Definitions

A spine arising from the lateral margin of the first segment of the antennular peduncle in shrimps. [Chace and Hobbs, 1969]
Pointed scale arising from the lateral base of the first segment of the antennular peduncle (Fig. 3B). [Perez Farfante and Kensley, 1997]
Rounded or spiniform process on outer part of proximal segment of antennular peduncle in some decapods (e.g., natantian decapods).
(syn. antennular scale) [Moore and McCormick, 1969]
Rounded or spiniform process on outer part of proximal segment of antennular peduncle.
(syn. antennular scale) [McLaughlin, 1980]
Scale arising from lateral base of first article of antennular peduncle. [Poore, 2004]
Spine arising from lateral margin of first segment of antennular peduncle. [Butler, T. H.]
Spine or rounded lobe on lateral aspect of basal article of antennule. [Williams, 1984]
(Taxon-specific: Order Decapoda) In antennule of shrimp-like (natantian) decapod, process projecting from outer (lateral) part of first segment of peduncle. Extending over and considered to protect statocyst. (scale-like, spiniform; tip: lanceolate, pointed, rounded, truncate; margins: convex, fringed with hairs, linear, sinuous, straight).
(syn. antennular scale, antennular spine) [Stachowitsch, 1992]