Smicridea (Smicridea) annulicornis ( Blanchard 1851 )

Sganga, Julieta Valeria & Fontanarrosa, María Soledad, 2006, Contribution to the knowledge of the preimaginal stages of the genus Smicridea McLachlan in South America (Trichoptera: Hydropsychidae: Smicrideinae), Zootaxa 1258, pp. 1-15 : 3-4

Smicridea (Smicridea) annulicornis ( Blanchard 1851)

( Figs. 1–8 )

Hydropsyche annulicornis Blanchard 1851: 140 ; Hagen 1864: 821; Ulmer 1904: 24, 1905a: 68, 1905b: 18.

Smicridea annulicornis: Ulmer 1913: 389 ; Fischer 1963: 131.

Rhyacophylax chilensis Navás 1923: 23 , 1924: 367, 1928: 126, 1930: 361, 1932: 83, 1934: 28; Lestage 1925: 41; Fischer 1963: 136; Flint 1989: 9 (synonym).

Smicridea chilensis: Schmid 1950: 344 [as “ Smicridia”]; Flint 1967: 55; Fischer 1972: 44.

Smicridea (S.) chilensis: Flint 1974b: 88 .

Smicridea (Smicridea) annulicornis: Flint 1989: 9 ; Flint et al. 1999.

Description

Larva. Length: 11.1 to 13.3 mm (n=22). Head capsule reddish brown, with anterior margin of frontoclypeal apotome darker, with pale (yellowish) zones around stemmata, with transverse band in posterior region of parietal apotomes, and lateral longitudinal bands joining these 2 areas ( Figs. 1–3 ). Anterior margin of frontoclypeal apotome symmetrical, crenulate in middle, with small central projection, and 2 deep lateral notches; inconspicuous U­shaped anteromedian depression ( Fig. 1 ). Parietal apotomes with dark reddish brown muscle scars, distributed characteristically as in Figs. 1–3 . Posterior ventral apotome small and triangular. Distribution of muscle scars on pro­, meso­ and metanota as in Fig. 4 . Poststernal sclerites of prosternum lacking. Mesosternum with 2 posterolateral subtriangular sclerites. Abdominal sternum VIII with 2 triangular sclerites bearing setae.

Pupa. Length: 8.0 to 9.4 mm (n=17). Labrum with anterior margin rounded, with row of very long setae in anterior median area, and shorter setae posterior to these; lateral lobes with 4 to 5 long setae ( Fig. 5 ). Mandibles long, with inner margin finely serrated distally, and with long posterolateral setae; right mandible with 3 teeth, and left with 4 ( Fig. 6 ). Abdominal terga with pairs of anterior plates on segments II to VIII (IIa to VIIIa) and posterior plates on segments III and IV (IIIp and IVp) ( Figs. 7–8 ). Plates IIa, IIIa, VIa, VIIa and VIIIa, longer than wide; plates IIIp, IVa, IVp and Va wider than long; all plates with large teeth posteriorly, intercalated with smaller ones, except IIIp bearing large teeth on anterior margin and smaller ones in middle, and IVp fused and bearing large anterior teeth ( Fig. 8 ).

Material examined

ARGENTINA: Chubut Province: Arroyo Esquel, 3.iii.1995, Valverde, 7 larvae; Trevelin, Río Percey, 6.ii.1993, 14 larvae, 17 pupae, 10 pharate males; Trevelin, Río Nahuel Pan (road to Tecka), 11.ii.1993, 1 larva.

Distribution

Argentina (Neuquén Province, Río Negro Province, Chubut Province); Chile.

Figures

FIGURES 1 – 4. Smicridea (Smicridea) annulicornis. Larva. Head capsule: (1) dorsal view, (2) ventral view, (3) lateral view. Thoracic nota: (4) dorsolateral view

FIGURES 5 – 8. Smicridea (Smicridea) annulicornis. Pupa. (5) labrum dorsal view, (6) mandibles dorsal view, (7) dorsal view, (8) dorsal abdominal plates.