Octuroplata walkeri (Baly, 1865)

Casari, Sônia A. & Queiroz, Jarbas M., 2005, Description of two leaf­miner larvae (Coleoptera: Chrysomelidae: Cassidinae) from the Brazilian Atlantic forest, Zootaxa 1081, pp. 47-59 : 53-57

Octuroplata walkeri (Baly, 1865)

( Figs. 16–31 )

Larva

Body length/width of pronotum (mm): 4/11; 6/14.

Body form elongate, wide, strongly fattened, slightly sclerotized; meso­ and metathorax and abdominal segments I­VIII each with one lateral process on each side, bearing one distal seta ( Fig. 16 ). Integument generally cream; head, pronotum, prosternum and abdominal segment IX yellowish; tarsungulus and spiracular openings sclerotized and brown. Integument granulated especially near and on lateral processes, giving an asperate appearance; granules, in higher magnification, sclerotized and small dentate at apex; all segments (except prothorax ventral and segments IX, X) bearing transverse irregular row of asperities of variable sizes.

Head ( Figs. 22 , 27 ): Prognathous, narrower than prothorax, partially retracted into prothorax; epicranial stem absent; median endocarina well developed, extending between frontal arms; frontal arms V­shaped. Six stemmata each side: three dorsally positioned and three ventrally positioned. Frons bearing 14 pairs of very short setae, two pairs positioned at apex of endocarina and three positioned laterad of clypeal area. Each side of epicranial plate bearing six short setae positioned in longitudinal row near middle; four setae near stemma. Frontoclypeal suture absent. Hypostomal rods well developed. Labrum ( Figs. 22, 23 ) free, transverse with anterior margin rounded; anterior margin with five thick setae each side (2 bifid at apex), one short seta lateromedian and one seta and one pore near base. Epipharynx ( Fig. 24 ) densely setose anteriorly and medially; each side with one group with eight sensorial pores and a longitudinal row with two sensorial pores and one seta at middle. Antennae ( Figs. 25, 26 ) 3­segmented; basal segment short, transverse, bearing three short setae ventrally near middle; median segment elongate, apex with an elongate membranous sensory appendix internally and distal segment externally, one dorsal microsetae near apex and one near middle; distal segment shorter, elongate, inserted lateroexternally of apex of median segment, bearing five short stout setae apically. Mandibles ( Figs. 28, 29 ) robust 5­toothed; one dorsal seta near middle and two lateral setae; penicillus absent. Maxillae ( Figs. 27, 30, 31 ) elongate; cardo indistinguishable; mala with 6–10 stout distal setae, more concentrated dorsally and three dorsal short setae near internal margin. Maxillary palps one­segmented with four distal setae. Stipes elongated bearing ventrally four very short setae and two pores with visible channel on anterior fourth, three short setae near middle and one near base. Labium ( Figs. 27, 30, 31 ) as long as ventral head, apparently formed by unique piece; ligula well developed, anterior margin setose; each side with two pores above palpi; labial palpi one segmented with one seta at base and three at apex; one seta internally near each palp and 13–14 setae below them. Hypopharynx densely setose.

Thorax: Pronotum transverse, sub­rectangular with lateral margins rounded; meso­ and metanotum shorter than pronotum, band­like, slightly wider than pronotum, each side with a lateral process; mesosternum with lateroanterior projection bearing spiracular opening.

Abdomen: Abdominal segments I–VIII band­like, each with one pair of scoli bearing one seta at apex; segments I–VII with dorso­lateral elevated spiracular openings; spiracles ( Figs. 17, 18 ) annular; segment IX narrower than segment VIII, apex bifid, spiracles dorso­apically positioned; segment X ( Fig. 21 ) ventral, reduced, bilobed with four short setae and two pores.

Legs ( Figs. 19, 20 ): Robust 4­segmented; coxa narrow, bearing short setae irregularly distributed; trochanter fused to femur, wider than long, bearing mesally seven short setae near coxa and other setae irregularly distributed, more concentrate internally; tibia shorter bearing 10 setae; tarsungulus sclerotized and wide bearing one lateroexternal seta at base. Material examined. Brazil. São Paulo: Salesópolis, Estação Biológica de Boracéia,

Figures

FIGURES 16 – 21, Octuroplata walkeri (Baly, 1865). Larva: 16, dorsal; 17, 18, spiracle (thoracic, abdominal); 19, 20, prothoracic leg (anterior and posterior view); 21, apex of abdomen (ventral). Figs 19, 20, to same scale. Bars = 0.5 mm, except fig. 16, 1.0 mm and fig. 21, 2.0 mm.

FIGURES 22 – 26 Octuroplata walkeri (Baly, 1865). Larva: 22, head (dorsal); 23, clypeus and labrum; 24, epipharynx; 25, 26, antenna (dorsal, ventral). Bars = 0.5 mm, except fig. 22, 2.0 mm.

FIGURES 27 – 31. Octuroplata walkeri (Baly, 1865). Larva: 27, head (ventral); 28, 29, mandible (ventral, dorsal); 30, apex of maxilla and labium (dorsal), 31, maxilla and labium (ventral). Bars = 0.5 mm.