Calicnemia hamata, Phan, Quoc Toan, Kompier, Tom & Karube, Haruki, 2017

Phan, Quoc Toan, Kompier, Tom & Karube, Haruki, 2017, Description of two new Calicnemia from Vietnam and central Laos with notes on their congeners in Vietnam (Odonata: Platycnemididae), Zootaxa 4232 (3), pp. 409-420 : 412

Calicnemia hamata sp. nov.

( Figures 1 C; 3A–E)

Etymology. The specific name hamata is derived from Latin and means hooked in reference to the hook-shape at the tip of the flagella of the genital ligula.

Type material. Holotype: Male , Bokilhamsai , Kaew Neua Pass area, N.E. Lak Sao, Bolikhamxay Prov., C. Laos (700m), 29.IV.2002, Matti Hämäläinen leg.

Description of holotype male. Head ( Fig. 3 A). Labrum, genea and postclypeus matte black; anteclypeus dark reddish. Mandibles yellowish. Large transverse yellow stripe runs from edge of eyes over antefrons just above postclypeus and with very irregular dorsal edge. Antennae entirely black. Dorsum of head matte black with four orange spots just posterior of antennae. Two somewhat arrow–shaped larger ones at anterolateral edge of vertex and one between each antenna and edge of eyes. Posterior side of head matte black with two yellow teardropshaped spots. Thorax. Prothorax. Anterior and posterior lobes entirely black; middle lobes black with large yellow spot dorsally and small one laterally. Synthorax matte black with three conspicuous yellow stripes as in Fig. 1 C: Narrow antehumeral stripe, broader stripe over metepisternum through spiracle, and a third formed by yellow ventral half of metepimeron. Legs. Coxae black anterior and yellow posterior. Femora, tibiae, tarsi and claws entirely black. Wings hyaline; 17–18 postnodal crossveins in both wings. Pterostigma black, covering about 1.5 underlying cells. Abdomen ( Fig. 1 C): S1 black with large yellow lateral spot; S2–6 reddish, but posterior 1/6th of S6 black; S7–10 entirely black. Anal appendages ( Fig. 3 B–C) black. Cerci slanting upward and adorned with two long basal spines directed inward and ventrally. These spines difficult to see in lateral view. Paraprocts robust, shorter than length of cerci and slightly curved inward apically. Genital ligula as shown in Fig. 3 D–E: flagella short and robust, apically adorned with a hooked extension.

Measurement (mm). Abdomen including anal appendages 32; Hindwing 24.

Female. Unknown.

Diagnosis. It is probably justified to place Calicnemia hamata sp. nov. in group 1 based on the narrow lobe of its genital ligula, even if the flagella are shorter and more robust than usual for members of this group ( Fig. 3 D–E). The new species is easily separated from other species by the hook shape at the apex of the flagella ( Fig. 3 D–E). C. hamata sp. nov. comes closest to C. erythromelas of group 1 with respect to its body color pattern and the structure of its appendages ( Figs. 3 B–C & 4A–B).

A female specimen ( Fig. 1 D) collected from Xieng Khoang, Phonesavan Prov. in Laos and similar in pattern to both the male of C. hamata sp. nov. and the female of C. erythromelas could not be conclusively identified. Additional research is needed to clarify whether this is C. hamata sp. nov. or C. erythromelas .

Figures

FIGURE 1. Habitus of Calicnemia spp. (A, B), C. akahara sp. nov., male & female; (C), C. hamata sp. nov., holotype male; (D), Calicnemia sp., female (Xieng Khoang, Phonesavan Prov., Laos, 13 – 23. V. 2004, T. Mizusawa leg.).

FIGURE 3. Calicnemia hamata sp. nov. (A), head male; appendages in (B), lateral and (C), oblique-dorsal view; genital ligula in (D), dorsal and (E), lateral view.