Macratria Newman 1838
Creators: name: Telnov, Dmitry
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Anthicidae
Macratria

description: Macratria anus sp. nov.
urn:lsid:zoobank.org:act: 9B654EEF-05AE-4865-8749-67EE144AFE61
(Figs 1–7)
Type material designated. Holotype ♂ NME: 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].
Paratypes 4♂ specimens. 2 NME & 2 DTC: same label as holotype.
Derivatio nominis. Named after the Anus language of small island group offshore northern coast of the Indonesian Papua near the locality of the new species. Noun in apposition.
Measurements, holotype male, total body length 4 mm; head length 0.8 mm, head width across compound eyes 0.7 mm, pronotal length 0.95 mm, maximum pronotal width 0.6 mm, elytral length 2.3 mm, combined maximum elytral width 0.9 mm. Male paratypes 3.6–3.9 mm long.
Description. Male (Figs 1–2). Dorsum uniformly black, venter uniformly brown to black-brown. Mouthparts including maxillary palpi, antennomeres 1–8 and legs yellow, remaining antennomeres brown to yellowish brown. Tibiae shortly brown at contact point with corresponding femora, coxa and trochanters reddish to reddish black. Head subopaque dorsally, moderately glossy ventrally, elliptical. Frons narrow, about 0.5–0.6× as wide as dorsal eye length. Compound eye large, occupying whole lateral side of head beyond antennal insertion, moderately protruding from lateral outline of head, about 4.2× 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, somewhat less dense on median area of head. Head dorsal setae greyish, subdecumbent, dense, not concealing dorsal surface of head. Tactile setae sparse, erect, longer than ordinary setae, mainly arranged on head base. Antenna slender and strongly filiform, slightly thickened at apex, hardly extending towards base of pronotum when directed posteriad. Basal antennomere elongate, about 1.2–1.3× as long as antennomere two. Antennomere three about 1.5× as long as antennomere two, about same long as antennomere four. Antennomeres 3–8 elongate, 9–10 slightly widened distally. Terminal antennomere elongate fusiform, obtusely pointed, about twice as long as penultimate antennomere. Terminal maxillary palpomere shortly cultriform. Pronotum subopaque dorsally, flattened in dorsal aspect, elongate elliptical, narrower than head across compound eyes. Anterior margin truncate. Lateral margins slightly constricted laterally posteriad, rounded anteriad. Dorsal pronotal punctures much larger and denser than those on head, deep. Intervening spaces microstrigose, distinctly narrower than punctures. Pronotal dorsal setation dirty yellowish, dense, subdecumbent, not fully concealing dorsal sculpture of pronotum. Basal area of pronotum with rather dense, appressed, whitish setae. Tactile setae sparse, erect to suberect, 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 six incomplete, poorly defined, flat, irregularly shaped rows. Intervening spaces between rows minutely punctate to microstrigose. Elytral setation dirty yellowish, moderately long and dense, directed posteriad, not fully concealing dorsal sculpture of elytron. Those setae in rows of punctures longer and thinner, directed strongly posteriad. Tactile setae sparse, erect to suberect. Lateral humeral stria not shifted dorsad, not visible in dorsal view. Sutural stria complete, rather broad. Metathoracic wing fully developed. Legs long. Femur clavate. Tibial terminal spurs paired, margins serrate. Tarsomeres of all legs elongate, protarsus longer than corresponding tibia. Basal metatarsomere slightly longer than combined length of remaining metatarsomeres. All claws strongly dentate at base. Male tergite VII elongate, narrows posteriad, shallowly emarginate at posterior margin (Fig. 3). Male morphological sternite VII rather short and broad, with paired, moderately long, laterally and apically densely setose lateral prong, posterior margin between prongs producing posteriad, truncate and densely setose (Fig. 4). Male tergite VIII and morphological sternite VIII as on Fig. 5. Aedeagus (Figs 6–7) long and rather slender, basale slightly more than twice as long as apicale. Paramere apically rounded. Median lobe apically tripartite.
Sexual dimorphism. Female is unknown.
Differential diagnosis. Macratria anus sp. nov. appears similar to several congeners with the modified male morphological sternite VII (provided with two simple prongs) from the gestroi species-group. The new species differs from all congeners in the combination of the following features: the comparatively short male terminal antennomere, the narrow frons, the shape of the male terminalia and aedeagus. Additionally, the similar species differ from M. anus sp. nov. as follows: M. densata Pic, 1900 (southern lowlands of New Guinea) – the male morphological sternite VII with a long median protrusion, the lateral prongs long and thick, the male tergite VII subtriangular, apically pointed, the aedeagus different; M. eparaksts Telnov, 2017 (southern lowlands of New Guinea) – the male morphological sternite VII with the pointed median protrusion at the posterior margin, the male tergite VII pointed apically; M. fore Telnov, 2011 (Central Cordillera of New Guinea) – the male morphological sternite VII with the lateral prongs shortened, the aedeagus different; M. gestroi Pic, 1900 (Papuan Peninsula of New Guinea) – the male morphological sternite VII with subtruncate, shortly setose median protrusion at posterior margin, the male tergite VII truncate at posterior margin, the aedeagus different; M. grekei Telnov, 2011 (southern New Guinea) – the male morphological sternite VII with a long median protrusion at the posterior margin, its lateral prongs long, the aedeagus different; M. laszlowagneri Telnov, 2011 (Central Moluccas: Buru and Seram) – the male morphological sternite VII truncate medially at posterior margin, the male metatibia with modifications, the aedeagus different; M. misoolensis Telnov, 2011 (Raja Ampat Archipelago: Misool Island) – the male morphological sternite VII with a V-shaped median protrusion at posterior margin, the aedeagus different; M. obiensis Telnov, 2017 (North Moluccas: Obi Islands) – the male morphological sternite VII rounded medially at posterior margin, the aedeagus different; M. pamelaschmidti Telnov, 2011 (Solomon Islands: Guadalcanal Island) – the male morphological sternite VII broad at the posterior margin between the lateral prongs, subtruncate, the male tergite VII triangular, pointed apically; M. pseudodensata Telnov, 2012 (southern lowlands of New Guinea) – the male morphological sternite VII broad at the posterior margin between the lateral prongs, the male terminal antennomere 1.5-1.7× as long as combined length of the corresponding antennomeres 9–10; M. sahu Telnov, 2017 (southern lowlands of New Guinea) – the male morphological sternite VII emarginate medially at posterior margin, its lateral prongs with very long setae, the aedeagus different; M. sepik Telnov, 2011 (northern lowlands of New Guinea) – the male morphological sternite VII with a subtruncate median protrusion at the posterior margin, the aedeagus different, the male terminal antennomere strongly elongated; M. subguttata Pascoe, 1860 (North Moluccas: Bacan, Halmahera, Ternate) – the lateral prongs of the male morphological sternite VII apically slightly emarginate (not evenly rounded); the male metatibia with modifications, the aedeagus different; M. wahgi Telnov, 2011 (Central Cordillera of New Guinea) – the male morphological sternite VII with a rounded median protrusion at the posterior margin, the male terminal antennomere strongly elongated; M. yapena Telnov, 2011 (Cenderawasih Bay: Yapen Island) – the male morphological sternite VII with an U-shaped median protrusion at posterior margin, its lateral prongs long and thick, the male tergite VII slender, the aedeagus different.
Ecology. Collected on a hot, open riverbank from underside and inside of leaf sheaths of reed-like riverside vegetation resembling Saccharum.
Distribution. Northern lowlands, New Guinea.
description: Published as part of Telnov, Dmitry, 2023, Fourth contribution to the Macratriinae LeConte, 1862 of the Papuan Region and Wallacea (Coleoptera: Anthicidae) with descriptions of sixteen new species, pp. 1-52 in Zootaxa 5361 (1) on pages 2-4, DOI: 10.11646/zootaxa.5361.1.1, http://zenodo.org/record/10145188