Chumma interfluvialis, Jocqué & Alderweireldt, 2018

Jocqué, Rudy & Alderweireldt, Mark, 2018, New Chummidae (Araneae): quadrupling the size of the clade, European Journal of Taxonomy 412, pp. 1-25 : 9-12

Chumma interfluvialis sp. nov.

urn:lsid:zoobank.org:act:06C2288D-19D5-496B-99CF-0733D34FD871 Figs 4 A–F, 5A–D, 12

Diagnosis

Males of C. interfluvialis sp. nov. are recognized by the presence of prolateral spines on P III, the palpal tibia with dorsal apophysis with rounded tip and foliate ventral apophysis with dorsal tooth, and the sinuous embolus; the female is characterized by the epigyne with a dark roughly oval central area near the posterior margin.

Etymology

The specific epithet refers to type locality ‘Tussen-die-Riviere’ which means ‘between the rivers’, ‘ interfluvialis ’ in Latin.

Material examined

Holotype

SOUTH AFRICA: ♂, Free State Province, Tussen-die-Riviere Nature Reserve, Bank of Orange river, 30°29.192′ S, 26°10.557′ E, 1270 m a.s.l., dense Acacia karroo woodland, sifting leaf litter, 15 Oct. 2008, C. Haddad and L. Lotz leg. ( NCA 2015 /4657).

Paratypes

SOUTH AFRICA: 2 ♂♂, 2 ♀♀, 3 juveniles, same collecting data as for holotype ( NCA 2015/4658).

Description

Male

BODY MEASUREMENTS. TL 2.83, CL 1.17, CW 0.87, CH 0.47.

CARAPACE. Dark yellow, with medium brown radiating striae ( Fig. 4A ). Chelicerae, legs and sternum uniform yellow.

ABDOMEN. Dorsum covered entirely with brown scutum. Anterior setae spine-shaped, in sockets in front of small pale circles, these smaller further backwards, absent from half way length; sides and venter pale, provided with dense cover of setae and rows of apodemes.

EYES. AME: 0.17; ALE: 0.30; AME–AME: 0.03; AME–ALE: 0.03; PME: 0.20; PLE: 0.20; PME–PME: 0.20; PME–PLE: 0.13. Clypeus 0.17 or 0.63 times width of ALE.

STERNUM. Length 1.83, width 1.63.

LEGS. Tarsi I and II fusiform. Fe I with one dorsal and one prolateral spine, Fe II with one dorsal spine; Pa III with one proximal spine and a distal row of three spines.

PALP ( Figs 4 C–D, 5A–C). Tibia with many long setae, with two apophyses: dorsal one with flat twisted base, rounded dorsal prong and sharp ventral prong; ventral one short with short sharp tip pointing upwards; embolus central on distal part of tegulum, flat, slightly sinuous, MA with elongate membranous prong.

Female

BODY MEASUREMENTS. TL 2.90, CL 1.17, CW 0.97, CH 0.43.

PATTERNS AND COLOUR. Very similar to male ( Fig. 4B ). Abdominal scutum shorter and posterior margin concave; fewer apodemes.

EYES. AME: 0.20; ALE: 0.27; AME–AME: 0.07; AME–ALE: 0.03; PME: 0.23: PLE: 0.30; PME–PME: 0.20; PME–PLE: 0.10. Clypeus 0.17 or 0.57 times width of ALE.

STERNUM. Length 1.67, width 1.57, almost as wide as long.

LEGS. Anterior pairs of tarsi slightly curved but not fusiform. Fe I with one dorsal and one prolateral spine, Fe II with one dorsal spine; no spines on Pa III.

EPIGYNE ( Figs 4 E–F, 5D). Oval sclerified area with two black spots, separated by small, dark recurved ridge; with central rounded tip, dark spermathecae visible in transparency; spermathecae large, oval and converging towards back.

Distribution

Known from the Tussen-die-Riviere Nature Reserve in the Free State in South Africa ( Fig. 12 ).

Figures

Fig. 4. Chumma interfluvialis sp. nov. A, C–D. Holotype, ♂. B, E–F. Paratype, ♀. A. Habitus, dorsal view. B. Habitus, dorsal view. C. Palp, ventral view. D. As preceding, retrolateral view. E. Epigyne, ventral view. F. Epigyne, cleared, dorsal view. Scale bars: A–B = 0.5 mm; C–F = 0.2 mm.

Fig. 12. Distribution map of Chumma spp.: C. bicolor sp. nov. (▲); C. foliata sp. nov. (●); C. gastroperforata Jocqué, 2001 (●); C. inquieta Jocqué, 2001 (Ǫ); C. interfluvialis sp. nov. (■); C. lesotho sp. nov. (●); C. striata sp. nov. (●); C. subridens sp. nov. (●); C. tsitsikamma sp. nov. (●).