出典:Wikipedia
出典:『Wikipedia』 (2011/01/24 14:35 UTC 版)
Thuringionautilus is a large, moderately involute, nautiloid from the nautilid family Tainoceratidae. The whorl section is subquadrate, flanks slightly convex, venter broad with a median furrow. Ventral shoulders, narrowly rounded to subangular; umbilical shoulders, broadly rounded. Longitudinal nodes slope diagonally backwards on the venter toward the furrow. Suture, slightly sinuous. Siphuncle, subdorsal.