Genus Oulactis Milne Edwards & Haime, 1851

Museums

Regional Maps

• Oulactis Milne Edwards, H. & Haime, J. 1851. Monographie des polypiers fossiles des terrains palaeozoïques, précédée d'un tableau général de la classification des polypes. Archives du Muséum National d'Histoire Naturelle, Paris 5: 1-504, pls. I-XX [12].

  Type species:

   Metridium muscosum Dayton in Dana, 1846 by monotypy.

Distribution

States

New South Wales, Queensland, South Australia, Tasmania, Victoria, Western Australia

IBRA and IMCRA regions

IMCRA

Southwest Shelf Province (31), Spencer Gulf Shelf Province (33), Western Bass Strait Shelf Transition (34), Bass Strait Shelf Province (35), Tasmanian Shelf Province (36), Southeast Shelf Transition (37), Central Eastern Shelf Province (38), Central Eastern Shelf Transition (39)

Diagnosis

Actiniidae with well developed pedal disc; oral disc wide, round to lobed. Column smooth in its lowest part, otherwise covered with longitudinal rows of adhesive verrucae except in its most proximal part; verrucae becoming smaller towards the margin, compound and set on small lobes. Thin-walled marginal region carrying delicate frond-like papillae set on lobes and forming a ruff below the tentacles; one frond in each exo- and endocoel. No distinct fosse. Acrorhagi present or not, when present they are placed on the oral side of the fronds. Arrangement of tentacles and mesenteries hexamerous, longitudinal muscles of tentacles ectodermal. Most of the mesenteries perfect, reproductive material may appear on all mesenteries except youngest cycles (in some species directive may be sterile). Two well-developed siphonoglyphs and two pairs of directives. Endodermal sphincter diffuse, weak to well developed. Retractors diffuse to restricted, moderately strong to strong, parietobasilar muscles and basilar muscles strong. No zooxanthellae present. Cnidom: spirocysts (in tentacles, may also be found in pedal disc, acrorhagi and oral disc), basitrichs (in all body parts except acrorhagi and fighting tentacles), microbasic b-mastigophores (in filaments and fighting tentacles), microbasic p-mastigophores B (may be found in filaments), microbasic amastigophores A (in filaments, may also be found in pharynx), holotrichs (in acrorhagi, may also be found in the column), in some species rod-like basitrichs (in filaments and column).

General References

Fautin, D.G. 2011. Hexacorallians of the World. http://geoportal.kgs.ku.edu/hexacoral/anemone2/index.cfm

History of changes