Macratria roosilehti, Telnov, 2023

Telnov, Dmitry, 2023, Fourth contribution to the Macratriinae LeConte, 1862 of the Papuan Region and Wallacea (Coleoptera: Anthicidae) with descriptions of sixteen new species, Zootaxa 5361 (1), pp. 1-52 : 31-33

Macratria roosilehti sp. nov.

urn:lsid:zoobank.org:act:60C3F02E-AEB9-4F34-BE59-0666AA15E9A1

( Figs 78–81 )

Type material designated. Holotype ♂ EMNH: INDONESIA SULAWESI 23.03. Gintu road 1°48’S / 120°22’E forest, sweep net bush leg. U.Roosileht [printed].

Derivatio nominis. Patronymic. Named for Uno Roosileht (Estonian Museum of Natural History, Tallinn, Estonia).

Measurements, holotype male, total body length 4.4 mm; head length 0.8 mm, head width across compound eyes 0.7 mm, pronotal length 0.9 mm, maximum pronotal width 0.6 mm, elytral length 2.7 mm, combined maximum elytral width 1 mm.

Description. Male ( Fig. 78 ). Dorsum and venter uniformly black. Mouthparts yellowish, terminal maxillary palpomere brown. Antennomeres 1–3 yellow, remaining brown. Legs black-brown, tarsi brown. Head slightly glossy dorsally and ventrally, elliptical, slightly narrows towards base. Frons moderately narrow, about 0.7× as wide as dorsal eye length. Compound eye large, moderately protruding from lateral outline of head. Interfacetal setae long, dense. Tempus slightly constricted towards base, about one third as long as dorsal eye length. Head base subtruncate, inconspicuously notched medially. Frontoclypeal suture or impression not observed. Head dorsal punctures moderately large, rather deep and dense except on vertex. Intervening spaces smooth, on frons narrower than to as wide as punctures. Head dorsal setae dirty yellowish, suberect, moderately dense, directed posteriad. Tactile setae erect, about same long as ordinary setae, present mainly on head base. Antenna slender, filiform, extending slightly beyond base of elytra when directed posteriad. Basal antennomere elongate, 1.5× as long as antennomere two. Antennomere three about 1.3× as long as antennomere two, about as long as antennomere four. Antennomeres 9–10 widened distally. Terminal antennomere moderately long, somewhat fusiform, acutely pointed, about 1.2× as long as penultimate antennomere. Terminal maxillary palpomere cultriform. Pronotum slightly glossy dorsally and on prothoracic hypomeron, flattened in dorsal aspect, elongate cylindrical, slightly narrower than head across compound eyes. Anterior margin narrow, truncate. Lateral margins slightly constricted laterally anteriad. Dorsal pronotal punctures distinctly larger, denser and deeper than those on head. Intervening spaces smooth to transversely microstrigose, generally narrower than to as wide as punctures. Pronotal dorsal setation dirty yellowish, subdecumbent, long, not concealing dorsal sculpture of pronotum. Tactile setae sparse, erect, not longer than ordinary setae. Scutellar shield small, truncate at posterior margin. Elytron elongate, moderately glossy, not or hardly narrows posteriad. Humerus broadly rounded. Postbasal transverse impression not indicated. Punctures on each elytron in anterior half arranged into five to six incomplete, irregular, in part confused rows; punctures distinctly smaller than those on pronotum. Intervening spaces variably wide, microstrigose. Elytral setation dirty yellowish, moderately dense, long, directed posteriad, not concealing dorsal sculpture of elytron. Lateral humeral stria not shifted dorsad, not visible in dorsal view. Sutural stria complete, moderately broad. Metathoracic wing fully developed. Legs long. Tibial terminal spurs paired, serrate. Metatibial terminal spurs long. Protarsomeres somewhat flattened in dorso-ventral aspect, metatarsomeres elongated, penultimate metatarsomere small. Basal metatarsomere longer than combined length of remaining tarsomeres. All claws strongly dentate at base. Male tergite VII broadly and shallowly emarginate at posterior margin ( Fig. 79 ). Male morphological sternite VII was not available for the present study. Aedeagus ( Figs 80–81 ) long and slender, basale nearly twice as long as apicale. Paramere long and rather think, slightly sinuous, apically rounded, preapically hooked at inner margin. Median lobe tripartite apically, all three lobes nearly equally long, rather slender, apically rounded.

Sexual dimorphism. Female is unknown.

Differential diagnosis. Macratria roosilehti sp. nov. is similar to several Sulawesi and New Guinean congeners and is specifically different in the comparatively short male terminal antennomere, the slightly constricted, rather short tempus and the shape of the terminalia and aedeagus, in particular the preapically hooked inner margin of the paramere. Also see comparative diagnosis of M. tongkonan sp. nov. below.

Ecology. Unknown.

Distribution. Central part of Sulawesi (administrative province of Central Sulawesi).

Figures

FIGURE 78. Macratria roosilehti sp. nov., holotype ♁, habitus, dorsal view.

FIGURES 79–81. Macratria roosilehti sp. nov., holotype ♁. 79—Tergite VII, dorsal view; 80—Aedeagus; 81—Aedeagus, apical portion [not to scale].