Leptocerina, Mosely, 1932

Forcellini, Maxence, 2021, A Revised Description of the Larva of Leptocerina pauliani (Ross 1957) (Trichoptera: Leptoceridae), an Endemic Species of La Réunion Island, Zootaxa 4981 (1), pp. 177-187 : 185

Key to the species of already-described Leptocerina larva

1 Case cylindrical in cross-section ( Hickin 1956, figs 8, 13)..................................................... 2

- Case triangular in cross-section ( Figs 1A, 1B )............................................................... 3

2 Case made up of vegetable debris arranged transversally; head coloration almost completely black (similar to Hickin 1948, fig. 1)............................................................................. Leptocerina ramosa trifida

- Case generally consisting of twig or hollowed stem; head coloration yellowish with dark longitudinal bands ( Hickin 1956, fig. 13)....................................................................................... L. ungandana

3 Triangular ventral apotome posteriorly elongate ( Fig. 3C )..................................................... 4

- Triangular ventral apotome wide and not posteriorly elongate ( de Moor 2002, fig. 5l; de Moor & Scott 2004, fig. 5.38A).............................................................................................. L. spinigera

4 Hind tarsi with rows of dense, long fringe of swimming setae and ventral row of short, stiff bristles ( Fig. 4C )............ 5

- Hind tarsi with short, stiff bristles but without long fringe of swimming setae ( Marlier 1956, fig. 2H)............ L. integra

5 Metanotum with well-defined sclerites on setal area 3 ( Hickin 1956, fig. 5).......................... L. ramosa pinheyi

- Metanotum with ill-defined sclerites on setal area 3 ( Figs 3D, 3E )....................................... L. pauliani

Figures

FIGURE 1. Sampling site for Leptocerina pauliani (Ross 1957) in a temporary reach of the River Marsouins, La Réunion Island. 1A, dry section; 1B, permanent pools.

FIGURE 3. Leptocerina pauliani (Ross 1957). 3A–3C, head: 3A, right lateral; 3B, dorsal; 3C, ventral. 3D–3F, thorax (legs removed to improve visibility): 3D, right lateral; 3E, dorsal, black arrows highlighting pair of long setae on each side of dorsal abdominal hump; 3F, ventral.

FIGURE 4. Leptocerina pauliani (Ross 1957). 4A–4C, left legs, anterior (inner) surfaces: 4A, foreleg (PI); 4B, midleg (PII); 4C, hind leg (PIII). 4D–4F, abdomen: 4D, abdominal segments I-III, right lateral (legs removed to improve visibility); 4E, right lateral hump, right lateral; 4F, metanotum, dorsal [black arrow indicating setal area 3 (SA3); inset = dorsal view of SA3].