Boagrius simoni, Zonstein & Marusik, 2020

Zonstein, Sergei L. & Marusik, Yuri M., 2020, A review of the spider genus Boagrius Simon, 1893 (Araneae: Palpimanidae), Raffles Bulletin of Zoology 68, pp. 91-102 : 97-100

Boagrius simoni , new species

( Figs. 2 E–H, 3G–K, 4E–I, 5G–L, 6C–F, 8)

Holotype. Male, MALAYSIA, Sabah State (Borneo Island), Lahad Datu District , Ulu Segama Forest Reserve , 4°57.9′N, 117°48.1′E, 200 m, pitfall trap, 1–2 November 2005, coll. D.J. Mann, E.M. Slade & J.F. Villanueva (OUMNH-2006-051a).

Paratypes. 1 female, collected together with the holotype, coll. E.M. Slade & J.F. Villanueva (OUMNH-2006-051b); 1 male, same collecting data but 24 November 2005, coll. D.J. Mann (OUMNH-2006-051c); 1 male, same collecting data but 4°57.7′N, 117°50.2′E, 250 m, pitfall trap, March 2005, coll. E.M. Slade & J.F. Villanueva (OUMNH-2005-062).

Etymology. The specific name is a patronym in honour of Dr. Eugene Simon (1848–1924), the outstanding French arachnologist who made an immense contribution to the study of spiders and described several thousand spider taxa, including the genus Boagrius and its type species.

Diagnosis. The species can be distinguished from B. pumilus by a darker carapace (carmine red vs. scarlet red in the latter species) and by the structure of the male and female copulatory organs: the tegular apophysis with a shallow bifurcation vs. a stronger developed bifurcation; the endogyne about 1.5 times wider than long, and the grape-shaped glands being relatively small (1/7 of the endogyne width) vs. the endogyne which is three times wider than long with larger glands (ca. 1/6 of the endogyne width).

Description. Male holotype (OUMNH-2006-051a). Habitus as in Fig. 2E, F . Colour in alcohol: carapace, sternum, labium, chelicerae, maxillae, and dorsal abdominal scutum carmine red; coxae and femora I–IV, and entire palp light orange; other segments of legs I–IV, and unsclerotised part of abdomen including spinnerets pale brownish white.

Measurements: TL 2.10, CL 1.10, CW 0.83, CH 0.27, CyL 0.19, femur I L/W 3.10 (0.90/0.29). Carapace: with coarse granulations ( Fig. 3G ). Eye sizes and interdistances: AME 0.14, ALE 0.05, PL 0.05, PM 0.04; AME–AME 0.04, AME– ALE 0.06, AME–PME 0.04, PLE–PME 0.10, PLE–PLE 0.14.

Palp and leg measurements: palp 0.99 (0.38 + 0.14 + 0.36 + 0.33), leg I 2.76 (0.90 + 0.61 + 0.57 + 0.29 + 0.39), leg II 2.38 (0.71 + 0.36 + 0.51 + 0.46 + 0.34), leg III 2.19 (0.64 + 0.33 + 0.43 + 0.50 + 0.29), leg IV 2.89 (0.86 + 0.43 + 0.67 + 0.60 + 0.33).

Palp ( Figs. 4 E–I, 5G–L). Tegular apophysis with shallow bifurcation. Embolus (Em) almost as long as tegular apophysis, distinctly screwed, with complex tip.

Female paratype (OUMNH-2006-051b). Habitus as in Fig. 2G, H . Colour in alcohol as in male, but entire body and legs I coloured slightly darker.

Measurements: TL 2.78, CL 1.29, CW 0.93, CH 0.64, CyL 0.22, femur I L/W 2.82 (0.96/0.34). Carapace: longer, with slightly less developed granulations than in male ( Fig. 3K ). Eye sizes and interdistances: AME 0.10, ALE 0.06, PLE 0.06,

PME 0.04, AME–AME 0.06, AME–ALE 0.06, AME–PME 0.07, PLE–PME 0.13, PME–PME 0.14.

Palp and leg measurements: palp 0.96 (0.30 + 0.10 + 0.28 + 0.28), leg I 3.01 (0.96 + 0.71 + 0.64 + 0.34 + 0.36), leg II 2.53 (0.79 + 0.36 + 0.56 + 0.46 + 0.36), leg III 2.46 (0.71 + 0.41 + 0.50 + 0.50 + 0.34), leg IV 3.25 (1.00 + 0.51 + 0.64 + 0.71 + 0.39).

Copulatory organs ( Fig. 6 C–F). Postgaster with three sclerites, two lateral and one median. Endogyne about 1.5 times wider than long; receptacles long, bent and with horizontal (transversal, Rt) and vertical (longitudinal, Rl) parts, horizontal part about 1.5 times shorter than vertical, well sclerotised in comparison to membranous vertical part; grape-shaped glands (Gg) and fine threads (Ft) originate from anterior part of receptacle; grape-shaped glands with long stem, as long as horizontal part of receptacle, head large, their diameter subequal to diameter of horizontal part of receptacle or 1/7 of endogyne width; pore glands (Pg) seem present on horizontal part of receptacle.

Distribution. Known only from the type locality ( Fig. 8 ).

Figures

Fig. 2. A–D, habitus of Boagrius pumilus; E–H, habitus of B. simoni, new species; A, B, E, F, males; C, D, G, H, females; A, C, E, G, dorsal view; B, D, F, H, lateral view. Scale bar = 1 mm.

Fig. 3. A–F, cephalothorax of Boagrius pumilus; G–I, cephalothorax of B. simoni, new species; A–D, G–I, males; E, F, J, K, females; A, E, G, J, dorsal view; B, F, H, K, ventral view; C, D, I, anterior part of cephalothorax in dorsal, ventral, and anterior view, respectively. Scale bar = 0.25 mm.

Fig. 4. A–D, details of male palp of Boagrius pumilus; E–I, details of male palp of B. simoni, new species; A, E, entire palp, retrolateral; B, F, same, prolateral; C, D, G, distal part of palp, ventral; H, I, same, proventral. Scale bar = 0.25 mm.

Fig. 6. A, B, female copulatory organs of Boagrius pumilus; C–F, female copulatory organs of B. simoni, new species; A, endogyne, receptacles, and accessory structures, ventral view; B, D, same, posterior view; C, E, F, same, dorsal view.Scale bar = 0.25 mm. Abbreviations: At, atrium; Ft, fine thread; Gg, grape-shaped gland; Pg, pore gland; Rl, Rt, longitudinal and transversal parts of receptacle, respectively.

Fig. 8. ●: distribution of Boagrius pumilus. ▲: distribution of B. simoni, new species. Open circle: type locality listed in the text. Solid symbols: new records listed in the text.