Podonomopsis Brundin

Description

Introduction

Up to 5 mm long, brown head capsule nearly parallel-sided, slightly longer than broad, with mentum, mandible and occipital margin darkened. Eye spot single.

Antenna

Antenna long, about 50% of head capsule length; 5-segmented, 1st segment long and narrow, segment 3 completely annulate, with segments 4 and 5 poorly differentiated from each other, blade broad, extending to apex of segment 4, Antennal ratio ca. 0.5. Style and peg sensillum weak or absent developed; accessory blade narrow, subequal to blade, without Lauterborn organs.

Labrum

Frontoclypeal apotome present. SI, SII and SIII elongate and enlarged, sickle-shaped in lateral view, all arising from distinct pedestals; SIVa rod-shaped, arising from pedestal longer than rod, SIVb rod-shaped. One simple chaeta, seta premandibularis and well-developed, slightly curved labral rod. Pecten epipharyngis of three basally-fused long scales. Premandible absent. Epipharynx with 3-4 pectinate, 2 simple elongate chaetulae laterales, and 2 robust, simple chaetulae basales; without basal sclerite.

Mandible

Mandible with apical bulge and longer apical tooth and 5 inner teeth, diminishing in size; mola an isolated area. Seta subdentalis apically pointed, arising from anterior surface of mola, seta interna with many simple branches.

Mentum

Mentum with 1 median tooth and 8 pairs of lateral teeth diminishing in an even slope to very small outermost laterals. Ventromental plate miniscule. Setae submenti simple, a little withdrawn from base of mentum.

Body

Anterior parapods fused basally, with separate crowns of serrate claws but without interconnecting fine claws. Spiracles absent. Procercus hyaline, almost indistinguishable from anal tubules, perhaps with small pigmented postero-median field, apically with microscopic tuft of short setae. Posterior parapods stout, with pale, simple, long claws.

Notes

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