Maechidius jobiensis Moser, 1920

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, European Journal of Taxonomy 721, pp. 1-210 : 58-59

publication ID	https://doi.org/ 10.5852/ejt.2020.721.1127
publication LSID	lsid:zoobank.org:pub:89E62EF8-2E45-4C59-94B7-6A5603E8939B
DOI	https://doi.org/10.5281/zenodo.4344249
persistent identifier	https://treatment.plazi.org/id/1A3787F6-9D25-9261-FDDE-F945C9FD2E1C
treatment provided by	Valdenar
scientific name	Maechidius jobiensis Moser, 1920
status

Treatment

Maechidius jobiensis Moser, 1920 View in CoL

Figs 47 View Figs 46–49 , 130 View Figs 121–132 , 220 View Figs 208–225 , 310 View Figs 302–316 , 384, 478

Type material Lectotype [herewith designated]

INDONESIA • ♂; “ Maechidius jobiensis Mos. Type [h] // Jobi Doherty [p] // SYNTYPE Maechidius jobiensis Moser, 1920 labelled by MFNB 2019 View Materials [p, red label]”; ZMHB .

New material

INDONESIA • 1 ♂; “ ♂ // W.Stüber. B.M.1938-481. // DUTCH NEW GUINEA: Hollandia. Jan.1937 - 8. 140°E.long. 3°1’S. 300-600 m.alt.”; BMNH GoogleMaps .

Remarks

Moser (1920: 18) based his description of M. jobiensis on an unstated number of specimens. The lectotype is therefore designated for the single syntype in ZMHB 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 8.70 (lectotype) to 10.00 mm (specimen from Hollandia).

Dorsum and venter uniformly black-brown, appendages and labroclypeus paler brown. Head flattened dorsally on frons, glossy dorsally and ventrally.Male labroclypeus ( Fig. 130 View Figs 121–132 ) deeply and broadly V-shaped emarginate anteriorly, its lateral margins strongly sinuous in both dorsal and lateral views. Anterolateral angles acute, strongly protruding, raised up at angle of about 90° to frons in lateral view. Anterior and lateral margins of labroclypeus smooth. Upper- and underside of labroclypeus with sparse moderately long setae along anterior and lateral margins. Canthus nearly straight in dorsal view. Punctures of frons circular to ovoid, moderately deep, dense; inner margin with thin membrane covered with microscopical velvety pubescence. Intervening spaces glossy to subopaque, variably large. Setae moderately long, erect to suberect. Pronotum transverse, glossy dorsally and laterally. Anterior margin of pronotum broadly emarginate with protruding anterolateral angles, basal margin broadly rounded. Lateral margin of pronotum broadly rounded, crenulate all along ( Fig. 220 View Figs 208–225 ). Long thick erect seta present between every two crenulae. Lateral margin of pronotum slightly sinuous in lateral view. Hypomeron separated from prosternum by moderately low straight carina, with moderately long setae on anterolateral margin opposite to compound eye. Antennal pocket moderately deep. Punctures of pronotal disc annular, larger and stronger oblong than those on head, horseshoe-shaped; inner margin with thin membrane covered with microscopical velvety pubescence. Intervening spaces glossy, variably large. Moderately long suberect seta rises from anterior margin of each puncture, generally surpassing length of corresponding puncture. Scutellar shield broadly triangular, pointed apically. Elytron subopaque, without tracks of longitudinal carinae. Punctures of elytral disc linear (long and narrow), incision-shaped, rather deep ( Fig. 310 View Figs 302–316 ). Intervening spaces much larger than punctures, microscopically wrinkled, subopaque. Elytral setae inconspicuous, suberect, generally surpassing length of incision. Male pygidium flattened dorsally, with large and shallow double annular punctures ( Fig. 478 View Figs 469–486 ). Intervening spaces glossy, much smaller than punctures. Setae of pygidium moderately long, suberect to erect. Male protibia with complete dorsal longitudinal furrow, with two distal teeth of which basal one is broader and stronger obtuse (Fig. 384). Male protibial terminal spur not present. Tarsal claws with pulvilli (in male only?).

Sexual dimorphism

Female is unknown.