exogastric वाक्य
उदाहरण वाक्य
मोबाइल
- Ascoceratinae have an exogastric ascoceroid stage characterized by the development of a protruding neck ending at the aperture, both ocular and hyponomic sinuses which form when fully grown, and camerae that are mostly confined to the dorsal half of the shell.
- ""'Aktjubocheilus " "'is an oncocerid Nautiloidea genus from the Upper Devonian ( M Famenian ) included in the Acleistoceratidae, a family characterized by depressed, or rarely compressed, exogastric brevicones and cyrtocones.
- A number of terms are used to describe molluscan shell shape; in the univalved molluscs, endogastric shells coil backwards ( away from the head ), whereas exogastric shells coil forwards; the equivalent terms in bivalved molluscs are opisthogyrate and prosogyrate respectively.
- Known for sure dorsal siphuncles don't appear until later in the Early Ordovician with the Trocholitidae, which if so would make it ( " Eburoceras " ) exogastric . " Eburoceras " is the most strongly curved of the Cambrian ellesmeroceratids.
- "Discosorus " is found in the Middle Silurian of eastern and arctic North America and as part of the Discosoratidae is derived from the Lowoceratidae which forms a link in the Early Silurian from the Late Ordovician exogastric " Faberoceras " of the Westonoceratidae.
- The "'Brevicoceratidae "', named by Flower in 1941, is a family of oncocerids that contains genera characterized by exogastric ( or rarely endogastric ) gyrocones, brevicones, and torticones . that tend to develop vestigial actinosiphonate deposits and subtriangular transverse sections.
- ""'Ovocerina " "'is a small breviconic mandaloceratid with an exogastric aspect produced by the more convenxly rounded lower ( ventral ) side and a rounded or transversely extended aperture that approaches the T-shaped aperture of " Mandaloceras ".
- "' Mandaloceratidae "'is a family in the nautiloid cephalopod order Discosorida, from the Middle and Upper ( ? ) Silurian characterized by short, essentially straight shells referred to as breviconic, typically with a faintly exogastric shape produced by the profile of the body chamber.
- "' Bathmoceratidae "'is a family of nautiloids containing rather large straight or faintly exogastric ( upwardly curved ) shells and rather large ventral siphuncles with long septal necks and connecting rings that thicken inwardly into lobes that extend forward for the length of two or three chambers.
- The "'Acleistoceratidae "', named by Flower in Flower & K�mmel 1950, is a family of oncocerids that contains genera characterized by depressed ( or rarely compressed ) exogastric brevicones and cyrtocones ( Sweet, 1964 K398 ) that range from the Middle Silurian to the Middle Devonian.
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