Authors(s)	Seapy, R. R. and Young, R. E.
Year	1986
Title	Concealment in epipelagic pterotrachied heteropds (Gastropoda) and cranchiid squids (Cephalopoda). J. Zool. London (A)210: 137-147.

• Cardiapoda placenta
• Pterotrachea coronata
• Pterotrachea hippocampus