Coptodera (Coptoderina) marginata Dupuis

Hunting, Wesley & Yang, Man-Miao, 2019, A taxonomic review of the pericaline ground-beetles in Taiwan, with descriptions of new species (Coleoptera, Carabidae, Lebiini), ZooKeys 816, pp. 1-164 : 67-71

Coptodera (Coptoderina) marginata Dupuis Figs 46b, 47, 48 A–C, 58A, 59

Coptodera formosana var. marginata Dupuis, 1912: 329.

Coptodera marginata Dupuis: Nakane and Ohkura 1956: 48; Habu 1967: 88; Lorenz 2005: 458.

Types and other material examined.

Paratype (female) labeled: "Hoozan/Formosa/H. Sauter II 10"; “Paratyp” [rectangular, red paper]; "DUPUIS DET."; " Coptodera / formosana / marginata /D". six specimens of C. marginata , five males and one female. For further details see EH Strickland Virtual Entomology Museum Database.

Type locality.

Taiwan (Formosa: Hoozan).

Diagnosis.

Specimens of this species are easily distinguished from other Taiwanese Coptodera by a combination of elytra with one seta in apical 1/4 of stria 3, one seta in apical 1/3 of stria 2, light lateral margins and an apical macula that does not extend to suture.

Description.

OBL 8.16 - 9.83 mm. Length (n = five males, one female): head 0.88 - 1.00, pronotum 1.16 - 1.44, elytra 5.16 - 6.16, metepisternum 1.20 - 1.32 mm; width: head 1.76 - 2.04, pronotum 2.24 - 2.68, elytra 3.66 - 4.66, metepisternum 0.68 - 0.84 mm.

Body proportions. HW/HL 1.91 - 2.14; PWM/PL 1.79 - 1.97; EL/EW 1.30 - 1.42; ML/MW 1.57 - 1.76.

Color. Fig. 47. Dorsum of head brunneous to rufo-piceous, area nearest to antennal socket brunneous to rufo-brunneous, clypeus, antennae, and palpi brunneous to rufo-brunneous; disc of pronotum brunneous to rufo-piceous, lateral margins testaceous to rufo-brunneous, always contrastingly lighter then disc; elytral disc, with four testaceous maculae, two anterior and two posterior, anterior macula large, from interval 3 to 7 in most specimens, closest to base of elytra in interval 5 and 6, closest to apex of elytra in interval 4, posterior macula, from interval 2 to 8, closest to base of elytra in intervals 4 and 5, closest to apex of elytra in interval 3 or 4; margins of elytra rufo-testaceous to brunneous; ventral surface with thoracic and abdominal tergites rufo-brunneous to rufo-piceous, proepipleuron and elytral epipleuron always contrastingly lighter, brunneo-testaceous to rufo-brunneous; legs with trochanter and femora and tarsi brunneous to rufo-brunneous, tibia rufo-brunneous to piceous on dorsal surface.

Microsculpture. Dorsum of head with microsculpture somewhat granulate and isodiametric on center of head and towards neck, outer portions less granulate to almost flat, easily visible at 50 ×; pronotum somewhat granulate, isodiametric to somewhat transverse mesh pattern easily visible at 50 ×; elytral intervals with transverse sculpticells, center of striae with isodiametric sculpticells a few cells wide; ventral surface of head with microsculpture transverse, faintly visible at 50 ×; prosternum, proepipleu ron, mesepisternum and metepisternum with sculpticells forming a shallow, somewhat transverse to transverse mesh.

Macrosculpture and pilosity. Dorsum of head and clypeus faintly rugulose, with relatively dense, fine, scattered setigerous punctures, setae hardly visible at 50 ×; pronotum with relatively dense, fine and scattered setigerous punctures, visible in side view at 50 ×, disc shallowly rugulose; elytra with intervals broadly rounded, single row of fine setigerous punctures in the center of each interval, these punctures larger than additional scattered setigerous puncture throughout disc, striae with single row of fine setigerous punctures hardly visible in lateral view at 50 ×; ventrally, thoracic and abdominal sclerites with scattered setigerous punctures throughout.

Fixed setae. Elytra with two setae in apical 1/3 of stria 2, one seta near base in stria 3.

Luster. Dorsal and ventral surfaces moderately glossy.

Head. Mandibles somewhat curved at apex, somewhat long and narrow in form, when measured on outside diameter, visible portion always shorter than length of labrum; labrum slightly wider than clypeus at max width, broadly bilobed.

Pronotum. Anterior transverse impression deep; posterior transverse impression deep, median longitudinal impression moderately deep; lateral margins explanate, apico-lateral margins broadly rounded, posterio-lateral margins obtuse.

Elytra. Apex slightly sinuate.

Legs. Two rows of small squamo-setae on tarsomeres 1-2 of mid-leg; males with two notches apically on ventral side of mid-tibia.

Male genitalia. Figs 46B, 48 A–C. Length 1.54 - 1.64 mm. Ostium catopic, opening positioned slightly left of center. Phallus cylindrical, right side straight along length, left side curving from mid-length to apex when viewed ventrally, apical area with short, bluntly rounded apex; endophallus long and narrow, with constriction near base, two distinctive microtrichial fields, one large one towards apical end, one smaller and more dense one (esp) between basal constriction and larger microtrichial field, sclerotized ring of spines at narrowest portion of apical constriction.

Female genitalia. Fig. 58A. Width 1.38 mm. The single female specimen dissected was in very poor condition and all other accessory organs were destroyed in prep.

Habitat, habits, and seasonal occurrence.

The known elevational range of C. marginata is from 1000 to 1200 meters. Adults of this species are found in mixed forest of montane areas. Little is known of the habits of this species. Specimens have been collected from April to September in Taiwan and methods of collecting include malaise trap and hand collecting.

Geographical distribution.

Coptodera marginata is known from Japan and Taiwan. For Taiwan collecting localities see Figure 60.