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depressed
dorsoventrally flattened


compressed
laterally flattened


globular
resembling a globe

anguilliform
elongated and slender


fusiform
tapers both anteriorly and posteriorly from middle maximum


terminal
mouth opens anteriorly


subterminal
mouth opens a little below terminal


inferior
mouth opens ventrally


superior
mouth opens dorsally

homocercal - rounded
rounded caudal fin; equal dorsal and ventral lobes

homocercal - truncate
straight edged caudal fin; equal dorsal and ventral lobes


homocercal - forked
sharp split caudal fin; equal dorsal and ventral lobes


homocercal - lunate
crescent moon shaped caudal fin; equal dorsal and ventral lobes


heterocercal
asymmetrical caudal fin; vertebral column extends to dorsal lobe; longer dorsal lobe, shorter ventral lobe


diphycercal
symmetrical caudal fin; spine straight to tip of tail with equal dorsal and ventral lobes
