Stormtropis parvum, Perafan, Carlos, Galvis, William & Perez-Miles, Fernando, 2019

Perafan, Carlos, Galvis, William & Perez-Miles, Fernando, 2019, The first Paratropididae (Araneae, Mygalomorphae) from Colombia: new genus, species and records, ZooKeys 830, pp. 1-32 : 1

Stormtropis parvum sp. n. Figure 9

Type material.

Holotype male from Colombia, Caldas, Pensilvania, Berlín, 5.35222N, 75.18611W, 2750 m, 24-28-vii-2004, col. E Gonzáles, L Arango, JM Molina (ICN-Ar 11444).

Diagnosis.

Stormtropis parvum sp. n. differs from the other species of the genus by the less numerous and discontinuous row of cheliceral teeth on promargin (2-2-3) (Figure 9B), and by the presence of a tibial apophysis, with a larger base, more separated from the tibia than on the other species (Figure 9D, E). Additionally, differs from S. paisa by the absence of a sclerotized dark mark on proximal dorsal tibia, without excavation, and lower number of spines in the spur (eleven on the distal row and six on proximal).

In addition, S. parvum is smaller (6mm), with lighter red and brown tones, and lives at higher elevation (2750 m) than S. colima (8.4 mm; 1377 m) and S. paisa (8.5 mm; 2400 m).

Description.

Holotype male (ICN-Ar 11444) (Figure 9): total length 6.0; carapace length 2.9, width 2.8; abdomen length 2.8, width 2.3; chelicerae length 1.5. Color (in alcohol): body with soil particles encrusted; carapace, chelicerae, coxa, trochanter and femur red brown; abdomen dorsally and patella-tarsus brown. Carapace: glabrous, striae conspicuous, lateral margins with single line of curved setae mixed with disperse clubbed setae; caput arched, separated from thoracic region by transverse shallow fovea, straight, width 0.3 (Figure 9A). Eyes and ocular tubercle: tubercle length 0.5, width 0.6, very elevated (height 0.4) and forwardly directed, with few stout setae. Clypeus absent. Anterior eye row slightly procurved, posterior slightly recurved. Ocular sizes and interdistances: AME 0.15, ALE 0.18, PME 0.13, PLE 0.14, AME-AME 0.10, AME-ALE 0.03, PME-PME 0.25, PME-PLE 0.03, ALE-PLE 0.03, AME-PME 0.03, ALE-ALE 0.35, PLE-PLE 0.38. Chelicerae: dorsally with few plumose setae, short sparse bristles on dorsal and lateral areas, long fine bristles on ventral and anterior area. Rastellum absent. Cheliceral furrow narrow with two rows of teeth, 7 teeth on promargin, on a discontinuous row (proximal-distal: 2-2-3); and 8/9 teeth on retromargin. Fang long. Labium subquadrate, length 0.25, width 0.65, with 20 elongated cuspules on anterior edge (Figure 9C). Labio-sternal groove narrower in the middle than laterally. Maxillae longer than wide, with the anterior prolateral lobe very elongated, conical; with 24/29 elongated cuspules widely distributed throughout the prolateral half of the maxillae; field of cuspules wider proximally (Figure 9C). Sternum heart shaped, length 1.15, width 1.53; three pairs of sigillae, anterior and median subcircular, submarginal; posterior sigillae oval, marginal (Figure 9C).

Legs: cuticle with soil particles encrusted. Leg and palpal segments measurements provided in Table 8. Leg I slightly stouter than II–IV. Clubbed plumose and thorn-like setae. Trichobothria: filiform, on central 2/3 of tarsi, palp and all legs 3; on distal 1/4 of metatarsi, all legs 2; and on proximal 1/3 of tibiae, palp and legs I–III two rows of 2 each, IV 3. Scopula absent, few and sparse pseudocopula setae on tarsi I and II. Claw tufts absent. Tarsal claws: ITC absent on all legs; STC long, with one tooth on all legs. Tibial apophysis on leg I present: only one flattened branch on distal prolateral side, with spines on two parallel rows: 11 distal and 6 proximal (Figure 9D, E). Thorn-like setae mainly present on legs III and IV. Spines absent.

Palp: cymbium with two unequal lobes separated by a sclerotized groove; tibia with shallow distoventral groove. Palpal bulb pyriform elongated; embolus curved very long, tapering to the apex; a triangular translucent tooth on the subapical region (Figure 9F, G).

Abdomen: oval, with seven transverse dorsal rows of 4-6 small clubbed setae; lateral and dorsal area finely tuberculate, with smaller plumose clubbed setae, principally on posterior area (Figure 9A). Book lung apertures projected, oval, sclerotized (Figure 9B). Spinnerets: PMS length 0.20; PLS length 1.10, apical segment digitiform (Figure 9B).

Female: unknown.

Distribution.

Only known from its type locality, in the Central Cordillera of Colombian Andes, eastern flank, at 2750 m altitude, Caldas Department, Pensilvania, Berlín (Figure 10).

Etymology.

The species epithet parvum is a Latin adjective (neuter) which means little; S. parvum sp. n. is the smallest species of the genus known to date.