Stormtropis paisa, 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 paisa sp. n. Figures 7, 8

Type material.

Holotype male from Colombia, Antioquia, Santa Elena, Parque Ecoturístico Arví, Piedras Blancas, 12-iv-2017, 2400 m, col. C. Perafán, L. Montes de Oca, F. Pérez-Miles, J. Salazar, (ICN-Ar 11441). Paratypes: 3 females with the same data (ICN-Ar 11442-11443) (FC-My 1409).

Diagnosis.

Stormtropis paisa sp. n. differs from the other species of the genus by the presence of a sclerotized dark mark on proximal dorsal tibia, with a slight excavation (Figure 7A). Males additionally differ from the other species by the presence of a tibial apophysis bearing more numerous spines on the proximal row (12) (Figure 7D, E); in the other species with tibial apophysis the number of such spines is 5-6; and by the palpal bulb with the embolus sinuous, distally twisted and more widened on the apex (Figure 7F, G). Females can be distinguished by the morphology of the spermathecal receptacles with a tubular neck and a wide globose fundus (mushroom shaped) (Figure 8D).

Description.

Holotype male (ICN-Ar 11441) (Figure 7): total length 8.5; carapace length 3.9, width 4.0; abdomen length 4.7, width 2.7; chelicerae length 1.6. Color (in alcohol): body with soil particles encrusted; carapace, chelicerae, coxa, trochanter and femur reddish brown; abdomen dorsally and patella-tarsus brown, tibiae dorsally with a proximal dark brown mark. Carapace: glabrous, striae conspicuous, lateral margins with single line of curved setae mixed with dispersed clubbed setae; caput arched, with three longitudinal lines of plumose setae; caput slightly arched, separated from thoracic region by transverse shallow fovea, straight, width 0.7 (Figure 7A). Eyes and ocular tubercle: tubercle length 0.6, width 0.8, very elevated (height 0.6) and forwardly directed, with few stout setae. Clypeus absent. Anterior eye row slightly procurved, posterior slightly recurved. Ocular sizes and interdistances: AME 0.25, ALE 0.30, PME 0.20, PLE 0.25, AME-AME 0.10, AME-ALE 0.03, PME-PME 0.35, PME-PLE 0.03, ALE-PLE 0.05, AME-PME 0.03, ALE-ALE 0.50, PLE-PLE 0.48. Chelicerae: short sparse bristles on dorsal and lateral areas, long bristles on ventral and anterior area. Rastellum absent. Cheliceral furrow narrow, with two rows of teeth, 10 teeth on promargin, 10/9 teeth on retromargin. Fang long. Labium sub-trapezoid, length 0.90, width 0.50, with 33 elongated cuspules on anterior edge (Figure 7C). Labio-sternal groove wide. Maxillae longer than wide, with the anterior prolateral lobe very elongated, conical; with 35 elongated cuspules widely distributed throughout the prolateral half of the maxillae; field of cuspules wider proximally (Figure 7C). Sternum heart shaped with an anterior nodule, length 1.60, width 2.00; three pairs of sigillae, anterior and median subcircular, submarginal; posterior sigillae oval, marginal (Figure 7C). Anterior edge of sternum with a semicircular area slightly elevated (joined to labio-sternal groove) (Figure 7C).

Legs: cuticle with soil particles encrusted. Leg and palpal segments measurements provided in Table 7. Legs I slightly stouter than II-IV. Clubbed plumose and thorn-like setae. Trichobothria: filiform, on central 2/3 of tarsi, palp and all legs 5; on distal 1/4 of metatarsi, leg I 4, II–IV 3; on proximal 1/3 of tibiae, palp and legs I-III 5 in two rows (2/3 each), IV 4. Scopula absent, pseudoscopula slightly denser on tarsi I and II, sparse pseudoscopula setae on tarsi III and IV. 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, 15 distal and 12 proximal (Figure 7D, E). Thorn-like setae on tibiae, metatarsi, and tarsi of all legs, more dense on legs III and IV. Spines absent.

Palp: cymbium with two unequal lobes separated by a sclerotized groove; tibia with a distoventral groove. Palpal bulb pyriform elongated; embolus sinuous and distally twisted, long, tapering to the apex; a triangular translucent tooth on subapical region (Figure 7F, G).

Abdomen: oval, with seven transverse dorsal rows of 4-6 small clubbed setae; with smaller plumose clubbed setae, principally on posterior area (Figure 7A). Book lung apertures projected, oval, and sclerotized (Figure 7B). Spinnerets: PMS length 0.30; PLS length 1.4, apical segment digitiform (Figure 7B).

Female (ICN-Ar 11442) (Figure 8): total length 11.7; carapace length 4.8, width 4.6; abdomen length 6.4, width 4.0; chelicerae length 2.4. Color, coverage, and habitus as in male (Figure 8A, B). Eyes and ocular tubercle: tubercle length 0.7, width 1.0, very elevated (height 0.7) and forwardly directed, with setae. Clypeus absent. Anterior eye row slightly procurved, posterior recurved. Ocular sizes and interdistances: AME 0.25, ALE 0.33, PME 0.23, PLE 0.25, AME-AME 0.05, AME-ALE 0.05, PME-PME 0.43, PME-PLE 0.03, ALE-PLE 0.05, AME-PME 0.05, ALE-ALE 0.55, PLE-PLE 0.60. Chelicerae as in male. Rastellum absent. Cheliceral furrow with two rows of well-developed teeth, 12/7 teeth on promargin, 11/13 teeth on retromargin. Labium sub-trapezoid, length 0.6, width 1.2, with 53 cuspules on anterior edge (Figure 8A). Labio-sternal groove wide. Maxillae longer than wide, with the anterior prolateral lobe very elongated, conical; with 75/77 cuspules spaced, largely spread over prolatero-ventral border from the inner edge to anterior lobe. Sternum and sigillae as in male; sternum length 2.0, width 2.7 (Figure 8A).

Legs: cuticle as in male. Leg and palpal segments measurements provided in Table 7. Legs I clearly thicker than the others. Bristles, clubbed, thorn-like setae, and spines present. Trichobothria: filiform, on central 2/3 of tarsi, palp 5, legs I–II 5, III 4, IV 6; on distal 1/4 of metatarsi, leg I 4, II 3, III 4, IV 2; on proximal 1/3 of tibiae, palp 4, legs I-II two rows of 2 each, III two rows of 3 and 2 each, IV 4. Scopula and pseudoscopula absent. Claw tufts absent. Tarsal claws: ITC present on leg I; STC present on all legs with one tooth. Spination: principally thorn-like setae on all segments. Spines: palp 0; leg I fe 0, pa 0, ti 0, me 2v, 2pv, 4rv,1r, ta 4pv, 5rv; leg II fe 0, pa 0, ti 0, me 1pd, 2v, 1pv, ta 0; leg III fe 0, pa 0, ti 0, me 1pv, 1pd, ta 0; leg IV fe 0, pa 0, ti 0, me 1pv, ta 0.

Abdomen: book lung apertures and spinnerets as in male (Figure 8B). Two spermathecal receptacles with a tubular neck, ended in a globose flattened fundus; spermathecal fundus with higher density of glands than the neck (mushroom shaped, Figure 8D). Spinnerets: PMS length 0.40; PLS length 2.20, apical segment digitiform (Figure 8B).

Distribution.

Only known from its type locality, Central Cordillera of the Colombian Andes, Antioquia Department, Medellin (Santa Elena), at 2400 m altitude (Figure 10).

Etymology.

The species epithet paisa is a noun in apposition which means the vernacular name given to the people of Medellín, where the species occurs.