Pseudoclamoris, Huesser, Martin, 2018

Huesser, Martin, 2018, A first phylogenetic analysis reveals a new arboreal tarantula genus from South America with description of a new species and two new species of Tapinauchenius Ausserer, 1871 (Araneae, Mygalomorphae, Theraphosidae), ZooKeys 784, pp. 59-93 : 59

Pseudoclamoris gen. n. Figs 4, 5, 6, 13, 15b

Type species.

Tapinauchenius gigas Caporiacco, 1954, herein designated.

Species included.

Pseudoclamoris gigas (Caporiacco, 1954), comb. n., Pseudoclamoris elenae (Schmidt, 1994), comb. n., and Pseudoclamoris burgessi sp. n.

Etymology.

The genus name derives from the Greek pseudo meaning false and the Greek clamoris meaning screaming/shouting translating into a "false screaming" group of Theraphosidae with the herein described feature of needle-like setae on the proximal maxilla, since the behaviour of Pseudoclamoris species resembles the one of Psalmopoeus , but no sound is audible when the specimens stridulate in defence posture. Gender is masculine.

Diagnosis.

Species of Pseudoclamoris differ from all known Psalmopoeinae , save Psalmopoeus , by the presence of a stridulatory organ on prolateral maxillae. They differ from Psalmopoeus by the specific shape of the stridulatory organ consisting of a field of needle-like bristles on the proximal maxilla (Figure 2) (vs. maxillary lyra oval in form, covering 1/4th of surface, consisting of short shafted paddles with/without distal blades as in Psalmopoeus , compare with Mendoza 2014: figs. 3, 12-17). They furthermore differ from Ephebopus by the absence of urticating setae on palpal femora. Juveniles of Pseudoclamoris can be distinguished from those of Tapinauchenius by their ontogenetic colour change (Figure 15) and further in the first two instars by their distinct black herringbone pattern on a bright, slightly orange coloured opisthosoma in combination with a dark/black coloured metatarsus, while other leg segments are bright/brown coloured.

Description.

Carapace longer than wide with cephalic region slightly raised and convex. Striae well marked, fovea deep and straight. Chelicerae without rastellum. Eye tubercle distinct and wider than long, anterior eye row is (slightly) procurved and clypeus absent. Labium subquadrate, slightly wider than long, with numerous (100-300) cuspules concentrated on the anterior half. Maxillae subrectangular with anterior lobe distinctly produced into a conical form, with the inner angle bearing numerous cuspules (more than 100). Sternum longer than wide with posterior sigillae submarginal. STC with median row of a few small teeth. All leg tarsi and anterior metatarsi fully scopulated, Mt III scopulated at distal half and Mt IV scopulated only at distal third. Scopulae on anterior tarsi and metatarsi extended laterally resulting in a spatulate appearance. Femur IV without retrolateral scopula.