denticule

A non-articulated extension of the shaft of a seta or spine [Watling, 1989].

A short, pointed, tooth-like projection of the cuticle [Wilson, 1989].

In cirripeds (Balanomorpha), primary or secondary toothlet on sutural edge of radius of compartment plate or opposed buttress of adjoining plate, serving to strengthen articulation of plates [Moore and McCormick, 1969].

(Order Cladocera):

One in a series of small, tooth-like projections along postabdomen. Number, position, and relative size are of taxonomic importance. (equal, subequal; smooth, serrate; lateral, marginal) [Stachowitsch, 1992].

(Order Stomatopoda):

One of numerous smaller tooth-like projections between larger teeth on telson margin; according to position one may distinguish submedian, intermediate, and lateral denticles [Stachowitsch, 1992].

(Class Ostracoda):

Small, tooth-like projection on outer surface or hinge of valve [Stachowitsch, 1992].