831 species

Pachyseris rugosa

(Lamarck, 1816)


Milne Edwards and Haime, 1849

Characters: Colonies are upright, irregular, usually contorted, anastomosing bifacial plates. They are often over one metre across. Columellae are wall-like lobes.

Colour: Deep bluish-grey or brown.

Similar Species: Pachyseris gemmae. See also P. involuta.

Habitat: May develop into large mound-shaped colonies in shallow water but smaller colonies occur in a wide range of habitats including those exposed to strong wave action.

Abundance: Common.

Taxonomic Note: A species complex.

COTW History since Veron (2000a)
  • Family: All families are currently under review
  • Genus/species: No change