Adicella cremisa, Malicky, 1972

Graf, Wolfram, Waringer, Johann, Dürregger, Alexander & Vitecek, Simon, 2018, Description of the larva of Adicella cremisa Malicky 1972 and a larval key to Central European species of Adicella McLachlan 1877 (Trichoptera: Leptoceridae), Zootaxa 4379 (1) : -

Adicella cremisa —Larva

Head ( Figs. 3A–3D ). Head capsule hypognathous, elongate, with smooth surface; head capsule distally narrower, width of proXimal part dorsal of eyes uniform. As in all final instar larvae of Leptoceridae , subocular ecdysial lines present on parietalia, running from foramen occipitale on each side of head to lateral section of parietalia below eye, then anteriorly of eye bending dorsad and meeting frontoclypeal suture ( Fig. 3C , arrow). Head capsule light beige with typical colouration ( Figs. 3A, 3B, 3C ): Frontoclypeus, adjacent parts of parietalia, parietalial areas around coronal suture, and ventral occipital margin dark brown; ventral apotome brown, quadrangular with rounded corners; brown portions of lateroventral sclerites defined dorsally by subocular ecdysial suture; lateral portions of parietalia with distinct, dark brown muscle attachment spots dorsally and ventrally. Head capsule with complete set of primary setae. Frontoclypeus ogival, without distinct medial constriction. Labrum light brown, with setal brushes and all primary setae. Mandibles stout, not elongate. Antennae near distal parietal borders, long (more than 6X longer than wide), each with single apical seta.

ThoraX ( Figs. 3A–3D ). ProthoraX fully covered by 2 large sclerites, each beige to brown with several dark brown muscle attachment spots; with dark spot in posterior half along ecdysal line. Including anterior setal rows, 35–37 setae of varying lengths distributed over each pronotal half. Mesonotum fully covered by 2 large sclerites, each beige to light brown with several light brown to brown muscle attachment spots. Including anterior setal rows, 7–8 setae distributed over each mesonotal half; some setae of setal area 3 (sa 3) on translucent cuticle bordering these sclerites. Metanotum completely unsclerotized; metanotal setal areas sa 2 and sa 3 each with single seta only; setal area sa 1 not developed and without setae. Metasternum with transverse band of setae on either side, each comprising 3–4 setae.

Legs ( Figs. 3H–3J ) yellowish beige, with numerous setae; forelegs each with dense fringe of setae on ventral edges of coXa, trochanter, and femora; tarsal claws of midlegs evenly curved; hind legs much longer than midlegs, as typical for this genus. Foretrochantins each with single seta.

Abdomen ( Figs. 3E, 3F ). Abdomen white, cylindrical. Abdominal segment I with 3 protuberances dorsally and laterally; dorsal setal areas sa1 and sa3 not developed and without setae, dorsal setal areas sa2 with single setae on either side; lateral sclerite on each side with strongly sclerotized, dark, thick, evenly curved posterior process without ventral protrusion; each lateral sclerite with 1 seta. Abdominal tergum IX with weakly sclerotized sclerite, bearing 8 long terminal setae; abdominal segment IX with 1 posterodorsal seta on each side. Anal prolegs weakly sclerotized, each with large lateral sclerite and more strongly sclerotized anal claw and little accessory hook; each proleg bearing several long setae; spines or tines on anal prolegs absent. Areas between anal orifice and anal prolegs covered with dense tuft of fine setae; sclerotized, spinate sclerites around anal orifice absent. Gills and lateral lines not visible.

Case ( Fig. 3 G ). Case of final instar larva constructed of plant material (possibly roots of Glyceria maxima ), in typical spiral organization: Cylindrical pieces of plant material fastened together along helical plane; with each rotation, case diameter and lengths of pieces increasing anteriorly.

Figures

FIGURE 3. Adicella cremisa larva and Case. 3A, head, thorax, and abdominal segment I, dorsal; 3B, head, thorax, and abdominal segment I, ventral; 3C, head, thorax, and abdominal segment I, right lateral [legs removed]; 3D, head, thorax, and abdominal segment I, right lateral [natural habitus]; 3E, abdominal segments VI–X, right lateral; 3F, abdominal segments VII– X, dorsal; 3G, Case, left lateral; 3H, right foreleg, anterior; 3I, right midleg, anterior; 3J, right hind leg, anterior.