Octocorallia
Octocorallia (Alcyonaria; phylum Cnidaria, class Anthozoa) A subclass of sedentary, colonial corals with polyps that always have eight tentacles which are almost invariably pinnate. There are eight complete, unpaired mesenteries and septa, and a ventral groove on the stomodaeum. Skeletal structures are usually made from calcareous spicules.
Octocorallia
Octocorallia (octocorals) A subclass of the class Anthozoa, poorly known in the fossil record, that ranges from Ordovician to Recent. The colony is shaped like a flat fan of interconnecting branches from which project tubes with many zooids. Heliopora is an important reef former. The pennatulaceans (Pennatulacea) are also octocorals.
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Calcareous Sponges , Calcarea (Calcispongea; phylum Porifera) A class of marine sponges that have a skeleton of calcareous spicules. Forms displaying leucon structure are… Colony , colony, any nonself-governing territory subject to the jurisdiction of a usually distant country. The term is also applied to a group of nationals wh… Polyp And Medusa , polyp and medusa, names for the two body forms, one nonmotile and one typically free swimming, found in the aquatic invertebrate phylum Cnidaria (the… Graptolithina , Skip to main content
Graptolithina
Graptolithina (graptolites; phylum Hemichordata) A class of extinct, colonial, marine organisms which secreted a c… Eight , eight / āt/ • cardinal number equivalent to the product of two and four; one more than seven, or two less than ten; 8. (Roman numeral: viii or VIII.)… Colonial , Colonial. Applied to styles of architecture derived from those of the motherland in a colony. American Colonial is a modification of the English Geor…
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Octocorals
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Octocorals