Maechidius deltouri, Telnov, 2020

Telnov, Dmitry, 2020, A revision of the Maechidiini Burmeister, 1855 (Coleoptera: Scarabaeidae: Melolonthinae) from the Indo-Australian transition zone, and the first record of the tribe west of Wallace’s Line, European Journal of Taxonomy 721, pp. 1-210 : 41-42

publication ID	https://doi.org/ 10.5852/ejt.2020.721.1127
publication LSID	lsid:zoobank.org:pub:89E62EF8-2E45-4C59-94B7-6A5603E8939B
DOI	https://doi.org/10.5281/zenodo.4344359
persistent identifier	https://treatment.plazi.org/id/9F79D2BF-8ADF-4856-9400-2AFCA33DB0D1
taxon LSID	lsid:zoobank.org:act:9F79D2BF-8ADF-4856-9400-2AFCA33DB0D1
treatment provided by	Valdenar
scientific name	Maechidius deltouri
status	sp. nov.

Treatment

Maechidius deltouri View in CoL sp. nov.

urn:lsid:zoobank.org:act:9F79D2BF-8ADF-4856-9400-2AFCA33DB0D1

Figs 34 View Figs 31–34 , 115 View Figs 109–120 , 211 View Figs 208–225 , 301 View Figs 286–301 , 374, 468, 542, 607–610

Differential diagnosis

This species is most similar to M. peregrinus Lansberge , M. babyrousa sp. nov., M. legalovi sp. nov. and M. suwawa sp. nov. (all from Sulawesi). It readily differs from them and other congeners only in the shape of the male genital organs. Two vague circular impressions on the pronotal disc are also present in M. babyrousa sp. nov.

Etymology

Patronymic. This species is named after Gaёtan Deltour (Naturevolution, La Rochelle, France) to commemorate his efforts in the conservation of Sulawesi biodiversity.

Type material

Holotype

INDONESIA • ♂; “ INDONESIA SULAWESI UTARA Gng. Ambang F.R. nr. Kotamobagu 18-24 May 1985. // Yellow pan trap // R.Ent.Soc.Lond. PROJECT WALLACE B.M. 1985-10.”; BMNH.

Description

MEASUREMENTS (exposed abdominal ventrites not included). Male holotype, total body length 8.45 mm. Head 1.60 mm long, across eyes 1.80 mm wide. Pronotum 1.65 mm long, maximum width 2.80 mm. Elytral length 5.20 mm, maximum combined width 3.80 mm.

Dorsum uniformly brown with castaneous labroclypeus, mouthparts, legs and venter. Head transverse, trapezoid, flattened on frons, convex on vertex, glossy dorsally and ventrally, with large not prominent compound eyes occupying nearly half side of head. Male labroclypeus ( Fig. 115 View Figs 109–120 ) broadly emarginate anteriorly, its lateral margins smooth, slightly sinuous in both dorsal and lateral views. Anterolateral angles strongly protruding anteriad, almost right-angled, bent up perpendicularly to axis of frons in lateral view. Head dorsal punctures irregularly circular to hexagonal, larger in median part. Intervening spaces glossy, much smaller than punctures. Pubescence brownish, rather long and erect but sparse; each seta rising from different part of puncture. Labroclypeus laterally and frontally with delicate yellowish setae. Labroclypeus laterally and frontally with delicate yellowish setae, longest of which present near compound eyes. Male antenna 9-segmented. Scape large, widened on upper side in distal half, provided with few long erect setae on posterior and distal margin. Antennomere 2 short and transverse. Club 3-lamellate. Pronotum transverse, glossy.Anterior margin of pronotum slightly sinuous with anterolateral angles (stronger) and mesal portion (slighter) protruding anteriad. Basal margin of pronotum broadly rounded. Lateral margin of pronotum evenly broadly rounded, largely crenulate all along except for delicately crenulate prebasal area ( Fig. 211 View Figs 208–225 ). Disc with two vague circular postmedian impressions on either side. Lateral margin of pronotum nearly straight in lateral view. Punctures irregularly circular to ovoid, deep and coarse; inner margin with delicate membrane in part covered by microscopical velvety pubescence and partly encircling puncture. Intervening spaces much smaller than punctures, glossy, partly wrinkled. Setation as on head, stronger curved; long seta between each two lateral crenulae and all along basal margin. Hypomeron smooth, sparsely punctured with circular punctures, emarginate opposite to eye (to receive canthus separating compound eye) and covered with long setae, with anterior margin which is flange-like produced. Antennal pocket deep. Scutellar shield triangular, pointed apically. Elytra cylindrical, maximum width in postbasal ¾, glossy and slightly convex dorsally, with rounded humeri and elevated omoplates. Indistinct track of one flat longitudinal carina on each elytron. Sutural carinae not indicated. Rather large obtuse hump on each elytron near apex. Elytral disc and lateral sides of elytra irregularly densely punctured, punctures ovoid; inner margin with delicate membrane in part or completely covered by microscopical velvety pubescence and partly or completely encircles puncture ( Fig. 301 View Figs 286–301 ). Setae inconspicuous and short, appressed (except suberect longer slightly clavate scale-like setae on disc and elytral apices), generally longer than on forebody (seta as long as length of corresponding puncture, not or hardly surpassing length of corresponding puncture). Intervening spaces glossy, vary from smaller than up to 2 × as large as punctures. An inconspicuous suberect seta rises from anterior margin of each puncture. Epipleuron with row or two (in broad anterior part) of suberect setae. Male pygidium with rather flat mesal hump at apical margin, with shallow annular punctures and partly microscopically velvety pubescent intervening spaces ( Fig. 468 View Figs 451–468 ). Setae of pygidium rather long, suberect. Male abdominal ventrites glossy, covered with large annular punctures, each provided with short seta. Legs long and slender, femora and tibiae covered with delicate whitish setae. Proand metatibiae rather strongly thickened distally. Outer margins of meso- and metatibiae densely denticulate. Two strong teeth on external margin of male protibia (Fig. 374). Male lower meso- and metatibial terminal spur strongly curved. Distal margin of metatibia in both sexes with projection over basal metatarsomere. Male metatibial spurs shorter than basal metatarsomere. Male tarsal claws with pulvilli. Spiculum gastrale as in Fig. 542. Male aedeagus as in Figs 607–610 View Figs 601–616 .

Sexual dimorphism

Female is unknown.

Ecology

Inhabits lowland rainforests. Attracted to yellow pan traps (anthophilous?). Possibly nocturnal.

Distribution

Hitherto only known from North Sulawesi.