Archaeocyatha - Wikipedia
Archaeocyatha (/ ˈɑːrkioʊsaɪəθə /, 'ancient cups') is a taxon of extinct, sessile, reef -building [2] marine sponges that lived in warm tropical and subtropical waters during the Cambrian Period.
Archaeocyathid | Cambrian, Sponges, Reefs | Britannica
archaeocyathid, any member of an extinct group of marine organisms of uncertain relationships found as fossils in marine limestones of Late Precambrian and Early Cambrian age (Precambrian time ended about 542 million years ago and was followed by the Cambrian).
Archaeocyatha - Digital Atlas of Ancient Life
Archaeocyath fossils have massive, double-walled, calcareous skeletons that are vase-like in shape. In cross-section, they look like a small circle (inner wall) nested within a larger circle (outer wall); in turn, these circles are separated by divisions (septa) that look like the spokes of a bike.
Archaeocyathids - Geology Science
2023年7月8日 · Archaeocyathids are an extinct group of marine organisms that lived during the early Cambrian period, approximately 541 to 485 million years ago. They are considered to be one of the earliest known forms of multicellular animals and played an important role in the early evolution of life on Earth.
Archaeocyatha - Geology Page
2015年2月16日 · Archaeocyatha or archaeocyathids (“ancient cups”) are extinct, sessile, reef-building marine organisms of warm tropical and subtropical waters that lived during the early (lower) Cambrian period.
Archaeocyathids - Oxford University Museum of Natural History
The archaeocyathids are a rather obscure group of calcifying sponges. They were abundant during the early Cambrian, but declined in diversity and abundance during the late Cambrian, with the last species going extinct just before the start of the Ordovician.
Early Cambrian Fossils At Westgard Pass, California - CoffeeCup …
Yet another fascinating animal preserved in rocks exclusively of early Cambrian geologic age is the enigmatic archaeocythid, an invertebrate type that along with Agmata salterella-Volborthella and Olenellid trilobites thrived in earth's warm shallow seas roughly 528 to 510 million years ago.
Archaeocyatha - SpringerLink
The Archaeocyatha are an extinct group of bottom-dwelling organisms, most of which inhabited warm shallow seas during the Lower and Middle Cambrian.
Their large excurrent opening suggests that archaeocyathids utilized predominantly passive flow; in contrast, animals with constricted excurrent openings, such as sponges, utilize predominantly active, pumped flow.
Archaeocyaths: alternatively explained as consortia of siphonous …
2022年6月1日 · Archaeocyaths are a group of enigmatic calcareous fossils characterised by a worldwide distribution and stratigraphic span (Zhuravlev, 1986, Rigby and Gangloff, 1987), with two exceptions (Debrenne et al., 1984, Wood et al., 1992), limited to early Cambrian time.
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