Calcaronea
| Calcaronea | |
|---|---|
 | |
| Leucandra losangelensis (order Leucosolenida, family Grantiidae) | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Porifera |
| Class: | Calcarea |
| Subclass: | Calcaronea |
| Orders | |
Calcaronea is a subclass of sea sponges in the class Calcarea, generally characterized by asymmetrical three-rayed (triactine) spicules, although some unusual specimens do have evenly-arranged rays. The nucleus of the choanocyte sits at the top of the cell (apinucleate) with the flagellum connected to it. Its larval form is a hollow ball of cells with an opening at one end, or stomoblastula, which eventually turns inside-out and forms a free-swimming, flagellated amphiblastula. Two-rayed (diactine) spicules are the first skeletal structures to develop as the sponge grows.[1]
References
[edit]- ↑ Soest, Rob W. M. Van; Boury-Esnault, Nicole; Vacelet, Jean; Dohrmann, Martin; Erpenbeck, Dirk; Voogd, Nicole J. De; Santodomingo, Nadiezhda; Vanhoorne, Bart; Kelly, Michelle; Hooper, John N. A. (2012-04-27). "Global Diversity of Sponges (Porifera)". PLOS ONE. 7 (4) e35105. Bibcode:2012PLoSO...735105V. doi:10.1371/journal.pone.0035105. ISSN 1932-6203. PMC 3338747. PMID 22558119.
External links
[edit]- World Register of Marine Species link: Calcaronea (+species list)
- "Calcaronea". National Center for Biotechnology Information (NCBI).
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