|
''Bredyia'' is an ammonite genus from the lower part of the Middle Jurassic, found in Europe and North America. ''Bredyia'' is a member of the Hammatoceratidae, a family which comprises part of the Hildoceratoidea. Its shell is involute, strongly ribbed, with a small umbilicus. Whorls are strongly embracing; ribs thick, radially straight on the sides, curves forward on the venter but do not meet. The sides or flanks are outwardly bowed. The venter has a narrow keel and may be fastigate, like a gable roof. ==References== * W.J. Arkell, et al., 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology, Part L, Ammonoidea. Geological Society of America. *(Bredyia ) in Fossilworks Gateway *(Hammatoceratidae ) in Ammonites et Autres Spirales (Fr). 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Bredyia」の詳細全文を読む スポンサード リンク
|