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

description: Maechidius kazantsevi sp. nov.
urn:lsid:zoobank.org:act: 5AAB251F-9877-41E0-85EC-EB299FE0FA9F
Figs 48, 129, 221, 311, 385, 479, 548, 626–628
Differential diagnosis
This species is undoubtedly very close to M. perlatus (Frey, 1969) comb. nov. and M. ursus sp. nov. (see description below), but differs in the shape of the male genitalia, the prebasally shortly excavated lateral margin of the pronotum, vestiture, and punctures of the pronotum, elytra, pygidium and abdominal ventrites.
Etymology
Patronymic. This species is named after Sergey Kazantsev (Moscow, Russia), a famous specialist of Lycidae and my good friend.
Type material
Holotype
INDONESIA • ♂; “ ♂ [p] // W.Stüber. B.M. 1938-177. [p] // DUTCH NEW GUINEA: Humboldt Bay Dist. Pukusam [sic ♂ Correct name is Pukusum] Dist. West of Tami River. vi.1937. [p]”; BMNH.
Description
MEASUREMENTS. Male holotype, total body length 9.35 mm. Head 1.80 mm long, across eyes 2.10 mm wide. Pronotum 2.30 mm long, maximum width 3.60 mm. Elytral length 5.25 mm, maximum combined width 4.35 mm.
Dorsum uniformly dark brown with paler brown legs. Head transverse, glossy dorsally and ventrally, dorsally convex between eyes and impressed at each anterolateral angle of labroclypeus. Compound eye large, occupying about half side of head. Male labroclypeus (Fig. 129) deeply and broadly emarginate on anterior margin, its lateral margins sinuous in both dorsal and lateral views. Anterolateral angles of male labroclypeus strongly protruding, acute in dorsal view, bent up at ~90-100° to axis of frons in lateral view. Upper- and underside of labroclypeus with long setae along anterior and lateral margins. Canthus broadly rounded in dorsal view. Anterior and lateral margins of labroclypeus smooth. Head dorsal punctures circular to ovoid, very deep and dense. Inner margin of most punctures with delicate membrane covered with microscopical velvety pubescence (Fig. 129). Intervening spaces glossy, variably large. Canthus, part of lateral margin of labroclypeus and narrow area around inner margin of each compound eye covered with microscopical velvety pubescence. Dirty-yellow suberect to erect moderately long, in part curved seta rises from anterior margin of each puncture. Antenna 9-segmented, club 3-lamellate. Scape large, with bulbous predistal projection on dorsal side, provided with two very long setae near distal margin. Pronotum strongly transverse, glossy dorsally and laterally, anterior margin broadly emarginate and basal margin broadly rounded. Lateral margin of pronotum very broadly rounded, shortly emarginate at posterolateral angles, delicately crenulate all along (Fig. 221). Conspicuous appressed brush of clustered setae present between every two crenulae. Lateral margin of pronotum nearly straight in lateral view. Areas at antero- and posterolateral angles of pronotum slightly dorsally impressed. Punctures oblongovoid, very deep and dense, arranged in dichotomic rows (Fig. 221). Inner margin of most punctures completely or partly with delicate membrane covered with microscopical velvety pubescence (Fig. 221). Intervening spaces glossy, smaller than punctures. Pronotal setae scale-like, longer on anterior margin facing frons and at posterolateral angles, but medially and basally generally short and not surpassing length of corresponding punctures. Conspicuous rather long appressed brush of clustered setae (fur-like) rises from each puncture along lateral and anterior margins of pronotum (both dorsally and ventrally), especially dense on antero- and posterolateral angles. Basal and lateral margins of pronotum covered with microscopical velvety pubescence. Hypomeron nearly straight, very long setose on anterior margin opposite to compound eye, flange-like, covered by fur-like pubescence. Antennal pocket deep. Scutellar shield covered with microscopical velvety pubescence, narrowly rounded apically. Elytron completely covered with microscopical appressed fur-like pubescence (Figs 48, 311), surface structure therefore almost completely hidden. Elytron maximum width across midlength, with obsolete humerus and distinct omoplate. Tracks of four convex longitudinal carinae on each elytron (including sutural one) formed by irregular delicate glossy glabrous humps. Elytral punctures delicate, oblongo-ovoid, moderately deep, generally smaller than those on forebody and with microreticulate background (Fig. 311). Intervening spaces generally much larger than punctures. Setae of elytra inconspicuous, appressed, rise from anterior margin of corresponding punctures, not surpassing their length. Moderately long, suberect, sparse scale-like and apically pointed setae arranged in irregular longitudinal rows along remnants of elytral carinae. Male pygidium flattened dorsally, deeply oblongo-punctate, intervening spaces covered with microscopical velvety pubescence directed in part circularly around punctures (Fig. 479). Setae of pygidium inconspicuous, sparse, suberect. Venter covered with sparse small shallow punctures, each provided with short brush of fur-like clustered setae. Ventral intervening spaces in part covered with microscopical velvety pubescence. Distal margin of male metatibia with projection over basal metatarsomere. Male metatibia flattened and glabrous on inner margin. Male protibia nearly straight on external margin, with complete dorsal groove. Two large distal teeth on external margin of male protibia, distal one acute (Fig. 385). Male protibial terminal spur large, curved. Male lower metatibial terminal spur curved. Tarsal claws with pulvilli (in males only?). Spiculum gastrale as in Fig. 548. Male aedeagus as in Figs 626–628.
Sexual dimorphism
Female is unknown.
Ecology
Occurs in lowland rainforests.
Distribution
Western surroundings of Jayapura, North New Guinea.
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 59-61, DOI: 10.5852/ejt.2020.721.1127, http://zenodo.org/record/4122118