Polycentropodidae, Ulmer, 1903

Karaouzas, Ioannis & Waringer, Johann, 2017, The larva of Polycentropus ierapetra Malicky 1972 (Trichoptera: Polycentropodidae), including a key to the larvae of genus Polycentropus (Curtis 1835) in the Hellenic western Balkan region, Zootaxa 4294 (5), pp. 586-592 : 587

Key to final instar larvae of Polycentropodidae genera and Polycentropus species in the Hellenic western Balkan region (= European Ecoregion 6).

1 Basal segment of anal proleg without bristles ( Fig. 8 a); pair of short spines present on abdominal sternum IX ( Fig. 8 b)............................................ Neureclipsis McLachlan 1864 (only Neureclipsis bimaculata (Linnaeus 1758))

- Basal segment of anal proleg with numerous bristles; short spines lacking ( Fig. 4 )..................................2

2 Inner apex of anal claw with four blunt teeth ( Fig. 9 c)...... Cyrnus Stephens 1836 (only Cyrnus trimaculatus (Curtis 1834))

- Inner apex of anal claw smooth ( Fig. 4 )....................................................................3

3 Ratio of protarsal length / protibial length <0.50............................................................ 4

- Ratio of protarsal length / protibial length>0.70 ( Fig. 2 ); anal claw obtuse-angled ( Fig. 4 )...........................5

4 Anal claw obtuse-angled (as in Fig. 4 ); distance between median border of spot ‘m’ and frontoclypeal suture greater than length of this spot ( Fig. 5 ).................................................. Polycentropus excisus Klapálek 1894

- Anal claw right-angled ( Fig. 7 ); distance between median border of spot ‘m’ and frontoclypeal suture equal to length of this spot ( Fig. 6 )........................................................ Polycentropus flavomaculatus ( Pictet 1834)

5 Head width <1.65 mm ................................................... Polycentropus ierapetra Malicky 1972

- Head width> 1.65 mm ........................................................... Plectrocnemia Stephens 1836 (The larvae of only three species within European Ecoregion 6 are known: P. brevis McLachlan 1871 , P. conspersa ( Curtis 1834) , and P. geniculata McLachlan 1871 ; these species can be identified using the keys of Edington & Hildrew 1995 and Waringer & Graf 2011).

Figures

FIGURES 8 – 9. Polycentropodidae genn. spp., 5 th instar larvae. 8, Neureclipsis bimaculata (Linnaeus 1758), tip of abdomen, ventral. 9, Cyrnus trimaculatus (Curtis 1834), left anal claw, left lateral. a = basal segment of anal proleg; b = spines; c = anal claw teeth. Scale bar Fig. 8 = 1 mm; scale bar Fig. 9 = 0.25 mm.

FIGURES 3 – 4. Polycentropus ierapetra Malicky 1972, 5 th instar larva. 3, head and thoracic legs, ventral. 4, anal prolegs and claws, left lateral. Scale bars = 1 mm.

FIGURES 1 – 2. Polycentropus ierapetra Malicky 1972, 5 th instar larva. 1, head and pronotum, dorsal. 2, head and pronotum, right lateral. d = projected length of longitudinal axis of muscle attachment spot ‘ m’; m = muscle attachment spot ‘ m’. Scale bars = 1 mm.

FIGURES 5 – 7. Polycentropus spp., 5 th instar larvae. 5, Polycentropus excisus Klapálek 1894, head, dorsal. 6 – 7, Polycentropus flavomaculatus (Pictet 1834), 5 th instar larva: 6, head, dorsal; 7, left anal claw, left lateral. d = projected length of longitudinal axis of muscle attachment spot ‘ m’; m = muscle attachment spot ‘ m’. Scale bars = 1 mm.