Maechidius boessnecki sp. nov.

urn:lsid:zoobank.org:act: C4A68BE8-8247-4C13-93A5-DEB150FB8B09

Figs 28, 105, 205, 295, 367, 461, 589–591

Differential diagnosis

This species differs from all congeners in the shape of the aedeagus.

Etymology

Patronymic. This species is named in honour of Ulrich Bössneck (4 Mar. 1960 – 13 Sep. 2019; Erfurt, Germany), a famous malacologist, respected colleague and my friend.

Type material

Holotype

INDONESIA • ♂; “Drs. Sarasin N. Celebes [p] Matinang [h]// 10575. [h, label yellowish]// Staatl. Museum für Tierkunde Dresden [p]”; SNSD.

Description

MEASUREMENTS. Holotype, total body length 8.45 mm. Head 1.70 mm long, across eyes 1.80 mm wide. Pronotum 1.80 mm long, maximum width 2.90 mm. Elytral length 4.95 mm, maximum combined width 3.15 mm.

Dorsum black-brown, labroclypeus, antennae, legs and venter brown. Head glossy dorsally, slightly convex on frons. Male labroclypeus (Fig. 105) very shallowly broadly emarginate on anterior margin, its lateral margins slightly sinuous in both dorsal and lateral views. Anterolateral angles of labroclypeus obtuse, hardly protruding anteriad. Compound eye large, occupy about half side of head. Canthus nearly straight in dorsal view. Head punctures ovoid, deep and dense, filled with microscopical velvety pubescence. Intervening spaces glossy, much smaller than punctures. Head setae suberect, thickened, moderately long, longer on frons than on labroclypeus; each seta rises from anterior margin of corresponding puncture. Antenna 9-segmented, club 3-lamellate. Pronotum transverse, glossy dorsally and laterally. Anterior margin of pronotum broadly emarginate, basal margin very broadly rounded. Lateral margin of pronotum in dorsal view broadly rounded, maximum width slightly postmedially, crenulate all along (Fig. 205). Moderately long curved suberect seta present between every two crenulae. Lateral margin of pronotum nearly straight in lateral view. Pronotal punctures ovoid, deep and dense, filled with microscopical velvety pubescence. Intervening spaces glossy, much smaller than punctures, in part wrinkled. Lateral and basal margins, antero- and posterolateral angles partly covered with microscopical velvety pubescence. Pronotal setae inconspicuous, suberect; each seta rises from anterior margin of corresponding puncture, surpassing its length. Hypomeron flanged-like protruding, slightly emarginate and long setose opposite to compound eye. Antennal pocket deep. Elytron glabrous, with vague track of one glabrous longitudinal carina. Sutural carina not indicated. Elytral punctures irregularly ovoid, deep and dense, filled with microscopical velvety pubescence (Fig. 295), those on elytral disc arranged in 12 in part irregular longitudinal rows, those along lateral sides confused. Intervening spaces glossy, generally larger than punctures. Setae of elytra inconspicuous, appressed; minute seta rises from anterior margin of each puncture, not surpassing its length (Fig. 295). Several longer suberect setae arranged in 5–6 inconspicuous longitudinal rows. Lateral margin of elytron with row of short suberect setae. Male pygidium flattened dorsally, with moderately large dense annular punctures (Fig. 461). Setae of pygidium rise from anterior margin of corresponding punctures, generally suberect to erect and longer than corresponding punctures. Male protibia with two distal teeth on external margin, of which distal one acute (Fig. 367). Male protibial terminal spur strongly curved. Spiculum gastrale as in Fig. 461. Aedeagus as in Figs 589–591.

Sexual dimorphism

Female is unknown.

Ecology

Unknown.

Distribution

Northern peninsula of Sulawesi.