Erwinanillus, Giachino & Eberhard & Perina, 2021

Giachino, Pier Mauro, Eberhard, Stefan & Perina, Giulia, 2021, A rich fauna of subterranean short-range endemic Anillini (Coleoptera, Carabidae, Trechinae) from semi-arid regions of Western Australia, ZooKeys 1044, pp. 269-337 : 269

Erwinanillus gen. nov. Figs 1-3

Type species.

Erwinanillus baehri sp. nov.

Diagnosis.

Included species strongly characterised by the presence of longitudinal elytral grooves; male protarsi with two dilated tarsomeres and profemora unarmed; metafemora dentate and metatrochanters short and stout in male and female. Labial tooth absent. Head characterised by temples with a series of long excess setae. One elytral discal seta present. Aedeagus with right paramere bearing two apical setae; left bearing only one seta. This genus can be distinguished from Externanilus Baehr & Main, 2016 by the presence of grooves on elytral disc.

Description.

Included species of small-medium size (TL mm 1.40-1.42), anophthalmous. Depigmented and poorly sclerified integument covered with a sparse pubescence.

Head robust, almost hypertrophic, slightly narrower than the pronotum, with a series of excess long setae; labium toothless, mentum articulated, not fused with the submentum. Antennae moniliform, without particular features.

Pronotum subquadrate, with sides distinctly sinuate in the basal third. Basal angles subsquare and acuminate; basal border as wide as the anterior border; presence of two marginal setae, the posterior one placed before the basal angles.

Elytra oval and slightly elongated, separately rounded, not truncate and not emarginated apically; poorly convex and with a longitudinal groove. Elytral striae missing (except for the sutural stria). Lateral margin, distinctly crenelated from the humeral area to the apical third. Scutellar pore present, large and umbilicate; umbilicate series of type B (sensu Jeannel 1963; Giachino and Vailati 2011); disc bearing one discal seta.

Legs relatively short and stumpy. Profemora unarmed, metafemora dentate, metatrochanters normal, two dilated protarsomeres in the male.

Aedeagus small, median lobe moderately elongated, apex acuminate with apical blade very evident. Parameres stocky, bearing one apical seta (left) or two apical setae (right). Endophallus without sclerified phanerae.

Etymology.

Dedicated to the memory of Terry Lee Erwin, renowned carabid beetle specialist and explorer of world biodiversity. Name composed of Erwin and the genus name Anillus . The gender of the name is masculine.

Species included.

For the time being, the genus is monotypic and only E. baehri sp. nov. belongs to this genus.

Figures

Figures 1 - 3. Erwinanillus baehri gen. et sp. nov., HT ♂. 1 habitus 2 right metafemur and metatrochanter in ventral view 3 aedeagus in left lateral view. Scale bars: 0.1 mm.