Calcaronea - Wikipedia
Calcaronea is a subclass of sea sponges in the class Calcarea. They are Calcarea with the triactines and the basal system of tetractines sagittal (i.e. the rays of the spicule make unequal angles with each other), exceptionally regular. In ontogeny the first spicules to be secreted are diactines. Choanocytes are apinucleate. Calcaronea have amphiblastula larvae
Wikipedia · Text med CC-BY-SA-licens- Beräknad lästid: 30 sek
Calcaronea - Artinformation - Artfakta från SLU Artdatabanken
WebbArtfakta är platsen som samlar relevant information om våra arter. Lär dig känna arten, dess naturvårdsstatus, se kartor och bilder, eller använd nycklar för att artbestämma.
Calcareous sponge - Wikipedia
Of the approximately 15,000 living species of Porifera, only around 400 are calcareans. Some older studies applied the name Calcispongiae to the class, though "Calcarea" is much more common in modern nomenclature.
Calcarean sponges likely first appeared during the Cambrian Period. The oldest putative calcarean genus is Gravestockia, from the "Atdabanian" (Cambrian Stage 3) of Australia. Calca…Wikipedia · Text med CC-BY-SA-licens- Beräknad lästid: 5 min
- Andra har också frågat
Calcarea - Digital Atlas of Ancient Life
WebbOverview. Class Calcarea includes sponges that are small in size and less colorful than other sponge classes. Calcareous sponges have spicules made of magnesium calcite (MgCO3), or may lack spicules altogether.
Calcarea - University of California Museum of Paleontology
WebbThe Calcaronea is more likely a monophyletic group of sponges since they share characteristic larvae and choanocytes, presumably due to common ancestry. The Calcinea is known from the Permian, while probable calcaronean fossils …
Phylogeny and Evolution of Calcareous Sponges: Monophyly of
WebbPhylogeny and Evolution of Calcareous Sponges: Monophyly of Calcinea and Calcaronea, High Level of Morphological Homoplasy, and the Primitive Nature of Axial Symmetry. Syst. Biol. 52(3):311-333, 2003. ISSN: 1063-5157 print / 1076-836X online DOI: 10.1080/10635150390196966.
Calcarea (Calcareous Sponges) | Encyclopedia.com
WebbCalcareous sponges have a skeleton that is made of calcium carbonate (calcite), composed of free diactines, triactines, tetracines, and/or polyactine spicules, to which a solid basal calcitic skeleton may be added, with either cemented basal spicules or which is fully embedded in an enveloping calcareous cement.
Calcarea - an overview | ScienceDirect Topics
WebbIn Calcaronea, three orders are recognized: Leucosolenida, Lithonida, and Baerida. Leucosolenida contains the majority of calcaronean species (9 families, 43 genera, 467 species, Van Soest et al., 2011). Their skeleton is composed of free spicules without calcified non-spicular reinforcements (Borojevic et al., 2000).
Abstract - Oxford Academic
Webb1 juni 2003 · The monophyly of both Calcinea and Calcaronea is retrieved, and the data strongly rejected the competing Homocoela/Heterocoela hypothesis. The phylogeny implies that characters of the skeleton architecture are highly homoplastic, as are characters of the aquiferous system.
Subclass Calcaronea · iNaturalist
WebbCalcaronea is a subclass in the class Calcarea.They are Calcarea with the triactines and the basal system of tetractines sagittal (i.e. the rays of the spicule make unequal angles with each other), exceptionally regular. In ontogeny the …
Gå till innehållsförteckning
