strongly sclerotized, dorsal surface with an oval sclerite (with keel-shaped ventral spur in Costacosa , whereas in Hogna and Trochosa oblique, with stout spur near base); terminal apophysis twisted, strongly grooved (sickle-shaped in Costacosa , Hogna and Trochosa ); embolus long, sinuous (arc-shaped in Costacosa , Hogna and Trochosa ) ( Figs 1 , 2A–B , 3C–F , 4A–B , 5C–F ). Epigynal septum as long as wide ( Figs 2C–D , 3G–H , 4C–D , 5G–H ) (longer than wide in Costacosa , Hogna and Trochosa ) ( Almquist 2005; Framenau & Leung 2013; Logunov 2020).

Etymology

The generic name is derived from the Latin word ‘ serratus ’ (‘DZffi状的’ in Chinese), which means serrated, and the lycosid generic suffix ‘ -cosa ’; referring to the serrated anterior edge of the median apophysis; gender feminine.

Description

CEPHALOTHORAX. Carapace gray brown, with light brown longitudinal marking on mid-line, eye region black. Fovea longitudinal. Radial furrows distinct. Chelicerae brown, with three promarginal and three retromarginal teeth. Labium and endites yellow brown, longer than wide. Sternum yellow brown and scutellate, with sparse brown setae.

LEGS. Yellow-brown, with black pigmentation. Leg formula: 4123.

OPISTHOSOMA. Oval, yellowish-brown, with lanceolate cardiac mark on anterior half and with black irregular markings on posterior half. Venter of abdomen yellow-brown.

PEDIPALPS ( Figs 1A , 2A–B , 3C–F , 4A–B , 5C–F ). With slender and hooked embolus. Terminal apophysis twisted, strongly grooved. Median apophysis complex, serrated, with two arms: ventral arm earlobeshaped and dorsal arm oval, with apical end. Conductor small, membranous.

EPIGYNE ( Figs 2C–D , 3G–H , 4C–D , 5G–H ). With wide, inverted T-like septum, spermathecal heads nearly spherical, with stalks short and curved. Fertilization ducts hook-like.

Composition

Three species: Serratacosa medogensis gen. et sp. nov., S. himalayensis ( Gravely, 1924) comb. nov. and S. multidontata ( Qu, Peng & Yin, 2010) comb. nov.

Distribution

China (Yunnan, Tibet), India (West Bengal, Assam) and Bhutan.

Remarks

The types of Hogna himalayensis were unavailable for our research, but it is clear from the descriptions and figures of Tikader & Malhotra (1980: 382, figs 255–257) and Buchar (1997: 14, figs 15–17), that the median apophysis is serrated and the epigynal septum inverted T-shaped.

Figures

Fig. 1. Serratacosa medogensis gen. et sp. nov. A. Embolus and terminal apophysis, ventral view. B. Embolus and terminal apophysis, bottom view. C. Median apophysis, ventral view. D. Median apophysis, dorsal view.

Fig. 2. Serratacosa medogensis gen. et sp. nov. A–B. Holotype, ♂ (SWUC-T-LY-12-01). C–D. Paratype, ♀ (SWUC-T-LY-12-08). A. Left pedipalp, ventral view. B. Left pedipalp, retrolateral view. C. Epigyne, ventral view. D. Vulva, dorsal view.

Fig. 3. Serratacosa medogensis gen. et sp. nov. A, E–F. Holotype, ♂ (SWUC-T-LY-12-01). B. Paratype, ♀ (SWUC-T-LY-12-08). C–D. Paratype, ♂ (SWUC-T-LY-12-02). G–H. Paratype, ♀ (SWUC- T-LY-12-08). A. Male habitus, dorsal view. B. Female habitus, dorsal view. C. Left pedipalp, bulbus, ventral view.D. Left pedipalp, bulbus, retrolateral view. E. Left pedipalp, ventral view. F. Left pedipalp, retrolateral view. G. Epigyne, ventral view. H. Vulva, dorsal view.

Fig. 4. Serratacosa multidontata (Qu, Peng & Yin, 2010) comb. nov. A–B. Paratype, ♂ (HNU). C–D. Paratype, ♀ (HNU). A. Left pedipalp, ventral view.B. Left pedipalp, retrolateral view.C. Epigyne, ventral view. D. Vulva, dorsal view.

Fig. 5.Serratacosa multidontata (Qu, Peng & Yin, 2010) comb. nov. A. Holotype, ♂(HNU). B. Paratype, ♀ (HNU). C–F. Paratype, ♂ (HNU). G–H. Paratype, ♀ (HNU). A. Male habitus, dorsal view. B. Female habitus, dorsal view. C. Left pedipalp, bulbus, ventral view. D. Left pedipalp, retrolateral view. E. Left pedipalp, ventral view. F. Left pedipalp, retrolateral view. G. Epigyne, ventral view. H. Vulva, dorsal view.