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Ventral (left) and dorsal aspects of Onychoteuthis banksii, showing classic sagittate fins
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The diamondback squid, Thysanoteuthis rhombus, has full-length rhomboid fins
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Mastigoteuthis magna has very large circular fins, characteristic of its family, Mastigoteuthidae
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Galiteuthis phyllura in dorsal (top) and ventral views, showing its lanceolate fins