| Word: Hypogastralia Description: Gastralia with one actin protruding inward, the other ones oriented tangentially to the atrium Category: Architecture of the Skeleton and Spicules of Hexactinellida |
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| Word: Hypogastralia Description: Gastralia with one actin protruding inward, the other ones oriented tangentially to the atrium Category: Architecture of the Skeleton and Spicules of Hexactinellida |