Macratria spatulatocalcarata, 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 : 39-42

Macratria spatulatocalcarata sp. nov.

urn:lsid:zoobank.org:act:7E578E1E-6B17-4348-8FB1-A82138715EE3

( Figs 101–115 )

Type material designated. Holotype ♂ NME: INDONESIA E, New Guinea , Papua Prov., between Sentani and Waena, 02°34’44’’S 140°34’09’’E, 90 m, 30.III.1998, river valley, from riverside vegetation, leg. L.Wagner [printed].

Paratypes 11 specimens. 4♀ NME , 1♂ & 2♀ DTC: same label as holotype; 2♂ NME & 1♂ DTC: INDONESIA E, New Guinea, Papua Prov., Bonggo 16 km NW, 02°13’02’’S 139°27’35’’E, 32 m, 28.III.1998, stream valley, from streamside vegetation, shady place [printed] ; 1♀ NME : INDONESIA E, New Guinea, Papua Prov., Sentani , between the airport and the lake, 02°35’14’’S 140°32’01’’E, 80 m, 30.III.1998, sago swamp, from Metroxylon leaves [printed] .

Derivatio nominis. From the combination of Latin “spatulatus” (spatulate; a broad, flat, blunt blade)+ “calcarata” (having a spur) to point on peculiarly shaped inner metatibial terminal spur in males of the new species.

Measurements, holotype male, total body length about 4 mm; head length 0.85 mm, head width across compound eyes 0.7 mm, pronotal length 1 mm, maximum pronotal width 0.7 mm, elytral length 2.2 mm, combined maximum elytral width 0.9 mm. Selected male paratypes 4.1–4.5 mm, selected female paratypes 4.2–4.4 mm long.

Description. Male ( Figs 101–104 ). Dorsum and venter nearly uniformly black. Mouthparts including maxillary palpi yellow and antennomeres 1–8 yellow, remaining antennomeres yellowish brown. Prothoracic leg yellow, tibia shortly brown at contact point with femur, procoxa brown. Mesothoracic femur yellow, tibia yellowish brown to brown, tarsus yellowish brown, mesocoxa black-brown. Metathoracic leg black to black-brown, femur yellowish brown in basal part. Head moderately glossy dorsally and ventrally, elliptical, distinctly narrows towards base. Frons narrow, about half to slightly more as wide as dorsal eye length. Compound eye large, occupying most of lateral side of head beyond antennal insertion, moderately protruding from lateral outline of head. Interfacetal setae long, dense. Tempus strongly constricted, rounded in one narrow arch with head base. Frontoclypeal suture or impression not observed. Head dorsal punctures variably large but generally small and shallow, denser on frons compared to vertex. Intervening spaces smooth, as wide as to 3× as wide as punctures. Head dorsal setae white, appressed to subdecumbent, rather dense, directed in part transversely, in part longitudinally. Tactile setae sparse, erect, not longer than ordinary setae.Antenna slender and strongly filiform, hardly extending towards mesocoxal cavity when directed posteriad.Basal antennomere elongate, twice as long as antennomere two. Antennomere three about 1.5× as long as antennomere two, about 0.7× as long as antennomere four. Antennomeres 3–11 long and slender, penultimate antennomere somewhat widened distally. Terminal antennomere long and slender, acutely pointed, about twice to 2.2× as long as penultimate antennomere. Terminal maxillary palpomere supercultriform (internal edge arched, external edge straight). Pronotum moderately glossy dorsally and on prothoracic hypomeron, slightly convex in dorsal aspect, elongate cylindrical, distinctly narrower than head across compound eyes. Anterior margin narrow, subtruncate. Lateral margins slightly constricted laterally anteriad and towards base. Dorsal pronotal punctures somewhat larger and denser than those on head, moderately deep. Intervening spaces smooth to transversely microstrigose, generally as wide as punctures. Pronotal dorsal setation whitish to dirty yellowish, appressed to subdecumbent, long on median part of pronotum, short to very short on lateral margins, not fully concealing dorsal sculpture of pronotum. Tactile setae sparse, erect, not longer than ordinary setae. Scutellar shield small, truncate at posterior margin. Elytron elongate, moderately glossy, slightly and gradually narrows posteriad. Humerus broadly rounded. Postbasal transverse impression not indicated. Punctures on each elytron in anterior half arranged into five complete, flat, irregularly shaped rows; punctures subconfluent in corresponding rows. Intervening spaces between rows minutely punctate and microstrigose. Elytral setation dirty yellowish, dense, long, directed posteriad, effectively concealing dorsal sculpture of elytron. Those setae adjacent to suture directed slightly obliquely laterally. An irregular, not strongly defined lateral spot of white setae on anterior third of elytron, not touching suture. Tactile setae sparse, erect, not longer than ordinary setae. Lateral humeral stria shifted dorsad, visible in dorsal view at midlength of elytron. Sutural stria complete, rather broad. Metathoracic wing fully developed. Legs rather stout. Tibia widened in distal half. Male metatibia somewhat flattened at inner margin in distal half, nearly glabrous; both sides of this glabrous area with series of long, straight to slightly sinuous whitish setae ( Fig. 104 ). Tibial terminal spurs paired, at least metatibial outer spur serrate. Male inner metatibial terminal spur peculiarly broad, spatula-like, subtruncate apically ( Figs 103–104 ). Basal metatarsomere distinctly longer than combined length of remaining tarsomeres. All claws strongly dentate at base. Metaventrite deeply, narrowly longitudinally impressed at place of metathoracic discrimen. Male tergite VII narrowing posteriad, shortly subtruncate at posterior margin ( Fig. 106 ). Male morphological sternite VII ( Figs 107–109 ) short and broad, with paired, long lateral prong which is bilobate (provided with shorter, rounded subapical lobe at external margin), densely setose along external margin in apical half; posterior margin medially with a large subtriangular protrusion at posterior margin, provided with two extraordinary long setae. Aedeagus ( Fig. 111–113 ) long, basale about three times as long as apicale. Paramere moderately long, slender, apically acutely angulate. Median lobe slender, apically tripartite, median part apically rounded and longer than lateral prongs.

Sexual dimorphism. Female ( Fig. 105 ) pronotum more regularly cylindrical, slightly narrowing anteriad, terminal antennomere nearly twice as long as penultimate antennomere, metatibia without modifications. Female tergite VII broadly rounded at posterior margin ( Fig. 114 ), morphological sternite VII broadly triangular, narrowly rounded medially at posterior margin ( Fig. 115 ).

Differential diagnosis. Macratria spatulatocalcarata sp. nov. belongs to the gestroi species-group and is unique among all congeners primarily in the peculiar shape of the male inner metatibial terminal spur in the combination with the unique shape of the terminalia.

Ecology. Collected from leaves of lower trees in a shady place near a stream in degraded lower montane rainforest.

Distribution. Northern lowlands, New Guinea.

Figures

FIGURES 101–105. Macratria spatulatocalcarata sp. nov. 101—Holotype ♁, habitus, dorsal view; 102—Paratype ♁, forebody and left antenna, antero-dorsal view; 103—Same, outer terminal spur of left metatibia, dorsal view; 104—Paratype ♁ (different specimen), distal portion of left metatibia, lateral view; 105—Paratype ♀, habitus, dorsal view [not to scale].

FIGURES106–115.Macratriaspatulatocalcaratasp.nov.106—Paratype♁,tergiteVII,dorsalview;107—Same,morphological sternite VII, ventral view; 108—Same, morphological sternite VII, median part of posterior margin, ventral view; 109—Same, morphological sternite VII, apical portions of lateral prongs; 110—Same, morphological tergite VIII, morphological sternites VIII and IX, ventral view; 111—Same, aedeagus; 112–113—Same, aedeagus, apical portion with different grade of retraction of tegmen; 114—Paratype ♀, tergite VII, dorsal view; 115—Same, morphological sternite VII, ventral view [not to scale].