Japan\'s Tetragonites popetensis C210c
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Japan\'s Tetragonites popetensis C210c:
$17.50
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Size: As shown in pictures
Age: Cretaceous (about70 million years ago)
Locatin: Hokkaido,Japan
Description:
Tetragonitidaeis a family of Cretaceous lytoceratin ammonites typicallywith square or trapezoidal whorl section at least during some growth stage.Members of this family are usually smooth but some lirate or striate, oftenwith constrictions. Other features include suture with a varying number ofauxiliary saddles, and an internal suture with two or more. Major saddles areirregularly trifid. The family is derived from the genus Eotetragonites in thefamily Gaudryceratidae.