Creative Commons Licence
Imaging technique: 

Strong agonistic behavior by a male L. plei showing the "lateral display" body pattern to another male (not in view). The primary components of this pattern are the vivid lateral flame markings on the side of the mantle and the dark crimson ventral ridge (only visible along the bottom edge of the mantle against the squid in the background). This ventral ridge is actually a fold of skin that is muscularly protruded downward in this body pattern. The lateral flame markings are typically expressed only unilaterally on the side of the squid facing the opposing male. See this image for similar behavior.

Maturity: Adult; Sex: Male; Lab or Wild: Lab; Origin: Nw gulf of mexico

Roger Hanlon
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith