Calleida cochinchinae Casale & Shi

Shi, Hongliang & Casale, Achille, 2018, Revision of the Oriental species of Calleida Latreille (sensu lato). Part 2: the C. discoidalis species group (Coleoptera, Carabidae, Lebiini), ZooKeys 806, pp. 87-120 : 98-99

[3] Calleida cochinchinae Casale & Shi sp. n. Figs 19-21, Map 2

Type locality.

S. Vietnam: “Cochinchina”.

Type material.

Holotype, female, "MUSEUM PARIS Cochinchine, Baudouin d’Aulne 1897", " Calleida cochinchine" (MNHN, Fig. 19).

Specific epithet.

The name is derived from the former name of the southern province of Vietnam of the former French empire (1862-1954), as indicated in the original label of the holotype.

Diagnosis.

This brilliant new species is distinct amongst all Asiatic Calleida species for: (1) abdominal sternite VII with five setae on each side in females (males unknown); (2) head, pronotum and ventral side uniformly metallic green, with marked cupreous reflection; (3) elytra rather elongate; (4) elytral apical margin strongly concave, with margins thickened at the outer apical angles but not angulate. C. cochinchinae can be easily distinguished from all other species in the C. discoidalis species group by its special coloration, but might be confused with C. viet Casale & Shi, also from South Vietnam, which has similar completely metallic greenish dorsal surface. Different from that species, the new species has a more elongate shape (EL/EW = 1.84, contrasting to 1.68 in C. viet ), less prominent elytral outer apical angles, and multisetose abdominal sternite VII (males unknown, but supposed multisetose also).

Description.

General features as in Fig. 19. Medium to large- sized: L = 12.0 mm (female holotype). Body elongate and slender, dorsal and ventral side completely metallic.

Colour: Head, pronotum, elytra (epipleura included), and ventral side uniformly metallic green with marked cupreous reflection, more evident at the elytral base and apex; clypeus and labrum blackish, palpomeres dark brownish with yellowish apex for the terminal segments; antennae and legs reddish yellow; legs with faint metallic green reflection; apex of femora, and all tarsomeres dark brownish.

Lustre and microsculpture: Dorsal surface rather shiny and polished; head and pronotum with vanished microsculpture; elytra with faint but distinct microsculpture in isodiametric meshes.

Head: Slightly convex, almost impunctate; frons with very faint transverse wrinkles at sides; supraorbital furrows moderately deep, vanished anteriorly to the half of the inner edge of eyes; temporae barely swollen, narrowed towards the neck; genae short, as long as the half length of eyes. Antennae short, only slightly exceeding the humeral angles of elytra. Terminal labial palpomere markedly dilated in females (probably securiform in males); mentum lateral lobes with outer margins straight, the inner margins oblique; mentum tooth obtusely truncate at apex, with two short setae inserted at the middle part of tooth.

Pronotum: Roundish-cordate (ratio PW/PL = 1.14), with its maximum width at about the anterior third; lateral expansions moderately wide; lateral margins reflexed and arcuate at the middle, distinctly sinuate before the posterior angles which are obtuse, not pointed at apex. Disc slightly convex, with deep transverse wrinkles and with a few punctures along the median furrow; median furrow deep, widened at base and reaching the posterior margin.

Elytra: Elongate (ratio EL/EW = 1.84), with basal ridge complete, extended to the parascutellar stria; striae deep, finely punctate; intervals flat, very finely and sparsely punctate; intervals 7-8 moderately tumid at apex; umbilicate series of 13 (right elytron) to 15 (left elytron) pores along the eighth stria; apical truncation oblique, markedly concave, margins thickened at outer apical angels, which are obtusely prominent, not angulate.

Ventral side: Glabrous; in the female holotype, abdominal sternite VII with five setae on each side, apical margin almost straight, slightly excised at middle. Male sternum unknown.

Male genitalia: Unknown.

Female genitalia (reproductive tract Fig. 21 and gonocoxa Fig. 20): Spermatheca slightly dilated to apex, a little longer than the pedicel, base without projection; surface distinctly whorled; spermathecal pedicel markedly dilated at the basal two thirds, slender in the apical third; spermathecal gland duct laterally inserted, rest portion not examined (damaged in the only available individual). Gonocoxite I wide; gonocoxite II subulate, elongate, a little narrowed to apex, about four times as long as wide at base; inner margin setose in the apical fourth; both outer and inner margins straight; apex obliquely truncate, with membranous setose extension.

Geographical distribution and habitat.

Only known from the single holotype female from Vietnam: “Cochinchina”, without further information on the type locality in the label (Fig. 19 and Map 2). No data are available on the habitat, which should be located in tropical forests of the region.

Remarks.

From the rather elongate habitus and peculiar female genital characters, C. cochinchinae sp. n. is different from all other known species in the C. discoidalis species group, but surprisingly accords with the C. lativittis species group. Amongst all examined species of Asiatic Calleida , only C. cochinchinae and species in the C. lativittis group (two species with female genitalia examined of three species of the group; Casale and Shi 2018) have the following character combinations of the female reproductive tract: spermatheca without basal projection or plate, and the spermathecal gland duct inserted on the lateral side of spermatheca. Thus, we inferred a relationship of the new species with the C. lativittis species group rather than to other species of the C. discoidalis group, which was erected as a "group of convenience" to accommodate species with similar multisetose abdominal sternite VII. This relationship was also supported by our phylogenetic analysis (Fig. 43).