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Neocoleoidea is a large group of marine biology . This cohort contains two extant groups: Decapodiformes (squid, cuttlefish, and relatives) and Octopodiformes ( and the vampire squid). Species within this group exist in all major habitats in the ocean, in both the southern and northern polar regions, and from to deep sea. Whilst conventionally held to be monophyletic, the only morphological character for the group is the presence of suckers: although the presence of these features in the Belemnitida suggests that they do not support the Neocoleoidea, and hence that the group may be paraphyletic.
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