Maechidius aroae Heller 1914
Creators: name: Telnov, Dmitry
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Maechidius
Maechidius aroae

description: Maechidius aroae Heller, 1914
Figs 23, 101, 201, 290, 363, 456
Type material
Lectotype [herewith designated]
PAPUA NEW GUINEA • ♀; “14716 [h] // Typus ♂ [p] Aroae Heller [h, red label]// Staatl. Museum für Tierkunde.Dresden [p]”; SNSD.
Heller (1914: 627) based his description of M. aroae on an unstated number of specimens. The single SNSD specimen labelled “Typus♂” is herewith designated as the lectotype in order to enhance the stability of nomenclature and fix the specimen that I based my redescription on, in case other syntypes are discovered in the future.
Description
MEASUREMENTS. Total body length 9.60 mm (lectotype).
Dorsum and venter uniformly black-brown with exception of paler brown appendages and labroclypeus. Head flattened dorsally, subopaque dorsally and ventrally. Female labroclypeus very broadly emarginate anteriorly (Fig. 101), its lateral margins nearly straight in dorsal, sinuous in lateral view. Anterolateral angles of labroclypeus very broadly rounded, not protruding, raised up at angle of nearly 90° to frons in lateral view. Anterior and lateral margins of labroclypeus smooth. Underside of labroclypeus with sparse long setae along anterior and lateral margins. Canthus very broadly rounded in dorsal view. Punctures of frons circular, moderately large and shallow. Intervening spaces microreticulate, generally much larger than punctures. Pubescence delicate, variably long, appressed. Some setae very short, much shorter than corresponding punctures. Each seta rises from anterior margin of corresponding puncture. Female antenna 8-segmented, club 3-lamellate (antenna 7-segmented according to Frey (1969)). Pronotum transverse, flattened dorsally, subopaque dorsally and laterally. Anterior margin emarginate with anterolateral angles protruding anteriad. Basal margin subtruncate. Lateral margin of pronotum broadly rounded, somewhat more strongly constricted in basal fourth, crenulate in anterior, denticulate in posterior half (Fig. 201). Long distally curved erect seta present between every two crenulae / denticles. Lateral margin of pronotum slightly sinuous in lateral view. Punctures circular to ovoid, shallow. Intervening spaces as large as to larger than punctures. Hypomeron separated from prosternum by low straight carina, with extraordinarily long setae on anterolateral margin opposite to compound eye. Antennal pocket shallow. Scutellar shield subtriangular, narrowly rounded apically. Elytron glossy, with vague tracks of two vague glabrous longitudinal carinae. Sutural carinae not present. Punctures of disc sparse, narrow and rather deep, linear incision-shaped (Fig. 290). Inconspicuous suberect seta rises from under anterior margin of each puncture; setae generally longer than corresponding punctures. Intervening spaces in part microreticulate, micropunctate or wrinkled. Setae inconspicuous, short, suberect. Female pygidium flattened dorsally, with large annular punctures (Fig. 456). Intervening spaces glossy, smaller than punctures except along midline. Female protibia widened distally, with three large external teeth: two larger acute distal and one obtuse basal (Fig. 363). Protibial terminal spur not present. Female metatibial terminal spurs short, apically rounded. Tarsal claws with pulvilli (in females only?).
Sexual dimorphism
Male 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 22-24, DOI: 10.5852/ejt.2020.721.1127, http://zenodo.org/record/4122118