Amazonius, Cifuentes & Bertani, 2022

Cifuentes, Yeimy & Bertani, Rogerio, 2022, Taxonomic revision and cladistic analysis of the tarantula genera Tapinauchenius Ausserer, 1871, Psalmopoeus Pocock, 1985, and Amazonius n. gen. (Theraphosidae, Psalmopoeinae), Zootaxa 5101 (1), pp. 1-123 : 98-99

publication ID	https://doi.org/ 10.11646/zootaxa.5101.1.1
publication LSID	lsid:zoobank.org:pub:0FD7126B-77A7-4B99-A0E7-04298368C3C4
DOI	https://doi.org/10.5281/zenodo.6822186
persistent identifier	https://treatment.plazi.org/id/03BF87CE-A357-FF86-FF5E-FD2AFA74F984
treatment provided by	Plazi
scientific name	Amazonius
status	gen. nov.

Treatment

Amazonius View in CoL n. gen.

( Figs 19 View FIGURE 19 , 311–417 View FIGURE 311 View FIGURES 312–319 View FIGURES 320–323 View FIGURES 324–329 View FIGURES 330–336 View FIGURES 337–341 View FIGURES 342–344 View FIGURES 345–352 View FIGURES 353–361 View FIGURES 362–363 View FIGURES 364–371 View FIGURES 372–375 View FIGURES 376–387 View FIGURES 388–391 View FIGURES 392–397 View FIGURES 398–405 View FIGURES 406–409 View FIGURES 410–415 View FIGURES 416–417 )

Tapinauchenius View in CoL : in part, T. elenae Schmidt, 1994 View in CoL .

Pseudoclamoris : in part, P. burgessi Hüsser, 2018 View in CoL .

Type species. Amazonius elenae ( Schmidt, 1994) View in CoL .

Diagnosis. Amazonius n. gen. species resemble those of Psalmopoeus by the presence of a maxillary lyra. They can be distinguished by the lyra being oval, formed by only slender and numerous setae ( Fig. 322 View FIGURES 320–323 ) compared to the lyra of Psalmopoeus .

Etymology. The generic name refers to the Amazon, the geographic region where all the species of the genus are known to inhabit. The genus is masculine in gender.

Composition. Amazonius elenae ( Schmidt 1994) n. comb., Amazonius burgessi ( Hüsser, 2018) n. comb., Amazonius giovaninii n. gen. n. sp., Amazonius germani n. gen. n. sp.

Description. Carapace longer than wide, cephalic region slightly raised. Cephalic and thoracic striae conspicuous. Fovea straight, deep. Chelicerae without rastellum. Strikers: Long and short filiform setae disposed without any noticeable pattern on a ventral-basal portion of chelicera before the tooth row ( Fig. 323 View FIGURES 320–323 ). Eye tubercle slightly raised or raised, wider than long. Clypeus absent. Anterior eye row straight. Labium wider than long or as long as wide, with ca. 117–211 cuspules concentrated on anterior third center. Maxillary lyra weakly developed, composed of slightly thick setae with rugose aspect, not disposed on an ordered line, grouped forming an oval patch on the prolateral face of the maxilla ( Fig. 322 View FIGURES 320–323 ). Maxilla sub-rectangular, anterior lobe distinctly produced into conical process, inner angle bearing ca. 135–247 cuspules. Labio-sternal groove shallow, flat, with two slightly separate sigilla. Sternum longer than wide, posterior angle acute, not separating coxae IV. Sigilla: three pairs, posterior oval, anterior small, all one diameter or less from margin, some pairs sometimes not evident. Leg formula: I=IV II III (most species), IV I II III ( A. elenae n. comb. and A. germani n. sp. females). Laterally directed setae on metatarsi and tibia of males. Clavate trichobothria on distal 2/3 of tarsi. Scopula of tarsi and metatarsi I–II very extended laterally giving them a spatulate appearance. Femora IV without retrolateral scopula. Stridulatory setae absent of coxae of legs and palp. Legs with spines on ventral apical tibiae and metatarsi, without central spines. ITC absent; STC with small denticles. Posterior lateral spinnerets digitiform. Urticating setae lacking. Male tibiae I with tibial apophysis with two processes, retrolateral longer than prolateral, metatarsi I folds on retrolateral side of tibial apophysis. A protuberance behind retrolateral process. Tibiae II lacking apophysis. Globose bulb with small subtegulum; prominence on prolateral tegulum developed. Embolus not flattened, lacking keels, long, lacking a curved tip. Embolus proximal portion straight in frontal view. Cymbium sub-triangular in retrolateral view, with almost equal lobes, without developed rounded process on retrolateral lobe. Spermathecae straight, completely separated, elongate, with well defined projections or lobes on apical area ( A. elenae n. comb. and A. burgessi n. comb.) or with a subdivided apical lobe ( A. giovaninii n. gen. n. sp. and A. germani n. gen. n. sp.). All species show ontogenetic changes on abdominal pattern. Brownish juveniles lacking metallic green or blue sheen, with black tarsi contrasting with other lighter articles.

Distribution. Venezuela, French Guiana, Colombia, Ecuador, Brazil and Peru.

Key to Amazonius View in CoL n. gen. species

Males

1 Embolus with an accentuated curvature to retrolateral side distally ( Fig. 315 View FIGURES 312–319 )...................................... 2

- Embolus mostly straight, with a slight curvature distally ( Fig. 348 View FIGURES 345–352 ).............................................. 3

2 Embolus with basal curvature and narrowing at tip ( Figs 312, 315 View FIGURES 312–319 )................................ A. elenae View in CoL n. comb.

- Embolus basal portion roughly straight and tapering to tip ( Figs 398, 401 View FIGURES 398–405 )..................... A. germani View in CoL n. gen. n. sp.

3 Embolus in dorsal view thick narrowing abruptly on distal portion ( Fig. 367 View FIGURES 364–371 ).................. A. giovaninii View in CoL n. gen. n. sp.

- Embolus in dorsal view tapering from its half ( Fig. 348 View FIGURES 345–352 )...................................... A. burgessi View in CoL n. comb.

Females

1 Spermathecae with single sub segmented distal lobe ( Fig. 371 View FIGURES 364–371 )................................................. 2

- Spermathecae with multilobular distal lobes ( Fig. 319 View FIGURES 312–319 )........................................................ 3

2 Femora I and II ventrally covered with modified short stiff setae ( Figs 357–359 View FIGURES 353–361 )............... A. giovaninii View in CoL n. gen. n. sp.

- Femora I and II ventrally covered with normal long and slender setae ( Figs 360–361 View FIGURES 353–361 )............. A. germani View in CoL n. gen. n.sp.

3 Femora I and II ventrally covered with modified short stiff setae ( Figs 355–356 View FIGURES 353–361 )................... A. burgessi View in CoL n. comb.

- Femora I and II ventrally covered with normal long and slender setae ( Figs 353–354 View FIGURES 353–361 )................. A. elenae View in CoL n. comb.