Nativus napo, Casas & Rheims, 2023

Casas, Cristian M. & Rheims, Cristina A., 2023, Nativus gen. nov., a new huntsman spider genus from South America (Araneae: Sparassidae: Heteropodinae), Zootaxa 5360 (1), pp. 1-43 : 20-23

Nativus napo sp. nov.

Figs 65−79

Type material: Holotype: PERU: Loreto: ♂, Maynas, Rio Napo (-1.8703, -74.7904, 200 m), 11 January 2009, W. Yawaromi leg. ( MUSM ENT-505866 ) . Paratypes: PERU: Loreto: 1♂, from the same vial as holotype ( MUSM ENT-505866 ) ; 1♂, 2 juv., Estirón [-3.3166, -71.8500], Río Ampiacu , 13 November−9 December 1961, B. Malkin leg. ( AMNH) ; 1♀, Pebas, Río Amazonas (-3.1333, -71.8167), 12−15 April 1977, C.W. Myers leg. ( AMNH) .

Etymology. The specific name refers to the type locality; noun in apposition.

Diagnosis. Males of N. napo sp. nov. resemble those of N. janai sp. nov. ( Figs 39−41 ) and N. yurupari sp. nov. ( Figs 136−138 ) by the tegulum with large triangular RdP, at least 1.5 times longer than wide and E sinuous in the male palps. It is distinguished from both species by the palps with dRTA single and distally truncated ( Figs 75−76 ) (bifid in both latter species). Females resemble those of N. yurupari sp. nov. ( Figs 139−141 ) by the MS diamond shaped, anterior to fused part of LL. They are distinguished from the latter species by the fused part of LL extending until 1/3 of EF length and MS roughly as wide as long ( Fig. 77 ) (fused part of LL extending until almost half EF length and MS two times longer than wide in the latter species).

Description. Male (holotype): Specimen slightly dried out. Prosoma brown, darker along thoracic striae; fovea dark brown; eye borders black. Chelicerae legs and palps pale brown. Endites pale brown, distally slightly lighter. Labium brown, distally pale brown. Sternum pale brown with darker brown margins. Opisthosoma brownish gray; dorsally with one pair of rounded muscle impressions. Ventrally with two V-shaped lines of muscle impressions. Spinnerets brownish gray ( Figs 65−66 ). Total length 7.0. Prosoma: 3.7 long, 3.3 wide. Opisthosoma: 3.1 long, 1.6 wide. Eyes: diameters: 0.26, 0.24, 0.20, 0.28; interdistances: 0.12, 0.04, 0.26, 0.30, 0.20, 0.24. Legs (2413): I: 21.9 (5.9, 1.5, 6.4, 6.4, 2.7); II: 27.9 (7.2, 1.6, 7.6, 8.1, 3.4); III: 17.8 (4.9, 1.3, 4.7, 5.0, 1.9); IV: 22.3 (6.0, 1.2, 5.5, 7.0, 2.6). Palp: PTA triangular, distally rounded, as wide as long; VTA reduced; vRTA two times longer than wide in retrolateral view; bp of irregular shape, roughly 1.5 times longer than wide ( Figs 67−69 , 74−76 ).

Female (paratype): Prosoma brown; fovea and thoracic striae dark brown; eye borders black. Chelicerae, palps and legs brown, slightly lighter than prosoma; legs with faint brown marks at the base of spines. Labium brown, distally pale brown. Endites pale brown, distally lighter. Sternum pale brown with brown margins. Opisthosoma brown; dorsally with slightly lighter heart mark and two pairs of small rounded muscular impressions; ventrally lighter brown with two more or less parallel lines of muscle impressions. Spinnerets pale brown, distally cream colored ( Figs 70−71 ). Total length 7.6. Prosoma 3.0 long, 2.7 wide. Opisthosoma: 4.6 long, 2.6 wide. Eyes: diameters: 0.23, 0.28, 0.22, 0.29; interdistances: 0.10, 0.04, 0.26, 0.27, 0.20, 0.22. Legs (2143): I: 12.8 (3.5, 1.3, 3.6, 3.1, 1.3); II: 14.4 (4.1, 1.3, 4.1, 3.5, 1.4); III: 10.7 (3.2, 1.0, 2.7, 2.7, 1.1); IV: 12.7 (3.8, 0.9, 3.1, 3.5, 1.4). Epigyne: EF as wide as long; MS with CO situated anteriorly ( Figs 72 , 77 ). Vulva: CD with first winding gently curving laterally; encapsulated part of internal ducts 2.5 times longer than wide, dilated posteriorly; FD anteriad ( Figs 73 , 78−79 ).

Variation. Males (n = 2): Total length 6.6−7.0; prosoma length 3.5−3.7; femur I length 5.4−5.9.

Distribution. Known from the state of Loreto, in north and northeastern Peru ( Fig. 143 ).

Figures

FIGURE 143. Record map for Nativus mariua sp. nov., N. napo sp. nov., N. nocaima sp. nov., N. tupana sp. nov. and N. yurupari sp. nov.

FIGURES 65–69. Nativus napo sp. nov., male (MUSM 5058866). 65−66 Habitus (65 dorsal, 66 ventral); 67−69 Left palp (67 prolateral, 68 ventral, 69 retrolateral). Scale lines: 65−66 = 2 mm; 67−69 = 1 mm.

FIGURES 70–73. Nativus napo sp. nov., female (AMNH). 70−71 Habitus (70 dorsal, 71 ventral); 72−73 Epigyne/vulva (72 ventral, 73 dorsal). Scale lines: 70−71 = 2 mm, 72−73 = 1 mm.

FIGURES 74–79. Nativus napo sp. nov. 74−76 Male (AMNH), left palp (74 prolateral, 75 ventral, 76 retrolateral); 77−79 Female (INPA), epigyne/vulva (77 ventral, 78 dorsal, 79 schematic course of internal duct system). Scale lines: 1 mm. bp = projection at base of embolus; C = conductor; CO = copulatory opening; dRTA = dorsal branch of RTA; DTA = dorsal tegular apophysis; E = embolus; ed = encapsulated part of internal ducts; FD = fertilization duct; fw = first winding of copulatory duct; LL = lateral lobe; MS = median septum; PTA = prolateral tibial apophysis; RdP = retrodistal tegular protrusion; RpP = retroproximal cymbial projection; STlb = subtegular locking lobe; vRTA = ventral branch of RTA.

FIGURES 39–41. Nativus janai sp. nov., male (MPUJ_ENT0070440), left palp (39 prolateral, 40 ventral, 41 retrolateral). Scale lines: 1 mm. bp = projection at base of embolus; C = conductor; dRTA = dorsal branch of RTA; DTA = dorsal tegular apophysis; E = embolus; PTA = prolateral tibial apophysis; RdP = retrodistal tegular protrusion; RpP = retroproximal cymbial projection; STlb = subtegular locking lobe; vRTA = ventral branch of RTA; VTA = ventral tibial apophysis.

FIGURES 136–141. Nativus yurupari sp. nov. 136−138 Male (IAvH-I-3156), left palp (136 prolateral, 137 ventral, 138 retrolateral); 139−141 Female (IAvH-I-3126), epigyne/vulva (139 ventral, 140 dorsal, 141 schematic course of internal duct system). Scale lines: 1 mm. bp = projection at base of embolus; C = conductor; CO = copulatory opening; dRTA = dorsal branch of RTA; DTA = dorsal tegular apophysis; E = embolus; ed = encapsulated part of internal ducts; FD = fertilization duct; fw = first winding of copulatory duct; LL = lateral lobe; MS = median septum; PTA = prolateral tibial apophysis; RdP = retrodistal tegular protrusion; RpP = retroproximal cymbial projection; STlb = subtegular locking lobe; vRTA = ventral branch of RTA; VTA = ventral tibial apophysis.