Baeotendipes Kieffer

Description

Introduction

Large larvae, to 12 mm long. Red.

Dorsal Head

Frontoclypeal apotome present, isolated labrum bearing SI setae, SII off apotome or labrum, labral sclerites 3 and 4 fragmentary.

Antenna

Antenna with 5 segments. Ring organ in proximal 1/2 of 1st antennal segment. Lauterborn organs opposite on apex of 2nd segment. Antennal blade not extending to flagellum apex, accessory blade about 1/2 as long as segment 2. Style on apex of 2nd segment, about as long as segment 3.

Labrum

SI seta plumose on each side, SII simple, SIII short, simple, SIVa simple sensillum. Labral lamellae normal. Pecten epipharyngis simple, of 15-30 small teeth. Premandible with 5 apical teeth, brush strong; seta premandibularis simple.

Mandible

Mandible with pale dorsal tooth, apical tooth dark, with 3 pointed inner teeth. Seta subdentalis simple, extending to base of apical tooth. Seta interna of 4-5 plumose branches. Pecten mandibularis with toothed lamellae. Basally with radially-arranged striae or furrows on outer surface.

Mentum

Mentum with trifid median tooth with outer toothlets modest in size and part fused, smaller than median tooth, 6 pair of laterals, regularly decreasing in size with 2nd pair smaller than 1st and 3rd. Ventromental plates separated medially, about as wide as mentum, with numerous fine striae.

Body

Without lateral or ventral tubules; anal tubules flattened humps.

Notes

Taxonomic Notes

Baeotendipes larvae can only be positively separated from Chironomus larvae by their reduced anal tubules, a character which may be explained by their polyhalinic habitat and which does not merit generic rank. It is therefore possible that Baeotendipes, despite the characteristic hypopygium of the imago, represents a further subgenus of Chironomus, analogous to the subgenus Camptochironomus.

Ecological Notes

Larvae of Baeotendipes occur in sediments of polyhaline waters ('salterns'). Few species are known from the western Palaearctic, Afrotropical and Oriental regions.

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