- labium
- lacinia mobilis
- lacunar
- lamella
- lanceolate
- lappet
- larva
- larval leg 1
- larval pleopod
- lateral
- lateral carapace denticle
- lateral line
- lateral lobe
- lateral organ
- lateral rib
- lateral ridges
- lateral spine
- latus
- leptolid
- leptomedusa
- leptothecate
- life history
- life-cycle
- limb
- lip flap
- lip gutter
- lip rim
- lip shoulder
- longitudinal
- luminescent organ
- Lusitanian