Introduction

A. heminuchalis is a small sized species, less than 40mm DML, found in the tropical Pacific. It is very similar to A. siedleckyi from off South Africa and may prove to be a junior synonym of the latter. It is characterized by its proportionally short, robust mantle and a photophore arrangement on the ventral head and mantle in which large photophores have a space surrounding each organ.

Brief diagnosis:

An Abralia (Heterabralia) with ...

• anterior ocular photophore comparable in size to largest of 3 medial ocular photophores but much smaller than posterior ocular photophore.
• irregular photophore series on mid-region of arms IV.