Coeliccia flavostriata Laidlaw, 1918

Albert G. Orr & RorY A. Dow, 2016, Description of larvae of two species of Coeliccia Selys, 1865 from Sarawak, identified using DNA barcoding (Odonata: Platycnemididae), Odonatologica 45 (1), pp. 117-132 : 121-124

Coeliccia flavostriata Laidlaw, 1918

( Figs 2 ; 3a, b; 4a)

Material studied. One F larva, ♂ ( RMNH.INS.509691), stream on Gunung Serapi, just outside of Kubah National Park, Kuching Division, Sarawak, Borneo, 1.58943N, 110.19487E. 01-vii-2013, ca 650 m a.s.l., leg. R.A. Dow, in RMNH.

Description. In general appearance a small, moderately long-legged zygopteran of light build and typical coenagrionoid appearance ( Fig. 2 ). Post-ocular lobes of head smoothly rounded. Caudal lamellae paddle shaped, with distinct petiole, the central lamella being considerably longer than the laterals ( Fig. 4 ). Coloration overall neutral brown, with darker brown banding on legs and deeper purplish mottling on the caudal lamellae. Body surface relatively smooth, bearing only sparse, very fine setae.

Head in dorsal view ( Fig. 2 ), forming roughly a squashed pentagon in outline, with well rounded occipital lobes and a deep rounded excavation posteriorly. Labrum produced and rounded. In dorsal view labial palps and anterior corners of prementum clearly visible projecting beyond labrum and face. Occipital triangle only slightly raised. Antennae long, seven-segmented, final segment very short; segments 2–6 slightly darkened except at base and apex, but not so strongly as to produce a clear pattern. Compound eyes moderately large. Mandibles not evident in dorsal view. Articu- lation of mask almost reaching posterior margin of mesocoxae when retracted. Prementum ( Fig. 3a ) flat ventrally, only slightly concave dorsally, with three pairs of long, strong setae seated post medially; in outline broad distally and tapered to a narrow base about one quarter its maximum distal breadth; median lobe (ligula) strongly produced with the two slightly convex sides forming an angle of about 100°; median cleft absent; lateral margins bearing short strong setae in distal half, bare in basal half. Labial palp long, terminating in a strong ventral curved hook and a dorsal, straight, slightly serrate securiform edge ( Fig. 3 c), the two separated by a deep cleft; four long, strong, inwardly directed palpal setae and a rather short movable hook, seated well back from its apex. Mandibles: right mandible incisor with four long, well defined teeth and shorter basal one ventrally; molar field unarmed except for small basal prominence; left incisor similar but left molar field with short, prominent, blunt tooth. Legs, moderately long; femora and tibiae with distinct dark marking and bearing only very fine sparse setae. Wing pads reaching just beyond hind-margin of S4; unmarked. Abdomen unmarked, smooth, gradually tapered posteriorly. Caudal lamellae clearly dorso-ventrally flattened (arranged vertically), foliate and rounded apically with extensive dark basal marking, mottled around the periphery; median lamella slightly more than half length of abdomen; lateral lamellae ( Fig. 4 b) ca 9 /₁₀ length of median lamella; petiole with outer lateral, as well as dorsal and ventral spines. Cerci small and bud-like. Male gonapophyses well developed; extending a little beyond posterior margin of S9.

Species RMNH. Country Location BOLD Process Coeliccia campioni 503463 Malaysia Hose Mountains, Kapit division, Sarawak COBOR001-15 Coeliccia campioni 506252 Malaysia Bukit Kana, Bintulu division, Sarawak COBOR002-15 Coeliccia campioni 500010 Malaysia Mount Dulit, Miri division, Sarawak COBOR003-15 Coeliccia campioni 500029 Malaysia Gunung Mulu National Park, Miri division COBOR004-15 Coeliccia flavostriata 501225 Malaysia Gunung Serapi, Kuching division, Sarawak ODOPH251-13 Coeliccia flavostriata 509691 Malaysia Gunung Serapi, Kuching division, Sarawak COBOR005-15 Coeliccia flavostriata 501222 Malaysia Kubah National Park, Kuching division, Sarawak COBOR006-15 Coeliccia flavostriata 501218 Malaysia Kubah National Park, Kuching division, Sarawak COBOR007-15 Coeliccia flavostriata 501224 Malaysia Kubah National Park, Kuching division, Sarawak COBOR008-15 Coeliccia kenyah 503460 Malaysia Mount Dulit, Miri division, Sarawak COBOR009-15 Coeliccia kenyah 503457 Malaysia Gunung Kalulong, Miri division, Sarawak COBOR010-15 Coeliccia borneensis 503469 Malaysia Mount Dulit, Miri division, Sarawak ODOPH246-13 Coeliccia didyama 503926 Malaysia Sekayu Recreational Forest, Terengganu ODOPH249-13 Lestes dissimulans 500228 Ghana ODOPH201-13

INS. ID

Measurements [mm]: Total length (without caudal lamellae) 12.45; maximum width of head 3.68; hind femur 3.70; cercus 0.15; right lamella 4.13; median lamella 3.68.

Remark. The larva was found in a small pack of leaf litter between rocks in the stream bed; adult C. flavostriata were moderately abundant at the same site.

Figures

Figure 2. Coeliccia  flavostriata, larva habitus, also showing form of head, in dorsal view. Drawing by AGO

Figure 4. Lateral view of caudal lamellae (right above, median below): a − Coeliccia flavostriata; b − C. campioni. Drawing by AGO

Figure 3. a, b − Coeliccia  flavostriata: a − overview of mask; b − lateral detail of labial palp (setae not removed); c, d − C. campioni: c − overview of mask; d − dorsal view of head. Drawing by AGO