Paucispinigera Freeman

Description

Introduction

Medium-sized, deep red coloured, up to 6 mm long. Eyes paired and almost in contact, dorsal to ventral.

Dorsal Head

Frontoclypeal apotome dilate anteriorly, with SII seta between SI on quadrate sclerite 2; other labral sclerites undifferentiated.

Antenna

Antenna with 6 segments. Lauterborn organs alternate on apices of segments 2 and 3, short style apical on segment 3. Ring organ in basal 1/3 of segment 1, seta absent. Blade ends close to apex of antennal flagellum, accessory blade short or absent.

Labrum

SI plumose, fused basally; SII slender, long apically dissected; SIII slender, short; SIVa normal. Seta premandibularis simple. Labral lamellae broad. Pecten epipharyngis of 3 separate plates, distally with few even-sized teeth. Premandible with 4 teeth.

Mandible

Pale dorsal tooth and 2 distinct inner teeth; mola pigmented and resembling additional inner tooth. Pecten mandibularis strong. Seta subdentalis broad, curved extending to apical tooth. Seta interna inserted on dorsal surface, plumose, 3 branched.

Mentum

Mentum with distinct ventromental component of 8 median teeth, 2 median recessed, 3rd teeth smaller, separated from larger 2nd and 4th lateral teeth, ventromental plate delimitation associated with the 4th pair of teeth. Four (dorsomental) lateral teeth evenly decrease in size laterally. Ventromental plates widely separated medially, about 2 times as wide as high, subequal in width to mentum, curved and coarsely to finely striate, finer nearer median end. Setae submenti simple.

Body

Lateral and ventral tubules absent.

Notes

Taxonomic Notes

A New Zealand endemic, monotypic genus for P. approximata. This first description reveals few features that differentiate from Paratendipes. The shape of the anterior frontoclypeal apotome (dilate versus narrowed) may not be significant once more Paratendipes are known. The four-toothed premandible may be more significant for recognition.

Ecological Notes

The larvae of Paucispinigera approximata are found in streams in New Zealand's South Island.

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