Paralauterborniella Lenz

Description

Introduction

Small, red coloured, up to 5 mm long. Eyes paired, widely separated.

Dorsal Head

Frontoclypeal apotome strongly narrowed anteriorly with straight anterior margin, SIV seta adjacent to, SV on single anterior sclerite (labrum), with labral sclerites fragmentary.

Antenna

Antenna with 6 segments, flagellum equal to basal segment, segment 4 very short. Lauterborn organs alternate on apices of segments 2 and 3, on short pedestals, large style apical on segment 3. Ring organ in middle of segment 1, seta absent. Blade subequal to antennal flagellum, accessory blade moderately long.

Labrum

SI short and broad, apically plumose, fused basally; SII simple, placed on pedestal nearly as long as seta; SIII very slender, short; SIVa large. Seta premandibularis simple. Labral lamellae normal. Pecten epipharyngis of 2 serrated plates. Premandible with 2 teeth.

Mandible

Dorsal tooth absent, apical tooth slender and 3 distinct inner teeth. Pecten mandibularis weak, with 2-3 lamellae. Seta subdentalis simple, short. Seta interna inserted on dorsal surface, plumose, 4 branched.

Mentum

Mentum with median broad pale tooth, ventromentum delimited as median tooth and dark sliver, 1st lateral tooth distinct from median and 2nd lateral tooth, all laterals evenly decrease in size laterally. Ventromental plates separated medially by width of median mental tooth, about 1.3 times width of mentum, curved and coarsely striate. Setae submenti simple.

Body

Lateral and ventral tubules absent.

Notes

Taxonomic Notes

Paralauterborniella larvae are easily recognized by the simple, broadly rounded and pale median mental tooth in combination with the 6 segmented antenna and alternate Lauterborn organs. In addition the SIl are placed on long cylindrical pedestals.

Ecological Notes

Larvae of Paralauterborniella occur in littoral soft sediments of lakes, to some extent also in "Aufwuchs" of stones (P. nigrohalteralis) or in submerged vegetation of shallow standing waters (P. subcincta).

>Three species are known from the temperate zone of the Holarctic. One species is known from tropical South America.

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