Aulacocyclus yorkensis, Reyes-Castillo & Jiménez-Ferbans, 2016
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publication ID |
https://doi.org/ 10.1016/j.rbe.2016.05.003 |
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persistent identifier |
https://treatment.plazi.org/id/1429233A-DE5A-FFE1-B742-F9C8FB681E3A |
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treatment provided by |
Felipe |
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scientific name |
Aulacocyclus yorkensis |
| status |
sp. nov. |
Aulacocyclus yorkensis View in CoL sp. nov. ( Fig. 1 View Fig ).
Description
Habitus: Cylindrical, parallel sides, shiny black. Total length (tip of mandibles to tip of elytra): 35.4–39.6 mm.
Head: Labrum asymmetric, anterior margin concave with angles rounded, evenly covered by long setae. Clypeus transverse, straight and narrow, with small punctures. Frontal and occipital areas smooth. Frontal ridges, internal tubercles and cephalic mamelon absent. Central tubercle short, apex truncate (lateral view), projecting anteriorly at 45 ◦ and divided lengthwise with punctures on groove. Posterolateral tubercles absent. Supra-orbital ridges straight and thick. Ocular canthus glabrous, anterior margin concave and acutely angled. Postocular margin and lateral–occipital area punctate and setose. Anterior border of ligula tridentate, central tooth longer than lateral teeth; ligula concave. Maxilla with lacinia bidentate, superior tooth divided in two small teeth. Hypostomal process widely separated from mentum, small, not reaching anterior border of median basal region of mentum. Median basal region of mentum glabrous, with a longitudinal groove. Lateral fossae of mentum pubescent. Anterior line of the gula arched. Antennal club with three short and thick lamellae. Mandibles tridentate, supraterminal tooth small, barely insinuated and infra-apical tooth bigger than median-apical tooth; mandibular pubescence dorsally covering internal-superior teeth base.
Thorax: Pronotum quadrangular, only lateral fossae and marginal groove with small punctures; anterior angles smoothly right-angled; marginal groove wide on anterior margin, occupying 4/5 of pronotal anterior border; median groove well defined and complete; lateral fossae glabrous and well defined. Prosternellum rhomboidal acute and shagreened. Pronotal arms shiny and pubescent on posterior border. Mesosternum shiny, with small group of setae on anterior edge; scar absent. Posterior angle of mesepisternum with short setae; mesepimeron pubescent. Metasternal disk not bounded by punctate area; anteriolaterally and laterally completely pubescent. Metasternal groove pubescent.
Elytra: Dorsal surface shiny, anterior border rectangular and pubescent; humeri and epipleurae glabrous; lateral and dorsal striae with weak, rounded punctures.
Wings: Fully developed.
Legs: Groove over anterior ventral border of profemur complete; protibia widened toward the apex, with dorsal groove complete; meso and metatibiae without lateral spines.
Abdomen: Last sternite glabrous, all other sternites setose. Marginal groove of last sternite incomplete laterally.
Aedeagus: elongate; in ventral view ( Fig. 1 View Fig ), basal piece fused to parameres; median lobe strongly sclerotized, spherical, being 1/3 of total length of aedeagus. In dorsal view ( Fig. 1 View Fig ), ventrodorsal basal sclerotizations of the phallus present.
Variation: The lengths of the sides of labrum are variable, in the holotype the right side of labrum is longer than left side; however, in one of paratypes the lengths are reversed and in the other paratypes both sides are of equal length.
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