Maechidius muticus Arrow 1941
Creators: name: Telnov, Dmitry
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Maechidius
Maechidius muticus

description: Maechidius muticus Arrow, 1941
Figs 63, 147, 235, 326, 399, 495, 555, 673–675
Type material
Syntypes
INDONESIA • 1 ♂; “ Type [p, label circular, red frame] // SYNTYPE [p, label circular, blue frame] // DUTCH NEW GUINEA: Humboldt Bay Dist. Bewani Mts. 400 metres. vii.1937. [p] // W. Stüber. B.M.1938-177. [p] // Maechidius muticus, type Arrow [h]”; BMNH • 2 ♂♂; “ SYNTYPE [p, label circular, blue frame] // DUTCH NEW GUINEA: Humboldt Bay Dist. Bewani Mts. 400 metres. vii.1937. [p] // W.Stüber. B.M.1938-177. [p]”; BMNH • 1 ♂; “ SYNTYPE [p, label circular, blue frame] // ♂ [p] // W.Stüber. B.M.1938-177. [p] // DUTCH NEW GUINEA: Humboldt Bay Dist. Bewani Mts. 400 metres. vii.1937. [p]”; BMNH.
Remarks
There are several male syntypes from the same locality available for this species. A lectotype is therefore not designated since there is no risk of confusion.
Description
With general features of M. interruptocarinulatus Heller, 1914. Male labroclypeus (Fig. 147) sinuous and shallowly emarginate anteriorly, its anterolateral margins sinuous in both dorsal and lateral views. Anterolateral angles almost right-angled, slightly protruding. Punctures of frons circular to hexagonal, moderately deep and dense. Intervening spaces glossy, generally smaller than punctures. Setae inconspicuous, scale-like, appressed; each seta rises from anterior margin of corresponding puncture, surpassing or not length of corresponding puncture. Male antenna 9-segmented, club 3-lamellate. Pronotum transverse, glossy dorsally and laterally. Anterior margin broadly sinuous with protruding anterolateral angles (stronger) and mesal portion (slightly), basal margin broadly rounded with posterolateral angles somewhat protruding posteriad. Lateral margin of pronotum nearly straight, slightly constricted anteriorly and prebasally, crenulate all along (Fig. 235). Lateral margin of pronotum nearly straight in lateral view. An appressed short seta present between every two crenulae. Lateral and basal margins, antero- and posterolateral angles partly covered with dense microscopical velvety pubescence. Hypomeron emarginate and long setose on anterior margin which is flange-like protruding. Antennal pocket deep. Punctures of pronotal disc generally larger and stronger oblong than those on head, inner margin with thin membrane covered with dense microscopical velvety pubescence. Intervening spaces glossy, in part wrinkled. Setae scale-like, appressed to suberect, generally not surpassing length of corresponding puncture. Longer scale-like clavate suberect setae on posterolateral angles. Scutellar shield narrowly rounded apically. Elytron glossy, with five vague glabrous, variously broadly interrupted longitudinal carinae, including sutural one. Punctures of elytral disc ovoid, generally smaller than on forebody, deep (Fig. 326). Each puncture partly or completely encircled with dense microscopical velvety pubescence. Intervening spaces glossy, glabrous, generally smaller than punctures. Setae inconspicuous, generally not surpassing length of corresponding punctures, becoming somewhat longer and less appressed along tracks of longitudinal carinae. Each elytron with a long lateral subhumeral seta on lateral margin. Male pygidium flattened dorsally (Fig. 495). Punctures of pygidium ovoid, dense and very deep, setae suberect, not or hardly surpassing length of corresponding punctures. Male protibia somewhat arched and crenulate on external margin, with single obtuse distal tooth (Fig. 399). Male tarsal claws with pulvilli. Spiculum gastrale as in Fig. 555. Aedeagus as in Figs 673–675.
Sexual dimorphism
Female is unknown.
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 81-83, DOI: 10.5852/ejt.2020.721.1127, http://zenodo.org/record/4122118