Ordovician Period | Major Events, Extinction, & Facts
WEBAug 9, 2024 · Ordovician seas were filled with a diverse assemblage of invertebrates, dominated by brachiopods (lamp shells), bryozoans (moss animals), trilobites, mollusks, echinoderms (a group of spiny-skinned marine invertebrates), and graptolites (small, colonial, planktonic animals).
Ordovician - Wikipedia
WEBThe Ordovician (/ ɔːr d ə ˈ v ɪ ʃ i. ə n,-d oʊ-,-ˈ v ɪ ʃ ən / or-də-VISH-ee-ən, -doh-, - VISH-ən) [9] is a geologic period and system, the second of six periods of the Paleozoic Era.The Ordovician spans 41.6 million years from the end of the Cambrian Period 485.4 Ma (million years ago) to the start of the Silurian Period 443.8 …
Mollusca - Atlas of Ordovician Life
WEBMollusks are a diverse group of invertebrates which make up a large part of the modern fauna. Included within this category are gastropods (snails), cephalopods (octopi, squids, and nautili) and bivalves (clams and mussels).
Ordovician Period - Natural History Museum
WEBAug 10, 2012 · Artist’s depiction of the rich fauna of the Ordovician. Animals include, from left: Cystoids, jawless fish (Sacabambaspis) captured by a large cephalopod (Endoceras), Rugose corals, brachiopods, trilobite, gastropod (Cyclonema), a …
Ordovician Period - Invertebrates, Fossils, Extinction | Britannica
WEBAug 9, 2024 · Mollusks were also common and included the gastropods, monoplacophorans (limpet-shaped, segmented mollusks), bivalves, cephalopods, chitons, scaphopods (tusk shells), and rostroconchs (single-shelled mollusks).
Ancestral morphology of crown-group molluscs revealed by a new ... - Nature
WEBFeb 6, 2017 · This phylogenetic analysis shows that the newly discovered creature groups with some other forms variously classified as molluscs, stem brachiopods or similar, but places it within the molluscs...
Ordovician Period - Marine Life, Trilobites, Brachiopods
WEBAug 9, 2024 · By the latest age of the Early Ordovician Epoch, trilobites and other organisms dominant in the Cambrian were replaced by a wide range of other marine invertebrates, including corals, bryozoans, brachiopods, mollusks, echinoderms, graptolites, and conodonts. One theory posits that diversification reached a peak by the first age of the Late ...
Bivalvia - Atlas of Ordovician Life
WEBBivalvia is an extant class of facultatively mobile infaunal suspension feeders. Characteristics of the Class. Characterized by paired lateral shelly valves of conchiolin and calcium carbonate joined at hinge by flexible ligament.
Cephalopoda - Atlas of Ordovician Life
WEBMollusks of the class Cephalopoda are agile, bilaterally symmetrical, predacious carnivores that have achieved a structural complexity and metabolic efficiency without peer among unsegmented invertebrates.
Ordovician Period Information and Facts - National Geographic
WEBDuring the Ordovician period, part of the Paleozoic era, a rich variety of marine life flourished in the vast seas and the first primitive plants began to appear on land—before the second largest...
Skip to content