Macratria longitarsis, 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 : 24-25

Macratria longitarsis sp. nov.

urn:lsid:zoobank.org:act:88550439-B5D3-4FFE-9C0C-BE2C5E94133B

( Figs 54–64 )

Type material designated. Holotype ♂ NME: INDONESIA E, New Guinea, Papua Prov., Star Mountains, Oksibil 13.5–19.5 km SSE, 04°59’33’’S 140°42’02’’E to 05°03’02’’S 140°43’16’’E, 710-830- 365 m, 14.III.1998, primary lowland rainforest. [printed].

Paratypes 12 specimens. 2♀ NME & 1♂, 1♀ DTC: same label as holotype; 3♂, 2♀ NME & 2♂, 1♀ DTC: INDONESIA E, New Guinea, Papua Prov., Star Mountains, Oksibil 5-6 km SSE, 4°57’14’’S 140°39’15’’E, ~ 1320- 1360 m, 09.III.1998, primary lower montane rainforest on limestone [printed] .

Derivatio nominis. From Latin “longitarsis ” (with long legs) to point on peculiarly elongate tarsi of the new species.

Measurements, holotype male, total body length 4.9 mm; head length 0.9 mm, head width across compound eyes 0.8 mm, pronotal length 1.1 mm, maximum pronotal width 0.8 mm, elytral length 2.9 mm, combined maximum elytral width 1.2 mm. Selected male paratypes 4.6–4.8 mm, selected female paratypes 4.7–5.2 mm long.

Description. Male ( Figs 54–55 ). Head reddish brown dorsally and ventrally, pronotum dorsally brown, reddish brown in anterior part, elytra brown. Mouthparts yellowish brown, maxillary palpi and antennomeres 1–8 yellow, remaining antennomeres yellowish brown. Legs yellow to yellowish brown, metatibia and tarsus brown. Pro-, meso-, metathorax and two first visible abdominal ventrites brown, remaining visible ventrites yellowish to reddish brown. Head glossy dorsally and ventrally, subtriangular, distinctly widened at base. Frons 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 5–5.2× as long as short tempus. Interfacetal setae long, dense. Frontoclypeal suture or impression not observed. Posterior temporal angle broadly rounded. Head base truncate, medially broadly, shallowly notched. Head dorsal punctures variably large, moderately deep, denser on frons compared to vertex. Intervening spaces smooth, generally as wide as to twice as wide as punctures. Head dorsal setae yellowish, subdecumbent, rather dense. Several longer, erect tactile setae present.Antenna slightly thickened except for antennomeres 1–3, hardly extending towards mesocoxal cavity when directed posteriad. Basal antennomere elongate, twice as long as antennomere two. Antennomere three slightly longer than antennomere two, slightly shorter than antennomere four. Antennomeres 4–8 peculiarly flattened in dorso-ventral aspect and widened (antennomere four widened distally only), slightly glossy, sparser setose compared to antennomeres 9–11. Antennomeres 9–11 cylindrical, not flattened, antennomere ten distally widened. Terminal antennomere long and slender, bluntly pointed, about twice to 2.1× as long as penultimate antennomere. Terminal maxillary palpomere cultriform. Pronotum glossy dorsally and on prothoracic hypomeron, flattened in dorsal aspect, as wide as to slightly wider than head across compound eyes. Anterior and lateral margins broadly rounded, slightly constricted laterally at base. Dorsal pronotal punctures denser and rougher than those on head, moderately deep, variably large, subconfluent. Intervening spaces smooth to microstrigose, generally narrower than punctures. Pronotal dorsal setation similar to that on head, somewhat denser, longer and stronger appressed, not fully concealing dorsal sculpture of pronotum. Setae at posterolateral pronotal angles and base longer than those on pronotal disc. Scutellar shield small, truncate at posterior margin. Elytron elongate, subopaque to slightly glossy, slightly and gradually narrows posteriad. Humerus broadly rounded. Postbasal transverse impression not indicated. Punctures on each elytron in anterior half arranged into six complete and one short scutellar rows, flat, irregularly shaped, subconfluent in corresponding rows. Intervening spaces between rows minutely punctate. Elytral setation dense, variably long, directed posteriad, effectively concealing dorsal sculpture of elytron. Those setae adjacent to suture directed slightly obliquely laterally. Lateral humeral stria shifted dorsad, visible in dorsal view at midlength of elytron. Sutural stria complete, rather broad. Metathoracic wing fully developed. Legs slender, long. Femur clavate. Tibial terminal spurs paired, margins serrate. Inner protibial spur longer and wider than outed, asymmetrical. Mesotibial spurs subequally long, metatibial spurs subequally long. Tarsus peculiarly elongate, as long as to longer than corresponding tibia. Basal pro- and mesotarsomere thickened, cylindrical. Pro- and mesotarsomeres 2–3 elongated. Penultimate tarsomere of all legs widened and flattened in dorso-ventral aspect, terminal tarsomere of all legs narrow, elongated. Basal metatarsomere distinctly longer than combined length of remaining tarsomeres. All claws strongly dentate at base. Procoxal rest subquadrate. Metaventrite broadly, strongly longitudinally impressed at place of metathoracic discrimen. Male tergite VII elongate, distinctly narrows posteriad, emarginate at posterior margin ( Fig. 57 ). Male morphological sternite VII peculiarly shaped ( Fig. 58 ), subtruncate at posterior margin, dorsally on posterolateral angles and covered with somewhat thickened, short setae and laterally here with longer, somewhat curved setae. Morphological sternite IX as in Fig. 59 . Tergite VIII and morphological sternite VIII as in Fig. 60 . Aedeagus ( Figs 62–62 ) long and slender, basale about twice as long as apical, with broad dorsal emargination at transition area to apicale; apicale with rather short, slightly curved and apically widened and broadly rounded paramere; median lobe tripartite, short and subtruncate medially and with two long, nearly acutely angulate lateral prongs.

Sexual dimorphism. Female ( Fig. 56 ) head either cylindrical, not or slightly widened at base, compound eye about 2.6–2.7× as long as longer tempus, antennomeres elongate cylindrical, without modifications, terminal antennomere almost twice as long as penultimate antennomere, pronotum distinctly wider than head across compound eyes. Female tergite VII broadly rounded at posterior margin ( Fig. 63 ). Female morphological sternite VII broadly subtriangular, rounded medially at posterior margin ( Fig. 64 ).

Differential diagnosis. Macratria longitarsis sp. nov. is unique among all congeners in the strongly elongate tarsi, the modified (flattened) antennomeres 4–8, in the combination with the large compound eyes in the male, the truncate, medially notched male head base, and the peculiar shape of the terminalia (the morphological sternite VII in particular) and the aedeagus.

Ecology. Collected from leaves of lower trees in shady places in primary lower montane rainforest.

Distribution. Star Mountains, Central Cordillera, New Guinea.

Figures

FIGURES 54–56. Macratria longitarsis sp. nov. 54—Holotype ♁, habitus, dorsal view; 55—Same, forebody and left antenna, dorsal view; 56—Paratype ♀, habitus, dorsal view [not to scale].

FIGURES 57–64. Macratria longitarsis sp. nov. 57—Paratype ♁, tergite VII, dorsal view; 58—Same, morphological sternite VII, ventral view; 59—Same, morphological sternite IX; 60—Same, morphological tergite VIII and morphological sternite VIII, ventral view; 61—Same, aedeagus; 62—Same, aedeagus, apical portion; 63—Paratype ♀, tergite VII, dorsal view; 64—Same, morphological sternite VII, ventral view [not to scale].