Masteria chalupas Dupérré & Tapia, 2021

Dupérré, Nadine, Tapia, Elicio, Quandt, Dietmar, Crespo-Pérez, Verónica & Harms, Danilo, 2021, From the lowlands to the highlands of Ecuador, a study of the genus Masteria (Araneae, Mygalomorphae, Dipluridae) with description of seven new species, Zootaxa 5005 (4), pp. 538-568 : 546-549

Masteria chalupas Dupérré & Tapia , new species

Figs 6A, B , 7A–D , 20D , 22B , map 1.

Type material. Male holotype from Ecuador, Napo, Tena, Colonso Chalupas Biological Reserve (-00.9014 - 77.88588) 1048m, 9–15 Mar. 2020, pitfall trap, E.E. Tapia, N. Dupérré & A.A. Tapia ( QCAZ). Paratypes. 2♂ same data as holotype ( QCAZ, ZMH-A0013145 ); one 1♂ from Ecuador, Napo, Tena, Colonso Chalupas Biological Reserve (-00.9019 -77.88588) 1044m, 9–15 Mar. 2020, pitfall trap, E.E. Tapia, N. Dupérré & A.A. Tapia (ZMH- A0013146) .

Etymology. The specific name is a noun in apposition taken from the type locality Colonso Chalupas Biological Reserve, Napo, Ecuador.

Diagnosis. Males most resemble M. jatunsacha n. sp., and M. papallacta n. sp. but can be distinguished as such: from M. papallacta n. sp. by their twisted embolus ( Fig. 7B, D ) while straight in M. papallacta n. sp. ( Fig. 9B, C ); from M. jatunsacha n. sp. by the presence of 14 grouped spines on the retrolateral side of the male palpal tibia ( Fig. 7B, C ), while 21 grouped spines are present in the latter species ( Fig. 3C ), and the longer basal spine of metatarsus ( Fig. 22B ), shorter in M. jatunsacha n. sp. ( Fig. 22A ).

Description. Male (holotype): Total length: 1.97; carapace length: 1.04; carapace width: 0.74; abdomen length: 0.93. Carapace light yellow with reticulation in the cephalic groove and pars thoracica, covered with long setae ( Fig. 6A ). Chelicerae yellow; promargin with 10 teeth and ~9 smaller mesobasal teeth. Endites whitish without cuspules. Labium whitish without cuspules. Sternum whitish, covered with long setae ( Fig. 6B ). Eyes: six eyes grouped; AME absent; ALE the largest; PLE oval; PME the smallest, oval; posterior row recurved ( Figs 6A , 20D ). Abdomen elongated, uniformly beige covered with elongated setae ( Fig. 6B ). Spinnerets: PLS 0.69 (0.24/0.19/0.26). Legs coloration uniformly pale yellow. Leg formula 4123; leg measurements: I 2.64 (0.73/0.46/0.62/0.42/0.41); II missing; III 1.95 (0.56/0.27/0.37/0.41/0.34); IV 2.72 (0.79/0.26/0.64/0.60/0.43). Leg spination: I: femur d1-1-1-1-1; metatarsus v1; II missing; III: femur d1-1-1-1, p1; patella p1; tibia d1-1, v1-1-1-3ap, p1-1, r1-1; metatarsus d1-2, v2-2ap, p1, r1-1; IV: femur d1-1-1-1-1; patella v-1ap, r1; tibia v2-1ap, p1-1-1, r1-1, metatarsus v1-1-2ap, p1-1. Tibia I: P1 absent; P2 with an apical, narrow strong spine; P3 with two apical spines ( Fig. 22B ). Metatarsus I with elongated basal spine ( Fig. 22B ). Palp: palpal tibia 1.6x the length of cymbium, 2.6x longer than wide, with 14 grouped long spines on retrolateral side, positioned on apical half ( Fig. 7 A-C); cymbium 2x longer than wide, with four apical spines; bulb constricted, with laminar twisted embolus ( Fig. 7C ).

Female: unknown.

Distribution. Ecuador: only found at the type locality.

Natural History. Specimens were collected by pitfall trap between 1044–1048m in an evergreen piemontane forest of the northern part of the oriental Andean mountain range ( Guevara et al. 2013a).

Figures

FIGURES 3A–D. Masteria jatunsacha n. sp. (holotype). A. Male palp, prolateral view. B. Male palp, retrolateral view. C. Male palpal bulb, prolateral view. D. Male leg I, prolateral view. Scale bars: 0.1mm.

FIGURES 6A, B. Masteria chalupas n. sp. (holotype). A. Male habitus, dorsal view. B. Male habitus, ventral view. Scale bars: 0.5mm.

FIGURES 7A–D. Masteria chalupas n. sp. (holotype). A. Male palp, prolateral view. B. Male palp, retrolateral view. C. Male palpal bulb, prolateral view. D. Male leg I, prolateral view. Scale bars: 0.1mm.

FIGURES 9A–9D. Masteria papallacta n. sp. (holotype). A. Male palp, prolateral view. B. Male palp, retrolateral view. C. Male palpal bulb, prolateral view. D. Male leg I, prolateral view. Scale bars: 0.1mm.

FIGURES 20A–H. Cephalothorax, dorsal view. A. Masteria hirsuta L. Koch, 1873 (female holotype). B. Masteria jatunsacha n. sp. (male holotype). C. Masteria machay n. sp. (female holotype). D. Masteria chalupas n. sp. (male holotype). E. Masteria papallacta n. sp. (male holotype). F. Masteria papallacta n. sp. (female allotype). G. Masteria pasochoa n. sp. (male holotype). H. Masteria pasochoa n. sp. (female allotype).

FIGURES 22A–C. Prolateral processes of leg I, male. A. Masteria jatunsacha n. sp. (holotype). B. Masteria chalupas n. sp. (holotype). C. Masteria papallacta n. sp.