Trilacuna aenobarba ( Brignoli, 1978 ) Grismado & Deeleman & Piacentini & Izquierdo & Ramírez, 2014

Grismado, Cristian J., Deeleman, Christa, Piacentini, Luis N., Izquierdo, Matías A. & Ramírez, Martín J., 2014, Taxonomic Review Of The Goblin Spiders Of The Genus Dysderoides Fage And Their Himalayan Relatives Of The Genera Trilacuna Tong And Li And Himalayana, New Genus (Araneae: Oonopidae), Bulletin of the American Museum of Natural History 2014 (387), pp. 1-108 : 54-57

Trilacuna aenobarba ( Brignoli, 1978) , new combination

Figures 40–41 , 48B, D

Epectris aenobarbus Brignoli, 1978: 38 , figs. 8–9

(male holotype from Bhutan: Thimphu, Jan. 1, 1972, P.M. Brignoli, NMB 23009 PBI_OON 14906 ; examined).

NOTE: As stated by Platnick and Dupérré (2009a: 29) this species is clearly misplaced in Epectris , and is here transferred to Trilacuna by virtue of the characters described below.

DIAGNOSIS: The male of T. aenobarba is almost indistinguishable from that of T. bangla , but differs by the slightly shorter bulb and, especially, by the thickened palpal femur (fig. 48B, D).

REDESCRIPTION: Male (holotype, PBI_ OON 14906). Total length 1.92. Cephalothorax: Carapace orange, pars cephalica strongly elevated in lateral view, sides granulate, carapace of the type specimen crushed; lateral margin rebordered; nonmarginal pars cephalica setae light, in U-shaped row; nonmarginal pars thoracica setae lost; marginal setae absent. Clypeus vertical in lateral view, median projection absent; setae light, needlelike. All eyes subequal, oval; posterior eye row recurved from above, straight from front; ALE separated by their radius to diameter, ALE–PLE touching, PME touching throughout most of their length, PLE–PME separated by PME radius to PME diameter. Sternum longer than wide, pale orange, fused to carapace, without radial furrows between coxae I–II, II–III, III–IV, reticulate microsculpture covering entire surface, posterior margin not extending posteriorly of coxae IV; setae sparse, densest laterally, originating from surface. Mouthparts: chelicerae, endites, and labium pale orange. Endites distally not excavated. Abdomen: Dorsum soft portions white. Book lung covers large, round. Posterior spiracles connected by a shallow groove (fig. 4B). Pedicel ribbed, pedicel tube with a triangular ventral incision at the middle. Dorsal scutum pale orange, no soft tissue visible from above. Epigastric scutum not protruding. Postepigastric scutum pale orange, long, almost rectangular, covering about 3/4 of abdominal length, fused to epigastric scutum. Spinneret scutum present, incomplete ring. Dorsum setae dark, needlelike. Epigastric area setae uniform, dark, needlelike, a patch of strong, enlarged, posteriorly directed setae in the posterior margin of the epigastric scutum (fig. 41B). Postepigastric area setae dark, needlelike. Spinneret scutum without fringe of setae. Legs: Pale orange; patella plus tibia I shorter than carapace. Leg spination (all spines longer than segment width): leg I: tibiae v2- 2-2-2-0, metatarsi v2-2-0; leg II: tibiae v2-2-2- 2-0, metatarsi v2-2-0. Trichobothria not examined. Genitalia: Epigastric region with sperm pore large, circular, situated in front of anterior spiracles. proximal segments of palp pale orange; femur enlarged, dorsally thickened, with distal bulge (fig. 48D); trichobothria of tibia not examined; cymbium pale orange, distal part of bulb as follows: set of laminae with thin hairlike structures surrounding the base of the embolus (fig. 4B).

OTHER MATERIAL EXAMINED: None.

DISTRIBUTION: Known only from the type locality.

Figures

Fig. 40. Trilacuna aenobarba (Brignoli), male holotype. A. Habitus, dorsal view. B. Same, ventral view. C. Same, lateral view. D. Carapace, dorsal view. E. Same, ventral view. F. Same, lateral view.

Fig. 41. Trilacuna aenobarba (Brignoli), male holotype. A. Habitus, anterior view. B. Abdomen, ventral view. C. Left palp, retrolateral view. D. Same, dorsal view. E. Same, prolateral view.

Fig. 48. Trilacuna spp. A, C, E. T. bangla, new species (PBI_OON 12833). A. Female. C, E. Male. B, D. T. aenobarba (Brignoli), male holotype. A. Internal female genitalia, dorsal view. AP = apodemes; AS = anterior sclerite; GT= glandular tube; PR = posterior receptacle. B, C. Left palpi, prolateral view. D, E. Anterior part of carapace, lateral view, showing the enlarged palpal femur of T. aenobarba (arrow, in D).