They were the first coleoids Like Sphooceras millions of years before them, coleoids wrapped their soft mantles around their hard shells.

它们是最早的鞘状体， 就像数百万年前的 Sphooceras 一样，鞘状体将柔软的外套膜包裹在坚硬的外壳上。

Sphooceras periodically wrapped part of its soft mantle around the outside of its shell, and then secreted enzymes that helped break off the chambers at the end.

Sphooceras 定期将其柔软的外套膜的一部分包裹在壳的外部，然后分泌有助于在末端打破腔室的酶。