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bivalved carapaces, which vary in morphology between species. The front and rear edges of the carapaces bear forward and posterior facing spines, respectively which in some species are greatly elongated. The carapaces of Isoxys are typically in length (with the juveniles of some species being as small as ), excluding the spines, though some species are known to reach over . In long-spined species when including spine length, some specimens exceed . The possible species Isoxys? giganteus has a carapace length including the spines of . The opening

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