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Leptus
- The six-legged young, or larva, of certain mites; -- sometimes used as a generic name. See Harvest mite, under Harvest.
Lernaeacea
- A suborder of copepod Crustacea, including a large number of remarkable forms, mostly parasitic on fishes. The young, however, are active and swim freely. See Illustration in Appendix.
Lernean
- One of a family (Lern) of parasitic Crustacea found attached to fishes and other marine animals. Some species penetrate the skin and flesh with the elongated head, and feed on the viscera. See Illust. in Appendix.