How To Use Trilobite In A Sentence
-
There are petroglyph sites, archeological and paleontological sites and, still in Utah, a quarry where you can go and dig for your own trilobite.
Archive 2009-09-01
-
Hundreds of fossils are locked in glass cases, specimens from all over southern Africa: shells and worms and nautiluses and seed ferns and trilobites, and minerals, too; yellow-green crystals and gleaming clusters of quartz; mosquitoes in drops of amber; scheelite, wulfenite.
Memory Wall
-
The Ordovician is best known for the presence of its diverse marine invertebrates, including graptolites, trilobites, brachiopods, and the conodonts (early vertebrates).
-
Some trilobites lost their eyes, probably those that burrowed in mud or lived in lightless parts of the ocean.
-
Ordovician strata are characterized by numerous and diverse trilobites and conodonts (phosphatic fossils with a tooth-like appearance) found in sequences of shale, limestone, dolostone, and sandstone.
-
This problem is reflected in the ongoing uncertainty about the number of biramous appendages in the trilobite cephalon.
-
Darwin predicted that precursors to the trilobite would be found in pre-Silurian rocks … Similarly, Darwin predicted that Precambrian fossils would be found.
Blast From the Past
-
In fact, it is possible that the group is paraphyletic; the last common ancestor of all polymerid trilobites may also have been ancestral to the agnostids as well.
-
Clearly visible within the imprint were the remains of trilobites, extinct marine arthropods.
-
The trilobite eye is in continuity with the rest of its shelly armor.
-
In this paper we report the discovery of a nearly complete trilobite fossil over 680 mm long that yields a reconstructed exoskeletal length of more than 720 mm.
-
Cooccurring macrofossils include 18 species of agnostoid and polymeroid trilobites, some of which are partly silicified.
-
Many of the trilobite fossils found commonly elsewhere in the world are these empty suits of armour.
-
Among crustacea, it is very remarkable that trilobites and limulus-like forms are the only representatives of the class during the paleozoic ages; that macrourans prevailed in the same manner during the secondary period; and that brachyurans make their appearance only in the tertiary period.
Louis Agassiz His Life and Correspondence
-
We know the first animal to have an eye was a trilobite that was a predator as well.
-
Leiocoryphe gemma may be a paedomorphic species derived from some Upper Cambrian trilobite with an effaced cephalon.
-
The sixty pages on palaeontology emphasize geology and stratigraphy and chiefly illustrate trilobites.
-
I assume that, as in Phacops and older trilobites, the cephalon bore one pair of antennae and three pairs of biramous limbs, and each thoracic segment a pair of limbs.
-
In general, trilobites appear to have been benthonic organisms feeding on organic detritus on the sea floor, but some may have captured small soft-bodied organisms which would have been passed forward to the mouth by the limbs.
-
By using trilobite examples they push cladistic biogeography beyond the typical scope because the focus is a marine taxon whose evolutionary history predates the fragmentation of Pangea.
-
The suspicion began to arise that perhaps the Cambrian trilobites may not be really any older than the big dinosaurs, and the latter may not have been all killed off when the big elephants and megatheriums roamed around over America and Europe.
-
Considering Crustacea as an analogy, abnormal secretion of exuviation hormones in trilobite exoskeletons could also have caused irregular ecdysis and given rise to aberrant exoskeletal morphology.
-
They lived through "Paleozoic" time, which, according to Dana, represents twelve of the sixteen parts of all geological time, beginning with the Primordial; or, calling the whole geological time 48 millions of years, the trilobites lived 36 million of years, or three-fourths of all geological time.
Evolution An Investigation and a Critique
-
The biomineralized shells of trilobites, gastropods and brachiopods are preserved within the concretions.
-
Some studies that dealt mostly with Upper Cambrian and Lower Ordovician trilobites included descriptions of brachiopods.
-
Bryozoan and trilobite fragments, brachiopod spines, turrilepadid plates, and multiplacophoran spines are silicified.
-
One modification in trilobites might be that the selection was primarily for exoskeletal morphology rather than limb structure.
-
Furthermore, trilobite faunas in the Early Cambrian were already differentiated biogeographically.
-
But in fact, there are very distinct patterns found in the fossil record of trilobites.
-
They imagined they could distinguish certain geological relations and families, and would talk about trilobites, the Old Red Sandstone period, and the azoic age, or follow random speculation to far-lying conclusions, developing vague humors of phrase and fancy, having altogether a joyful good time.
Mark Twain: A Biography
-
We care for the same reason that we love okapis, delight in the fossil evidence of trilobites, and mourn the passage of the dodo.
-
These fossils include graptolites, trilobites, and various types of microfossils visible only under the microscope.
-
The detailed structure of both exopods and endopods varied, both along the trunk of individual trilobites, and among different taxa.
-
Hundreds of fossils are locked in glass cases, specimens from all over southern Africa: shells and worms and nautiluses and seed ferns and trilobites, and minerals, too; yellow-green crystals and gleaming clusters of quartz; mosquitoes in drops of amber; scheelite, wulfenite.
Memory Wall
-
The Permian extinction, 244 million years ago, devastated the marine biota: tabulate and rugose corals, blastoid echinoderms, graptolites, and most crinoids died out, as did the last of the trilobites.
Paleozoic
-
We describe the oldest chiton, which is the oldest animal fossil, the oldest evidence for the trilobite ancestor; we believe we've solved the Shonisaur murder mystery; and now we're announcing the identity of this serial killer, the Triassic kraken.
NPR Topics: News
-
Tadpole shrimp have outlived dinosaurs, trilobites and mammoths.
-
Many of the trilobite fossils found commonly elsewhere in the world are these empty suits of armour.
-
The sixty pages on palaeontology emphasize geology and stratigraphy and chiefly illustrate trilobites.
-
The section is very fossiliferous, with an abundant brachiopod, bryozoan, coral, and phacopsid trilobite assemblage.
-
She (at least, I think it's a she) finally sends her remote meck Trilobite to search for signs of life.
REVIEW: The Godwhale by T.J. Bass
-
They look for trilobites and fossilised sea creatures that are preserved in the stone along the path, easily spottable for amateur fossil hunters.
-
The Ordovician is best known for the presence of its diverse marine invertebrates, including graptolites, trilobites, brachiopods, and the conodonts (early vertebrates).
-
Fossil groupings of up to 1000 trilobites suggest they were social creatures, at least while molting.
Social Trilobites
-
There he found invertebrates such as trilobites, bryozoa, and brachiopods - fossil remains that serve as a window on deep time.
-
The sixty pages on palaeontology emphasize geology and stratigraphy and chiefly illustrate trilobites.
-
Other marine fossils commonly found throughout the Silurian record include trilobites, graptolites, conodonts, corals, stromatoporoids, and mollusks.
-
The trilobites comprise a major class-level clade of extinct marine arthropods characterized by calcareous, multisclerite, dorsal exoskeletons.
-
Blind, totally eyeless trilobites have given us another indication of the range of trilobite habits and habitats.
-
Unlike the agnostids, polymerid trilobites typically have more than two or three thoracic segments, and the pygidium is usually smaller than the cephalon.
-
The discovery that silicified trilobites could be dissolved out of limestone in dilute acid added more knowledge more quickly than years of patient preparation from crack-out specimens.
-
The distinct adult thorax and pygidia evident in some trilobites probably do deserve recognition as separate tagmata, but this may not be the case among all trilobites.
-
Considering Crustacea as an analogy, abnormal secretion of exuviation hormones in trilobite exoskeletons could also have caused irregular ecdysis and given rise to aberrant exoskeletal morphology.
-
From the very beginnings of life in the sea - the mollusks and trilobites - to the appearance of vertebrates, the author sets the stage for the evolution of sea creatures to land animals, tracing the development of fins to limbs, fish to amphibians and reptiles.
-
By contrast, the trilobites documented herein are from thrombolitic buildups.
-
The trilobite eye is in continuity with the rest of its shelly armor.
-
In recent years Cambrian trilobites and brachiopods have been discovered in Bhutan, close to the eastern syntaxis of the Himalaya.
-
Instead of rudimentary trilobites, I noticed remains of a more perfect order of beings, amongst others ganoid fishes and some of those sauroids in which palaeontologists have discovered the earliest reptile forms.
Journey to the Interior of the Earth
-
Many trilobites also possessed an extended frontal area anterior of the glabella, but expression of segmentation within this region was also unclear.
-
Other fossil groups include diverse rugose corals, some tabulate corals, nautiloids, gastropods, and trilobites.
-
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 invasion was not limited to brachiopods but also included bryozoans, cephalopods, corals, bivalves, gastropods, trilobites, and crinoids.
-
Sundberg interpreted many aspects of trilobite evolution in terms of homeotic change.
