Taxonomy of Finfish

2.3.5 Definitions of Position

U Maxillary symphysis

L Mandibular symphysis

OO Anterior edge of orbit

O Posterior edge of orbit

J Posterior edge of mandible (buccal commissure)

Y Gill-cover notch

G’ Posterior bony edge of operculum

G Posterior membranous edge of gill cover

P Anterior point of insertion of the first pectoral fin ray

D1 Insertion of anterior dorsal (intersection of anterior margin of first dorsal spine,

fin held erect with the contour of the back)

D1’ Position of last ray of anterior dorsal

D2 Insertion of first ray of posterior dorsal

D2’ Position of last ray of posterior dorsal

Z Anterior edge of cloaca

A Insertion of first anal fin ray

A’ Position of last anal fin ray

B Insertion of dorsal lobe of caudal fin

S Posterior tip of urostyle (forward protuberance of hypural blade)

S’ Posterior edge of fleshy peduncle or of pigmented zone

S’’ Point of upper caudal keel

S’’’ Posterior limit of silvering (either last scale of the lateral line or the posterior zone

limit of the scale covered by the peduncle)

F Cartilaginous tip of shortest (median) caudal ray

F’ Membranous edge of caudal fin at fork

N Distal tip of the longest caudal fin ray with lobe normally extended

N’ Distal tip of the longest ventral fin ray with lobe normally extended

M Point where line NN’ intersects median longitudinal axis

M’ Mid point of line MN’

X Distal tip of longest dorsal caudal fin ray, with lobe brought to the median

longitudinal axis

X’ Distal tip of the longest ventral fin ray, with the lobe brought to the median

longitudinal axis