Maechidius rugicollis , Moser Determined 1920
Creators: name: Telnov, Dmitry
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Scarabaeidae
Maechidius
Maechidius rugicollis

description: Maechidius rugicollis Moser, 1920
Figs 79, 172–173, 249, 279, 340, 412, 514, 559, 703–705
Type material Lectotype [herewith designated]
PAPUA NEW GUINEA • ♀; “ D.Neu-Guinea [p] Stephansort [h] [black frame] // P. Type Maechidius rugicollis Mos. [h] det. G.Frey,1967/68 [p] // SYNTYPE Maechidius rugicollis Moser, 1920 labelled by MFNB 2020 [p, red label]”; ZMHB.
Paralectotype
PAPUA NEW GUINEA • 1 ♀; “ D.Neu-Guinea [p] Stephansort [h] [black frame] // Maechidius rugicollis Mos. Typus [h]// SYNTYPE Maechidius rugicollis Moser, 1920 labelled by MFNB 2020 [p, red label]”; ZMHB.
New material
INDONESIA • 1 ♂; “ ♂ // DUTCH NEW GUINEA: Cyclops Mts., Sabron. 930 ft. v.1936. L.E.Cheesman. B.M.1936-271. // Maechidius rugicollis, Moser Determined from description. G.J.A.”; BMNH • 4 specs; “ Collection Naturhistorisches Museum Basel // Papua New Guinea Madang Prov. L. Cizek lgt. //S 5°08’, E 145°46’ Baitabag village 50m a.s.l., 1999”; NHMB • 1 spec.; same labels as for preceding; DTC • 4 specs; “ Collection Naturhistorisches Museum Basel // Papua New Guinea Madang Prov. L. Cizek lgt. // Ohu vill. near Gum r. S 5°13’ E 145°41’ I.-II. 2001, 150m”; NHMB.
The lectotype is designated 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. 6.90 mm (lectotype) to 9.00 mm (the largest female from Ohu village)
Dorsum and venter uniformly black-brown, labroclypeus, antennae and legs paler castaneous. Head subopaque, flattened dorsally. Male (Fig. 173) and female labroclypeus very broadly V-shaped emarginate anteriorly (in female in some cases anterior emargination very shallow, Fig. 172), its lateral margins sinuous in both dorsal and lateral views. Anterolateral angles broadly rounded, in male moderately strongly protruding antero-laterally, in female not or hardly protruding. Anterior and lateral margins of labroclypeus smooth. Upper- and underside of labroclypeus with sparse moderately long setae along anterior and lateral margins. Canthus broadly rounded in dorsal view. Punctures of frons irregularly ovoid, large and coarse, moderately deep, their backgrounds shagreened. Intervening spaces microreticulate, smaller than punctures. Head setae dirty yellowish, long to extraordinarily long, suberect, directed posteriad. Longest setae on canthus (one single) and along inner margin of either compound eye. Antenna 9-segmented, club 3-lamellate. Antennomere 2 short, in male slightly longer than wide, in female about as long as wide. Pronotum transverse, flattened dorsally, subopaque dorsally and laterally. Anterior margin of pronotum rather shallowly emarginate with slightly protruding anterolateral angles, basal margin very broadly rounded. Lateral margin of pronotum rounded, stronger constricted anteriad than towards base, crenulate all along (Fig. 249). Extraordinarily long curved erect seta present between every two crenulae, at least as long as longitudinal diameter of compound eye in fresh specimens. Lateral margin of pronotum broadly arched in lateral view. Punctures of pronotal disc large and coarse, irregularly circular to ovoid, dense. Intervening spaces in part flat and microreticulate, in part broad and globose, glossy, variably large. Hypomeron nearly fused to prosternum, carina not present or very inconspicuous, place of fusion provided with a row of delicate whitish setae; moderately long setae on anterolateral margin of hypomeron opposite of compound eye (Fig. 279). Setation as on head, generally whitish. Scutellar shield rounded apically. Elytron subopaque, without tracks of longitudinal carinae. Punctures of elytral disc double. Ordinary punctures of disc large, shallow and rather dense, irregular in size and shape. Each ordinary puncture supplemented with a shallow linear (narrow and long) incisionshaped puncture (Fig. 340). Intervening spaces in part microreticulate, in part glossy, generally larger than ordinary punctures. Elytral setae moderately long, appressed to suberect. Lateral margin of elytra with extraordinarily long erect setae. Male and female pygidium flattened dorsally, with large shallow annular punctures (Fig. 514). Intervening spaces microreticulate, subopaque. Setae of pygidium very long, suberect; each seta rises from anterior margin of corresponding puncture. Protibia rather slender, with two large distal external teeth and much smaller stronger obtuse third one (median on protibia) (Fig. 412); distal tooth in male lobe-like prolonged anteriad. Protibial terminal spur not present in both sexes. Distal margin of metatibia in both sexes with projection over basal metatarsomere. Tarsal claws with pulvilli. Spiculum gastrale as in Fig. 559. Aedeagus as in Figs 703–705.
Sexual dimorphism
Female lamellae of antennal club comparatively shorter; female labroclypeus comparatively shallower emarginate anteriorly; female distal external tooth of protibia less strongly prolonged.
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 102-104, DOI: 10.5852/ejt.2020.721.1127, http://zenodo.org/record/4122118