Genus Actinernus Verrill, 1879
- Actinernus Verrill, A.E. 1879. Brief contributions to zoology from the Museum of Yale College. No.42. Notice of recent additions to the marine fauna of the eastern coast of North America. No.5. Polyzoa. American Journal of Science 3 17: 472-474 [474].
Type species:
Actinernus nobilis Verrill, 1879 by monotypy.
Distribution
States
South Australia
Extra Distribution Information
Cold and temperate waters of Pacific and Atlantic Oceans. New Australian record (C.C. Wallace, A.L. Crowther & D.G. Fautin, unpublished data)
IMCRA
Southern Province (8)
Other Regions
Australian Antarctic Territory
Diagnosis
With a pedal disc either flat adherent or with a cup-like base which encloses a cavity full of mud or foreign matter such as small stones. Column usually elongate, divisible into scapus and scapulus, the former tuberculate and provided with a weaker or stronger cuticle. Arrangement of tubercles variable, sometimes tending to form longitudinal rows. Coronal tubercles mostly 12 or a multiple of 12, sometimes merging into ridges of the scapulus. Scapulus usually with 12 ridges, which are sometimes broken up into tubercles. No cinclides. Sphincter strong, mesogloeal. Tentacles 96 in number or a few more, hexamerously arranged. All or some tentacles more or less distinctly thickened on the aboral side at the base. Longitudinal muscles of tentacles ectodermal, radial muscles of oral disc ectodermal or more or less mesogloeal, not decidedly stronger over the exocoels than over the older endocoels; siphonoglyphs well developed. Pairs of mesenteries 48 or a few more, two pairs of directives. Six pairs of perfect and sterile mesenteries. No more mesenteries distally than proximally. Retractors of mesenteries as a rule diffuse. Cnidom as for suborder.
History of changes
| Published | As part of group | Action Date | Action Type | Compiler(s) |
|---|---|---|---|---|
| 05-Aug-2022 | 13-Aug-2013 | MOVED | ||
| 05-Aug-2022 | 03-Jul-2012 | MODIFIED | ||
| 11-Nov-2010 | ADDED |