| 词条 | Ussurites |
| 释义 |
| fossil_range = {{fossil range|245|237}} | image = | taxon = Ussurites | authority = Hyatt, 1900 }} Ussurites is an extinct ammonoid cephalopod genus belonging to the suborder Phylloceratina and is included in the family Ussuritidae. Its range is restricted to the early Middle Triassic, (Anisian) As with the family, the shell of Ussurites is discoidal, evolute, and generally smooth. The suture is phylletic with divided lobes and simple, rounded, elongate saddles. The ventral lobe is bifurcated, the two branches sharply serrated. The two lateral lobes are asymmetrically trifurcated, sections sharply pointed. The first lateral saddle (closest to the venter) is fairly evenly rounded, the second and third are narrower and asymmetric, leaning away from the venter and toward the umbilicus. Monophyllites, which extends through the Middle Triassic into the Carnian is similar, differing in the details of the suture. References
4 : Triassic ammonites|Ammonitida|Fossils of Svalbard|Anisian life |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。