Stenaelurillus senegalensis, Logunov & Azarkina, 2018

Logunov, Dmitri V. & Azarkina, Galina N., 2018, Redefinition and partial revision of the genus Stenaelurillus Simon, 1886 (Arachnida, Araneae, Salticidae), European Journal of Taxonomy 430, pp. 1-126 : 95-98

Stenaelurillus senegalensis sp. nov.

urn:lsid:zoobank.org:act:F3DC4328-0106-4FE7-8A3D-19569B3E91A6 Figs 426–441 , 510

Diagnosis

The new species is most similar to S. nigricaudus , with both species having almost identical body coloration (cf. Figs 435–441 and 382–390, 400–405). The only colour difference is that of the ventral sides of Tb and Mt I in the males: yellow in S. senegalensis sp. nov. ( Fig 435–437 ) and dark brown in S. nigricaudus ( Figs 391–394 ). The males of both species can easily be distinguished by the conformation and relative length of the embolus, which is comparatively long (almost twice as long as the tegulum length) and straight, and situated on the functional tegulum at about 10 o’clock in the new species and comparatively short, hook-shaped and situated apically at 12 o’clock in S. nigricaudus (cf. Figs 426 and 369). The female of S. senegalensis sp. nov. can be separated from that of S. nigricaudus by the absence of the deep epigynal pocket, which is present in the latter species; the epigynal plate in S. senegalensis sp. nov. visibly overhangs the epigastric furrow. The spermathecae of both species are virtually indistinguishable.

Etymology

The specific epithet is named after the country of origin, Senegal.

Material examined

Holotype

SENEGAL: ♂, ca 20 km S of Richard Toll , ca 16°27′32.0″ N, 15°41′38.4″ W, savanna, pitfall traps, 23 Sep. 1991, H. van der Valk leg. ( MRAC ex-201.167).

Paratypes

SENEGAL: 6 ♂♂, 1 ♀, together with the holotype ( MRAC ex-201.167).

Description

Male

Measurements (the smaller male = the holotype, the larger one = a paratype). Carapace: 1.70–2.10 long, 1.40–1.60 wide, 1.00–1.10 high. Abdomen: 1.60–2.00 long, 1.30–1.45 wide. Ocular area: 0.75–0.90 long, 1.00–1.10 wide anteriorly, 0.90–1.00 wide posteriorly. Cheliceral length 0.45–0.55. Clypeal height 0.25. Diameter of AME 0.30–0.35. Length of leg segments (the bigger male, paratype): I 1.00 + 0.45 + 0.60 + 0.50 + 0.45 (3.00); II 1.00 + 0.55 + 0.55 + 0.50 + 0.40 (3.00); III 1.60 + 0.80 + 1.00 + 1.40 + 0.55 (5.35); IV 1.50 + 0.60 + 1.10 + 1.45 + 0.65 (4.30). Leg formula III,IV,II/I. Leg spination: I: Fm d 0-1- 1-5; Pt pr 0-1-0; Tb pr 1-1, v 1-1-2ap; Mt pr 0-1ap, v 2-2ap. II: Fm d 0-1-2-5; Pt pr 0-1-01; Tb pr 1-1, v 1-1-2ap; Mt pr 1-1, v 2-2ap. III: Fm d 0-1-2-5; Pt pr and rt 0-1-0; Tb d 1-0-0, pr and rt 1-1-1-1, v 1-0-2ap; Mt d 1-1-0, pr 1-1-2ap, rt 1-0-2ap, v 0-1-2ap or 0-2-2ap. IV: Fm d 0-1-2-5; Pt pr and rt 0-1-0; Tb d 1-0-0, pr and rt 1-1-1-1, v 1-0-2ap or 2-0-2ap; Mt d 1-1-0, pr and rt 1-1-2ap, v 1-2-2ap. Coloration (in alcohol; Figs 435–437, 439 ). Carapace brown, covered with brown scales, with two longitudinal wide stripes originating from PLEs and running toward the rear end of the carapace, covered with white scales; sides with marginal stripes of white scales. Eye field dark brown, covered with yellow-white scales and dark brown long bristles. Sternum yellow. Endites and labium yellow. Chelicerae yellow, covered with white hairs. Clypeus high, yellow (in the holotype) to brown-yellow (in the paratypes), densely covered with long white hairs. Abdomen: venter yellow; dorsum with scutum covering ¾ of the abdomen length, dorsum dark brown, with four white-yellow spots (two on the anterior half and two on the posterior one) and wide median stripe covered with brown hairs on the posterior half; spots are poorly marked in some specimens. Book-lung covers yellow. Spinnerets: the first two pairs yellow, the dorsal pair dark brown. Legs I dark brown. Tb and Mt III and IV with two dorsal semi-rings of dark brown hairs. Palps yellow, covered with white hairs; palpal Tb prolaterally with long brown hairs; cymbium dorsally with sparse brown bristles. Palpal structure as in Figs 426–428, 431–434 : VTA bulge-shaped; RTA thick and straight, directed anteriad and slightly bent mediad; the cymbium simple, without the cymbial lateral process; the tegulum small and elongated, with a well-developed, finger-shaped tegular process; the functional tegulum wide and elongated, with a well-developed, pointed proximal (PP) projection and without a distal projection; the embolus straight and long, almost as long as one half of the tegulum length, with the wide base fused to the apical edge of the functional tegulum.

Female (paratype, Figs 438, 440–441 )

Measurements: carapace: 2.50 long, 2.00 wide, 1.30 high. Abdomen: 3.45 long, 2.65 wide. Ocular area: 0.95 long, 1.50 wide anteriorly, 1.40 wide posteriorly. Cheliceral length 0.65. Clypeal height 0.30. Diameter of AME 0.40. Length of leg segments: I 1.20 + 0.65 + 0.70 + 0.60 + 0.50 (3.65); II 1.20 + 0.65 + 0.65 + 0.55 + 0.50 (3.55); III 1.95 + 1.10 + 1.30 + 1.60 + 0.60 (6.55); IV 1.85 + 0.75 + 1.40 + 1.70 + 0.80 (6.50). Leg formula III,IV,I,II. Leg spination: I: Fm d 0-1-1-5; Pt pr 0-1-0; Tb pr 1-1, v 1-1- 2ap; Mt pr 0-1ap, v 2-2ap. II: Fm d 0-1-2-5; Pt pr 0-1-0; Tb pr 1-1, v 1-1-2ap; Mt pr 1-1, v 2-2ap. III: Fm d 0-1-2-5; Pt pr and rt 0-1-0; Tb d 1-0-0, pr and rt 1-1-1-1, v 1-0-2ap; Mt d 1-1-0, pr 1-1-2, rt 1-0-2, v 1-0- 2ap. IV: Fm d 0-1-1-4; Pt pr and rt 0-1-0; Tb d 1-0-0, pr and rt 1-1-1-1, v 1-0-2ap; Mt d 1-1-0, pr and rt 1-1-2, v 1-2-2ap. Coloration (in alcohol; Figs 438, 440–441 ). Carapace brown, covered with dark brown hairs and with two longitudinal dorsal stripes covered with white scales, running from ALEs (narrow in the area of the eye field) to the rear end of the carapace (wide in the thorax); sides with marginal stripes

of white scales. Sternum yellow. Endites and labium brownish yellow. Chelicerae yellow, covered with white hairs. Clypeus high, brownish yellow, covered with white hairs. Abdomen: venter grey-yellow; dorsum yellow, covered with white hairs and with two wide longitudinal stripes covered with brown hairs; median dorsal stripe yellow, anteriorly tinged with brown and covered with white hairs and sparse brown hairs and bristles. Book-lung covers yellow. Spinnerets yellow, with brown tips. Legs yellow, with patches and semi-rings of dark brown hairs. Palps yellow, but their Tr dark brown. Epigyne and spermathecae as in Figs 429–430 : the epigynal plate flat, its rear end overhangs the epigastric furrow; epigynal pocket absent; copulatory openings widely separated, facing backwards; insemination ducts short and wide, bent dorsally; primary spermathecae large and round.

Distribution

The type locality only ( Fig. 510 ).

Figures

Figs 426–434. Stenaelurillus senegalensis sp. nov., holotype, ♂ (425–427) and paratypes (428–434). 425–427. Male palp. 425. Ventral view. 426. Retrolateral view. 427. Dorsal view. 428. Diagrammatic course of the insemination ducts. 429. Epigyne, ventral view. 430. Spermathecae, dorsal view. 431– 434. Embolic division. 431. Median view. 432. Apical view. 433. Dorsal view. 434. Retrolateral view. Scale bars: 0.1 mm.

Figs 435–441. Stenaelurillus senegalensis sp. nov., paratypes, general appearance. 435–437, 439. ♂. 438, 440–441. ♀. Scale bars: 1 mm.

Figs 382–394. Stenaelurillus nigricaudus Simon, 1886, ♂♂. 382–390. General appearance. 391, 393. Legs 1, prolaterally. 392, 394. Legs 1, retrolaterally. Specimens: 382, 385–386, 388–389, 391– 392 from Burkina Faso; 383–384, 387, 390, 393–394 from Senegal (Richard Toll). Scale bars: 1 mm.

Fig. 510. Collecting localities of seven African species of Stenaelurillus Simon, 1885.