actinomorpha中文什么意思

星形角石属

百科释义

Actinomorpha is a valcouroceratid genus, Order Oncocerida, from the Middle Ordovician of central North America (Minnesota, Wisconsin), named by Rousseau Flower, 1943. The shell is a compressed brevicone with the venter more narrowly rounded than the dorsum, having the effect of a modest keel in horizontal orientation.