cyrtocone造句

• The shell is a compressed, exogastric cyrtocone, section sub ovoid.
• The shell of " Gaspocyrtoceras " is a coarsely annularted exogastric cyrtocone.
• The juvenile portion of an ascocerid consists typically of a narrow, circular cyrtocone that underwent periodic truncation.
• The shell of " Baeopleuroceras " is a short, rapidly expanding cyrtocone, curved through at least 90 degrees.
• The shell, or conch, of " Calocyrtoceras " is generally characteristic of its family, the Paraphragmitidae, an anulated cyrtocone.
• The ascocerid shell, or conch, is the thinnest and most fragile of any orthocone or cyrtocone of comparable size ., which accounts for their rarity.
• The shell is a longiconic cyrtocone, like that of " Jovellania " or " Mixosiphonoceras ", except for being compressed rather than depressed.
• The shell, or conch, of " Cyrtocycloceras " is a moderately expanding annulated exogastric cyrtocone, with curvature like that of a rocking chair rocker.
• The Dakeoceras shell is an endogastric cyrtocone with the siphuncle on the concave, ventral, side; moderately curved and expanded in the juvenile stages which become reduced in the adult.
• 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.
• 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.
• The shell of " Macrodomoceras " is a compressed, endogastric cyrtocone, i . e section higher than wide and curved with the ventral side concave, with a subtriangular cross section.
• ""'Fayettoceras " "'is a genus in the nautiloid family Valcouroceratidae, part of the order Oncocerida, " Fayettoceras " has a shell which is a depressed cyrtocone with a ventral cyrtochoanitic siphuncle of elongated ovoid segments strongly contracted at the septal necks.
• ""'Leonardoceras " "'is a nautiloid cephalopod from the lower Middle Ordovician of Nevada ( USA ), the shell a small slender exogastric cyrtocone with the venter more narrowly rounded than the dorsum, resembling in overall form a small " Bassleroceras ".
• The earliest described, assigned to the Ellesmeroceratidae, is the early Trempealeauan " Hunuanoceras ", which comes from the lower part of the upper Yenchou Member of the Fengshan Formation in China . " Hunuanoceras " is a small endogastric cyrtocone resembling the ascestral " Plectronoceras " except for having resistant calcified connecting rings.