Hystatoderes Lameere, 1917

Hystatoderes Lameere, 1917 View in CoL

Hystatoderes Lameere, 1917: 146 . Type species: Hystatoderes vitalisi Lameere, 1917 , by monotypy.

= Laokaya Pic, 1928:10 View in CoL – syn. nov. Type species: Laokayavitalisi Pic, 1928, by monotypy.

Hystatoderes Lameere, 1919: 65 View in CoL (female description, list of species).

Hystatoderes Lameere, 1920: 139 View in CoL (genus validation).

Hystatoderes Drumont et al., 2000: 492 View in CoL (lectotype designation, species composition).

Hystatoderes Li et al., 2014: 83 View in CoL (list of species).

Hystatoderes Drumont & Komiya, 2010: 88 View in CoL (list of species).

Hystatoderes Drumont & Komiya, 2020: 108 View in CoL (list of species).

Diagnostic characters

Most of the species of the tribe Anacolini are small and the genus Hystatoderes stands out for the large size of itsspecies. They exhibita stocky habitus rather like other Prionini , a transverse pronotum, swollen on the discal area, more or less wrinkled with lateral spines and a rather clear pilosity. The elytra present punctation and wrinkles on the basal and periscutellar zone, the costae being not very apparent. The antennae are 11-articulated in both sexes, relatively short, not exceeding 2/3 or 3/4 of the elytral length with antennomeres 4 to 10 of about the same length. Meso- and metatibiae are strongly recessed on the inner side. The lower eye-lobe is not much wider than the upper one and does not protrude below the insertion of the antennae.

Sexual dimorphism

- All the species of this genus are characterized by a very important sexual dimorphism to the point that it is difficult to make a species link between the two sexes.

- The male shows much smaller body size and elytra elongated, narrowed at apex and with more angular humeral corners, whereas the female shows an oblong elytral shape, which is slightly enlarged between the middle and two thirds of the elytra, and rounded humeral angles.

- The elytra of the male are covered with sparse, fairly fine hairs, with fairly sharp ridges and a satiny appearance, while those of female are hairless, with barely visible ridges and a shiny appearance. In addition to the elytra, golden hairs are present on forehead, vertex, pronotum and scutellum of males.

- The male has a narrower head with a closer upper interocular space than that of the female and longer antennae with strongly punctate antennomeres and sharp or angular apical angles, whereas the antennomeres are smooth with rounded angles at the apex in the female.

- The pronotum of the male is trapezoidal, entirely punctate, with spines towards the base of the lateral margins and effaced apical angles. The pronotum of the female is sub-quadrangular, with a smooth swollen disc, strongly crenellated or spiny sides and very angular apical angles.

- The femora and tibiae are spotted and scattered with hairs in the male, whereas they are almost smooth and hairless in the female. Finally, the tarsi of the male are slightly longer and expanded compared to the female.

FAUNITAXYS - ISSN (Print): 2269 - 6016 - ISSN (Online): 2970 - 4960