Gonioctena (Spartoxena), Motschulsky, 1860

Baselga, Andres, 2010, The mature larva of Gonioctena variabilis (Olivier, 1790) Coleoptera, Chrysomelidae, Chrysomelinae) and key to the larvae of the subgenus Spartoxena, ZooKeys 33 (33), pp. 19-27 : 26

Key to known larvae of the subgenus Spartoxena

1. Abdominal segments 1–6 with four dorsal and three dorsolateral tubercles on each side ( Steinhausen 1994: Fig. 216). Southern Alps ...... G. gobanzi (Reitter)

– Abdominal segments 1–6 with four dorsal and two dorsolateral tubercles on each side (Fig. 10)...................................................................................... 2

2. Tarsal claws with a weak tooth on ventral side (Figs 3, 5). Labrum with a wide V-shaped notch (Figs 2, 4) ......................................................................... 3

– Tarsal claws with a marked tooth on ventral side (Figs 7, 9). Labrum with a wide U-shaped notch (Figs 6, 8) ................................................................ 4

3. PS tubercle in abdominal segment 1 extremely reduced to an isolated seta ( Baselga and Novoa 2004: Fig. 11). Tarsal claws weak but well delineated (Fig. 5). Microtrichia of epipharynx mostly isolated or sometimes paired (Fig. 4). Western and southern Iberian peninsula and northern Morocco..... ................................................................................. G. aegrota (Fabricius)

– PS tubercle in abdominal segment 1 slightly reduced but always well visible and bearing 2 setae (Fig. 10). Tarsal claws almost completely effaced (Fig. 3). Microtrichia of epipharynx isolated through lateral margins but fused together to form groups of 2–3 denticles near central notch (Fig. 2). Eastern and northern Iberian peninsula and southern France................. G. variabilis (Olivier)

4. Tarsal claws with a broad tooth (Fig. 9). Labrum with a deep U-shaped notch (Fig. 8). Microtrichia of epipharynx isolated through lateral margins but fused together to form ridges of 3–5 denticles near the central notch (Fig. 8). Northwest quarter of the Iberian peninsula...................... G. leprieuri (Pic)

– Tarsal claws with an acute tooth (Fig. 7). Labrum with a shallow U-shaped notch (Fig. 6). Microtrichia of epipharynx mostly isolated or sometimes paired (Fig. 6). South-east Iberian peninsula ............. G. pseudogobanzi Kippenberg