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Arachnactidae
The ceriantharian Arachnanthus sarsi, Rathlin Island, Northern Ireland.
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Cnidaria
Subclass:	Ceriantharia
Order:	Penicillaria den Hartog, 1977
Family:	Arachnactidae McMurrich, 1910
Genera
See text

Arachnactidae is a family of tube-dwelling anemones in the order Ceriantharia. It is the only family in the monotypic order Penicillaria and comprises around 38 species. They differ from other ceriantharians in the makeup of their cnidome (the types of cnidocyte present), the relative sizes of the oral discs and the shape and structure of the mesenteries. These tube anemones dwell in parchment-like tubes immersed in soft sediment, and have two whorls of tentacles, the outer ones being much longer than the inner ones.

Genera

The World Register of Marine Species includes the following genera in the family :

• Anactinia Annandale, 1909
• Arachnactis Sars, 1846
• Arachnanthus Carlgren, 1912
• Dactylactis Van Beneden, 1897
• Isapiactis Carlgren, 1924
• Isarachnactis Carlgren, 1924
• Isarachnanthus Carlgren, 1924
• Isovactis Leloup, 1942
• Ovactis Van Beneden, 1897
• Paranactinia Carlgren, 1924

References

1. Goffredo, Stefano; Dubinsky, Zvy (2016). The Cnidaria, Past, Present and Future: The world of Medusa and her sisters. Springer International Publishing. p. 66. ISBN 978-3-319-31305-4.
2. Molodtsova, T. (2015). Arachnactidae McMurrich, 1910. Accessed through: World Register of Marine Species on 2016-02-10

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