Mesocoracoid - I

I

• Ichthyoplankton: fish eggs and larvae
• Illicium: a "fishing rod-like" appendage on the head, usually a modified dorsal fin spine
• Imbricate: overlapping, like the shingles on a roof
• Incised: with a notched margin (often referring to fin membranes)
• Incisors: the front or cutting teeth
• Inferior: pertaining to the lower side (usually of the head)
• Interdorsal: between the dorsal fins
• Interorbital: the space between the orbits
• Intromittent organ: a structure to facilitate sperm transfer in some internally fertilizating species
• Iris lappet: a fleshy flap or lobe-like structure in the eye, short and rounded, simple or multiply branched.
• Isthmus: the fleshy projection of the body separating the gill openings