SO1 Manuscript name, Cranston

Description

Introduction

Small sized larvae, 3-4 mm long. Purple in life,

Antenna

Antenna with 6 segments; segment 3 slightly shorter than fourth. 5th subequal to 3rd tapering into very thin, hair-like 6th. Antennal ratio near 2. Ring organ large, in basal quarter. Blade shorter than flagellum. Lauterborn organs large, as long or slightly longer than antennal segment 3.

Labrum

Labrum with SI palmate-plumose; SII simple, strong, SIII simple, weak SIV normally developed. Labral lamella a single broad plate, with short spinules on apical margin. Chaetae simple and pectinate. Pecten epipharyngis consisting of 3 simple, rounded spines. With 2 pairs of simple, plumose chaetulae laterales; chaetulae basales elongate and simple. Premandible with 2 larger and 1 smaller teeth; brush strong.

Mandible

Apical tooth shorter than combined width of 4 inner teeth. Seta subdentalis sickle-shaped, extending to 3rd inner tooth. Seta interna with 5 serrate branches.

Mentum

Mentum with 1 broad median tooth, perhapos with median nipple, usually worn, and 5 pairs of evenly decreasing lateral teeth. Ventromental plate conspicuous, sinuous, lying posterior to first lateral mental teeth, exposing large area of dorsomentum within which evidence of another structure (?plate) may be visible, particularly posteriorly; beard absent.

Maxilla

Maxilla without pecten galearis. Anterior lacinial chaetae broad-based, broader than other broad lacinial chaetae.

Body

Body with anterior parapods with apically finely serrate claws. Procercus slightly longer than wide, basally with weak scale(s), apically with 5-6 short anal setae. Anal tubules. Body setae long, up to subequal to width of segment bearing seta.

Notes

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