Actinopus uruguayense, Duniesky, 2019

Duniesky, Rios-Tamayo, 2019, Four new species of Actinopus (Mygalomorphae: Actinopodidae) from Uruguay, Zootaxa 4624 (4), pp. 523-538 : 533-536

Actinopus uruguayense sp. nov.

( Figures 8 , 9 , 10 )

urn:lsid:zoobank.org:act:746E9BD4-D7FD-4CA9-AFB4-6C0AF6D89EE6

Type material: Uruguay: Colonia. Holotype ♂: J. Lacaze, Rincón del Sauce [34°25′S 57°26′W], 12 February 1978, J. Blengini ( MNHN 1332 ) . Paratype ♀: Uruguay, Same locality and collector, 20 November 1979 ( MNHN 1318 ) .

Other material examined. Uruguay: Maldonado, Balneario Solís [34°47′S 55°23′W], 3 June 1978 , A.R.M.

Geep, 1♂ (MNHN 1344); Cerro Largo: Ruta 8, Río Tacuarí [32°46′S 53°18′W], 15 April 1965, F. Achaval, 1♂ (MNHN 627).

Etymology. The specific name refers to the country Uruguay.

Diagnosis. Females of A. uruguayense can be recognized by the shape of their spermathecae ( Fig. 9E ), with two irregular lobes. Males can be differentiated from those of all other species in Uruguay by their rastellum hav- ing cuspules (similar to that of A. gerschiapelliarum, A. fernandezi, A. insignis and A. puelche). Males and females differ from those of A. insignis and A. puelche by the sternum center having a slight depression and from those of A. gerschiapelliarum by the absence of spiniform bristles on the dorsal femur III and from A. fernandezi by the copulatory bulb shape ( Fig. 8 H–J).

Description. ( Fig. 8 ). Male holotype (MNHN 1332). Total length: 10.10. Carapace ( Fig. 8A ): length 4.80, width 4.80; cephalic region: length 2.70, width 3.50; clypeus small, a central bristle and 6 on each side, 12 bristles between PME, 4 behind each PME-PLE, 7 bristles and one larger on both sides of ocular group. Fovea: length 1.20, width 2.00. Eyes, diameters and interdistances: AME 0.26 (large), ALE 0.32, PME 0.16, PLE 0.32, ocular group length 0.90, anterior width 2.60, 2.38 posterior width; AME-ALE 0.69, PME-PLE 0.16, AME-PME 0.37, ALE-PLE 0.42, AME-AME 0.21. Chelicerae: length 2.60, width 1.30; cheliceral apex with 11 recumbent and elongated bristles over fang base. Rastellum with 10 marginal blunt spines, and 4 small dorsal (attenuated). Cheliceral furrow ( Fig. 8C ) with 6 large promarginal (a small one between 2nd–3rd), 5 retromarginal teeth (small one between 3th–4th) and 12 denticles, near promarginal teeth. Labium: length 0.90, width 0.90. Maxillae: anterior length 1.20, posterior length 2.10, width 1.40. Sternum: Center with slight depression ( Fig. 8B ): length 3.50, maximum width 3.00, minimum width 0.90. Postlabial sigilla shallow deep; posterior sigilla well defined. Abdomen: length 5.30, covered by long bristles. PMS: length 0.58; PLS with basal: medial: apical articles of lengths 0.58:0.31:0.26. Spigots: 1 large, 20 small on PMS; PLS numbers of large(small) spigots on basal: medial: apical article 5(20):5(25):2(40). Lengths of legs and palp: I: 5.50, 2.30, 3.30, 4.00, 2.30, 17.40. II: 5.30, 2.20, 3.30, 4.00, 2.30, 17.10. III: 3.90, 2.30, 2.20, 4.20, 2.50, 15.10. IV: 5.50, 2.50, 4.00, 4.40, 2.28, 18.68. Palp: 6.00, 2.60, 5.00,–, 1.30, 14.40. Chaetotaxy: Femora: I–IV, 0. Patellae: I–II: 0; III, 37 P SUP-D ANT + 8 on the margin, 1-1 D B, 6 R A + 8 on the margin; IV, 45 P SUP-D ANT. Tibiae: I, 1-0-1- 1 V POST, 1-2-2-1- 3 V; II, 1-2-1-2-1-4-1 R, 1-2- 3 V (1:2 A); III, 1 D (1:2 B), 1-1 R 1:2 A), 1- 4 V (1:3 A), with apical crown of 18 thorns; IV, 1 P, 1-1- 3 V. Metatarsi: I, 1-1-1-1-1 P INF, 1-1-1-0-1-1-2 R INF, 2-2-2-1-0- 1 V; II, 2-1-2-2 P INF (1/2 A), 1-1-1-1-2-1-2-2-4-3 R INF, 1-2-1-2-3-2-1- 2 V; III, 2-1-1-1-2 R, 11-1-1-3- 4 V; IV, 1-1-1-1-1-2 P INF, 1-1-2-1- 4 V. Tarsi: I, 1-1-1-1-1 P INF, 13 R INF, 1 V A; II, 10 P INF, 25 R INF, 1 V A; III, 1/0 P INF, 1-1-1 R INF; IV, 9 P INF, 5 R INF. Total number of retrolateral spines on tibiae I and II ( Fig. 8G ): 0 and 12, respectively. Palp: tibiae long, thin ( Fig. 8F ). Bulb ( Fig. 8 H–J) with ATA and BTA developed, embolus with Ak extended to apex and MRk, and series of denticles at base. Scopulae: Tarsi: I–II sparse; III–IV, dense and uniform. Metatarsi: 0. Trichobothria: Tibiae: I 4-3; II 4-5; III–IV 4-3. Metatarsi: I 12; II 10; III 8; IV 6. Tarsi: I–II 8; III 7; IV 5. Color: carapace reddish brown; cephalic region, legs and chelicerae dark reddish brown. Abdomen brown; booklungs with dark markings ( Fig. 8D, E ). Sternum, labium and maxillae lighter reddish brown. Spinnerets light yellow. Palp with lighter tibiae.

Female paratype (MNHN 1318). Total length: 22.00. Carapace ( Fig. 9A ): length 7.50, width 7.50; with 10 bristles on each lobe of posterior margin; cephalic region: length 4.40, width 6.30; clypeus small with 35 bristles, 13 on chilum; 33 bristles between PME-PME and 14 behind each PME-PLE, 15 bristles and one larger on both sides of ocular group. Fovea: length 1.40, width 3.50. Eyes, diameters and interdistances: AME 0.21, ALE 0.53, PME 0.26, PLE 0.32, ocular group 1.48, anterior width 4.50, 3.92 posterior width; AME-ALE 1.43, PME-PLE 0.31, AME-PME 0.79, ALE-PLE 0.95, AME-AME 0.32. Chelicerae: Length 3.00, width 2.50, chelicerae apex with 14 recumbent and elongated bristles over fang base. Rastellum with 18 marginal, blunt spines and 14 small dorsal. Cheliceral furrow ( Fig. 9C ) with 6 promarginal and 6 retromarginal teeth (small one between 3th–4th and 4th–5th) and 12 denticles in furrow, near promargin. Labium: length 1.20, width 1.60, with 28 anterior cuspules. Maxillae: anterior length 2.00, posterior length 2.25, width 2.00, with + 100 cuspules 1: 3 V ANT, expanding to anterior face. Sternum: Center with slight depression (Fig, 9B): length: 5.70, maximum wide 4.70, minimum width 1.60. Postlabial sigilla deep, posterior sigilla shallow and well defined. Abdomen: length 13.00, covered by small dark bristles. PMS: length 0.79; PLS with basal: medial: apical articles 1.06:0.26:0.21. Spigots: 2 large, 40 small on PMS; PLS, numbers of large(small) spigots on basal: medial: apical article 10(55):7(30):2(~50). Lengths of legs and palp: I: 4.00, 3.00, 1.90, 2.50, 1.20, 12.60. II: 4.20, 3.00, 1.50, 2.80, 1.00, 12.50. III: 4.00, 3.20, 1.20, 3.00, 1.00, 12.40. IV: 5.50, 3.50, 2.80, 3.20, 1.00, 16.00. Palp: 3.80, 2.30, 2.70,–, 2.70, 11.5. Chaetotaxy: All femora: 0. Patellae: I, II, 0; III, 16 P A + 12 on margin, 32 R A + 14 on margin; IV, 100 P SUP-D ANT; palp, 1-1-1- 1 p. Tibiae: I, 10 R; II, 83 R, 1-1- 1 V POST; III, 1 D B, with apical crown of 25 thorns and 5 apical (at apex, anterior to crown), 52 R; IV, 0; palp, 1-1-1 P INF (1:2 A series), 1-1-1-1 p, 22 R INF. Metatarsi: I, 17 P INF, 1-1- 2 V POST, 19 R INF; II, 8 P INF (1:2 A), 1-1- 2 V POST, 9 R INF; III, 28 D ANT-P SUP, 45 on row D POST-R (more abundant R A); IV, 16 P INF, 1 D A. Tarsi: I, 9 P INF (series), 9 R INF, 2 V A; II, 11 P INF, 8 R INF, 1 V A; III, 18 R, 70 V-P; IV, 66 V-P; palp, 22 P, 25 R INF, 1 V A. Total number of retrolateral spines on tibiae I, II ( Fig. 9D ): 10 and 83, respectively. Trichobothria: Tibiae: I 5-4; II 7-6; III 4-6; IV 5-5. Metatarsi: I 12; II 13; III 9; IV 8. Tarsi: I 9; II 11; III 10; IV 8. Color: carapace, cephalic region and legs reddish brown, darker chelicerae. Abdomen light brown; booklung with light markings. Sternum light reddish brown, darker labium and maxillae. Spinnerets yellow.

Distribution. Western and eastern Uruguay ( Fig. 10 ).

Figures

FIGURE 8. Actinopus uruguayense sp. nov., (male holotype, Rincón del Sauce, MNHN 1332). A cephalothorax, dorsal view; B sternum, ventral view; C cheliceral furrow, denticles distribution; D right palp, retrolateral view; E right tibia II, retrolateral view; F abdomen, dorsal view; G abdomen, ventral view; H–J copulatory bulb, three different views. Scale bars: 1mm.

FIGURE 9. Actinopus uruguayense sp. nov., (female paratype, Rincón del Sauce, MNHN 1318). A cephalic region, dorsal view; B sternum, ventral view; C cheliceral furrow, denticles distribution; D right tibia II, retrolateral view; E spermathecae. Scale bars: 1mm.

FIGURE 10. Known distribution of Actinopus species in Uruguay.Additional records (in Argentina) for A. gerschiapelliarum, A. insignis, A. longipalpis and A. puelche, are given in Ríos-Tamayo & Goloboff (2018, figs 44, 45).