Masteria downeyi ( Chickering, 1966 )

Passanha, Victor & Brescovit, Antonio D., 2018, On the Neotropical spider Subfamily Masteriinae (Araneae, Dipluridae), Zootaxa 4463 (1), pp. 1-73: 25-27

publication ID

http://doi.org/ 10.5281/zenodo.1441911

publication LSID

lsid:zoobank.org:pub:20E7F0F5-7592-47CE-B67F-36DE0124E76F

persistent identifier

http://treatment.plazi.org/id/03D95431-A228-8E79-FF36-4A7CFD1A7A05

treatment provided by

Plazi

scientific name

Masteria downeyi ( Chickering, 1966 )
status

 

Masteria downeyi ( Chickering, 1966) 

( Figs 14View FIGURE 14, 29FView FIGURE 29, 32View FIGURE 32)

Accola downeyi Chickering, 1966: 158  , figs 1–5.

Masteria downeyi: Brignoli, 1983: 126  .

Type. COSTA RICA. ♂ holotype, Turrialba (9°54’0”N; 83°41’0”W), Cartago, 25.VII-15.VIII.1965, A.M. Chickering leg., deposited in MCZ, examined)GoogleMaps 

Additional material examined. COSTA RICA. Guanacaste: Tilarán (10°26’0”N; 85°24’ 0”W), 1♂, 14.VII.1966, S. Peck leg. ( AMNH); Cato, 1♂, 22.VII.1957, E. Dixon leg. ( AMNH); Quepos: Manuel Antonio National Park (9°22’32”N; 84°8’9”W), 1 immature, Charles & M. Goodnight leg. ( AMNH)GoogleMaps  ; PANAMA. Chiriqui: Tierras Altas, El Volcán (8°46’12”N; 82°37’48”W), 1♀, 14.VIII.1950, A. M. Chickering leg. ( MCZ 140View Materials); Cerro Punta (8°51’0”N; 82°34’0”W), 1♀, 04.III.1936, W. J. Gertsch leg. ( AMNH).GoogleMaps 

Diagnosis. Males of Masteria downeyi  are similar to those of M. colombiensis  , M. lewisi  , M. yacambu  n. sp., M. amarumayu  n. sp., M. mutum  n. sp. and M. aguaruna  n. sp. in the palpal bulb piriform ( Fig. 14BView FIGURE 14). They differ from M. colombiensis  , M. yacambu  n. sp., M. amarumayu  n. sp. and M. mutum  n. sp. in having a group of thick and elongated setae medially on the palpal tibia ( Fig. 14DView FIGURE 14), from M. lewisi  in the long embolus, and from M. aguaruna  n. sp. in the cylindrical embolus tip ( Fig. 14CView FIGURE 14) and short BS ( Figs 14EView FIGURE 14, 29FView FIGURE 29). Females differ from those of the other species of the genus in having bilobed spermathecae, with the ectal lobe very small and the ental one globose ( Fig. 14FView FIGURE 14).

Description. Male ( Costa Rica, Guanacaste, Tilaran, AMNH). Color: Carapace in dorsal view yellowish and in ventral view slightly lighter, legs yellowish and abdomen whitish. Total length, 3.50. Carapace 1.75 long, 1.28 wide. Abdomen 1.75 long. Fovea 0.07. Clypeus 0.03. Ocular tubercle 0.20 long, 0.26 wide. Eyes: six, posterior row recurved ( Fig. 14AView FIGURE 14). AME absent, ALE 0.14, PME 0.06, PLE 0.11. Basal segment of chelicerae with 11 prolateral teeth, and 10 smaller mesobasal teeth. Labium 0.18 long, 0.32 wide. Sternum 0.81 wide, 0.84 long. Palp: femur 1.05/ patella 0.57/ tibia 1.00/ tarsus 0.50/ total 3.12; Legs I: femur 1.46/ patella 0.59/ tibia 1.37/ metatarsus 0.90/ tarsus 0.81/ total 5.13; II: 1.21/ 0.59/ 0.96/ 0.87/ 0.68/ 4.31; III: 1.15/ 0.53/ 0.90/ 0.96/ 0.78/ 4.32; IV: 1.59/ 0.65/ 1.40/ 1.25/ 0.87/ 5.76; Leg formula 4123; Spination: Legs I: tibia v1-1 -1, p1-3ap, metatarsus p1b; II: tibia v1-1 - 1ap, p1, metatarsus v1-1 -1, p1; III: patella v1-1, r1, tibia v1-1 -2ap, r1-1-1, metatarsus v1-1 -3ap, p2-1, r1; IV: patella p1, r1, tibia d1, v1-1 -1-3ap, p1-1, r1-1-1, metatarsus v1-2 -1-3ap, p1-1-1, r1. Tibia I: P1 a rounded projected spur, P2 a strong spine slightly below other two processes and P3 two spines on the same base. Metatarsus I with flattened basal spine and basal depression associated with prolateral processes of tibia I ( Figs 14EView FIGURE 14, 29EView FIGURE 29). Palpal tibia twice length of cymbium with group of 15–20 thick and elongated setae on retrolateral medial area ( Fig. 14DView FIGURE 14). Cymbium as long as wide with four apical spines. Palpal bulb piriform with short embolus, half length of tegulum, with slight curvature ( Fig. 14B –CView FIGURE 14). PLS: basal, medial and apical 0.64, 0.52, 0.52 long. Medial and apical segments of female posterior lateral spinnerets were missing due to specimen damage.

Female (MCZ-140). Color: Carapace orange, legs and abdomen yellowish. Total length 4.51. Carapace 2.22 long, 1.82 wide. Abdomen 2.29 long. Fovea 0.10. Clypeus 0.06. Ocular tubercle 0.22 long, 0.34 wide. Eyes: six, posterior row recurved. AME absent, ALE 0.15, PME 0.08, PLE 0.12. Basal segment of chelicerae with 11 prolateral teeth, and 10 smaller mesobasal teeth. Labium 0.32 long, 0.47 wide. Sternum 1.00 wide, 1.07 long. Palp: femur 1.31/ patella 0.69/ tibia 1.16/ tarsus 1.13/ total 4.29; Legs I: femur 1.87/ patella 0.88/ tibia 1.63/ metatarsus 1.22/ tarsus 1.00/ total 6.60; II: 1.54/ 0.88/ 1.16/ 1.04/ 0.84/ 5.46; III: 1.47/ 0.75/ 1.16/ 1.19/ 0.79/ 5.36; IV: 1.91/ 0.88/ 1.72/ 1.57/ 0.84/ 6.92; Leg formula 4123; Spination: palp: tibia v1, tarsus v1 b; Legs I: metatarsus v1 ap; II: metatarsus v1-1 -1, p1; III: patella p1-1, r1, tibia v1-1 -1-3ap, p1-1, r1-1, metatarsus d1, v2-2 -3ap, p1-1, r1; IV: patella r1, tibia v1-1 -1-3ap, p1-1, r1-1-1, metatarsus v2-2 -3ap, p1-1, r1-1. Palpal claw with 15 teeth. PLS: basal 1.15, medial and apical lost. Spermathecae bilobed, with ental lobe on a wide glandular region ( Fig. 14FView FIGURE 14).

Variation. 2 males: total length 3.50–4.00. 3 females: total length: 3.90–4.51.

Distribution. Costa Rica and Panama ( Fig. 32View FIGURE 32).

MCZ

Museum of Comparative Zoology

AMNH

American Museum of Natural History

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Dipluridae

Genus

Masteria

Loc

Masteria downeyi ( Chickering, 1966 )

Passanha, Victor & Brescovit, Antonio D. 2018
2018
Loc

Accola downeyi

Chickering, 1966 : 158