Macratria perkovskyi, 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 : 25-27

Macratria perkovskyi sp. nov.

urn:lsid:zoobank.org:act:971AD4FF-DA0C-449E-AD21-6C165626727B

( Figs 65–69 )

Type material designated. Holotype ♂ NME: INDONESIA E, New Guinea, Papua Prov., Sarmi 17 km SSE, 01°58’00’’S 138°51’26’’E, 30 m, 27.III.1998, stream & swampy sago forest [printed].

Derivatio nominis. Patronymic. Named for Evgeny E. Perkovsky (I. I. Schmalhausen Institute of Zoology, Kyiv, Ukraine).

Measurements, holotype male, total body length about 2.7 mm; head length 0.6 mm, head width across compound eyes 0.5 mm, pronotal length 0.6 mm, maximum pronotal width 0.45 mm, elytral length 1.55 mm, combined maximum elytral width 0.7 mm.

Description. Male ( Fig. 65 ). Head and pronotum dark red-brown dorsally and ventrally, elytral black-brown. Mouthparts including maxillary palpi and antenna yellow. Pro- and mesothoracic legs yellow, coxa and trochanter reddish brown. Metathoracic leg dark brown, two ultimate metatarsomeres yellow. Venter uniformly reddish brown except for yellow tips of visible abdominal terminalia. Head moderately glossy dorsally and ventrally, subtriangular, distinctly widened towards base. Frons narrow, nearly 0.5× as wide as dorsal eye length. Compound eye large, occupying most of lateral side of head beyond antennal insertion, strongly protruding from lateral outline of head. Interfacetal setae long, dense. Tempus subparallel, short, about 0.3× as long as dorsal eye length. Head base subtruncate, broadly rounded at tempus, medially shortly notched. Frontoclypeal suture or impression not observed. Head dorsal punctures variably large but generally small and rather shallow, denser on anterior part of frons compared to vertex. Intervening spaces smooth, about as wide as to 3× as wide as punctures. Head dorsal setae dirty yellowish, subdecumbent, moderately dense, directed in part obliquely laterally, in part longitudinally or slightly obliquely posteriad. Tactile setae sparse, erect, not or slightly longer but thinner compared to ordinary setae. Antenna slender and strongly filiform, slightly thickened at apex, extending towards mesocoxal cavity when directed posteriad. Basal antennomere elongate, slightly shorter than antennomere two. Antennomere three slightly shorter than antennomere two, about as long as antennomere four. Antennomeres 3–9 long and slender, 9–10 widened distally. Terminal antennomere long and slender, acutely pointed, about twice as long as penultimate antennomere. Terminal maxillary palpomere subcultriform. Pronotum subopaque dorsally and on prothoracic hypomeron, flattened in dorsal aspect, cylindrical, distinctly narrower than head across compound eyes. Anterior margin narrow, subtruncate. Lateral margins slightly constricted laterally anteriad. Dorsal pronotal punctures much larger and denser than those on head, moderately deep, subconfluent. Intervening spaces somewhat raised, in part microcorrugate in part smooth, generally narrower than punctures. Pronotal dorsal setation dirty yellowish, moderately dense, subdecumbent, not fully concealing dorsal sculpture of pronotum. Tactile setae sparse, erect, not longer than ordinary setae. Scutellar shield small, truncate at posterior margin. Elytron moderately elongate, subopaque, gradually, slightly narrows posteriad. Humerus broadly rounded. Postbasal transverse impression not indicated. Punctures on each elytron in anterior half arranged into seven incomplete, flat, rather regular rows. Intervening spaces between rows microstrigose. Elytral setation dirty yellowish, dense, moderately long, directed slightly obliquely laterally, appressed, effectively concealing dorsal sculpture of elytron. Somewhat thinner, subdecumbent, strongly posteriaddirected setae arranged in rows, raising from punctures in rows. Lateral humeral stria inconspicuous, not visible in dorsal view. Sutural stria complete, rather broad. Metathoracic wing fully developed. Legs moderately long. Tibial terminal spurs paired, serrate. Pro- and mesotarsus elongates, about as long as corresponding tibia. Basal metatarsomere slightly longer than combined length of remaining tarsomeres. All claws strongly dentate at base. Male tergite VII broadly rounded at posterior margin ( Fig. 66 ). Morphological sternite VII short and broad, broadly emarginate at posterior margin ( Fig. 67 ). Aedeagus ( Figs 68–69 ) long and slender, basale about 1.3× as long as apicale. Paramere narrow, apically narrowly rounded (in dorsal view). Median lobe narrow, unipartite, apically shallowly emarginate.

Sexual dimorphism. Female is unknown.

Differential diagnosis. Macratria perkovskyi sp. nov. differs from all known congeners in the shape of the male morphological sternite VII in the combination with the shape of the male aedeagus (the narrow, long parameres and the unipartite, apically emarginate median lobe).

Ecology. Collected from leaves of vegetation in a sago swamp.

Distribution. Northern lowlands, New Guinea.

Figures

FIGURE 65. Macratria perkovskyi sp. nov., holotype ♁, habitus, dorsal view.

FIGURES 66–69. Macratria perkovskyi sp. nov., holotype ♁. 66—Tergite VII, dorsal view; 67—Morphological sternite VII, ventral view; 68—Aedeagus; 69—Aedeagus, apical portion [not to scale].