When the new pair reaches maturity, the original pair is then reabsorbed. When their mantles are 15- 25 mm in length, a second pair of fins begins to develop in front of their first pair. An interesting phenomenon in this squid is the metamorphosis of the size, shape, and position of the fins as they grow. There are two fins on the dorsal (upper) surface of their mantles. Suckers are found on the distal half of their arms. They were at first thought to be arms, however they are different in structure and composition, therefore they are believed to be a uniquely derived trait of this amazing species. Vampyroteuthis infernalis has eight long arms and two filaments that extend well past the total length of their body which they can retract into pockets found in their webbing between their arms. Like true squids, there is sexual dimorphism in size: females are larger than males. They are small “squids” reaching maximum lengths of 28 cm (with mantle lengths of typically 7.9- 12.1 cm (Robison et al., 2003)). Vampire squids, which are not technically true squids, are named for their blue eyes, reddish-brown skin and webbing between their arms. Vampire squid, Vampyroteuthis infernalis (Chun, 1903) – which translates to “vampire squid from Hell”, are the only known members of the Order Vampyromorphida, the seventh order in the Class Cephalopoda and they combine features from both octopodiformes (octopuses) and decapodiformes (squid, cuttlefishes, etc.) suggesting it may represent an ancestral line between the two groups (Robison et al., 2003). Frequently Asked Questions (FAQs) INTERVIEWS.Marine Biology Degree Programs Worldwide.Marine Biology Degree Programs in the U.S.Geological Makeup of Marine Environments.Worldwide Aquariums and Marine Life Centers.Ocean Mysteries: Did Life begin in the Ocean?.Marine Biology Laboratories, Institutes & Graduate Programs.Marine Science/Ocean Life Related Journals. ![]() A History of the Study of Marine Biology.
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