Due to their primitive anatomy, hexanchiforms were previously considered the most basal group of sharks. However, more recent phylogenetic studies indicate that while primitive, … See more

Species are widespread and found across most of the world. They are most common in cold deep water in the tropics, but are also found closer to … See more

• Sharks portal
• Time range of Hexanchiformes species See more

• Froese, Rainer, and Daniel Pauly, eds. (2011). "Chlamydoselachidae" in FishBase. February 2011 version. (Fish Base family reference) See more

Hexanchiform sharks have one spineless dorsal fin located over or behind the pelvic fins and one anal fin. The vertebral column extends into the long dorsal lobe of the caudal fin, while the … See more

Living species
• Family Chlamydoselachidae Garman 1884 (frilled sharks)
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1. ^ The Chimaeras (Holocephali) are arguably more primitive than the Hexanchiformes, but arguably may not be sharks, depending … See more