Chrysometa saci, 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 : 37-38

Chrysometa saci new species

Figures 3A–E

Type material. Holotype: Male from Serra do Tapirapecó (1,200 m), Barcelos (1°17'N 64º39'W), Amazonas, Brazil, X.2006, A.A. Nogueira & R. Braga-Neto coll. (INPA-AR 6156).

Paratypes: one male and six females from the same locality and date (INPA-AR 6157 (1 female), 6268 (2 females); IBSP 160490 (1 female), 160491 (1 male), 160492 (1 female), 160493 (1 female )).

Etymology. The species epithet is taken as a noun in apposition honoring mycologist Ricardo Braga-Neto, nicknamed “ Saci ”, for his help in the field throughout the Serra do Tapirapecó expedition.

Diagnosis. Males of C. saci differ from all other species of the genus by the paracymbial lower prong well developed, extending away from the palp in ventral direction (ventral and retrolateral views) ( Figs. 3A, B ); and the paracymbium with the paracymbial tip pointed retrolaterally with a horn shape, on ventral and retrolateral views ( Fig. 3A, B ). Males of C. saci are similar to C. cambara Levi, 1986 , figs.: 622, 623.

Females of C. saci differ from all other species by the vessel-shaped septum, with the posterior half membranous, on ventral view ( Fig. 3C ). The membranous area is partially covered by the lateral plates, creating a median groove with two humps on each side, on ventral and posterior views ( Figs. 3C, D ). Females of C. saci are similar to C. chica Levi, 1986 , figs. 382–385.

Description. Male (holotype). Carapace yellow, with cephalic region brown; Sternum, chelicerae, labium and endites brown. Legs yellow, with many dark spots. Dorsum of the abdomen grey, with white spots and some transversal black lines. Venter grey with a black longitudinal line on middle. Spinnerets grey. Total length 4.8; Carapace 2.4 long, 2.2 wide. Leg I length: femur 5.4; patella+tibia 6.7; metatarsus 6.1; tarsus 1.7. Patella+tibia II 4.5; III 1.8; IV 3. 0. Palp: Ecto-median cymbial process pointed ventrally, ecto-basal cymbial apophysis pointed retrolaterally ( Fig. 3B ).

Female (paratype, IBSP 160490). Colour as in male, with the venter of abdomen with a black, longitudial line on center with white spots around. Total length 6.3; Carapace 2.3 long, 2.0 wide. Leg I length: femur 3.3; Patella+tibia 4.0; metatarsus 3.0; tarsus 1.1. Patella+tibia II 3.1; III 1.5; IV 2. 4. Epigynum: internally with spermathecae apical, with copulation ducts coiled and basal openings of the ducts, near the septum ( Fig. 3E ).

Distribution. Only known from the type locality.

Figures

FIGURES 3 A – E. Chrysometa saci 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. 5 mm.