Arthuria dubia

Arthuria dubia
Scientific classification
Kingdom: Animalia
Phylum: Porifera
Class: Calcarea
Subclass: Calcinea
Order: Clathrinida
Family: Clathrinidae
Genus: Arthuria
Species: A. dubia
Binomial name
Arthuria dubia
(Dendy, 1891)
Synonyms
  • Clathrina dubia (Dendy, 1891)
  • Leucosolenia dubia Dendy, 1891

Arthuria dubia is a species of calcareous sponge in the genus Arthuria from Australia. The name is derived from Dendy's uncertainty about the validity of the species, believing his specimens could, in fact, represent juvenile Leucosolenia cavata (now Ascaltis cavata).

Description

Cormus formed of irregular and loosely anastomosed tubes. There is no cortex but sometimes it appears that some of the tubes could be forming one. The wall of the tubes is thick, up to 100 μm. In some areas the tubes are hispid.

Cells with yellow granules are present in the mesohyl, as are embryos, which are always found near choanocytes. The cells with yellow granules are distributed homogeneously, throughout the mesohyl.

The skeleton consists of equiangular and equiradiate triactines. Tetractines are also present, but they are rare. Actines are conical or cylindrical, but they always have sharp tips. Sometimes, they are slightly undulated. Diactines are abundant on the external tubes; they are curved or straight, vary in size and have sharp tips, one of which is club-shaped. The largest diactines are curved at the tip. They project through the surface in some parts of the cormus only, and the club-shaped portion of the spicule lies inside the tube.[1]

References

  1. Klautau; Valentine (2003). "Revision of the genus Clathrina (Porifera, Calcarea)". Zoological Journal of the Linnean Society. 139: 1–62. doi:10.1046/j.0024-4082.2003.00063.x.

World Register of Marine Species entry

This article is issued from Wikipedia - version of the 10/29/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.