Macratria bonggo, 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 : 9-11

Macratria bonggo sp. nov.

urn:lsid:zoobank.org:act:4B73BBF9-4793-462A-ABF3-523DFBD77F8A

( Figs 13–21 )

Type material designated. Holotype ♂ NME: INDONESIA E, New Guinea, Papua Prov., Bonggo 26 km SE, Toareng River , 02°25’15’’S 139°46’25’’E, 25 m, 28.III.1998, river valley, from riverside vegetation [printed]. The apical half of the right elytron is missing.

Paratypes 8♂ specimens. 5 NME & 2 DTC: same label as holotype; 1 DTC: INDONESIA E, New Guinea, Papua Prov., Sarmi 76 km ESE, Biri River , 02°11’09’’S 139°20’57’’E, 27 m, 28.III.1998, river valley, from riverside vegetation [printed] .

Derivatio nominis. Named after the Bonggo language of the northern coast of the Indonesian Papua. Noun in apposition.

Measurements, holotype male, total body length 4.25 mm; head length 0.8 mm, head width across compound eyes 0.7 mm, pronotal length 1.05 mm, maximum pronotal width 0.7 mm, elytral length 2.4 mm, combined maximum elytral width 1.1 mm. Male paratypes 3.6–4.1 mm, female paratypes 3.5–3.8 mm long.

Description. Male ( Figs 13–14 ). Dorsum and venter uniformly black. Mouthparts including maxillary palpi and antennomeres 1–8 orange-yellow, remaining antennomeres brown. Legs entirely yellow to orange-yellow, coxae and trochanters brown or metathoracic leg entirely brown. Head subopaque dorsally, moderately glossy ventrally, nearly circular. Frons narrow, about 0.5× as wide as dorsal eye length. Compound eye large, occupying whole lateral side of head beyond antennal insertion, strongly protruding from lateral outline of head, about 4× as long as rounded, short tempus. Interfacetal setae moderately long, dense. Head base broadly rounded to subtruncate, medially with an inconspicuous notch. Frontoclypeal suture or impression not observed. Head dorsal punctures dense, moderately deep. Intervening spaces smooth, narrower than to as wide as punctures, less dense on median area of head. Head dorsal setae whitish to greyish, subdecumbent, dense, not concealing dorsal surface of head. Tactile setae sparse, erect, yellowish, not longer than ordinary setae. Antenna slender and strongly filiform, slightly thickened at apex, extending slightly beyond elytral base when directed posteriad. Basal antennomere elongate, about 1.5–1.6× as long as antennomere two. Antennomere three about 1.3× as long as antennomere two, 0.8× as long as antennomere four. Antennomeres 3–8 elongate, 9–10 slightly widened distally. Terminal antennomere elongate fusiform, acutely pointed, about twice as long as penultimate antennomere. Terminal maxillary palpomere shortly cultriform. Pronotum subopaque dorsally, flattened in dorsal aspect, broadly elliptical, slightly narrower than head across compound eyes. Anterior margin broad, rounded. Lateral margins slightly constricted laterally anteriad and posteriad. Dorsal pronotal punctures much larger and denser than those on head, deep. Intervening spaces smooth, distinctly narrower than punctures. Pronotal dorsal setation intermixed whitish and dirty yellowish, dense, subdecumbent, not fully concealing dorsal sculpture of pronotum. Basal area of pronotum covered by dense, appressed, whitish setae. Tactile setae sparse, erect, not longer than ordinary setae. Scutellar shield small, truncate at posterior margin. Elytron moderately elongate, subopaque, not or hardly narrows posteriad. Humerus broadly rounded. Postbasal transverse impression not indicated. Punctures on each elytron in anterior half arranged into seven incomplete, poorly defined, flat, irregularly shaped rows. Intervening spaces between rows smooth to microstrigose. Elytral setation dirty yellowish, moderately long and dense, directed posteriad, not concealing dorsal sculpture of elytron. Those setae in rows of punctures directed strongly posteriad. 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.All claws dentate at base. Male tergite VII rounded at apical margin, provided with long setae ( Fig. 15 ). Male morphological sternite VII broadly subtriangular, broadly emarginate and long setose at posterior margin ( Fig. 16 ). Tergite VIII, morphological sternites VIII and IX as in Fig. 17 . Aedeagus ( Figs 18–21 ) with apicale about half length of basale, paramere rounded apically with preapical “hook” (in lateral view), median lobe apically strongly narrows and elongate, tripartite.

Sexual dimorphism. Female is unknown.

Intraspecific variability. One male paratype with distinctly less slender pronotum.

Differential diagnosis. Macratria bonggo sp. nov. appears similar to several congeners but differs specifically in the shape of the male terminalia and aedeagus, in particular due to the peculiarly widened, curved and preapically hooked (in lateral view) paramere. The apical parameral “hook” slightly resembles that in M. nguzunguzu Telnov, 2011 ( Solomon Islands) and M. weberi Telnov, 2011 (Central Cordillera of New Guinea), but is clearly different.

Ecology. Collected on a hot, open riverbank from underside and inside of leaf sheaths of Saccharum sp. reed-like riverside vegetation.

Distribution. Northern lowlands, New Guinea.

Figures

FIGURES 13–14. Macratria bonggo sp. nov., paratype ♁. 13—Habitus, dorsal view; 14—Forebody and left antenna, dorsal view [not to scale].

FIGURES 15–21. Macratria bonggo sp. nov., paratype ♁. 15—Tergite VII, dorsal view; 16—Morphological sternite VII, ventral view; 17—Tergite VIII, morphological sternites VIII and IX, ventral view; 18—Aedeagus; 19—Aedeagus, lateral view; 20—Aedeagus, apical portion; 21—Aedeagus, apical portion, lateral view [not to scale].