Masteria jatunsacha 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 : 542-544

Masteria jatunsacha Dupérré & Tapia , new species

Figs 2A, B , 3A–D , 20B , 22A , map. 1.

Type material. Male holotype from Napo Province, Ecuador, Jatun Sacha Natural Reserve (-01.666464 -77.617192) 400–430m, 10–15 Mar. 2020, pitfall, E.E. Tapia, N. Dupérré, A.A. Tapia ( QCAZ) . Paratypes: 2♂ same data as the holotype ( ZMH-A0014697 , QCAZ) .

Etymology. The specific name is a noun in apposition taken from the type locality Jatun Sacha Natural Reserve, Napo, Ecuador.

Diagnosis. Males most resemble M. chalupas n. sp. and M. papallacta n. sp. due to the presence of spines on the retrolateral side of the male palpal tibia but can be distinguished from M. papallacta n. sp. by the grouped spines positioned on the apical half ( Fig. 3B, C ), whilst they are positioned on the basal half in the latter species ( Fig. 9B, C ); from M. chalupas n. sp. by the presence of 21 grouped spines ( Fig. 3C ) vs. 14 grouped spines in the latter species ( Fig. 7B, C ) and basal spine of metatarsus I shorter ( Fig. 22A ), clearly longer in M. chalupas n. sp. ( Fig. 22B ).

Description. Male (holotype): Total length: 2.79; carapace length: 1.37; carapace width: 1.07; abdomen length: 1.42. Carapace yellow with reticulation in the cephalic groove and pars thoracica, covered with long setae ( Fig. 2A ). Chelicerae yellow; promargin with 11 teeth and ~10 smaller mesobasal teeth. Endites yellow without cuspules. Labium yellow without cuspules. Sternum yellow, covered with long setae ( Fig. 2B ). Eyes: six eyes grouped; AME absent; ALE the largest; PLE oval; PME small and oval; posterior row slightly recurved ( Figs 2A , 20B ). Abdomen elongated, uniformly beige covered with long setae ( Fig. 2B ). Spinnerets: PLS 1.15 (0.39/0.41/0.35). Legs coloration uniformly pale yellow. Leg formula 4123; leg measurements: I 4.44 (1.27/0.63/1.03/0.80/0.72); II 3.54 (1.02/0.43/0.81/0.69/0.59); III 3.38 (0.92/0.35/0.82/0.72/0.57); IV 4.55 (1.24/0.29/1.12/1.09/0.61). Leg spination: I: femur d1-1-1-1-1; tibia v1, p-1ap; metatarsus v1-1; II: femur d1-1-1-1-1, p1; patella v1, p1; tibia v1-1-1ap, p1; metatarsus v1-1-1; III: femur d1-1-1-1, p1; patella p1; tibia d1-1, v1-1-1-3ap, p1-1, r1-1; metatarsus d1-2, v2-2-3ap, p1, r1-1; IV: femur d1-1-1-1-1; patella v-1ap, r1; tibia d1, v2-1ap, p1-1-1, r1-1, metatarsus d1, v2-2-2ap, p1-1, r1-1- 1. Tibia I: P1 absent; P2 with an apical, narrow strong spine; P3 with two apical spines ( Fig. 22A ). Metatarsus I with small basal spine ( Fig. 22A ). Palp: palpal tibia 2x the length of cymbium, 2.6x longer than wide, with 21 grouped long spines on retrolateral side, positioned on apical half ( Fig. 3B, C ); cymbium 2x longer than wide, with four apical spines; bulb rounded, with laminar twisted embolus ( Fig. 3C ).

Female: unknown.

Distribution. Ecuador: only found at the type locality.

Natural History. Specimens were collected by pitfall between 400–430m in an evergreen lowland forest of the Napo-Curaray region ( Guevara et al. 2013b).

Figures

FIGURES 2A, B. Masteria jatunsacha n. sp. (holotype). A. Male habitus, dorsal view. B. Male habitus, ventral view. Scale bars: 0.5mm.

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 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.