Boagrius pumilus Simon, 1893

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 : 93-97

Boagrius pumilus Simon, 1893

( Figs. 1 A–L, 2A–D, 3A–F, 4A–D, 5A–F, 6A, B, 8)

Boagrius pumilus Simon, 1893a: 405 ; 1893b: 211 (female); Murphy & Murphy, 2000: 240, fam. 45 fig. 1; Murphy & Roberts, 2015: 140, pl. 238 (female).

Holotype. Female , SINGAPORE, no other data ( MNHN; borrowed to date by another museum, thus not examined).

Material examined. SINGAPORE, 1 male, 1 female, 1 juvenile, Bukit Timah , 100 m, 20–25 February 1988, coll .

F. Murphy & J. Murphy ( MMUM G7572.3055); 1 subadult female, same collecting data but 15 August 1992 ( MMUM G7572.3112 ) ; 1 juvenile, Upper Pierce Reservoir , in litter, 19 February 1988, coll. F. Murphy & J. Murphy ( MMUM G7572.3258 ) . MALAYSIA, 1 male, Pahang State, Bukit Fraser , wet moss and litter, 18 November 1984, coll. P. Lehtinen ( ZMUT) ; 1 subadult female, same collection data, 1,420 m, roadside ferns and bush, 14 March 1998, coll. P. Lehtinen ( ZMUT) ; 1 female, same locality, Jeriau Waterfall , 3°43′26.07″N, 101°42′36.22″E, 1,040 m, disturbed primary forest, leaf litter (sieving), 18 June 2013, coll. P. Jäger ( SMF) .

Diagnosis. The species can be distinguished from B. simoni , new species, by the lighter carapace (scarlet red vs. carmine red) and by the structure of the male and female copulatory organs: a terminal part of the tegular apophysis with a fairly developed bifurcation ( Figs. 3C, D , 4C, D ) vs. a shallow, almost indistinct depression in B. simoni , new species ( Fig. 4 G–I); the endogyne is ca. 3 times wider than long and the pore glands are located anteriorly ( Fig. 5A, B ), while in B. simoni , new species, the endogyne is about 1.5 times wider than long and the pore gland is located posteriorly.

Description. Male (from Bukit Frazer, ZMUT). Habitus as in Fig. 2A, B . Colour in alcohol: carapace, sternum, labium, chelicerae, maxillae, and dorsal abdominal scutum bright scarlet red; coxae and femora I–IV, and entire palp light orange; other segments of legs I–IV, and unsclerotised part of abdomen including spinnerets milky white.

Measurements: TL 2.36, CL 1.14, CW 0.87, CH 0.64, CyL 0.20, femur I L/W 3.44 (0.93/0.27). Carapace with moderately coarse granulations ( Fig. 3A ). Eye sizes and interdistances: AME 0.14, ALE 0.05, PLE 0.04, PME 0.05, AME–AME 0.04, AME–ALE 0.04, AME–PME 0.09, PLE–PME 0.11, PME–PME 0.14.

Palp and leg measurements: palp 0.99 (0.34 + 0.12 + 0.24 + 0.29), leg I 2.91 (0.93 + 0.64 + 0.60 + 0.31 + 0.43), leg II 2.51 (0.76 + 0.43 + 0.50 + 0.43 + 0.39), leg III 2.34 (0.67 + 0.39 + 0.46 + 0.46 + 0.36), leg IV 3.15 (0.94 + 0.43 + 0.71 + 0.64 + 0.43).

Palp ( Figs. 3C, D , 4 A–D, 5A–F). Tegular apophysis (Ta) long (subequal to the length of tegulum), straight, with bent and bifurcated tip; embolus (Em) well sclerotised, relatively long (ca. 1.5 times shorter than tegular apophysis), partly screwed (bent around the axis), with thin apophysis (Ea).

Female (from Bukit Frazer, SMF). Habitus as in Fig. 2C, D . Colour in alcohol as in male.

Measurements: TL 2.65, CL 1.21, CW 0.91, CH 0.6, CyL 0.21, femur I L/W 2.97 (1.07/0.36). Carapace: longer, with less coarse granulations than in male ( Fig. 3E ). Eye sizes and interdistances: AME 0.11, ALE 0.06, PLE 0.04, PME 0.06, AME–AME 0.06, AME–ALE 0.06, AME–PME 0.06, PLE–PME 0.11, PME–PME 0.13.

Palp and leg measurements: palp 0.75 (0.24 + 0.09 + 0.21 + 0.21), leg I 3.20 (1.07 + 0.67 + 0.67 + 0.36 + 0.43), leg II 2.68 (0.86 + 0.43 + 0.57 + 0.43 + 0.39), leg III 2.39 (0.71 + 0.39 + 0.50 + 0.46 + 0.33), leg IV 3.47 (1.07 + 0.47 + 0.79 + 0.71 + 0.43).

Copulatory organ ( Fig. 6A, B ). Posterior edge of epigastric furrow (postgastric area) with a pair of lateral (Ls) scuta, median scutum indistinct, lateral scuta almost invisible after maceration; endogyne almost three times wider than long; atrium (At) large; lateral parts (receptacles?) suboval, well sclerotised, receptacles seem fused anteriorly; anterior part with pore-gland field (Pg); grape-shaped glands very large, about 1/6 of endogyne width.

Note. Endogyne was lost during preparation of the figure.

Distribution. South part of the Malay Peninsula: Singapore and Malaysia (Pahang State). See Fig. 8 .

Figures

Fig. 1. Scaled SEM micrographs of somatic structures of Boagrius pumilus (subadult female from Bukit Fraser, Malaysia). A, carapace, anterior view; B, thoracic fovea, dorsal; C, posterior notch of carapace; D–F, chelicera, anteroventral, ventral, and posteroventral view, respectively; G, H, palpal endites, ventral; I, palp, prolateral; J, leg I, tibia to tarsus, prolateral; K, apex of tarsus I, showing tarsal claws and tufts, anterior view; L, same, leg IV, retrolateral view.

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. 5. Scaled SEM micrographs. A–F, male palp and copulatory organs of Boagrius pumilus; G–L, male palp and copulatory organs of B. simoni, new species; A, G, entire palp, prolateral and retrolateral view, respectively; B, distal palpal sclerites, retrolateral; C, H, K, same, ventral; D, J, same, prolateral; E, F, I–L, same, anterior view. Abbreviations: Ea, thin apophysis; Em, embolus; Ta, tegular apophysis.

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. 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.