Soesilarishius elongatulus, Ruiz, Gustavo R. S. & Sobrinho, Adriana T., 2016

Ruiz, Gustavo R. S. & Sobrinho, Adriana T., 2016, Three new species and redescription of the type species of Soesilarishius Makhan, 2007 (Araneae: Salticidae: Euophryini), Zootaxa 4196 (2), pp. 250-260 : 259-260

Soesilarishius elongatulus sp. nov.

Figs 29‒37

Types. Holotype: Ƌ from Rio Acapu , Floresta Estadual do Trombetas , Oriximiná, Pará, Brazil, 01°06'10.10"S, 56°26'04.00"W, 10–18.X.2014, leg. M.B. Aguiar-Neto et al. ( MPEG 32013 ) . Paratype: 1 ♀ ( MPEG 32014 ), same data as holotype.

Additional material examined. BRAZIL: Pará: Oriximiná, Floresta Estadual do Trombetas , Rio Acapu (along about 25 km on the North margin, between 01°06'10.10"S, 56°26'04.00"W and 01°07'30.50"S, 56°19'05.50"W): 4 ♀, 10–18.X.2014, leg. M.B. Aguiar-Neto et al. ( MPEG 32017–32020 ).

Etymology. The epithet is to be treated as a Latin adjective, derived from elongatus (prolonged/removed), in allusion to the long embolus with relocated base, and the diminutive - ulus, due to the smaller body size in comparison to its syntopic congeners.

Diagnosis. The male is similar to those of S. micaceus and S. flagellator Ruiz, 2013 by the long embolus ( Fig. 33 ). It can be distinguished from that of S. flagellator by the shorter embolus and exposed embolar base ( Fig. 33 ), and from that of S. micaceus by the longer embolus (S-shaped in S. elongatulus sp. nov.; J-shaped in S. micaceus ). The female is similar to that of S. amrishi by sharing the thin initial portion of the copulatory duct leading to a large spermatheca ( Figs 11 , 36 ), but can be recognized by having the coupling pocket forming an inverted “U” ( Figs 35‒36 ) (divided into two pockets in S. amrishi ); it is also similar to that of S. micaceus by the coupling pocket and copulatory openings, but can be distinguished by the larger spermathecae.

Description. Male holotype (MPEG 32013). Total length: 2.07. Carapace dark brown, with tufts of white scales behind anterior and posterior eyes ( Fig. 29 ); 1.18 long, 0.87 wide, 0.63 high. Ocular quadrangle 0.63 long; anterior eye row 0.89 wide, posterior 0.76 wide. Chelicera, labium, endite and sternum dark brown ( Fig. 30 ). Palp brown, RTA slender and longer than in other congeners, pointing ventrally ( Fig. 34 ); small projection on distal prolateral part of tibia; membrane at embolar base forming “conductor” ( Fig. 33 ). Legs 3412; I–IV: femora, patellae and tibiae dark brown, metatarsi and tarsi yellow; patellae I–IV and tibiae III–IV with tufts of white scales ( Fig. 30 ). Length of leg I 1.92 (0.63 + 0.74 + 0.55); II 1.65 (0.55 + 0.57 + 0.53); III 2.01 (0.72 + 0.66 + 0.63); IV 1.99 (0.61 + 0.66 + 0.72). Abdomen dorsally dark brown, with two pairs of tufts of white scales, one anteriorly and second on middle, and third, median tuft on anal tubercle ( Fig. 29 ); laterally with pair of tufts of white scales on posterior half; dark brown ventrally ( Fig. 30 ). Spinnerets yellowish.

Female paratype (MPEG 32014). Total length: 2.80. Carapace yellow, with cephalic region black ( Fig. 31 ); 1.33 long, 1.00 wide, 0.71 high. Ocular quadrangle 0.67 long; anterior eye row 1.00 wide, posterior 0.86 wide. Chelicera, labium, endite, sternum and palp yellow ( Fig. 32 ). Legs 3142; I–III yellow; IV: femur yellow, patella with tuft of white scales, tibia brown with tuft of white scales, metatarsus proximally brown, distally yellow and tarsus yellow ( Fig. 32 ). Length of leg I 2.43 (0.81 + 1.00 + 0.62); II 1.95 (0.62 + 0.71 + 0.62); III 2.57 (0.86 + 0.90 + 0.81); IV 2.37 (0.71 + 0.76 + 0.90). Abdomen as in male, lighter; whitish ventrally ( Fig. 32 ). Epigyne with round copulatory openings, tube-shaped copulatory ducts and inflated C-shaped spermathecae ( Fig. 35 ). Spinnerets yellow.

Distribution. Known only from type locality ( Brazil, Pará).

Figures

FIGURES 29 – 32. Soesilarishius elongatulus sp. nov. 29 – 30 male (29 dorsal, 30 ventral); 31 – 32 female (31 dorsal, 32 ventral).

FIGURES 33 – 37. Soesilarishius elongatulus sp. nov. 33 – 34 left male palp (33 ventral, 34 retrolateral); 35 – 37 epigyne (35 ventral, 36 cleared, ventral, 37 cleared, dorsal).

FIGURES 5 – 11. Soesilarishius amrishi Makhan. 5 – 7 left male palp (5 ventral, 6 retrolateral, 7 prodorsal); 8 holotype male palp, modified after Makhan (2007: fig. 5); 9 – 11 epigyne (9 ventral, 10 cleared, ventral, 11 cleared, dorsal).