Calleida luzonensis 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 : 105-108

[6] Calleida luzonensis Casale & Shi sp. n. Figs 36-42, Map 2

Type locality.

Philippines, Luzon, Nagtipunan (16.22N, 121.60E).

Type materials.

Holotype: male, "Philippines-E Luzon Nagtipunan, Quirino V-2014" (CCA, Figs 36, 37). Paratypes: 2 females, same data as holotype, but "July 2014" and "August 2014" (CCA, CRS). 1 female, "Filippine VIII.2014 Dindin, Isabela, eastern Luzon, racc. loc. leg." (CDG). 1 male, "Eastern Luzon, Sierra Madre, Madela, Tapsoy, Quirino", "June 2016" (BMNH). 1 male, "Filippine: VIII.2014 Sierra Madre, Tapsoy, Quirino, Eastern Luzon, Ismael leg." (CCA). 1 female, "Filippine: VIII.014 Nagtipunan, Quirino, Eastern Luzon, Ismael leg." (CDG). 1 male, "Filippine: Tapsoy, Quirino, Eastern Luzon VIII.2014 (local collectors)" (CDG). 2 females, "Philippine: Luzon, Quirino, Maddela, Disimongal, Sierra Madre. Mar. 2016, local collector" (IZAS).

Specific epithet.

The new species is named after its type locality: Luzon Island, Philippines.

Diagnosis.

C. luzonensis sp. n. is distinct amongst all Asiatic Calleida species but close to C. discoidalis for: (1) elytra with evident reddish patch on the inner three to five intervals, markedly contrasting with the lateral metallic green intervals; (2) head, antennae, pronotum, legs and underside uniformly yellow reddish; (3) terminal ventrite with two setae on each side in males, three or more setae in females. The new species is closest to C. discoidalis from Mindanao Island, both having very similar external features. Comparing with C. discoidalis , C. luzonensis sp. n. has the following differences: (1) elytral discal reddish patch usually more reduced, narrower and more prolonged; (2) elytra metallic region generally lighter and more vivid; (3) body size generally a little larger (L = 10.5-11.0mm). The following differences in the median lobe of aedeagus support these two species as distinct: (1) in C. luzonensis sp. n. the median lobe smaller in size, shorter and stouter, length about 1.9 mm; in C. discoidalis median lobe length about 2.6 mm; (2) in C. luzonensis sp. n. apical lamina wider and less developed, length 0.6 time as the basal width, apex not thickened in lateral aspect, versus in C. discoidalis , apical lamina longer and more developed, length 0.7 times the basal width, apex a little thickened in lateral aspect; (3) left margin markedly prominent near middle in dorsal aspect in C. luzonensis sp. n., and evenly curved in C. discoidalis .

As with C. discoidalis , C. luzonensis might be confused with C. splendidula , a sympatric species in the Luzon Island (Philippines) based on their similar habitus and colour, and the evident reddish patch on the elytral disc in both species. Moreover, in one female paratype from Dindin, Isabela (Fig. 39), the reddish patch on the elytral disc is extended from the base to apex only on the sutural interval, and extended on the second and third intervals only near the apex. Therefore, the elytra appear almost completely metallic green and particularly similar to those of C. splendidula “var.” unicolor Jedlička, which is widely distributed in Philippines.

The new species is, however, easily recognized from the latter by the larger size, the multisetose abdominal sternite VII (in the species belonging to C. splendidula group, abdominal sternite VII bears only one seta on each side in males, two in females), and for the different aedeagal shape.

Description.

General features as in Figs 36, 38, 39. Medium-sized species: TL = 10.0-10.5 mm; L = 10.5-11.0 mm.

Colour: Head, antennae, pronotum, underside and legs bright reddish yellow. Elytra bright metallic green, disc with an evident reddish patch, generally one-half to two-thirds as long as the elytra length, widest in apical third of elytra, occupying the inner three to five intervals; reddish patch not reaching elytral base, narrowed to apex, only with the first interval reddish at apex. In one examined specimen (Fig. 39), the reddish patch is rather reduced, extended only to the second and third intervals, thus the elytra are almost completely metallic green.

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

Head: Slightly convex, almost impunctate; supraorbital furrows shallow, vanished a little behind the anterior edge of eyes; temporae moderately swollen, gradually narrowed towards the neck; genae shorter than half the length of eyes; antennae reaching the basal fifth of elytra; terminal labial palpomere strongly securiform with truncate apex in males, also dilated much less so in females.

Pronotum: Wider than head, transverse-cordate (ratio PW/PL = 1.19-1.24), depressed on disc. Lateral margins widened and arcuate in front, reflexed and sinuate in the basal third; lateral expansions wide; basal foveae wide, very deep; posterior angles obtuse; disc with shallow transverse wrinkles.

Elytra: Moderately elongate (ratio EL/EW = 1.52-1.65), slightly widened in the posterior third, depressed; basal border complete, extended to the parascutellar stria; striae punctate; intervals subconvex at base, flattened on disc, sparsely punctate; the eighth intervals slightly tumid near apex; apical margin obliquely truncate, weakly concave, with margin slightly thickened at the outer apical angle, which is obtusely rounded.

Ventral side: Abdominal sternites with sparse and short pubescence. Abdominal sternite VII with two setae on each side in males, three to five setae on each side in females.

Male genitalia: As in Fig. 42, median lobe of aedeagus with general features as in C. discoidalis , but smaller in size, L = 1.9 mm, more widened and stouter; apical orifice pleuropic left; left margin prominent near middle in dorsal aspect; apical lamina less developed, rounded distally, length about three-fifths as long as the basal width in dorsal aspect; apex not thickened in lateral aspect. Endophallus with two chitinized, small sized, spine-like copulatory pieces, located in the middle area near the left lateral margin, close to each other at base. Left paramere depressed on the dorsal side; right paramere not curved at apex.

Female genitalia (reproductive tract Fig. 40 and gonocoxa Fig. 41): Spermatheca digitiform, about two times length of pedicel, surface faintly whorled, with a very small basal projection; spermathecal pedicel straight, apex markedly swollen; spermathecal gland duct laterally inserted on the basal projection, about same length as spermatheca; glandular area not incrassate, about half length as gland duct, base with small protuberant atrium. Gonocoxite II sub-rectangular, 2.5 times long as the basal width, a little narrowed to apex, apex wildly truncate, not oblique; setose from the middle to apex on both inner and outer margins; outer margin a little curved; apex with membranous extension.

Geographical distribution and habitat.

Only known from eastern Luzon Island (Quirino and Isabela provinces) in the Philippines (Map 2). Probably found in tropical forests by local collectors.