IBBEA   24401
INSTITUTO DE BIODIVERSIDAD Y BIOLOGIA EXPERIMENTAL Y APLICADA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Description of the first-instar larva of Scotobius pilularius Germar, 1824 (Coleoptera: Tenebrionidae)
Autor/es:
VIOLETA A. SILVESTRO; MARIANO C. MICHAT
Lugar:
Ciudad de Mendoza
Reunión:
Simposio; Fourth International Tenebrionoidea Symposium; 2015
Institución organizadora:
CONICET
Resumen:
The Neotropical genus Scotobius Germar (Tenebrioninae: Scotobiini) comprises 61 species distributed from central Peru and southern Brazil to southern Argentina and Chile. Scotobius and five other genera conform the tribe Scotobiini (Solier, 1838), which is abundant in arid and subarid environments endemic to South America. Larval morphology of members of this tribe is very poorly known. Only two species have been described, and both descriptions are superficial and lack comparative precision and detail. In particular, primary chaetotaxy was not emphasized as the first instar is unknown. In this contribution we present the first detailed description of the first-instar larva of a Scotobiini (Scotobius pilularius Germar, 1824), with emphasis on primary chaetotaxy of the cephalic capsule, head appendages, legs, and thoracic and abdominal segments. Larvae were cleared in lactic acid, dissected, and observed under a compound microscope. Drawings were made using a drawing tube attached to the microscope, and digitally inked. First-instar larvae of S. pilularius are characterized by: body smooth, lightly sclerotized; mandibles asymmetrical, with transverse suboval sclerome; thorax strongly convex, pronotum well developed, subquadrate; abdomen ten-segmented; thoracic and abdominal segments with two longitudinal dorsal rows of setae, those on meso- and metathorax and abdominal segments I-VIII inserted contiguously to short blunt cuticular projections; each thoracic segment with three long lateral setae on each side; abdominal segments I-VIII with two lateral setae on each side; abdominal segment IX with four large setae and a distal arrange of pores and minute setae; cephalic capsule, head appendages, and legs with several setae and pores varying in size and shape.