Maechidius opatroides Arrow, 1941

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 : 85-86

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.4344497
persistent identifier	https://treatment.plazi.org/id/1A3787F6-9D48-920E-FE6D-F9A2C9C72E60
treatment provided by	Valdenar
scientific name	Maechidius opatroides Arrow, 1941
status

Treatment

Maechidius opatroides Arrow, 1941 View in CoL comb. rest.

Figs 70 View Figs 70–73 , 150 View Figs 145–156 , 238 View Figs 226–241 , 329 View Figs 317–332 , 402, 498

Type material

Lectotype [herewith designated]

INDONESIA • ♀; “Type [p, label circular, red frame] // SYNTYPE [p, label circular, blue frame] // N. DUTCH NEW GUINEA: Waigeu. Camp Nok. 2,500ft. iv.1938. L.E.Cheesman. B.M.1938-593. [p] // Coniomaechidius opatroides , Type Arrow [h]”; BMNH [the name “ Coniomaechidius ”, which appears on label, was never published].

Paralectotypes

INDONESIA • 3 ♀♀; “ SYNTYPE [p, label circular, blue frame] // N. DUTCH NEW GUINEA: Waigeu. Camp Nok. 2,500ft. iv.1938. L.E.Cheesman. B.M.1938-593. [p]”; BMNH .

New material

INDONESIA • 1 ♀; “N.DUTCH NEW GUINEA: Waigeu.Camp I.Mt.Nok. 2,500ft. v.1938. L.E.Cheesman. B.M.1938-593. [p] // not a syntype [h] M. E. Bacchus det. 196[p] 9[h]”; BMNH .

Remarks

The lectotype is designated in order to enhance the stability of nomenclature and fix the specimen I based my redescription on.

Arrow (1941: 454) described this species from four female specimens, not designating the holotype. The BMNH specimen with Arrow’s handwriting “type” is herewith designated as the lectotype.

Description

Dorsum densely covered with dirty yellowish microscopical velvety pubescence. Female labroclypeus ( Fig. 150 View Figs 145–156 ) broadly emarginate on anterior margin, its lateral margins nearly straight in dorsal, slightly sinuous in lateral view. Anterolateral angles of labroclypeus acute, rather strongly protruding. Head dorsal punctures dense, circular to ovoid, deep. Intervening spaces generally smaller than punctures. Setae scale-like, suberect, clavate, small to rather long. Pronotum anterior and basal margins sinuous in dorsal view. Lateral margin of pronotum somewhat flattened and laterally expanding in anterior half (in dorsal view), strongly sinuous in dorsal view, broadly rounded in anterior ¾, emarginate prebasally and again widened at base. Lateral margin of pronotum nearly straight in lateral view, delicately crenulate all along ( Fig. 238 View Figs 226–241 ). A scale-like curved clavate seta present between every two crenulae. Hypomeron flange-like protruding, emarginate opposite compound eye. Antennal pocket deep. Pronotal punctures elongate ovoid, deep. Intervening spaces generally larger than punctures. Lateral sides of pronotum covered with dense brush-like clusters of setae reminiscent of mammal fur ( Fig. 238 View Figs 226–241 ), dorsal surface fully hidden. Setae scale-like, clavate, suberect; each seta rises from anterior margin of corresponding puncture, not surpassing its length. Elytral punctures elongate, irregularly sized and shaped, deep ( Fig. 329 View Figs 317–332 ). Intervening spaces much larger than punctures. Elytral setae scale-like, clavate, appressed, not surpassing length of corresponding punctures. Longer suberect scale-like clavate setae arranged in irregular longitudinal rows – single sutural and two doubled rows. Female pygidium covered with furlike pubescence, deeply densely punctate with ovoid punctures ( Fig. 498 View Figs487–503 ). Setae of pygidium scale-like, elongate, suberect, rather long. Female protibia with two distal teeth on external margin, both nearly acute (Fig. 402).

Sexual dimorphism

Male is unknown.