Belemnoidea
箭石目
古生
belemnoidea[ noun ]
order of extinct dibranchiate cephalopods related to the surviving spirulas
<noun.animal>
Belemnoidea \Belemnoidea\ n.
an order of extinct dibranchiate cephalopods related to the
surviving spirulas.
Syn: order {Belemnoidea}.
[WordNet 1.5]