Colonies may form extensive stands. Branches are thin and tapered to a point, hence they have a needle-like appearance. These may be either widely spaced or compact, up to 150 millimetres long, and usually fuse in an irregular manner. Colonies with short thick branches are normally found in habitats exposed to wave action. Corallites are arranged in neat rows along branches. Polyps are not extended during the day.
Pink, less commonly cream, blue or green.
Shallow reef environments especially intertidal reef flats.
Taxonomic note: This species is divisible into several smaller semi-distinct taxonomic units. Source reference: Veron (2000). Taxonomic references: Veron and Pichon (1976), Dai (1989). Additional identification guides: Veron (1986), Sheppard and Sheppard (1991), Nishihira and Veron (1995).
displaying probable distribution of species. Points indicate recorded sightings from OBIS.
Seriatopora hystrix.Philippines.Very fine branches in turbid water.Charlie Veron.
Seriatopora hystrix.Great Barrier Reef, Australia.Most common growth form of the species.Valerie Taylor.
Seriatopora hystrix.Great Barrier Reef, Australia.Common appearance of colonies exposed to wave action.Charlie Veron.
Seriatopora hystrix.Indonesia.Sub-branches are often short and tapered in shallow water.Charlie Veron.
Seriatopora hystrix.Papua New Guinea.Detail of branches of a colony on an upper reef slope.Charlie Veron.
Seriatopora hystrix.Indonesia.S.hystrix (left) has finer branches then S. caliendrum (right).Charlie Veron.