exogastric वाक्य
उदाहरण वाक्य
मोबाइल
- Cameral depostis are well developed on the convex side, toward the apex while only thin on the concave side, making the curvature exogastric.
- Plectronoceratoids are generally small to tiny forms with orthoconic or endogastric shells, a few being exogastric, with proportionally large ventral siphuncles that contain numerous diaphragms.
- Late Cambrian " Huaiheceras " ( Hauiheceratidae ) is also similar in being long with a small marginal siphuncle, but is exogastric and less strongly curved.
- The shell, or conch, of " Cyrtocycloceras " is a moderately expanding annulated exogastric cyrtocone, with curvature like that of a rocking chair rocker.
- Protocycloceratidae, named by Kobayashi ( 1935 ), are characterized by transversely ribbed, elongate shells that may be straight or slightly curved, as to be either endogastric or exogastric.
- The shell of " Teichertoceras " is moderately compressed; the early portion a narrow expanding cyrtocone that in the adult become more swollen, taking on an exogastric aspect.
- ""'Pentameroceras " "'is a straight to slightly exogastric breviconic oncocerid from the middle Silurian of North America and Europe belonging to the Trimeroceratidae.
- The second, formed by the Westonoceratidae, Lowoceratidae, and Discosoridae, are fundamentally exogastric with the siphuncle near the outside or longituninally convex curvature, although the Discosoridae are somewhat different.
- This cephalopod produced a straight to slightly exogastric shell with a variable cross section that is generally circular, in which septa are close spaced and transverse, the body chamber is inflated.
- ""'Mecynoceras " "'is a Late Devonian oncocerid included in the Poterioceratidae, a family of subcircular to compressed exogastric cyrtocones without a hyponomic sinus.
- Both are strongly curved with a notable rate of expansion; ventral sides, as with the previous genera, are on the outside, convex curvature, making them, again, exogastric.
- The shell of " Simardoceras " is a moderately expanding exogastric cyrtocone, said to resemble a rather large " Oncoceras ", but with a siphuncle that is definitely discosorid.
- ""'Conostichoceras " "'is an exogastric, breviconic oncocerid included in the family Nothoceratidae, known from the Middle Devonian of central Europe and Upper Devonian of Australia.
- ""'Bassleroceras " "'is an elongate upwardly curved, exogastric, genus with the venter on the under side more sharply rounded than the dorsum on the upper.
- ""'Cyrtonybyoceras " "'is a genus of slightly exogastric members of the Wutinoceratidae, a family of actinocerids and probably derived from an earlier " Wutinoceras ".
- Shells are rather small, reaching lengths of about 12-15 cm ( 5-6 in ); elongate with an upward, exogastric, curvature-like a rocker-and subcircular to laterally compressed cross section.
- "Blakeoceras " is an early nothoceratid possibly derived from " Perimecoceras " which has its origin in the Oncoceratidae, and is the likely source for the other exogastric nothoceratids with more greatly expanded shells.
- ""'Tripteroceras " "', the type genus, named by Hyatt ( 1884 ) is characterized by a small, straight or slightly exogastric shell with a broad, depressed triangular cross section.
- The shell of " Blakeoceras " is moderately curved ( cyrtoconic ) with the ventral side on the outer curvature ( exogastric ) Chambers in the phragmocone are short and wide, separated by straight, close spaced septa.
- Oncoceratidae are characterized by generally compressed, cyrtoconic, and breviconic shells with an exogastric curvature such that the ventral profile is convex or more so than dorsal, and in which the siphuncle is generally empty and located ventral of the center.
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