Temporal range: Middle Ordovician (Dapingian to Darriwilian), 470–458 Ma
PreꞒ
Ꞓ
O
S
D
C
P
T
J
K
Pg
N
[1]
Artist's reconstruction of O. regulare
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Cephalopoda
Order:
†Orthocerida
Family:
†Orthoceratidae
Genus:
†Orthoceras Bruguière, 1789
Species:
†O. regulare
Binomial name
†Orthoceras regulare
(Schlotheim, 1820)
Orthoceras is a genus of extinct nautiloid cephalopod restricted to Middle Ordovician-aged marine limestones of the Baltic States and Sweden. This genus is sometimes called Orthoceratites. Note it is sometimes misspelled as Orthocera, Orthocerus or Orthoceros.
Orthoceras was formerly thought to have had a worldwide distribution due to the genus' use as a wastebasket taxon for numerous species of conical-shelled nautiloids throughout the Paleozoic and Triassic. Since this work was carried out and re cataloging of the genus, Orthoceras sensu stricto refers to Orthoceras regulare, of Ordovician-aged Baltic Sea limestones of Sweden and neighboring areas.[1]
These are slender, elongate shells with the middle of the body chamber transversely constricted, and a subcentral orthochoanitic siphuncle. The surface is ornamented by a network of fine lirae (Sweet 1964:K224). Many other very similar species are included under the genus Michelinoceras.
^ abPaleontological Institute. "Part K, Mollusca 3". Treatise on Invertebrate Paleontology. Archived from the original on 3 March 2016. Retrieved 5 December 2013.
work was carried out and re cataloging of the genus, Orthoceras sensu stricto refers to Orthoceras regulare, of Ordovician-aged Baltic Sea limestones of...
Media related to Barbarea orthoceras at Wikimedia Commons "Barbarea orthoceras". Plants for a Future. Barbarea orthoceras in the CalPhotos photo database...
differences between this species and Orthoceras novae-zeelandiae from New Zealand are "very slight and dubious". Orthoceras strictum is listed in Tasmania as...
centuries, all such shells discovered were given the "catch-all" name Orthoceras, thus creating a wastebasket taxon. However, it is now known that many...
Diaporthe orthoceras Diaporthe orthoceras f. achilleae Diaporthe orthoceras f. helianthi Diaporthe orthoceras f. orthoceras Diaporthe orthoceras var. decidua...
limestones, nautiloid limestones, or Orthoceras limestones in the geological literature. Although the term Orthoceras now only refers to a Baltic coast Ordovician...
gastropod from the Pliocene of Cyprus. A serpulid worm is attached. Silurian Orthoceras fossil Eocene fossil flower from Florissant, Colorado Micraster echinoid...
Ceratocephala testiculata (syn. Ceratocephala orthoceras, Ranunculus testiculatus) is a flowering plant that is native to Eurasia. Common names include...
underground parts: Arthropodium cirratum, also called rengarenga lily Orthoceras strictum, also called horned orchid Thelymitra pulchella, another orchid...
(1995:40) Shell diameter up to 10.5 cm. Originally described as Orthoceras amplicameratum. Orthoceras ludlowense is considered a synonym. Cameroceras hennepini...
side lobes, much like the leaf-shape of Barbarea stricta and Barbarea orthoceras. With regard to defence chemicals (glucosinolates), it is similar to other...
Vologdinella antiqua, which was originally described and illustrated as Orthoceras? antiquus by Aleksandr Grigoryevich Vologdin [ru] in 1931. The genus was...
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