Masteria spinosa
Creators: name: Passanha, Victor
name: Brescovit, Antonio D.
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Dipluridae
Masteria
Masteria spinosa

description: Masteria spinosa (Petrunkevitch, 1925)
(Figs 25, 31A, 33)
Accola spinosa Petrunkevitch, 1925: 92; Chickering, 1945: 161, figs 1–8; 1966: 164, figs 12–13 (adult male).
Masteria spinosa: Nentwig, 1993: 94, fig. 47a–f.
Type. PANAMA: holotype, immature, San Lorenzo River, deposited in Peabody Museum, Yale, USA, not examined).
Additional material examined. PANAMA. Canal Zone, Barro Colorado Island (9°9’0”N; 79°51’0”W), 1♂, VIII.1928, A. M. Chickering (MCZ); 1♀, 12.II.1936, W. J. Gertsch (AMNH); 1 immature, XI.1952 – III.1953, J. Zetek (AMNH); 1♂, 03.III.1939, V. H. Dropkin (AMNH).
Diagnosis. Males of Masteria spinosa resemble those of Masteria simla, M. sabrinae n. sp. and M. galipote n. sp. in having a paraembolic apophysis, but differ in the elongated palpal bulb, with flattened paraembolic apophysis having a row of microspines on internal face (Fig. 25A–C). Females resemble those of those of M. simla and M. galipote n. sp. in the bilobed spermathecae with high ectal lobe and short ental lobe, but differ from M. simla in the ectal lobe with thick ducts on a large glandular region and from M. galipote n. sp. in the contiguous lobes of the spermathecae (Fig. 25F).
Description. Male (Panama, Barro Colorado, MCZ). Color: Carapace in dorsal view orange and in ventral view lighter than dorsally, legs yellowish and abdomen whitish. Total length 4.04. Carapace 1.84 long, 1.48 wide. Abdomen 2.20 long. Fovea 0.10. Clypeus 0.03. Ocular tubercle 0.26 long, 0.32 wide. Eyes: eight, posterior row strongly recurved. AME, 0.03, ALE 0.17, PME 0.08, PLE 0.14. Basal segment of chelicerae with 18 prolateral teeth, and 18 smaller mesobasal teeth. Labium 0.25 long, 0.30 wide. Sternum 0.90 wide, 1.05 long. Palp: femur 1.07/ patella 0.69/ tibia 1.04/ tarsus 0.41/ total 3.21; Legs I: femur 1.69/ patella 0.94/ tibia 1.66/ metatarsus 1.40/ tarsus 1.00/ total 6.69; II: 1.40/ 0.72/ 1.29/ 1.16/ 0.88/ 5.45; III: 1.35/ 0.63/ 1.16/ 1.25/ 0.82/ 5.21; IV: 1.75/ 0.75/ 1.72/ 1.72/ 0.94/ 6.88; Leg formula 4123; Spination: palp: femur p1, patella d1, p1, tibia r2; Legs I: femur p1, patella v1, tibia v1-1 -3ap, p1-3ap, r1ap, metatarsus p1b; II: femur p1, patella v1, p1-1, tibia v1-1 -3ap, p1-1-1, r1, metatarsus v1-1 -1-1, p1; III: patella p1, r1-1, tibia d1-1, v1-1 -1-3ap, p1-1-1, r1-1, metatarsus d1, v2-3 ap, p1-1, r1- 1-1; IV: femur r1, patella p1, r1, tibia d1-1, v1-1 -3ap, p1-1-1, r1-1, metatarsus d1-1-1-1, v2-3 ap, p1-1, r1-1. Tibia I: P1 short and tapered projected spur, P2 strong spine below P1 and P3, and P3 two spines sharing the same projected base. Metatarsus I with a flattened basal spur and a basal depression associated with with prolateral processes of tibia I (Figs 25E, 31A). Palpal tibia three times length of cymbium, basally dilated with 35–40 robust and elongated retrolateral median setae (Fig. 25D). Cymbium as wide as long with four apical spines. Palpal bulb piriform with elongated tegulum, embolus longer than paraembolic apophysis slighty curved, flattened, with distal torsion (Fig. 25A–C). PLS: basal and medial, apical lost, 0.62, 0.62 long.
Female (Same locality as male, AMNH). Color: carapace in dorsal view yellowish brown, carapace in ventral view and legs light yellow and abdomen whitish. Total length 4.80. Carapace 2.16 long, 1.80 wide. Abdomen 2.64 long. Fovea 0.10. Clypeus 0.04. Ocular tubercle 0.29 long, 0.34 wide. Eyes: 8, posterior row strongly recurved. AME 0.03, ALE 0.16, PME 0.08, PLE 0.14. Basal segment of chelicerae with 10 prolateral teeth and 18 smaller mesobasal teeth. Labium 0.22 long, 0.34 wide. Sternum 1.04 wide, 1.10 long. Palp: femur 1.16/ patella 0.63/ tibia 1.04/ tarsus 0.97/ total 3.80; Legs I: femur 1.97/ patella 1.04/ tibia 1.75/ metatarsus 1.44/ tarsus 1.04/ total 7.24; II: 1.59/ 0.75/ 1.25/ 1.16/ 0.79/ 5.54; III: 1.57/ 0.72/ 1.12/ 1.25/ 0.68/ 5.34; IV: 2.04; all segments of leg are missing, except femur; Leg formula 4123, inferred by femur length; Spination: palp: femur p2, patella d1b, p1, tibia d3-2-2- 2, v1-2 -1, p1, tarsus v1 b; Legs I: patella v1, tibia d3-2-2-2, v1-1 -1-1-3ap, p1-1, metatarsus v1-1 -1-3ap; II: patella v1, p1, tibia d1-1, v1-1 -1-1-2ap, p1-1-1-1, metatarsus v1-2 ap, p1-1; III: femur p1-1, patella v1,p1-1-1, r1, tibia v1- 1, v1-1 -1-3ap, p1-1, r1-1, metatarsus d1, v2-2 -3ap, p1-1, r1-1. Palpal claw with 22 teeth. Spermathecae bilobed, elongated ectal lobe and short ental lobe (Fig. 25F).
Distribution. Panamá (Fig. 33).
Note. The species were identified through the hypotype designated by Chickering (1945) and the illustration of a male palpal bulb from Chickering (1966). The specimens are damaged, apical segments of posterior lateral spinneret of the male, and all segments, except femur, of the leg IV and spinnerets of female were missing.
description: Published as part of Passanha, Victor & Brescovit, Antonio D., 2018, On the Neotropical spider Subfamily Masteriinae (Araneae, Dipluridae), pp. 1-73 in Zootaxa 4463 (1) on pages 44-46, DOI: 10.5281/zenodo.1441911