Agnostus, genus of trilobites (an extinct group of aquatic arthropods) found as fossils in rocks of Early Cambrian to Late Ordovician age (those deposited from 540 to 438 million years ago).
What is unusual about Agnostid trilobites?
Agnostid trilobite fossils are very peculiar in that they have no eyes, the head (cephalon) and tail (pygidium) look very similar and the thorax only has two segments. They look like a miniature peanut! They are quite tiny! A small one can be under a millimeter, while a large one is about 10 mm.
What period was the Agnostid in?
Cambrian period Agnostida is an order of arthropod which first developed near the end of the Early Cambrian period and thrived during the Middle Cambrian. They are present in the Lower Cambrian fossil record along with trilobites from the Redlichiida, Corynexochida, and Ptychopariida orders.
Is Elrathia extinct?
Elrathia is a genus of trilobites in the family Alokistocaridae. This genus is extinct. They are fast moving animals.
Are Agnostids extinct?
Introduction. Agnostids (Order Agnostida Salter 1864) are a cosmopolitan group of extinct euarthropods whose calcified tergal elements are widespread in Cambro-Ordovician rocks [1].
How old is Elrathia?
515 Million years old Trilobite – Elrathia kingii These are specimens of Elrathia kingii, a Cambrian period trilobite from the Wheeler Shale in Utah, some 515 Million years old.
Who named Elrathia?
1950 specimens of Elrathia are known from the Greater Phyllopod bed, where they comprise 3.7% of the community. … Elrathia.
| Elrathia Temporal range: Middle Cambrian, 513.0–498.5 Ma PreꞒ Ꞓ O S D C P T J K Pg N | |
|---|---|
| Genus: | †ElrathiaWalcott, 1924 |
| Type species | |
| Conocoryphe kingii Meek, 1870 |
What does Elrathia look like?
Elrathia trilobites have a wide thorax and have short genial spines on their cephalon. Other than that, they are rather plain looking. The typical size of an Elrathia is around an inch. Small ones are mere millimeters in length, while large ones can get around 2 inches in length.
Graduated from ENSAT (national agronomic school of Toulouse) in plant sciences in 2018, I pursued a CIFRE doctorate under contract with Sun’Agri and INRAE in Avignon between 2019 and 2022. My thesis aimed to study dynamic agrivoltaic systems, in my case in arboriculture. I love to write and share science related Stuff Here on my Website. I am currently continuing at Sun’Agri as an R&D engineer.