Campbelloceras is a tarphyceratidnautiloid known from the Lower Ordovician, Upper Canadian Epoch of North America, where it is widespread. Campbelloceras was named by Ulrich and Foerste in 1936.
The shell of Campbelloceras has a circular whorl section, only slightly impressed, and a siphuncle that is close to the venter in all growth stages. Campbelloceras differs from Tarphyceras in that the rate of expansion is greater, the siphuncle is proportionally larger, and an impression is shallower.
Campbelloceras may have given rise to the barrandeocerid Plectoceras (Plectoceratidae) through simplification of the connecting rings, and to Tarphyceras through tighter coiling, development of a deeper impression, and reduction in the size of the siphuncle. Campbelloceras may be conceivably derived from Estonioceras (Estonioceratidae). The cross section of Campbelloceras and that of the outer whorl of Estonioceras are similar, except for Campbelloceras being slightly impressed. Both have proportionally large siphuncles, near the venter.
Referencesedit
Flower, R.H 1984; Bodeiceras A New Mohawkian Oxycone, with revision of the Older Barrandeocerida and Discussion of the Status of the Order; Journal of Paleontology V 58, no.6, pp1372–1379, Nov 1984
Furnish and Glenister 1964; Nautiloidea - Tarphycerida;K355 in the Treatise on Invertebrate Paleontology Vol K; Teichert and Moore, (eds) GSA and U of Kansas Press 1964
January 05, 2024
campbelloceras, this, article, includes, list, references, related, reading, external, links, sources, remain, unclear, because, lacks, inline, citations, please, help, improve, this, article, introducing, more, precise, citations, march, 2023, learn, when, re. This article includes a list of references related reading or external links but its sources remain unclear because it lacks inline citations Please help to improve this article by introducing more precise citations March 2023 Learn how and when to remove this template message Campbelloceras is a tarphyceratid nautiloid known from the Lower Ordovician Upper Canadian Epoch of North America where it is widespread Campbelloceras was named by Ulrich and Foerste in 1936 CampbellocerasTemporal range Lower Ordovician PreꞒ Ꞓ O S D C P T J K Pg NScientific classificationDomain EukaryotaKingdom AnimaliaPhylum MolluscaClass CephalopodaSubclass NautiloideaOrder TarphyceridaFamily TarphyceratidaeGenus CampbellocerasUlrich and Foerste 1936The shell of Campbelloceras has a circular whorl section only slightly impressed and a siphuncle that is close to the venter in all growth stages Campbelloceras differs from Tarphyceras in that the rate of expansion is greater the siphuncle is proportionally larger and an impression is shallower Campbelloceras may have given rise to the barrandeocerid Plectoceras Plectoceratidae through simplification of the connecting rings and to Tarphyceras through tighter coiling development of a deeper impression and reduction in the size of the siphuncle Campbelloceras may be conceivably derived from Estonioceras Estonioceratidae The cross section of Campbelloceras and that of the outer whorl of Estonioceras are similar except for Campbelloceras being slightly impressed Both have proportionally large siphuncles near the venter References editFlower R H 1984 Bodeiceras A New Mohawkian Oxycone with revision of the Older Barrandeocerida and Discussion of the Status of the Order Journal of Paleontology V 58 no 6 pp1372 1379 Nov 1984 Furnish and Glenister 1964 Nautiloidea Tarphycerida K355 in the Treatise on Invertebrate Paleontology Vol K Teichert and Moore eds GSA and U of Kansas Press 1964 Retrieved from https en wikipedia org w index php title Campbelloceras amp oldid 1145794914, wikipedia, wiki, book, books, library,
