Tetrablemma tatacoa Martínez & Flórez & Brescovit 2020, sp. nov.

Tetrablemma tatacoa sp. nov. Figures 1 A−F, 2A−E, 3A−D, 4A−F, 5A−G.

Types. Holotype ♂ from 5km north of Villavieja (3°13′48.72″N; 75°10′44.26″W), Desierto de La Tatacoa, Huila, Colombia, 436m, VI.2016, A. Porta leg. (ICN-Ar-12266). Paratypes: two ♂ and two ♀, same data as holotype (ICN- Ar-12267 [1♀]; ICN-Ar-12268 [1♂]; ICN-Ar-12269 [1♂, 1♀]); one ♂ and ♀ same data as holotype (IBSP 246896); ♂ and ♀ same as holotype (MACN-Ar-41718 [1♂]; MACN-Ar-41747 [1♀]).

Etymology. The specific epithet is referent to the type locality where the species was found, La Tatacoa desert. The name is a noun in apposition.

Diagnosis. Males of Tetrablemma tatacoa sp. nov. resemble those of T. thamin Labarque & Grismado, 2009 and T. mochima sp. nov. by the presence of a process separated at the base of the embolus and an embolic process (see Labarque & Grismado, 2009:56, figs 1, 3; Fig. 6 D−E). Males of Tetrablemma tatacoa sp. nov. can be distin- guished from those of the other two species by having a unique process on the base of the embolus, which is 3/4 as long as the embolus (bifid in T. thamin, with branches of different lengths; whole but wider and shorter in T. mochima sp. nov.); a short embolic process almost 1/2 as long as the embolus (very reduced in T. thamin; absent or very small and subapically placed in T. mochima sp. nov.); and a long embolus, slightly curved at the anterior side (Figs 2 A−B, 4C−D). Females can be diagnosed by having an epigynum with very large and spherical seminal receptacles, a central process almost as long as the inner vulval plate, and thin lateral horns (Fig. 2 C−E).

Description. Male (Holotype, ICN-Ar-12266). Total body length 1.11, carapace length 0.41, width 0.39, height 0.37. Clypeus height 0.21. Eye diameters and interdistances: ALE 0.05, PLE 0.03; PLE separated by approximately one diameter. Sternum length 0.29, width 0.28. Chelicerae (paturon) length 0.14. Legs: Leg I—femur 0.37/ patella 0.11/ tibia 0.27/ metatarsus 0.19/ tarsus 0.20/ total 1.14; II—0.32/ 0.09/ 0.23/ 0.17/ 0.18/ 0.99; III—0.29/ 0.08/ 0.19/ 0.15/ 0.16/ 0.87; IV—0.37/ 0.11/ 0.27/ 0.18/ 0.15/ 1.08. Abdomen length 0.70, width 0.53. Body coloration reddishbrown (Fig. 1 A−C). Legs yellow-brown. Spinnerets yellow. Carapace: cephalothorax finely reticulated, slightly raised and suboval-shaped; four eyes in one group on a low tubercle at the posterior half of carapace, white with black ocular base, ALE>PLE, ALE and PLE adjacent; clypeus high and anteriorly projected with the anterior edge rounded (Fig. 1A); thoracic region reticulated and with radial grooves (Figs 1A, 3A); Chelicerae with a wide and developed frontal apophysis on the anterior side and with wide and laminar basal projections (Fig. 3 A−B); endites subquadrangular-shaped with a very wide basal edge and narrowing toward the distal edge; labium trapezoidalshaped and wider than long; sternum rugose and longer than wide (Fig. 1C). Leg cuticle striated and covered with modified setae mainly on metatarsus and tarsus (Fig. 4 E−F); tarsal claw very small and pectinated, with 7−8 teeth (Fig. 4F). Opisthosoma: covered with black and fine setae on posterior edge (Fig. 1A); dorsal scutum oval-shaped and smooth; ventral scutum (pulmonar scutum) finely reticulated and with some fine setae around the epyadrium (Figs 3C, 4 A−B); lateral scutum I very long, extending to the posterior side of the anal plate (Fig. 1B); postgenital scutum trapezoidal-shaped, long and narrow, with the anterior edge straight, and lateral edges with quadrangular apex; preanal scutum rectangular-shaped and approximately twice as wide as postgenital scutum, with all edges rounded. Six spinnerets surrounded by the anal plate (Fig. 3D), ALS large with two articles, basal article very wide, distal article short and covered by piriform gland spigots; PMS very short with two articles, with one relatively large spigot, presumably from a minor ampullate gland; PLS also with two articles, apical article flat and covered by long modified setae and long, presumably actiniform gland spigots (Fig. 3D). Palp: femur cylindric with some simple setae on the cuticle; patella short with long setae; tibia short and very swollen with simple and long setae; cymbium short with black and long setae and a small organ; bulb large and pear-shaped; spermatic ducts very wide at the base and narrowing toward the embolus; embolus long, straight, and inserted basally, filiform toward distal end with a short and sharp embolic process; process of the embolic base approximately 3/4 as long as the embolus (Figs 2 A−B, 4C−D).

Female (Paratype, ICN-Ar-12267). Total body length 1.13, carapace length 0.41, width 0.40, height 0.27. Clypeus height 0.13. Eye diameters and interdistances: ALE 0.05, PLE 0.04; PLE separated by one diameter. Sternum length 0.28, width 0.27. Chelicerae (paturon) length 0.13. Leg measurements: Leg I—femur 0.27/ patella 0.09/ tibia 0.19/ metatarsus 0.16/ tarsus 0.12/ total 0.83; II—0.24/ 0.09/ 0.16/ 0.16/ 0.14/ 0.79; III—0.26/ 0.10/ 0.18/ 0.16/ 0.16/ 0.86; IV—0.36/ 0.11/ 0.31/ 0.22/ 0.13/ 1.13. Abdomen length 0.72, width 0.58. Coloration as male (Fig. 1 D−F). Carapace: cephalothorax finely reticulated slightly raised and subtriangular-shaped; eyes white, ALE>PLE i n size; clypeus high and anteriorly projected (Fig.1D); thoracic region granulated and with radial grooves (Fig. 5A); Chelicerae with wide and a slightly developed apophysis on the proximal side (Fig. 5B); endites subquadrangular-shaped with a wide basal edge, narrowing toward the distal edge (Fig. 5D); labium trapezoidal-shaped and wider than long (Fig. 5 C−D); sternum rugose with few setae on lateral edges (Fig. 5 C−D). Leg cuticle striated (Fig. 1 D−F). Opisthosoma: covered with white and black fine setae, mainly on posterior edge (Fig. 1D); dorsal scutum oval-shaped and smooth; ventral scutum (pulmonar scutum) covered with short and fine setae (Fig. 5E); lateral scutum long, extending to half of the anal plate (Fig. 1B); postgenital scutum subrectangular-shaped, long, and narrow (Fig. 5E); preanal scutum rectangular-shaped and wide, with rounded borders (Fig. 5E). Epigynum: orifice small and situated on posterior edge of epigynal fold; inner epigynal plate long and straight; central process short; seminal receptacles large, membranous, and bean-shaped; vulval ducts long and thin (Fig. 2 C−E).

Variation. Males (n=6): total length: 1.00–1.06; carapace length: 0.47–0.52. Females (n=6): total length: 1.02– 1.17; carapace length: 0.41–0.51.

Habitat. The specimens were collected using Berlese-Tullgren traps from leaf litter and between shrubs and plants of the family Cactaceae, in a tropical dry forest (following the classification proposed by Etter et al., [2008]), within a regenerated fragment in the Huila department.

Distribution. Only known from its type locality (Fig. 7).