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Adipose fin - small fleshy finlet between dorsal and caudal fin.
Anal fin - see Figure 4
Anterior - toward the head.
Axil - base of the pectoral fin.
Barbel - fleshy protuberance or extension of the chin.
Bars - broad dark vertical markings along the sides of the body.
Blotch - irregularly shaped dark spot.
Caudal fin - tail fin (see figure 4).
Caudal peduncle - narrowest part of the body between the caudal fin base and the anal fin.
Cirri(us) - fleshy branched or unbranched skin filaments, usually on the head.
Compressed -laterally flattened.
Cryptic - camouflaged or inconspicuous.
Deep (-bodied) - high dorso-ventral profile.
Denticles - minute tooth-like scales of sharks and rays.
Dorsal - toward the back or upper surface.
Fin ray (soft ray) - segmented and usually branched fin-supporting element.
Fin spine (spine) - hard unsegmented and unbranched fin element.
Finlets - small median fins posterior to dorsal or anal fins.
Gill rakers - tooth-like, spine-like, or filament-like anterior projections of gill arches.
Gill slits - multiple gill openings seen externally on sharks,
rays and some jawless fishes.
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Lateral line - part of the sensory system of fishes often seen
externally as a series of pores (pored or channeled scales in
fishes with scales) along sides of the body.
Margin - edge or fringe.
Maxilla - bone forming the most posterior part of the upper jaw. -
Medial - along the midline that separates the body into right and left halves.
Median fins - medial fins (dorsal, anal, caudal, finlets).
Oblique - at an angle.
Ocelli(us) - spots with contrasting rings or margins.
Operculum - gill cover of bony fishes. _
Pectoral fin - lateral paired fins (see Figure 4).
Pelvic fins - ventral paired fins (see Figure 4).
Posterior - toward the tail.
Preoperculum - anterior most bone of the gill cover with free edge in bony fish.
Scute - modified scale usually forming a ridge or keel.
Serrated - having saw-like notches along an edge.
Spiracle - rudimentary gill slit found behind the eye in rays and in some sharks.
Stripes - horizontal markings along the sides of the body.
Ventral - toward the belly.
Ventral fins - pelvic fins.
Vomerine teeth - teeth on the vomer ( mterior or midline roof of the mouth).