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The hydrocaulus is usually surrounded by a sheath of chitin and proteins called the perisarc. In some species, this extends upwards to also enclose part of the polyps, in some cases including a closeable lid through which the polyp may extend its tentacles. [2] In any given colony, the majority of polyps are specialized for feeding.
Monosiphonic or polysiphonic hydrocaulus are companions of erect colonies. [1] Bougainvillia aberrans is distinguishable in the sense that the degree of reduction of its medusa is unique compared to species of same genus. Moreover, B. aberrans is suppressed in the medusa stage. Hydroids of B. aberrans feed on fragments of other cnidarians. [4]
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Ram feeding and suction feeding are on opposite sides of the feeding spectrum, where extreme ram feeding is when a predator swims over an immobile prey item with open jaws to engulf the prey. Extreme suction feeding is demonstrated by sit-and-wait predators that rely on rapid depression of the jaws to capture prey (e.g., frogfish, Antennariidae).
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The branching system is alternate. The polyps are tiny and are supported by a hydrocaulus, a fairly stiff hollow tube with a perisarc (sheath) made of chitin and protein. This is dark brown or blackish, but is often colonised by algae and diatoms giving it a muddy appearance. [2] The whitish polyps are tinged with red.
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