Pseudorthocladius Goetghebuer

Description

Introduction

Medium-sized larvae, up to 6 mm long.

Antenna

Antenna 2/3 length of mandible; 5 segmented with segment 3 much shorter than fourth. Blade extending at least as far as terminal segment. Lauterborn organs small. Style present.

Labrum

Antenna 2/3 length of mandible; 5 segmented with segment 3 much shorter than fourth. Blade extending at least as far as terminal segment. Lauterborn organs small. Style present.

Mandible

Mandible with apical tooth shorter than combined width of 3 inner teeth; mola often sclerotized apically, giving the impression of a fourth inner tooth. Seta subdentalis small. Seta interna with 5-6 plumose branches.

Mentum

Mentum with paired median teeth weakly to well divided and longer than 4 pairs of lateral teeth, outermost tooth often apically bifid. Ventromental plates weak; beard absent.

Maxilla

Maxilla with palp small with bisensillae well developed as is the apical seta. Apparently no lamellae present on galea or base of palpiger. Pecten galearis present. Setae maxillaris long and slender, mainly simple. Appendix seta absent.

Body

Body with anterior parapods reduced and basally fused, bearing small claws and setae. Posterior parapods narrow and separate, with claws. Procercus small, with 1 very long anal seta reaching up to 1/3 of body length, usually with 1-2 fine and short additional anal setae. Anal tubules with 1 or 2 constrictions and up to length of posterior parapods, occasionally longer.

Notes

Ecological Notes

Larval Pseudorthocladius are found in Sphagnum and other mosses, hygropetric water films, acid streams and spring-fed streams.

The genus is known from the Holarctic and Afrotropical region. Species numbers probably overestimate the true, modest diversity.

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