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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.
Cryptoblastus is a genus of extinct blastoids, a primitive group of echinoderms related to the modern sea lilies. [1] Fossils are found in sedimentary rocks laid down in the Early Carboniferous period some 360 to 320 million years ago.
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 Eocrinoidea were an extinct class of echinoderms that lived between the Early Cambrian and Late Silurian periods. They are the earliest known group of stalked, brachiole-bearing echinoderms, and were the most common echinoderms during the Cambrian.
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This complex clade includes a branch of rhombiferans, blastoids, parabloastoids (as sister to the lone asteroblastid diploporitan available for the study), and crinoids (as sister to an additoinal glyptosphaeritid diploporitan). Two eocrinoids form the outgroup, with the ascocystitid eocrinoid closer to the diploporitans than the gogiid. [6]