Bowie binturong, Omelko & Fomichev, 2023

Omelko, Mikhail M. & Fomichev, Alexander A., 2023, A survey of Sumatran Ctenidae (Araneae). 2. Three new species of Bowie Jäger, 2022, Zootaxa 5353 (2), pp. 101-116 : 111-115

Bowie binturong sp. nov.

( Figs. 37–54 , 55–57 )

Type material. INDONESIA: Sumatra: Holotype: ♁ ( ZMMU), Kedah Vil[lage]. [03°59′N, 97°15′E] , 1300–1500 m, 1988 (precise date unknown), unknown collector. Paratypes:♁ ( FEFU), 4♁ 2♀ ( ISEA), together with the holotype .

Etymology. The specific name is derived from the Malayo-Polynesian name of the bearcat, “binturong” [ Arctictis binturong (Raffles) ], reflecting the fact that the new species also occurs in the jungles of Sumatra Island.

Diagnosis. Males of B. binturong sp. nov. are similar to those of B. neukoeln Jäger, 2022 and B. scarymonsters Jäger, 2022 by a diagonally orientated tegular apophysis (TA, Figs 42, 49 ), an embolus with a basal, ventrad bulge (VB) and a retrolateral tibial apophysis (RTA) subdistally arising and apically pointed ( Figs 42, 46 ). Males of B. binturong sp. nov. can be distinguished from both species by 1) RTA shifted proximally and arising medially from tibia (vs. retrolateral tibial apophysis arising more distally from tibia cf. Figs 44, 46 and Jäger 2022: figs 448, 461); and 2) the tip of the embolus (Em) reaching the conductor (C) (vs. not reaching; cf. Fig. 49 and Jäger 2022: figs 449, 462). Additionally, the new species can be distinguished from B. neukoeln by the wide gap between the base of embolus and the prolateral margin of tegular apophysis in ventral view (vs. no gap; cf. Fig. 49 and Jäger 2022: fig. 448), and from B. scarymonsters by the tegular apophysis (TA) covering the tip of the embolus (vs. not covering; cf. Fig. 49 and Jäger 2022: fig. 461) and the small dorso-proximal cymbial extension (CE) (vs. large; cf. Fig. 43 and Jäger 2022: fig. 462). From both other species of this group, it differs by strongly concaved ventral margin of embolus in ventral view (vs. almost flat; cf. Fig. 48 and Jäger 2022: figs 450, 463).

Females of B. binturong are similar to those of B. neukoeln and B. scarymonsters by a median plate (MP) transversally oval ( Fig. 51 ), lateral teeth (LT) situated at posterior margin of epigyne and bottle-shaped spermathecae (Sp) ( Figs 53–54 ). Females of the new species differ by 1) median plate (MP) widest posteriorly (vs. medially; cf. Fig. 51 and Jäger 2022: figs 453, 456, 459, 466), and 2) spermathecae separated by a gap equal to 0.3 their width (vs. 0.8 and 1 of width, respectively) (cf. Fig. 51 and Jäger 2022: figs 459–460, 466, 468).

Description. Male ( Figs 37–38 ). Total length 11.2. Carapace 6.1 long, 4.65 wide. Opisthosoma 5.0 long, 3.25 wide. Carapace brown, with broad yellow median band, diamond-shaped in ocular area. Lateral bands absent. Fovea thin, black. Chelicerae dark brown, almost black with 2 promarginal and 4 retromarginal teeth, without denticles. Sternum light brown with barely visible longitudinal stripe. Labium dark brown. Endites brown with yellowish outer edge.

Dorsal part of opisthosoma greenish gray with distinct yellowish cardiac mark and two stripes besides it. Ventral part of abdomen dark gray with poorly visible yellowish spots forming V-mark. Spinnerets yellowish with gray on the external sides.

Eye diameters: AME 0.27, ALE 0.17, PME 0.36, PLE 0.33; interdistances: AME–AME 0.16, AME–ALE 0.37, PME–PME 0.17, PME–PLE 0.38, AME–PME 0.08, ALE–PLE 0.18. Clypeus height at AME 0.07.

For palp and legs measurements see Table 9 . Femora I–IV dark brown dorsally, light brown laterally and ventrally. Remaining segments brown with inconspicuous annulation. Tibiae I with short golden setae. For palp and leg spination see Table 10.

Palp as shown in Figs 41–50 . RTA arising from the middle of tibia, short with pointed tip. Dorso-proximal cymbial extension (CE) short, forming a right angle. Tegular apophysis (TA) elongated, originating in a 5:30 o’clock-position. Conductor (C) large, almost circular. Embolus (Em) originating from tegulum in 8-o’clock-position, tip simple, pointed.

Female ( Figs 39–40 ). Total length 12.6. Carapace: 6.2 long, 4.9 wide. Opisthosoma: 6.6 long, 4.6 wide. Coloration as in male. Chelicerae with 3 promarginal and 4 retromarginal teeth, without denticles.

Eye diameters: AME 0.27, ALE 0.23, PME 0.34, PLE 0.37; interdistances: AME–AME 0.21, AME–ALE 0.41, PME–PME 0.29, PME–PLE 0.44, AME–PME 0.11, ALE–PLE 0.17. Clypeus height at AME 0.23. For palp and legs measurements see Table 11. Leg coloration like in males, but tibiae I without short golden setae. For palp and leg spination see Table 12 .

Epigyne as shown in Figs 51–54 . Epigynal field slightly wider than long (ratio width/length = 1.07). Median plate (MP) widest in its posterior part. Lateral teeth (LT) large. Spermathecae (Sp), bottle-shaped.

Notes. According to the structure of the copulatory organs (such as diagonally oriented tegular apophysis, embolus with a basal bulge, and subdistally arising, pointed RTA in males and transversally oval median plate, lateral teeth situated at posterior margin of epigyne etc. in females) Bowie binturong sp. nov. belongs to the scarymonsters species-group ( Jäger 2022). Therefore, with description of the new species, this group now consists of 4 species: B. neukoeln ( Malaysia Peninsula), B. scarymonsters (Sumatra) , B. sabah Li & Yao (Kalimantan) and Bowie binturong sp. nov.

Distribution. Type locality only ( Figs 55-57 ).

Figures

FIGURES 37–40. Bowie binturong sp. nov., male (37–38) and female (39–40) habitus. 37, 39—dorsal; 38, 40—ventral. Scale bars: 1 mm.

FIGURES 41–50. Bowie binturong sp. nov., male palp (41–44), palpal tibia (45–46) and bulb (47–50). 41, 48—prolateral; 42, 46, 49—ventral; 43, 45, 50—retrolateral; 44—dorsal; 47—anterior. Scale bars: 0.2 mm. Abbreviations: C—conductor, CE—cymbial extension, Em—embolus, RTA—retrolateral tibial apophysis, TA—tegular apophysis, VB—ventrad bulge of embolus.

FIGURES 51–54. Bowie binturong sp. nov., female genitalia, intact (51) and macerated (52–54). 51, 52—ventral, 53—dorsal, 54—posterior. Scale bars: 0.2 mm. Abbreviations: FD—fertilization duct, LT—lateral tooth, MP—median plate, Pr—median plate projection, Sp—spermatheca.

FIGURES 55–57. Collecting localities of studied Bowie species. Circle—Bowie beruang sp. nov., triangle—B. dhole sp. nov., square—B. binturong sp. nov. The frame on Fig. 57 refers to the content of Fig. 56 and the frame on Fig. 56 refers to the content of Fig. 55.