Chrysometa petrasierwaldae, Nogueira, André A., Pena-Barbosa, João P. P., Venticinque, Eduardo M. & Brescovit, Antonio D., 2011

Nogueira, André A., Pena-Barbosa, João P. P., Venticinque, Eduardo M. & Brescovit, Antonio D., 2011, The spider genus Chrysometa (Araneae, Tetragnathidae) from the Pico da Neblina and Serra do Tapirapecó mountains (Amazonas, Brazil): new species, new records, diversity and distribution along two altitudinal gradients, Zootaxa 2772, pp. 33-51 : 40

Chrysometa petrasierwaldae new species

Figures 5A–E

Type material. Holotype: Male from Pico da Neblina (2,400 m), São Gabriel da Cachoeira, (0°46'N 66º00'W), Amazonas, Brazil, X. 2007, A.A. Nogueira et al. coll. (INPA-AR 6150).

Paratype: six males and seven females from the same locality and date (INPA-AR 6151 (1 female), 6152 (1 female), 6153 (1 male), 6154 (1 male), 6155 (1 female); IBSP 160456 (1 female), 160458 (1 male), 160459 (1 female), 160463 (1 male); MPEG 15674 (1 female), 15676 (1 female), 15680 (1 male), 15681 (1 male )).

Additional material examined. Brazil: Amazonas: São Gabriel da Cachoeira, Pico da Neblina, (00°46'N 66º00'W), 33 males and 93 females, X. 2007, A.A. Nogueira et al., coll. (INPA-AR 6240-6267; IBSP 160457, 160460 - 160462, 160475, 160476; MPEG 15675, 15677-15679, 15683).

Etymology. The species epithet is a patronym in honor of arachnologist Petra Sierwald, for her contribuitions to the arachnological society and, also for her scientific contributions for the second author.

Diagnosis. Males of C. petrasierwaldae differ from all other species by the bifid cymbial apophysis, with rounded tips ( Fig. 5A ); conductor with a bifid tip, on retrolateral view ( Fig. 5B ). Males of C. petrasierwaldae are similar to C. nigroventris (Keyserling) Levi, 1986 , figs.: 145, 146.

Females of C. petrasierwaldae differ from all other species of the genus by median lobe projected posteriorly, with a “W”-shaped tip ( Fig. 5C ); copulatory openings ellipitical in ventral view ( Fig. 5C ); in posterior view, median lobe as an arch, enlarged on its basis ( Fig 5D ). Copulatory ducts large and apically twisted, with membranous spermathecae on dorsal view ( Fig. 5E ).

Description. Male (holotype). Carapace yellow, with a longitudinal black line on the thoracic region; sternum, chelicerae, labium and endites brown. Legs yellow, with many black spots. Dorsum of abdomen grey, with transversal black lines. Sides with white to silver spots. Venter black, with two white spots. Spinnerets black. Total length 2.4; Carapace 1.1 long, 0.9 wide. Leg I length: femur 1.7; Patella+tibia 2.1; metatarsus 1.8; tarsus 0.6. Patella+tibia II 1.2; III 0.6; IV 1. 0. Palp. Paracymbium subrectangular, with a cymbial membranous projection not so pronunciated as observed in C. waikoxi ( Fig. 5A ).

Female (paratype, INPA-AR 6151). Carapace yellow, with a single shield-shaped black spot on cephalic region. Chelicerae yellow. Labium, endites and sternum brown. Dorsum of abdomen grey with white spots and transversal black lines. Venter grey with two white spots. Total length 2.6; Carapace 1.0 long, 0.9 wide. Leg I length: femur 1.5; patella+tibia 1.8; metatarsus 1.3; tarsus 0.6. Patella+tibia II 1.1; III 0.6; IV 0.9. Epigynum: Lateral plates subrectangular ( Fig. 5D ); copulatory openings right below the median lobe, internally with copulatory ducts large and apically twisted; spermathecae as two hyaline balloons ( Fig. 5E ).

Distribution. Only known from the type locality.

Figures

FIGURES 5 A – E. Chrysometa petrasierwaldae n. sp. A. Male palp, ventral view. B. Same, retrolateral view. C. Epigynum, ventral view. D. Same, posterior view. E. Same, dorsal view. Scale bars: AB, 0. 3 mm; CDE, 0. 1 mm.