''Clathrina cylindractina'' is a
species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...
of
calcareous sponge
The calcareous sponges of class Calcarea are members of the animal phylum Porifera, the cellular sponges. They are characterized by spicules made of calcium carbonate in the form of calcite or aragonite. While the spicules in most species hav ...
from Brazil. The species is named after the cylindrical-shaped actines the sponge possesses.
Description
Cormus very delicate, formed of large, irregular and loosely anastomosed tubes. No water-collecting tubes are present, and
oscula are present throughout all the cormus as simple openings on the tubes. The wall of the tubes is thin (25 mm). Its skeleton has no special organisation, comprising only equiangular and equiradiate triactines. Sometimes, it is possible to find a few tetractines. Actines are straight and cylindrical or slightly conical, with blunt tips. Found in cryptic habitats, such as under rocks or even on other organisms, protected against light and wave action.
References
World Register of Marine Species entry
Clathrina
Sponges of Brazil
Endemic fauna of Brazil
Animals described in 1994
{{calcarea-stub