Guadana muirapinima, Rheims, 2021

Rheims, Cristina A., 2021, The Neotropical genera Guadana Rheims, 2010 and Sparianthina Banks, 1929 (Araneae: Sparassidae: Heteropodinae), Zootaxa 5061 (3), pp. 401-431 : 411-419

Guadana muirapinima sp. n.

Figs 43−56 , 60 , 70

Type material: Holotype: ♂, from BRAZIL: Pará: Juruti, Beneficiamento , ponto 1 (-2.5076, -56.1776), 7 January 2012, E.G.S. Cafofo Silva leg. ( MPEG 30837 ) . Paratypes: BRAZIL: Pará: 1♀, Juruti, Platô Capiranga , linha 168E (-2.4728, -56.2082), 9 February 2007, N.F. Lo Man Hung leg. ( MPEG 30688 ) ; 1♀, Juruti (-2.4643, -56.0024) ( MPEG 30677 ) .

Etymology. The specific name refers to the original inhabitants of the margins of the old Juruti Lake, currently the oldest part of the city of Juruti. It is also the name of a tree of good solid timber, that is common to the region; noun in apposition.

Diagnosis. Males of G. muirapinima sp. n. are distinguished from all other congeners by the palp with embolus bearing a bifid basal projection, with one branch long, distally widened and tapering towards tip and one shorter, distally semi-rounded branch ( Figs 44 , 70 ). Females resemble those of S. mapia sp. n. and S. urucu by the epigyne with MS bearing single epigynal pocket ( Figs 29 , 46 , 79 ). They are distinguished from the latter species by the pocket much wider than long (as long as wide, or longer than wide in the latter species) ( Figs 46 , 55 ).

Description. Male (holotype): Prosoma brownish orange with two irregular pale brown marks at the base of cephalic region and reticulated marks along lateral margins and between thoracic striae; fovea and thoracic striae pale brown; eye borders black. Chelicerae, legs and palps yellowish orange with gray marks at the base of striae and setae. Labium brown, distally pale brown. Endites pale yellowish orange, distally pale yellow. Sternum pale yellow with pale brown margins. Opisthosoma yellowish gray; dorsally with pale yellow marks laterally and pair of rounded, brown muscle impressions; ventrally with two lines of curved muscle impressions. Spinnerets yellowish cream colored ( Figs 48−49 ). Total length 6.5. Prosoma: 3.2 long, 3.0 wide. Opisthosoma: 3.2 long, 2.3 wide. Eyes: diameters: 0.24, 0.23, 0.15, 0.26; interdistances: 0.10, 0.03, 0.33, 0.30, 0.26, 0.23. Legs (2143): I: 23.2 (6.0, 1.7, 6.9, 6.3, 2.3); II: 26.1 (6.8, 1.7, 7.7, 7.4, 2.5); III: 16.1 (4.6, 1.2, 4.4, 4.4, 1.5); IV: 18.7 (5.1, 1.1, 4.9, 5.6, 2.0). Palp: vRTA reduced to a small bump on tibia; dRTA concave, distally widened with medially depressed tip; DTA roughly straight, abruptly narrowed at tip; small tegular projection present close to embolus base; conductor hyaline, same width throughout its entire length; embolus filiform, strongly curved prolaterally ( Figs 43−45 , 52−54 ; 60 , 70 ).

Female (MPEG 30677): Coloration pattern as in male, slightly lighter ( Figs 50−51 ). Total length 6.7. Prosoma: 3.1 long, 3.1 wide. Opisthosoma: 3.5 long, 2.9 wide. Eyes: diameters: 0.17, 0.21, 0.13, 0.24; interdistances: 0.20, 0.06, 0.31, 0.32, 0.30, 0.30. Legs (2143): I: 16.9 (4.8, 1.7, 5.0, 4.0, 1.4); II: 18.5 (5.3, 1.8, 5.5, 4.4, 1.5); III: 12.9 (4.0, 1.2, 3.4, 3.1, 1.2); IV: 14.5 (4.2, 1.1, 3.7, 4.0, 1.5). Epigyne: epigynal field as wide as long; MS as wide as long, widest anteriorly; epigynal pocket seven times wider than long ( Figs 46 , 55 ). Vulva: internal ducts running anteriad from CO, then posteriad towards SP; SP U-shaped; FD short, anteriad ( Figs 47 , 56 ).

Variation. Females (n = 2): total length 6.7−7.6; prosoma length 3.1−3.5; femur I length 4.8−5.0.

Distribution. Only known from the type locality in Brazil ( Fig. 81 ).

Figures

FIGURES 43−47. Guadana muirapinima sp. n. 43−45 male (MPEG 30837), left palp (43 prolateral, 44 ventral, 45 retrola- teral); 46−47 female (MPEG 30677) (46 epigyne ventral, 47 vulva dorsal). Scale lines: 1 mm. C—conductor; CO—copulatory opening; dRTA—dorsal branch of RTA; DTA—dorsal tegular apophysis; E—embolus; ep—epigynal pocket; FD—fertiliza- tion duct; LL—lateral lobe; MS—median septum; SP—spermathecae; tp—tegular projection; vRTA—ventral branch of RTA; VTA—ventral tibial apohysis.

FIGURES 48−51. Guadana muirapinima sp. n. 48−49 male (MPEG 30837), habitus (48 dorsal, 49 ventral); 50−51 female (MPEG 30677), habitus (50 dorsal, 51 ventral). Scale lines: 2 mm.

FIGURES 52−56. Guadana muirapinima sp. n. 52−54 male (MPEG 30837), left palp (52 prolateral, 53 ventral, 54 retrola- teral); 55−56 female (MPEG 30677) (55 epigyne ventral, 56 vulva dorsal). Scale lines: 1 mm.

FIGURES 57−66. Male, left palp, DTA, ventral, detail. 57 Guadana alpahuayo sp. n., 58 Guadana arawak sp. n., 59 Guadana manauara, 60 Guadana muirapinima sp. n., 61 Guadana neblina, 62 Guadana panguana, 63 Guadana quillu, 64 Guadana tambopata, 65 Guadana ucayali sp. n., 66 Guadana urucu. Scale lines: 1 mm. rm—ridged margin; vk—ventral keel.

FIGURES 67−76. Male, left palp, embolus, ventral, detail. 67 Guadana alpahuayo sp. n., 68 Guadana arawak sp. n., 69 Guadana manauara, 70 Guadana muirapinima sp. n., 71 Guadana neblina, 72 Guadana panguana, 73 Guadana quillu, 74 Guadana tambopata, 75 Guadana ucayali sp. n., 76 Guadana urucu. Scale lines: 1 mm. bp—basal projection of the embolus; sk—subdistal keel.

FIGURES 29−33. 29−30 Guadana mapia sp. n. female (IBSP 8825) (29 epigyne ventral, 30 vulva dorsal). 31−33 Guadana ucayali sp. n. male (MUSM), left palp (31 prolateral, 32 ventral, 33 retrolateral). Scale lines: 1 mm. bp—basal projection of the embolus; C—conductor; CO—copulatory opening; dRTA—dorsal branch of RTA; DTA—dorsal tegular apophysis; E—embo- lus; ep—epigynal pocket; FD—fertilization duct; LL—lateral lobe; MS—median septum; SP—spermathecae; vRTA—ventral branch of RTA; VTA—ventral tibial apophysis.

FIGURES 77−80. Female, epigyne. 77 Guadana manauara, 78 Guadana quillu, 79 Guadana urucu, 80 Guadana tambopata. Scale lines: 1 mm. el—epigynal ledge; LL—lateral lobe; MS—median septum; ufl—U-shaped flap of median septum. Illustra- tions modified from Rheims 2010a (internal structures visualized by transparency are omitted).

FIGURES 81−82. Distribution maps for Guadana spp. 81 (Guadana alpahuayo sp. n., Guadana amendoim sp. n., Guadana arawak sp. n., Guadana manauara, Guadana mapia sp. n., Guadana muirapinima sp. n.); 82 (Guadana neblina, Guadana panguana, Guadana quillu, Guadana tambopata, Guadana ucayali sp. n., Guadana urucu).