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. 2014 Sep 26;9(9):e108110. doi: 10.1371/journal.pone.0108110

Figure 2. Schematic representation of the morphological features recorded for the analysis of geographic variation of sea lamprey in Portugal.

Figure 2

(a) lateral view outline with the representation of the measured morphometric characters: TL, total length; d, disc length; d-a, distance between disc and anus; a-C, tail length; B7-C, postbranchial length; B7-a, trunk length; d-D1, predorsal distance; d-eD1, distance between disc and posterior end of first dorsal fin; d-D2, distance between disc and base of second dorsal fin; D2-C, dorsal part of caudal fin length; lD1, first dorsal fin length; lD2, second dorsal fin length; D-D, distance between dorsal fins; H, body depth; d-O, preocular distance; O, eye diameter; O-B1, postocular length; Hco, head depth; d-B1, prebranchial length; B1-B7, branchial length; d- B7, head length; d-n, prenostril length; IO, interocular distance; HW, head width; (b) photograph of the oral disc with the representation of the counted meristic characters: AF, anterior field; LFR, lateral right field; LFL, lateral left field; PF, posterior field; SO, supraoral lamina; L, lingual lamina; IO, infraoral lamina; TNteeth, total number of teeth; AFteeth, number of teeth in the anterior field; LFteeth, number of teeth in the lateral field; PFteeth, number of teeth in the posterior field; TNrows, total number of rows; AFrows, number of rows in the anterior field; LFrows, number of rows in the lateral field; PFrows, number of rows in the posterior field; IOcusps, number of cusps in the infra-oral lamina).