Pseudokiefferiella Zavrel

Description

Introduction

Medium-sized larvae, up to 7 mm long.

Antenna

Antenna with 5 segments; consecutively shorter or 5th longer than 4th. Lauterborn organs small. Style about as long as segment 3.

Labrum

Labrum with SI short, seta-like; SIII simple. Labral lamellae consisting of 2 pectinate lobes. Chaetae with long branches; chaeta media pectinate; 4-5 pairs of single to multi-pointed spinulae present. Pecten epipharyngis consisting of 5 elongate, helmet-shaped scales. Chaetulae laterales simple. Ungula broadly U-shaped; basal sclerite elongate. Premandible broad, apically with 5-6 teeth; lateral spine simple.

Mandible

Mandible with apical tooth slightly larger than first inner tooth. Seta interna with 21-28 weakly serrate branches.

Mentum

Mentum with one median and 7-8 pairs of lateral teeth; median tooth not much larger than first lateral lateral tooth. Ventromental plate small. Setae submenti arising closer to mentum than to postoccipital margin.

Maxilla

Maxilla with palp about as long as wide. Chaetulae of palpiger scale-like with 1 or more points. Lamellae of galea setose. Setae maxillaris simple.

Body

Body with anterior and posterior parapods separate, each bearing an apical crown of claws. Procercus longer than wide, bearing 6-8 anal and 2 subapical setae; proximal subapical seta about 2/3 length of anal setae. Body setae long and dark brown to black.

Notes

Taxonomic Notes

The larvae of Pseudokiefferiella resemble those of Diamesa except in the long dark body setae and the well-developed procercus bearing a strong subapical seta and 7-8 anal setae. The chaetulae of the palpiger are scale-like, not setose as in Diamesa.

Ecological Notes

The larvae of Pseudokiefferiella inhabit small streams and hygropetric zones. There is one named species, P. parva (Edwards), from western Europe and several undescribed species including larva.

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