Neischnocolus caxiuana ( Pérez-Miles, Miglio & Bonaldo, 2008 )

Peñaherrera-R, Pedro, Guerrero-Campoverde, Ariel, León-E, Roberto J., Gabriel, Ray, Sherwood, Danniella & Cisneros-Heredia, Diego F., 2025, Revisiting the tarantula genus Neischnocolus Petrunkevitch, 1925 (Araneae, Theraphosidae): new insights on male palpal bulb morphology and description of three new species, European Journal of Taxonomy 1022, pp. 19-50 : 27

Neischnocolus caxiuana ( Pérez-Miles, Miglio & Bonaldo, 2008)

Figs 2, 4–5

Ami caxiuana Pérez-Miles, Miglio & Bonaldo in Pérez-Miles et al., 2008: 57 , figs 4–10.

Neischnocolus caxiuana – Pérez-Miles et al. 2019: 154

Amended diagnosis

Males of N. caxiuana slightly resemble those males of N. armihuarensis and N. cisnerosi by having an embolus straight perpendicular (dorsal curvature) to palpal organ axis and presence of a median dorsal granular area. Nevertheless, they differ by having an median dorsal granular area composed of spiky spicules extending over dorso-retrolateral surfaces of bulb, PS and PI keels developed and comparatively longer, distal portion of embolus dilated, and prolateral accessory inferior keel absent (median dorsal granular area composed of spiky spicules extending over prolatero-dorsal and retrolateral surfaces of bulb, PS and PI keels weakly developed and comparatively shorter, distal portion of embolus not dilated, and prolateral accessory inferior keel absent in N. armihuarensis ; median dorsal granular area composed of rounded spicules extending only over dorsal surface of bulb, PS and PI keels well-developed and comparatively longer, distal portion of embolus dilated, and prolateral accessory inferior keel extremely weakly developed in N. cisnerosi ). Additionally, N. caxiuana can easily be differentiated from N. armihuarensis by the presence of two developed retrolateral palpal tibial apophyses, while the latter only presents one developed retrolateral palpal tibial apophysis. Females of N. caxiuana differ from those of other known species by having semi-circular spermathecae, spermathecal striae converging in a complete arc, extremely elongated ventral receptacles extending over the length of the spermathecae, weakly developed guard plates.

Type material

Holotype

BRAZIL – Estado do Pará • ♂; FLONA, Estação Científica Ferreira Penna ; A.P. Barreiros and L.T. Miglio leg.; MPEG ( ARA), MPEG ( ARA) 000994 .

Paratype

BRAZIL • 1 ♀; same data as for holotype; 26 May 2003; J.A.P. Barreiros and C.O. Araújo leg.; MPEG ( ARA), MPEG ( ARA) 000989 .