However , other scientists are not convinced these Early Cambrian fossils show clear signs of the torsion that identifies modern gastropods twists the internal organs so the anus lies above the head .
Some analyses of helcionellids concluded these were the earliest gastropods .
Other scientists are not convinced these Early Cambrian fossils show clear signs of the torsion that identifies modern gastropods twists the internal organs so the anus lies above the head .
Some analyses of helcionellids concluded these were the earliest gastropods .