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Fossil evidence for the Hexactinellid class of sponge actually predates the Cambrian Period. Fossils of the genus Paleophragmodictya is the oldest fossil sponge currently known and was found in rocks dating back to the Ediacaran Period of the Neoproterozoic Era.
It is thought that the Extinction events that occured in the early Cambrian effected the early sponges greatly but diversification of Haexactinellida after this brought many new forms. A species of Konyrium has been found in late Cambrian rocks.
Many species were to evolve though out the Paleozoic and Mesozoic Era although hexactinellida would not see maximum diversity until the Cretaceous Period.
What else can I help you with?
What are some examples of hexactinellida sponges?
Glass sponges
What are 2 example species of class hexactinellida?
none........
What has the author Isao Iijima written?
Isao Iijima has written: 'The Hexactinellida of the Siboga expedition' -- subject- s -: Hexactinellida 'Okadaira shell mound at Hitachi' -- subject- s -: Accessible book
What is the index fossil of the Cambrian?
Trilobites are one of the index fossils commonly found in Cambrian rock layers. These ancient arthropods lived in the seas during the Cambrian period and are used by geologists as markers for dating rocks from that time period.
What is the difference between the Cambrian and preCambrian periods?
The difference between The differeence between the Cambrian and Pre-Cambrian is that the Cambrian fossils are ones of hard shell creatures because of thee evolved predators. The difference between Cambrian and Pre-Cambrian is that the Cambrian fossils are ones of hard shell creatures because of the evolved predators.rian fossils Cambrian and Pre-Cambrian is that the Cambrian fossils are ones of hard shell creatures because of the evolved predators.
Why were there no plants during the Cambrian time era?
There were simple plants in the Cambrian Period(542 - 488.3Ma). Fossil algae has been found in Cambrian Rocks. Evidence of primitive algae from the Precambrian Super-Eon has also been found but exact classification has not been established. It is true that embryophytes (Plants we most recognise) did not evolve until the Ordovician Period(488.3 - 443.7Ma).
What is the main difference between the classes Hexactinellida Calcarea and Demospongiae?
In calcarea spicules are calcareous, in hexactinellida spicules are silicious and hexa radiated, in demospongiae spicules are absent but spongin fibres are present. that's why demosponges are used as bathroom sponges
What has not been found in Cambrian rocks?
In Cambrian rocks, large land-dwelling plants and animals have not been found. The fossil record from this period primarily shows marine life, including early arthropods, mollusks, and various microorganisms, but lacks evidence of terrestrial organisms. Additionally, complex vertebrates, such as fish with jaws, are also absent in Cambrian strata, as they appeared later in the geological timeline.
What era did the Ediacaran Fauna Live?
The Ediacarian fauna are from the Cambrian Explosion. The Cambrian Explosion occurred in the Cambrian period. The Cambrian period was part of the Paleozoic era.
Hexactinellida Glass Sponges what is the glass portion made of?
Its made up a fiber that resembles fiberglass.
When was Cambrian College created?
Cambrian College was created in 1967.
When was Cambrian Hall created?
Cambrian Hall was created in 1954.
