L
- Lanceolate: spear-shaped, gradually tapering toward the extremity
- Labial: pertaining to the lips
- Labial furrows: shallow grooves around the lips
- Labial papillae: small fleshy projections around the lips
- Lateral: at or toward the side
- Lateral line: a series of muciferous tubes forming a raised line along the side of the body
- Leptocephalic: tallness and narrowness of the skull - in fish usually refers to "elongate highly compressed transparent, ribbon-like larval stage" (source FishBase glossary)
- Liver: a digestive and storage organ
- Longitudinal series (scales): the number of scale rows above the lateral line from the first pored lateral line scale to the caudal fin base.
- Lunate: shaped like a crescent moon, with long upper and lower lobes
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