Colobaea Zetterstedt 1837
Creators: name: Bratt, Albertus D.
name: Knutson, Lloyd V.
name: Murphy, William L.
name: Daniels, Anthony A.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Sciomyzidae
Colobaea

description: Keys to third-instar larvae and puparia of Palearctic species of Colobaea
The only keys to genera of larvae and puparia of Palearctic Sciomyzidae are those of Rozkošný (2002) and Knutson & Vala (2011). Rozkošný (2002) provided a key to the puparia of two species of Colobaea (C. distincta and C. pectoralis).
Key to larvae
1 Posterior end with two pairs of reduced, welt-like lobes (Fig. 16); dorsal surface of segments XI–XII tanned, with many fine scales (Fig. 22); anterior spiracles with 14–20 large, fingerlike papillae (Fig. 35). In species of Lymnaeidae. Ireland to Kazakhstan, northeastern Siberia, Russian South Maritime Territory......................................... C. bifasciella
– Posterior end with four pairs of conical lobes (Figs 15, 17–19); dorsal surface of segments XI–XII smooth, white; anterior spiracles with 12–16 small papillae. Various snail prey........................................................ 2
2 Anterior spiracles with 12–14 marginal papillae (Fig. 33); posterior spiracular plates with margins projecting at ends of slits (Fig. 30). In Gyraulus intermixtus. Iran, Pakistan ................................................... C. deemingi
– Anterior spiracles with 14–16 marginal papillae (Fig. 34); posterior spiracular plates subcircular. In species of Anisus, Bathyomphalus, Planorbis, and Lymnaeidae. Widespread in Europe and Middle East....................................... 3
3 Dorsal cornu of pharyngeal sclerite longer than ventral cornu, posterior margin of dorsal cornu irregular, slender; dorsal and ventral cornua converging posteriorly (Fig. 40). In Radix peregra and species of Planorbis. Trans-Palearctic east to eastern Siberia, south to Egypt, Israel .................................................................... C. punctata
– Dorsal and ventral cornua subequal in length, posterior margins less irregular, dorsal and ventral cornua not converging posteriorly (Fig. 41). In Anisus vortex and Bathyomphalus contortus. Trans-Palearctic east to Moscow and northern Kazakhstan; absent from southeastern Europe................................................................ C. pectoralis
Key to puparia
1 Robust form; anterior half expanded to close opening of snail shell whorl, posterior half smaller, twisted; anterior spiracles large, protrudent, with 14–20 large papillae (Figs 24, 27). In species of Lymnaeidae. Ireland to Kazakhstan, northeastern Siberia, Russian South Maritime Territory........................................................... C. bifasciella
– More slender; anterior end expanded to fit tightly within snail shell whorl, body form crescent shaped or subcylindrical in lateral aspect, not twisted; anterior spiracles protrudent or sessile, with 12–16 small papillae. In various species of snails..... 2
2 Anterior spiracles small, sessile; posterior spiracles large, protrudent; dorsal cephalic cap widened to close shell whorl, then narrowed abruptly (Figs 45–46). In Gyraulus intermixtus; septum material may be present. Southwestern Iran, Pakistan ............................................................................................... C. deemingi
– Anterior spiracles large, protrudent; posterior spiracles small, not protrudent; anterior end widened to close shell whorl but not abruptly narrowed (Figs 23, 26, 47–48). In species of Anisus, Bathyomphalus, Planorbis, and Lymnaeidae. No septum material present.............................................................................................. 3
3 Form slender, dorsoventrally compressed, crescent shaped in lateral aspect; anterior spiracles slender, strongly projecting anteriorly (Figs 23, 26). In Anisus vortex and Bathyomphalus contortus. Ireland east to Moscow and northern Kazakhstan ..... ............................................................................................ C. pectoralis
– Form robust, subcylindrical, not dorsoventrally compressed; anterior spiracles subcircular, projecting dorsally (Figs 47–48). In Radix peregra and species of Planorbis. Trans-Palearctic to eastern Siberia, south to Egypt, Israel ............. C. punctata
description: Published as part of Bratt, Albertus D., Knutson, Lloyd V., Murphy, William L. & Daniels, Anthony A., 2020, Biology, immature stages, and systematics of snail-killing flies of the genus Colobaea (Diptera: Sciomyzidae), with overviews of aspects of the tribe Sciomyzini, pp. 1-64 in Zootaxa 4840 (1) on page 55, DOI: 10.11646/zootaxa.4840.1.1, http://zenodo.org/record/4405544