Arachnidium are a genus of colonial ctenostome bryozoans. They lack a calcified cuticle and form dense encrusting colonies on barnacles or other shelled organisms. Individual zooids are roughly 150 microns in size, have a lophophore with about 13 tentacles, and have about 10 to 11 connections to other zooids in the colony.[1]
| Arachnidium | |
|---|---|
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Bryozoa |
| Class: | Gymnolaemata |
| Order: | Ctenostomatida |
| Family: | Arachnidiidae |
| Genus: | Arachnidium |
| Species | |
|
A. fibrosum Hincks, 1880[1] | |
References
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