Remansus serratus Jordal

Jordal, Bjarte H., 2013, Deep phylogenetic divergence between Scolytoplatypus and Remansus, a new genus of Scolytoplatypodini from Madagascar (Coleoptera, Curculionidae, Scolytinae), ZooKeys 352, pp. 9-33 : 24

Remansus serratus Jordal sp. n. Figs 40-43

Type material.

Holotype, male: "Madagascar, Antsiranana Prov, Parc National Montagne d’Ambre (Petit Lac Road) 12°31'13"S, 49°10'45"E, MA-01-01D-03, 29 Jan - 11 Feb 2001, Malaise trap". The holotype is deposited in California Academy of Science (CAS).

Diagnosis.

Male. With a unique Amasa -like truncateddeclivity and rounded posterior angles of the pronotum. Characters suggest a close relationship to Remansus pygmaeus Jordal, but it is distinguished from that species by the much larger size, narrow body shape, the pilose body, and by the slightly elevated scutellum that is not entirely flushwith the elytra. It is further distinguished from males of Remansus mutabilis by the dentate upper declivital margin.

Description.

Male.Length 3.7 mm, 2.1 × longer than wide; colour yellowish brown, darker brown on declivity and elytral lateral margins.

Head. Eyes separated above by 4.2 × their width. Frons concave from vertex to epistoma via inner eye margins; upper half rugosely, densely punctured, lower half smooth and shiny. Vestiture consisting of fine setae increasing in length towards upper part of concave area, longest and most dense along upper margin from vertex to upper level of eyes.

Pronotum 0.9 × as long as wide, sides subparrallel, brodest on anterior half, broadly, transversely rounded in front; surface finely reticulated with minute shallow punctures irregularly spaced by 1 –4× their diameter; pronotal vestiture consisting of fine short setae, slightly longer close to anterior margin.

Elytra 1.2 × longer than wide, 1.7 × longer than pronotum; sides almost straight, broadly triangular at apex; decivital margin marked by a dentate rim, each incision marks the end of diskal stria; striae otherwise not impressed, interstriae on disk only reckognised by the lighter colour, punctures not clearly visible, confused and minute. Interstriae 10 elevated to level of ventrite I. Declivity rugosely granulated, largest granules on interstriae 1 (suture). Vestiture consisting of dense fine setae spaced on disk by less than one-third the length of each seta, on declivity about 2 –3× longer than setae on disk.

Legs. Procoxae separated by 0.4 × the width of one coxa. Mesocoxae separated by 0.5 × the width of one procoxae. Protibiae narrow, with one larger distally lateral curved spine, and 6-7 additional lateral small spines, posterior face mainly smooth, with 4-5 tiny granules close to lateral edge.

Ventral vestiture. Metanepisternum mainly with long simple setae, a few shorter bifid setae anteriorly.

Female: unknown.

Etymology.

The Latin masculine adjective serratus means ‘serrated’, referring to the short pointed projections from interstriae at the declivital summit.

Distribution and biology.

A single specimen was collected in a Malaise trap just south of Montagne d’Ambre.