Macratria guaymi, Telnov, 2023

Telnov, Dmitry, 2023, New species and records of Macratriinae LeConte, 1862 (Coleoptera: Anthicidae) from the Americas with five new descriptions, Zootaxa 5389 (2), pp. 173-192 : 184-185

Macratria guaymi sp. nov. ( Figures 8–10 )

https://zoobank.org/ C932C8DF-4035-4609-923F-8D339DFF1473

Type material designated. Holotype ♂, BMNH: PANAMA Bocas del Toro prov. Chiriqui Grande 19.ix.2007 08°56’32’’N, 082°09’20’’W, 30m, vegetation along road beating & sweeping L. SEKERKA & D. WINDSOR lgt. [printed, label green, black frame] // BMNH{E} 2010-28 Lukáš Sekerka [printed]. The antennomeres 2–11 of the left antenna, the right mesothoracic tarsus and metathoracic tarsomeres 2–4 are missing.

Paratype 1♀, BMNH: same labels as holotype .

Derivatio nominis. Named after the Guaymí people, an Amerindian ethnic group of Chiriqui Province of Panama, where the new species occurs. Noun in apposition.

Measurements, holotype male, total body length 4.55 mm; head length 0.9 mm, head width across compound eyes 0.7 mm, pronotal length 1.2 mm, maximum pronotal width 0.75 mm, elytral length 2.55 mm, combined maximum elytral width 1 mm. Female paratype 4.7 mm long.

Description. Male ( Fig. 8A–B ). Dorsum and venter nearly uniformly black, mouthparts, clypeus and anterior frons striking pale yellow and terminal abdominal ventrite brown. Five basal antennomeres yellow, remaining antennomeres brown. Maxillary palpi yellow. Femora largely yellow, narrowly black at base. Pro- and mesothoracic tibia brown in basal, yellow in apical part, metathoracic tibia entirely black. Tarsomeres yellow, basal tarsomere of each leg darkened. Head opaque dorsally, moderately glossy ventrally, elliptical, prolonged anteriorly. Frons wide, about 0.8× as wide as dorsal eye length. Compound eye large, strongly protruding from lateral outline of head, about 2.75× as long as moderately constricted tempus. Interfacetal setae long, dense. Head base subtruncate, medially slightly notched. Frontoclypeal suture or impression not observed. Head dorsal punctures dense, moderately deep. Intervening spaces smooth, narrower than punctures. Head dorsal setae whitish, subdecumbent, dense, effectively concealing dorsal surface of head. Tactile setae sparse, erect, long. Antenna slender and strongly filiform, thickened at apex, extending towards base of pronotum when directed posteriorly. Basal antennomere cylindrical, slightly longer than antennomere two. Antennomere three about 1.2× as long as antennomere two, about same long as each antennomeres four to six, 0.8× as long as antennomere seven. Antennomeres 2–8 slightly elongate, about same long. Antennomeres 9–10 enlarged, widened distally. Terminal antennomere elongate fusiform, pointed, about 1.8× as long as penultimate antennomere, almost as long as combined length of antennomeres 9–10. Terminal maxillary palpomere subcultriform. Pronotum subopaque dorsally, flattened in dorsal aspect, elongate elliptical, about as wide as head across compound eyes. Anterior margin truncate. Lateral margins constricted anteriorly, broadly rounded medially. Dorsal pronotal punctures much larger and denser than those on head, deep. Intervening spaces strongly narrower than punctures. Pronotal dorsal setation pale yellowish, dense, decumbent, effectively concealing dorsal sculpture of pronotum. Basal area of pronotum without zone of dense setae. Tactile setae sparse, erect, not longer than ordinary setae. Scutellar shield small, transverse, truncate at posterior margin, sparsely punctate, subopaque. Elytron elongate, opaque, narrows posteriorly. Humerus broadly rounded. Postbasal transverse impression not indicated. Punctures on each elytron arranged into seven poorly defined, flat rows. Intervening spaces between rows minutely punctate to microstrigose. Elytral setation dirty yellowish, decumbent, long and dense, directed posteriorly and, in part, obliquely laterally, effectively concealing dorsal sculpture of elytron. Those setae in rows of punctures longer and thinner, directed strongly posteriorly. Tactile setae not observed. Lateral humeral stria not shifted dorsad, not visible in dorsal view. Sutural stria complete, rather narrow. Metathoracic wing fully developed. Legs long and stout. Femur clavate. Tibia distinctly widened distally, densely setose, metathoracic tibia slightly arched. Tibial terminal spurs paired, margins serrate; spurs of metathoracic tibia slightly longer than those of mesothoracic tibia. Tarsomeres of all legs elongate, terminal tarsomere of all legs conspicuously small. Basal prothoracic tarsomere widened. Basal metathoracic tarsomere shorter than combined length of remaining metathoracic tarsomeres. All pretarsal claws strongly dentate at base. Male tergite VII elongate, subtruncate to broadly emarginate at posterior margin ( Fig. 9A ). Male morphological sternite VII rather short and broad, at posterior margin sinuous and with a row of long setae ( Fig. 9B ). Male tergite VIII broad, with long, narrow lateral arms, morphological sternite VIII cleft till its base ( Fig. 9C ), sternite IX V-shaped with long arms ( Fig. 9D ). Aedeagus ( Fig. 9E–F ) long and rather slender, basale nearly 3× as long as apicale. Paramere curved inwardly, Г-shaped, apically subtruncate, laterally with long setae. Median lobe apically bipartite.

Sexual dimorphism. Female ( Figs 8C–D , 10 ) somewhat stouter, frons about as wide as dorsal eye length, antennomeres 3–8 short, less elongate than those of male, antennomeres 9–10 enlarged and widened, terminal antennomere twice as long as penultimate, as long as combined length of antennomeres 9–10, elytron less elongate, comparatively wider than that of male, stronger rounded laterally around midlength and less strongly narrowed posteriorly, metathoracic tibia not or hardly arched, prothoracic tarsomeres stronger widened and flattened than those of male, terminal tarsomeres of ‘normal’ length and pretarsal claws larger than those of male. Female tergite VII somewhat tripartite at posterior margin ( Fig. 10A ). Female morphological sternite VII broadly rounded to obtusely tapered at posterior margin ( Fig. 10B ). Female tergite VIII and morphological sternite IX as in Fig. 10C .

Differential diagnosis. Macratria guaymi sp. nov. shares several features with M. bugle sp. nov. ( Panama; described in the present paper). The head posterior to the compound eyes is less strongly constricted, the pro- and mesothoracic femur is nearly entirely pale yellow, the head and pronotum stronger and denser punctured in M. guaymi sp. nov., and the male terminalia and aedeagus are distinctly different from those in M. bugle sp. nov.

Ecology. Virtually unknown. Collected from roadside vegetation.

Distribution. Panama: Chiriqui Province.

Figures

FIGURE 8. Macratria guaymi sp. nov.A—Holotype ♂, habitus, dorsal view; B—Ditto, forebody, dorsal view; C—Paratype ♀, habitus, dorsal view; D—Ditto, forebody, dorsal view [not to scale].

FIGURE 9. Macratria guaymi sp. nov., holotype ♂. A—Tergite VII, dorsal view; B—Morphological sternite VII, ventral view; C—Tergite VIII and morphological sternite VIII, ventral view; D—Morphological sternite IX; E—Aedeagus; F—Aedeagus, apicale, enlarged [not to scale].

FIGURE 10. Macratria guaymi sp. nov., paratype ♀. A—Tergite VII, dorsal view; B—Morphological sternite VII, ventral view; C—Tergite VIII and morphological sternites VIII and IX, dorsal view [not to scale].