Macratria korowai, 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 : 16-18

Macratria korowai sp. nov.

urn:lsid:zoobank.org:act:5CE2CE0F-5A5B-44C2-BF97-7B893B2D189D

( Figs 34–42 )

Type material designated. Holotype ♂ NME: INDONESIA E, New Guinea, Papua Prov., Korowai area, Mbaigun vill., 05°13’25’’S 139°51’04’’E, 60 m, XI.1998, primary lowland rainforest, from vegetation, leg. L.Wagner [printed].

Paratypes 6♀ specimens. 4♀ NME & 2♀ DTC: same label as holotype.

Derivatio nominis. Named after the Korowai language and tribe. Noun in apposition.

Measurements, holotype male, total body length 3.25 mm; head length 0.6 mm, head width across compound eyes 0.6 mm, pronotal length 0.75 mm, maximum pronotal width 0.55 mm, elytral length 1.9 mm, combined maximum elytral width 0.85 mm. Female paratypes 3.4–4.1 mm long.

Description. Male ( Fig. 34 ). Head blood-red, pronotum and prothoracic hypomeron black to rufous black. Elytra black-brown. Mouthparts including maxillary palpi, antenna and legs yellow, metathoracic tibia brown to yellowish brown. All coxae and trochanters reddish brown, femora shortly brown at base. Venter uniformly dark brown to reddish brown, visible terminalia paler. Head slightly to moderately glossy dorsally and ventrally, broadly subtriangular, dorsally flattened. Frons moderately narrow, about 0.6–0.7× as wide as dorsal eye length. Compound eye large, occupying nearly whole lateral side of head beyond antennal insertion, strongly protruding from lateral outline of head, about 8–9× as long as rounded, short tempus. Interfacetal setae moderately long, dense. Head base broadly rounded to subtruncate, medially broadly, shallowly notched. Frontoclypeal suture or impression not observed. Head dorsal punctures variably large and dense, rather shallow. Intervening spaces smooth, about as wide as to twice as wide as punctures. Head dorsal setae whitish to dirty yellowish, subdecumbent, moderately dense, not concealing dorsal surface of head. Tactile setae sparse, erect, not longer than ordinary setae. Antenna slender and strongly filiform, slightly thickened at apex, hardly extending towards base of pronotum when directed posteriad. Basal antennomere slightly elongate, about 1.3× as long as antennomere two. Antennomere three about 1.3× as long as antennomere two, same length as antennomere four. Antennomeres 3–8 elongate, 9–10 thickened and widened distally. Terminal antennomere long and thickened, acutely pointed, about 3× as long as penultimate antennomere. Terminal maxillary palpomere cultriform. Pronotum subopaque dorsally, flattened in dorsal aspect, elongate elliptical, slightly narrower than head across compound eyes. Anterior margin rounded, medially truncate. Lateral margins slightly constricted laterally posteriad. Dorsal pronotal punctures much larger and denser than those on head, moderately deep. 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 six incomplete, poorly defined, flat, irregularly shaped rows. Intervening spaces between rows smooth to minutely punctate. Elytral setation dirty yellowish, moderately long and dense, directed posteriad, not concealing dorsal sculpture of elytron. Those setae adjacent to suture directed slightly obliquely laterally. Lateral humeral stria not shifted dorsad, not visible in dorsal view. Sutural stria complete, rather broad. Metathoracic wing fully developed. Legs moderately long. Femur clavate. Protarsus somewhat widened. Tibial terminal spurs paired, margins serrate. Metatibial terminal spurs long. Basal metatarsomere distinctly longer than combined length of remaining tarsomeres. All claws strongly dentate at base. Procoxal rest subquadrate. Metaventrite shallowly longitudinally impressed all along at place of metathoracic discrimen. Male tergite VII broadly rounded at posterior margin ( Fig. 36 ). Male morphological sternite VII short and broad, somewhat broadly and shallowly emarginate medially at posterior margin ( Fig. 37 ). Tergite VIII, morphological sternites VIII and IX as in Fig. 38 . Aedeagus ( Figs 39–40 ) elongate and slender, basale about 1.5× as long as apicale. Apical shape of parameres unknown (both parameres damaged in the only available male specimen). Median lobe apically strongly narrow, pointed, unipartite.

Sexual dimorphism. Female ( Fig. 35 ) generally larger, head significantly stronger widened, terminal antennomere about 1.7× as long as penultimate antennomere, pronotum hardly narrower than head across eyes, tergite VII subtruncate at posterior margin ( Fig. 41 ), morphological sternite VII short and broad, medially rounded at posterior margin ( Fig. 42 ).

Differential diagnosis. Macratria korowai sp. nov. resembles several species from the southern lowlands of New Guinea, in particular M. brazzaensis Telnov, 2012 , M. marind Telnov, 2017 , M. spathulata Telnov, 2012 and M. perkovskyi sp. nov. (described herein; northern lowlands of New Guinea), but clearly differs from these and other congeners primarily in the shape of the male terminalia and aedeagus.

Ecology. Collected from undergrowth in primary lowland rainforest.

Distribution. Southern lowlands, New Guinea.

Figures

FIGURES 34–35. Macratria korowai sp. nov. 34—Holotype ♁, habitus, dorsal view; 35—Paratype ♀, habitus, dorsal view [not to scale].

FIGURES 36–42. Macratria korowai sp. nov. 36—Holotype ♁, tergite VII, dorsal view; 37—Same, morphological sternite VII, ventral view; 38—Same, tergite VIII, morphological sternites VIII and IX, ventral view; 39—Same, aedeagus (apices of the parameres broken!); 40—Same, aedeagus, apical portion (apices of the parameres broken!); 41—Paratype ♀, tergite VII, dorsal view; 42—Same, morphological sternite VII, ventral view [not to scale].