Maechidius deltouri Telnov 2020, sp. nov.
Creators: name: Telnov, Dmitry
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Maechidius
Maechidius deltouri

description: Maechidius deltouri sp. nov.
urn:lsid:zoobank.org:act: 9F79D2BF-8ADF-4856-9400-2AFCA33DB0D1
Figs 34, 115, 211, 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) 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). 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). 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). 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.
Sexual dimorphism
Female is unknown.
Ecology
Inhabits lowland rainforests. Attracted to yellow pan traps (anthophilous?). Possibly nocturnal.
Distribution
Hitherto only known from North Sulawesi.
description: Published as part of 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, pp. 1-210 in European Journal of Taxonomy 721 on pages 41-42, DOI: 10.5852/ejt.2020.721.1127, http://zenodo.org/record/4122118