Coeliccia campioni 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: 124-127

publication ID 10.5281/zenodo.50854

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Coeliccia campioni Laidlaw , 1918


Coeliccia campioni Laidlaw, 1918 

( Figs 3View Figure 3. a, b c, d; 4 b)

Material studied. One F- 2? larva, ♀ ( RMNHAbout RMNH.INS. 500029), “Camp 2 ” stream, lower slopes of Gunung Mulu, Gunung Mulu National Park, Miri Division, Sarawak, Borneo, 4.04751 N 114.86622 E. 12 -ix- 2008, ca 500 m a.s.l., leg R.A. Dow, in RMNHAbout RMNH.

Description. In general appearance a small, moderately long-legged zygopteran of light build and typical coenagrionoid appearance, a little more squat with proportionally longer legs than the larva of C. flavostriata  ( Fig. 2View Figure 2). Marked as C. flavostriata  . Otherwise very similar to that species except in points noted below.

Head ( Fig. 3View Figure 3. a, b d) rather robustly built, in dorsal profile relatively long, with rounded occipital lobes widely separated. Labrum rounded. Mandibles not visible in dorsal view but labial palps and anterior corners of prementum protruding well beyond labrum and face so as to be visible in dorsal view. Ocellar triangle prominently raised, but not excessively so. Antennae long, seven-segmented, final segment very short; segments 2–6 very slightly darkened except at base and apex, without any clear pattern. Articulation of mask reaching almost to hind margin of mesocoxae when retract- ed. Prementum with three pairs of long, strong setae seated post medially. In outline ( Fig. 3View Figure 3. a, b c) broad distally and tapered to a narrow base a little less than one third its maximum distal breadth; median lobe (ligula) strongly produced to form an obtuse angle, the two slightly convex sides forming an angle of about 125 °; median cleft absent; lateral margins of prementum bearing short stout setae in distal half, bare in basal half; Labial palp long, bearing just three long, strong, inwardly directed setae. 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. Abdomen tapered smoothly and gradually; outer wing pads reaching a little beyond hind margin of S 2, inner wing pads terminating well before hind margin S 2. Caudal lamellae ( Fig. 4View Figure 4 b) dorsoventrally flattened (arranged vertically); strongly petiolated with posterior lamina foliate with acuminate tip; basal half of lamina strongly pigmented dark brown; median lamella ca 7 / ₁ ₀ length of abdomen; lateral lamellae, ca 4 / ₅ length of median lamella and with much more developed terminal filament; petiole fringed with fine setae, lacking spines. Cerci small and bud-like. Female gonapophyses well developed; outer pair extending about halfway to posterior margin of S 10; inner pair distinctly shorter.

Measurements (mm): Total length (without caudal lamellae) 7.20; maximum width of head 2.10; hind femur 2.85; cercus 0.10; right lamella 3.00; median lamella 3.50.

Remarks. Because the specimen is not a final instar some characters may not correspond to the condition found in the F larvae. These include in particular the development of the gonapophyses as well as the overall stature of the larva, which is slightly squatter than the F stadium of C. flavostriata  . It seems probable the heavier build of the head, and the different shape of the mask, would also occur in the mature larva of C. campioni  as would the strikingly differently shaped caudal lamellae. It is unclear if the smaller number of palpal setae would also be present in the F stadium larva.

The larva was found in a small pack of leaf litter in the bed of a small, high gradient stream. Adult C. campioni  have been found at the same location as the larva.

Differential diagnosis. In C. campioni  the head ( Fig. 3View Figure 3. a, b d) is more robustly built than in C.flavostriata  , in dorsal profile distinctly longer, with rounded occipital lobes more widely separated, making the whole head wider posteriorly and overall more robust. Ocellar triangle more prominently raised in C. campioni  than C. flavostriata  . Prementum broader basally and ligula less produced in C. campioni  than in C. flavostriata  . Caudal lamellae strongly acuminate in C. campioni  , spatulate in C. flavostriata  .


National Museum of Natural History, Naturalis