Acricotopus Kieffer

Description

Introduction

Medium-sized larvae, up to 8 mm long.

Dorsal Head

Undescribed.

Antenna

Antenna 5 segmented, with segments consecutively shorter. Ring organ in proximal 1/3. Blade arising from apex of 2nd segment, ending near apex of flagellum; accessory blade seemingly absent. Lauterborn organs about half length of segment 3.

Labrum

Labrum SI bifid with only outer or both branches subdivided, remaining S setae simple and fine. Labral lamellae absent, chaetae and spinulae numerous. Pecten epipharyngis of 3 simple scales; median scales longer than lateral pair. Ungula V-shaped; basal sclerite absent. Premandible with 1 distinct apical and 1 broad inner tooth; brush absent.

Mandible

Mandible with apical tooth slightly longer than combined width of 3 inner teeth. Seta subdentalis apically notched. Seta interna absent.

Mentum

Mentum with 1 broad median and 6 pairs of lateral teeth; median tooth with anterior margin notched, dividing tooth into 4 parts. Ventromental plate broad, long beard present. Setae submenti simple.

Body

Anterior and posterior parapods separate, each bearing crown of claws. Procercus shorter to slightly longer than wide, with 5-7 apical anal setae. Anal tubules shorter than posterior parapod. Body with simple setae.

Notes

Ecological Notes

Larval Acricotopus live in small bodies of standing and flowing waters, some temporary bodies of still water such as bog pools, and in the littoral zone of lakes.

The genus is Holarctic and Oriental, with five species described from the Holarctic although the validity of all of these is uncertain. Records under this genus name in Australia refer to Botryocladius freemani.

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