Aggregating anemones have specialized tentacles called acrorhagi that are used solely to deter other colonies from encroaching on their space. When a polyp makes physical contact with a non-clonemate, it extends the acrorhagi to attack the competing …

nematocyst, minute, elongated, or spherical capsule produced exclusively by members of the phylum Cnidaria (e.g., jellyfish, corals, sea anemones). Several such capsules occur on the body surface.

Jan 1, 2003 · Upon contact with an approaching threatening sea anemone, the acrorhagi swell, adhere to the body of the target and discharge nematocyst-filled peels (pieces of ectoderm) onto the victim (Lane...

Aggregating anemones have knob-like swellings, called acrorhagi, just underneath their tentacular collar. The acrorhagi are packed with large stinging cells called nematocysts.

The meaning of ACRORHAGUS is one of a series of marginal tubercles found on certain sea anemones each consisting of a local accumulation of nematocysts.

This species has a ring of white knobs, called acrorhagi just outside their ring of tentacles. The acrorhagi are loaded with stinging cells and are used for fighting other anemones (photo, movie).

An acrorhagus is a swelling in the fosse or on the mar-gin that contains holotrichous nematocysts. Following contact with the tentacles or column of member of the same or different species, an acrorhagus will expand, lengthening towards the nearby actiniarian.

Three types of organ (acrorhagi and catch tentacles in sea anemones, and sweeper tentacles in corals) are described with regard to both morphology and ‘aggressive’ function. Species known to possess such organs are listed.

I review and synthesize anatomical descriptions of the marginal structures and find that they consist of two parts: a projection of the column and a holotrich-dense pad (= acrorhagus) that is histologically differentiated from the surrounding tissues.

Outside and below their oral tentacles is a ring of white knobs called acrorhagi. Acrorhagi contain stinging cells (nematocysts) that help individuals fight other anemones (non-clone mates) encroaching their space. Column often appears ribbed or bumpy as a result of the verrucae.