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As with all Cnidarians, these organisms have a complex life cycle including a motile planktonic phase and a later characteristic sessile phase. Hexacorallia also include the significant extinct order of rugose corals .
The cnidae, the explosive cells characteristic of the Cnidaria and used in prey capture and defence, are of a single type, there being nematocysts but no spirocysts or ptychocysts. [4] In contrast, the anthozoan life cycle involves a planula larva which settles and becomes a sessile polyp, which is the adult or sexual phase.
Antipathidae is a family of corals in the order Antipatharia, commonly known as black corals. They are generally considered a deep-water taxon; however, some of the most diverse communities are known from tropical shallow waters.
Hence ctenophores and cnidarians have traditionally been labelled diploblastic. [18] [20] Both ctenophores and cnidarians have a type of muscle that, in more complex animals, arises from the middle cell layer, [21] and as a result some recent text books classify ctenophores as triploblastic, [22] while others still regard them as diploblastic. [18]
Image credits: Downey, Jack,, photographer. Many of us love using black-and-white filters on our photos today, but back in the day, that was the only option! Imagine a world where every photo was ...
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Turritopsis life cycle. Two branches from the tree-like colony are shown, with a feeding hydra (A) the tip of each twig. Buds at the base of the hydra (at B) eventually detach and grow into adult jellyfish (K) Scientific classification; Domain: Eukaryota: Kingdom: Animalia: Phylum: Cnidaria: Class: Hydrozoa: Order: Anthoathecata: Suborder ...
This small cnidarian is part of a specialised ocean surface community that includes the better-known cnidarian siphonophore, the Portuguese man o' war. Specialized predatory gastropod molluscs prey on these cnidarians. Such predators include nudibranchs (sea slugs) in the genus Glaucus [4] and purple snails in the genus Janthina.