Cymatodera humeralis Burke & Sole, 2017

Burke, Alan F., Sole, Catherine L., Toledo-Hernández, Víctor H. & Scholtz, Clarke H., 2017, Five new species of Cymatodera Gray, 1832 (Coleoptera: Cleridae: Tillinae) from Mexico and Central America, Zootaxa 4350 (1) : -

Cymatodera humeralis Burke & Sole , sp. n.

( Figs 1 , 6 , 22 , 27 )

Type material. Holotype: Red labeled, male: Mexico, Guanajuato, Sierra de Sta. Rosa, Cañada Guadalupe, 29-31- VIII-1995, 2 250m, I. Delgado ( CIUM) .

Paratypes: (1) Yellow labeled: 1 male: same data as holotype ( CNIN).

Differential diagnosis: Species of Cymatodera distributed in central Mexico belong to Cymatodera humeralis if they have the following combination of characters: Integument dark brown to almost piceous; a sinuous, pale, median elytral band; a pair of testaceous and irregular maculae on the humeral angles; anterior margin of elytral disc not constricted; posterior wings fully developed; and elytral punctuations arranged in regular striae, becoming small and shallow before apices. In addition, males of C. humeralis have the posterior margin of ventrites 1-4 with a longitudinal, pale carina ( Fig. 27 ), and the pygidium broad, small and subtriangular, with the posterior margin feebly and shallowly emarginate ( Fig. 6 ). Females of this new species are unknown.

Description: Holotype male. Form elongate, somewhat robust; metathoracic wings fully developed. TL = 8.85 mm. Color: Head, pronotum, thorax, abdomen and elytra piceous; antennae, legs and mouthparts testaceous; elytral surface with a pale testaceous, longitudinal, sinuate band that extends from the epipleural fold to the elytral suture, and a pair of pale, conspicuously marked maculae located on the humeral angles ( Fig. 1 ).

Head: HL = 1.85 mm, HW = 1.65 mm. Measured across eyes wider than pronotum; surface smooth, shiny, finely punctate; frons not bi-impressed, clothed with short, very fine, semirecumbent setae and few scattered long, erect setae; eyes large, subsinuate, ovoid, separated by approximately 1.95 eye-widths, bulging laterally. Antennae slender, extending slightly beyond anterior margin of elytra; third antennomere about twice the size of second antennomere, antennomeres 3-10 approximately the same size, eleventh antennomere ovoid, approximately 2 × the size of tenth antennomere; antennomeres 4-10 serrate; serration gradually increase distally.

Thorax: PL = 2.45 mm, PW = 1.5 mm. Pronotum elongate, widest at middle; sides constricted laterally, more strongly constricted behind middle; disc flat, moderately impressed in front of middle; subbasal tumescence feebly pronounced; surface shiny, feebly rugose, finely punctate; vested with short, pale, recumbent setae interspersed with few, long, erect setae, the latter more numerous laterally. Prosternum wider than long; surface shiny, smooth, shallowly punctate, glabrous. Mesoventrite shiny; shallowly punctate; vested with scattered, long, semierect setae. Metaventrite strongly convex; rugulose; shallowly punctate; clothed with fine, pale, semirecumbent setae.

Legs: Femora rugulose, finely punctate; clothed with short, pale, recumbent setae interspersed with a few erect setae. Tibiae longitudinally rugulose; feebly, shallowly and narrowly punctate; vested with short, recumbent setae interspersed with some scattered, erect setae.

Elytra: EL = 6.42 mm, EW = 2.95 mm. Anterior margin arcuately emarginate, wider than widest portion of pronotum; sides feebly oblique, widest on posterior 1/3; disc convex; apex rounded, not dehiscent; elytral sculpturing arranged in regular striae; punctuation on elytral disc scarce on anterior 1/2, then abruptly disappear on posterior 1/2; punctations at elytral base moderately coarse and deep; surface rugulose, shiny, clothed with short, pale, recumbent setae intermixed with scattered, long, erect setae.

Abdomen: Ventrites 1–5 subquadrate, rugulose, conspicuously, finely punctate; clothed with short, pale, recumbent setae. Ventrites 1-4 with a feebly elevated, longitudinal, pale carina which does not attain posterolateral angles and a pair of large, pale, shallow impressions near sides ( Fig. 27 ). Fifth ventrite feebly convex; subtriangular in shape; surface rugose, shallowly, finely punctate; lateral margins oblique, somewhat arcuate; posterior margin shallowly and broadly emarginate ( Fig. 6 ). Sixth ventrite subtriangular in shape; reduced; broader than long; lateral margins oblique, somewhat arcuate; hind margin conspicuously reduced, shallowly, U-shaped emarginate; surface feebly convex, shiny, finely punctate ( Fig. 6 ). Fifth tergite rugulose; lateral margins moderately oblique; posterior margin truncate. Sixth tergite reduced, subquadrate, broader than long; lateral margins oblique, feebly arcuate; posterior margin truncate, extending slightly beyond apical margin of sixth ventrite.

Aedeagus: AL = 1.25 mm. Somewhat sclerotized; ratio of length of paramere to whole tegmen 0.22: 1; tegmen does not cover phallus; parameres feebly developed, pointed at apex; phallobase rather narrow; phallus with copulatory piece acuminate distally; phallic plate without rows of denticles, finely granulate on lateral margins; phallobasic apodeme long, slender; endophallic struts robust apically, becoming slender distally ( Fig. 22 ).

Variation: The single paratype specimen has a length of 8.1 mm. Other characters remain constant.

Females: The female is unknown.

Distribution: The type material was collected at a single locality in the Sierra de Santa Rosa, at the northern portion of the state of Guanajuato ( Fig. 33 ). The vegetation at the collecting site is dominated by sub-temperate pine-oak forests mixed with other broad-leaved species.

Observations: The reduced and simple structure of the sixth visible abdominal segment, the serrate condition of antennomeres 4-10, and the longitudinal, pale carinae on the posterior portion of ventrites 1-4 ( Fig. 27 ), are characters that suggest relatedness of the new species to C. limatula Burke , C. gerstmeieri Burke and Bogcia disjuncta Barr.

Etymology: The specific epithet humeralis comes from the Latin “humerus”, meaning shoulder, a reference to the dark testaceous shoulders of this new species.

Figures

FIGURE 33. Map of A. Mexico and B. Central America showing the geographic position of collecting localities of: Cymatodera humeralis (black circle), Cymatodera lorenae (blues circles), Cymatodera crassa (red circles), Cymatodera depressa (orange circles), and Cymatodera nigrofasciata (green circles).

FIGURES 1 – 5. Habitus of: 1. Cymatodera humeralis n. sp. (holotype male), 2. Cymatodera lorenae, n. sp. (holotype male), 3. Cymatodera crassa, n. sp. (holotype male), 4. Cymatodera depressa, n. sp. (holotype male), 5. Cymatodera nigrofasciata, n. sp. (holotype male). Scale bars represent 1 mm.

FIGURES 6 – 17. Pygidia of: 6. Cymatodera humeralis (male, ventral view), 7. Cymatodera lorenae (male, ventral view), 8. Cymatodera lorenae (male, dorsal view), 9. Cymatodera crassa (male, ventral view), 10. Cymatodera crassa (male, dorsal view), 11. Cymatodera depressa (male, ventral view), 12. Cymatodera depressa (male, dorsal view), 13. Cymatodera nigrofasciata (male, ventral view), 14. Cymatodera nigrofasciata (male, dorsal view), 15. Cymatodera lorenae (female, ventral view), 16. Cymatodera lorenae (female, dorsal view), 17. Cymatodera humer (female, ventral view).

FIGURE 22 – 26. Male genitalia of: 22. Cymatodera humeralis, 23. Cymatodera lorenae, 24. Cymatodera crassa, 25. Cymatodera depressa, 26. Cymatodera nigrofasciata.

FIGURE 27 – 30. First and second ventrites of: 27. Cymatodera humeralis male, 28. Cymatodera lorenae male, 29. Cymatodera crassa male, 30. Cymatodera depressa male. Arrows indicate projected carinae.