出典:Wikipedia
出典:『Wikipedia』 (2011/01/24 14:18 UTC 版)
Holconautilus is a Nautiloid genus from the family Tainoceratidae and order Nautilida, named by Mojsisovics, 1902, and known from Upper Triassic sediments in Europe and E Indies (Timor). Its shell, evolute, discoidal, with simple coarse lateral ribbing; whorl section, subrectagular with a broadly arched venter.