colonial hydroid

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Noble ‘Coral’ (Stylaster nobilis

…a species of colonial Stylasterid hydroid which is endemic to the South African coast from the Atlantic Coast of the Cape Peninsula to Port Elizabeth. Like the unrelated hard corals, noble corals colonies are predatory ans will feed on a variety of plankton which are dispatched by stinging nematocytes.

Classification

Animalia-Cnidaria-Hydrozoa-Hydroidolina-Anthoathecata-Filifera-Stylasteridae-Stylaster-S. nobilis

Image(s): Peter Southwood 

“Minature aeolis” (Tenellia adspersa)

Also sometimes known as the “lagoon sea slug”, the miniature aeolis is a small species of Tergipedid nudibranch, which is distrusted from the Northeastern Atlantic to the Mediterranean Sea, and Caspian Sea. Miniature aeolis are known to inhabit coastal intertidal and sublittoral zones, and feed mainly on hydroid colonies. 

Classification

Animalia-Mollusca-Gastropoda-Heterobranchia-Euthyneura-Nudipleura-Nudipleura-Nudibranchia-Dexiarchia-Cladobranchia-Aeolidida-Fionoidea-Tergipedidae-Tenellia-T. adspersa

Image: USGS

Snowdrop Hydroid (Gattya humilis)

…a delicate species of colonial Halopterdid hydroid which is endemic to an area off the south African coast, ranging from Northern Namibia to KwaZulu-Natal. Snowdrop hydroids typically occur from the littoral zone to ~70 m (230 ft) under water, where they are usually found growing on coralline algae or weed. 

Classification

Animalia-Cnidaria-Hydrozoa-Hydroidolina-Leptothecata-Plumularoioidea-Halopterididae-Gattya-G. humilis

Image: Seascapeza