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

description: Maechidius seriegranosus Heller, 1914
Figs 80, 171, 250, 341, 413, 515, 560, 706–708
Type material
Lectotype [herewith designated]
PAPUA NEW GUINEA • ♂; “ Br. N. Guinea Aroa Fl. E.Weiske [p, blue label] // 14420 [h, blue label]// Typus! [p] seriegranosus [h, red label]// Staatl. Museum für Tierkunde.Dresden [p]”; SNSD.
New material
PAPUA NEW GUINEA • 2 specs; “ Papua: Kokoda. 1,200ft. x.1933. L.E.Cheesman. B.M.1934-321.”; BMNH • 23 specs; “ PAPUA:Mondo. 5,000ft. ii.1934. L.E.Cheesman. B.M.1933-321 [&] 492.”; BMNH • 1 ♀; “ PAPUA:Mondo. 5,000ft. ii.1934. L.E.Cheesman. B.M.1933-321.// Maechidius fraterculus Moser Determined from description. G.J.A.”; BMNH.
Remarks
Heller (1914: 628) likely based his description of M. seriegranosus on a single specimen – although not explicitly stated. The single SNSD specimen labelled “Typus♂” is herewith designated as lectotype in order to enhance the stability of nomenclature and fix the specimen I based my redescription on, in case other syntypes are discovered in the future.
Description
MEASUREMENTS. Total body length 6.80 mm (lectotype).
Dorsum and venter uniformly dark brown, appendages paler brown. Head convex dorsally between compound eyes, with inconspicuous transverse impression at front margin of either eye, glossy dorsally and ventrally. Male labroclypeus (Fig. 171) deeply U-shaped emarginate on anterior margin, its lateral margins strongly sinuous in both dorsal and lateral views. Anterolateral angles rounded, strongly protruding, raised up at angle of nearly 80–90° to frons in lateral view. Anterior and lateral margins of labroclypeus smooth. Underside of labroclypeus with sparse long delicate setae along anterior and lateral margins. Canthus strongly obtusely angulate in dorsal view. Punctures of frons irregularly hexagonal, in part annular, moderately large and deep. Intervening spaces glossy, variably large. Head setae minute, appressed; each seta rises from anterior margin of corresponding puncture not surpassing its length. Antenna 9-segmented, club 3-lamellate. Pronotum transverse, flattened dorsally, glossy dorsally, opaque laterally. Anterior margin of pronotum broadly emarginate with strongly protruding anterolateral angles, basal margin sinuous. Lateral margin of pronotum very broadly rounded in dorsal view, crenulate all along except denticulate prebasal area; lateral margin with 13–15 crenulae / denticles. Inconspicuous suberect seta present between every two crenulae (Fig. 250). Lateral margin of pronotum sinuous in lateral view. Pronotal punctures irregularly ovoid to hexagonal, annular, dense, moderately deep. Intervening spaces glossy, flat. Setation as on head. Hypomeron separated from prosternum by moderately high nearly straight carina, with long setae on anterolateral margin opposite of compound eye. Antennal pocket moderately deep. Scutellar shield rounded apically. Elytron subopaque, with vague tracks of three longitudinal carinae, including sutural one. Elytral punctures sinuous (elongate and narrow), incision-shaped, shallow (Fig. 341). Intervening spaces wrinkled. Appressed to suberect seta rises from anterior margin of each puncture, not surpassing length of corresponding incision. Lateral margins of elytra in part covered with microscopical velvety pubescence. Male and female pygidium flattened dorsally, opaque, with large shallow annular punctures (Fig. 515). Intervening spaces microreticulate, much smaller than punctures. Setae of pygidium suberect, surpassing length of corresponding punctures. Male protibia widened distally, with three external teeth, median one largest (Fig. 413). Male protibial terminal spur narrow. Male metatibia distally with a brush of dense long sinuous setae. Male metatibial terminal spurs long, unequal, lower spur slightly curved. Male basal metatarsomere with a brush of dense long sinuous setae on inner margin. Tarsal claws with pulvilli. Spiculum gastrale as in Fig. 560. Aedeagus as in Figs 706–708.
Sexual dimorphism
Female lamellae of antennal club shorter; female pygidium with inconspicuous preapical dorsal impression.
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 104-105, DOI: 10.5852/ejt.2020.721.1127, http://zenodo.org/record/4122118