cyrtochoanitic造句

• Connecting rings are thin, septal necks cyrtochoanitic ( outwardly flared ).
• The siphuncle of " Oonoceras " is cyrtochoanitic.
• Septal necks are cyrtochoanitic, outwardly curved; connecting rings are thin.
• Septal necks are cyrtochoanitic, outwardly curved and recumbent.
• In form, cyrtochoanitic, necks recumbant.
• In contrast the later Pseudorthoceratidae, begin orthochoanitic with subcylindrical segments and ontogenetically become cyrtochoanitic with expanded segments.
• The siphuncle is cyrtochoanitic and empty, located between the center and venter; segments expanded slightly into the chambers.
• Siphuncle segments nummuloidal ( beaded in appearance ), septal necks cyrtochoanitic ( flared outwardly ) generally with recumbent ( bent back on themselves ) brims.
• The shell is elongate and slender, wider than high, with a subventral, empty, cyrtochoanitic siphuncle, with segments somewhat expanded into chambers but abruptly narrowed at septal openings.
• The Choanoceratidae is established for the derived Upper Silurian " Choanoceras ", characterized by septa that form deep symmetrical cones and a subcentral expanded siphuncle with cyrtochoanitic and recumbent septal necks at maturity.
• In both the septal necks are somewhat long and straight on the ventral side but in " Solenochilus " they are cyrtochoanitic and recumbent on the dorsal side, rather than simply curved back, cyrtochoanitic.
• In both the septal necks are somewhat long and straight on the ventral side but in " Solenochilus " they are cyrtochoanitic and recumbent on the dorsal side, rather than simply curved back, cyrtochoanitic.
• In primitive forms, the siphuncle in early growth stages is composed of tubular segments with almost straight suborthochoanitic septal necks, but becomes cyrtochoanitic with expanded segments in the later growth stages, and is expanded and cyrtochoanitic throughout in advanced forms.
• In primitive forms, the siphuncle in early growth stages is composed of tubular segments with almost straight suborthochoanitic septal necks, but becomes cyrtochoanitic with expanded segments in the later growth stages, and is expanded and cyrtochoanitic throughout in advanced forms.
• Later in the mature stages of early forms and throughout in the more advanced the connecting rings are inflated with cyrtochoanitic septal necks, giving what can be described as a " beaded " or " ellipsoidal " appearance ( Sweet, 1964 ).
• ""'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.
• ""'Allumettoceras " "', from the Middle and Upper Ordovician of North America and northern Europe, is similar to " Tripteroceras " except the siphuncle which starts off suborthochoanitic becomes cyrtochoanitic with subspherical segments in the later growth stages . " Allumettoceras " was named by Foerste in 1926
• The siphuncle, which is close to the venter, is cyrtochoanitic, empty, with expanded segments . " "'Oocerina " "'( K288 ), named by Foerste, 1926, is a slender, exogastric genus, like Oonoceras, from the Upper Silurian of Europe, Russia and possibly North America.