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Blastoids (class Blastoidea) are an extinct type of stemmed echinoderm, often referred to as sea buds. [1] They first appear, along with many other echinoderm classes, in the Ordovician period, and reached their greatest diversity in the Mississippian subperiod of the Carboniferous period. However, blastoids may have originated in the Cambrian.
Blastoids, an example of a single group of blastozoans. Scientific classification; Domain: Eukaryota: Kingdom: Animalia: Phylum: Echinodermata: Subphylum: † Blastozoa: Classes Class Eocrinoidea (Cambrian - Silurian) Class Parablastoidea ; Class Rhombifera (Ordovician - Devonian) Class Diploporita (Ordovician - Devonian) Class Blastoidea ...
A blastoid is an embryoid, [1] a stem cell-based embryo model which, morphologically and transcriptionally resembles the early, pre-implantation, mammalian conceptus, called the blastocyst. The first blastoids were created by the Nicolas Rivron laboratory [ 2 ] [ 3 ] by combining mouse embryonic stem cells and mouse trophoblast stem cells.
They, like other blastoids, superficially resemble their distant relatives, the crinoids or sea lilies, having a near-identical, planktivorous lifestyle living on the sea floor attached by a stalk. As with all other blastoids, species of Pentremites trapped food floating in the currents by means of tentacle-like appendages.
The following cladogram, after Nardin et al. 2017, [10] shows the progression of early eocrinoid families, with all other eocrinoid families (including representatives Trachelocrinus and Ridersia) grouped with "derived Blastozoans" as their relationships with each other and with other blastozoans are not addressed.
This page was last edited on 9 October 2005, at 03:48 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...
At the top of the head there were five small holes, through which food would be ingested and waste products discharged. While common in the early Carboniferous, blastoids are extremely rare in Michigan, occasionally they have been found at the Burkholder in Alpena.
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