Nephriticeratidae

	Nephriticeratidae The Nephriticeratidae is a family of early Paleozoic (''E-M Dev'') nautilod cephalopods included in the Barrandeocerina The Barrandeocerina comprise a suborder of Early Paleozoic nautiloid cephalopods, primitively coiled but later forms may be cyrtoconic, gyroconic, torticonic, and even breviconic, all having empty siphuncles with thin connecting rings. The Bar ... (a suborder of tarphycerids ''sensu lato''), distinguished by mostly cyrtoconic as well as gyroconic, sepenticontic, and sinstrally torticonic shells with large, typically straight necked (orthchoanitic) siphuncles. As for the suborder, connecting rings are thin. Derivation The earliest genus included in the Nephriticeraatidae is the sinistrally torticconic '' Sphyradoceras'', which comes from the Lower Devonian Schoharie Formation of New York. It is in fact the only torticonic genus in the family and the only genus known from the Barrandeocerina from the Lower Devonian. The early stage of ''Sphyradoceras'' is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Baeopleuroceras ''Baeopleuroceras'' is a genus included in the Barrandeoceroid family Nephriticeratidae, found in Middle Devonian sediments in eastern North America (NY, Penn, Ont.) The shell of ''Baeopleuroceras'' is a short, rapidly expanding cyrtocone, curved through at least 90 degrees. The body chamber is one half the overall shell length. The siphuncle is subcentral with segments slightly expanded into the chambers. '' Rhadinoceras'' and '' Nephriticeras'' are somewhat similar genera from within the Nephriticeratidae, except that in both the siphuncle The siphuncle is a strand of tissue passing longitudinally through the shell of a cephalopod mollusk. Only cephalopods with chambered shells have siphuncles, such as the extinct ammonites and belemnites, and the living nautiluses, cuttlefish, and ... is displaced between the center and the dorsum. References * Walter C. Sweet, 1974. Nautiloidea-Barrandeocerida. Treatise on Invertebrate Paleontology Part K Mollusca 3. Geological Societ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Barrandeocerina The Barrandeocerina comprise a suborder of Early Paleozoic nautiloid cephalopods, primitively coiled but later forms may be cyrtoconic, gyroconic, torticonic, and even breviconic, all having empty siphuncles with thin connecting rings. The Barrandeocerina were originally defined as a separate order by Rousseau Flower (Flower and Kummel, 1950), but since then have been united within the Tarphycerida as a suborder (Teichert 1988). Derivation is from the Tarphyceratidae. In early forms the siphuncle is central or subcentral, orthochoanitic (septal necks short and straight), and thin, with tubular segments. Later forms include those with cyrtochoanitic septal necks (curved outward) and segments that may be slightly to strongly expanded into the chambers. Taxonomy Six families are included in the Barrandeocerina, (ex Barrandeocerida). :Barrandeoceratidae M Ord-M Dev : Plectoceratidae M-U Ord : Apsidoceratidae M-U Ord :Uranoceratidae U Ord-M Sil :Lechritrochoceratidae M-U Sil : ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Tarphycerida The Tarphycerida were the first of the coiled cephalopods, found in marine sediments from the Lower Ordovician (middle and upper Canad) to the Middle Devonian. Some, such as ''Aphetoceras'' and ''Estonioceras'', are loosely coiled and gyroconic; others, such as ''Campbelloceras'', ''Tarphyceras'', and ''Trocholites'', are tightly coiled, but evolute with all whorls showing. The body chamber of tarphycerids is typically long and tubular,Furnish and Glenister 1964; Nautiloidea - Tarphycerida; In the ''Treatise on Invertebrate Paleontology'' Vol K; Teichert and Moore, (eds) GSA and U of Kansas Press 1964 as much as half the length of the containing whorl in most, greater than in the Silurian Ophidioceratidae. The Tarphycerida evolved from the elongated, compressed, exogastric Bassleroceratidae, probably '' Bassleroceras'', around the end of the Gasconadian through forms like ''Aphetoceras''. Close coiling developed rather quickly, and both gyroconic and evolute forms are found i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Barrandeoceratidae The Barrandeoceratidae is a family of coiled nautiloids included in the Tarphycerida (''sensu lato'') that lived from the Middle Ordovician to the Middle Devonian, characterised by mostly compressed shells with a subcentral siphuncle composed of thin-walled segments that may become secondarily ventral.(Flower and Kummel 1950, Sweet 1964). The Barrandeoceratidae are derived from the tarphyceratid genus, ''Centrotarphyceras'' through '' Barrandeoceras'' (Flower 1984), and is the source for the Uranoceratidae and Nephriticeratidae. These three families form the barrandeoceratid group. Sometimes a fourth family, the Bickmoritidae, is added, based on the genus ''Bickmorites''. Genera (Flower 1984) include '' Barrandeoceras'', '' Centrocyrtoceras'', '' Paquettoceras'', ''Savageoceras'', ''Gasconsoceras'', '' Haydenoceras'', and '' Paraplectoceras''; and if included, '' Bickmorites''. '' Avilionella'' and '' Laureloceras'', included in the Barrandeocerida in the ''Treatise on Inverte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Devonian The Devonian ( ) is a geologic period and system of the Paleozoic era, spanning 60.3 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya. It is named after Devon, England, where rocks from this period were first studied. The first significant adaptive radiation of life on dry land occurred during the Devonian. Free-sporing vascular plants began to spread across dry land, forming extensive forests which covered the continents. By the middle of the Devonian, several groups of plants had evolved leaves and true roots, and by the end of the period the first seed-bearing plants appeared. The arthropod groups of myriapods, arachnids and hexapods also became well-established early in this period, after starting their expansion to land at least from the Ordovician period. Fish reached substantial diversity during this time, leading the Devonian to often be dubbed the Age of Fishes. The placoderms began domina ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]