How To Use Eurypterid In A Sentence
-
Eurypterid associations can often be distinguished and related to environmental conditions, such as marine, lagoonal or estuarine, or brackish to freshwater faunas.
-
But whenever I read it it calls forth for me an image that surely was nothing at all like what Eliot had in mind: that silent sea is, for me, the paleozoic one of the Cambrian or Silurian period of four hundred million years ago, and the owner of that pair of ragged claws is the curious mud-crawling creature known as a _eurypterid, _ a vaguely lobsterish thing that reached lengths of eight feet and more.
Asimov's Science Fiction
-
Miller said he also hopes to study the relationship, if any, between Doliodus problematicus and giant, ancient sea scorpions, a type of eurypterid related to horseshoe crabs.
-
Dr Selden said the Megarachne, a giant eurypterid or sea scorpion, is closely related to a creature called Woodwardopterus, from the Carboniferous Period, found in Scotland and with relatives in South Africa.
-
And why I have begun this column with what seems like a chain of free association is something that will probably become only marginally clear to you when I tell you that it was triggered by the news, last year, of the discovery at the Natural History Museum in London of the oldest known insect fossil, embedded in a chunk of a crystalline rock from Rhynie, S.otland known as chert -- a fossil that dates from the very same S.lurian period, four hundred million years back, that saw the flourishing of the eurypterids that T.S. Eliot's "ragged claws" line unaccountably calls to my mind.
Asimov's Science Fiction
-
The most remarkable example is the three-dimensionally preserved soft tissues of the giant conodont animal Promissum pulchrum, eurypterids and other arthropods from the Upper Ordovician Soom Shale of South Africa.
-
Eurypterid cuticle was chitinous and of varying thickness, but generally very thin, and preserved specimens (which were probably mostly molted skins) are usually crushed.
-
Important fossil groups are the trilobites, a large group of Palaeozoic marine arthropods of uncertain affinity, and the eurypterids, Palaeozoic marine forms related to the arachnids.
-
The Chelicerates include among their number both the tiniest (the microscopic Acari or mites) and the hugest (the giant Paleozoic Eurypterida) of all the Arthropoda.
-
Similarly, with the dramatic decline of marine eurypterids (large arthropods) about 410 million years ago, the first large marine predators were lost.
-
In some chelicerates, such as scorpions and some eurypterids, the pedipalps are modified into large claws.