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protoconch

A protoconch (meaning first or earliest or original shell) is an embryonic or larval shell which occurs in some classes of molluscs, e.g.

1、[无脊椎]胎壳

... 胎管剑盘nsicula 胎壳 protoconch 苔藓虫门 Bryozoa ...

2、[无脊椎]原壳

... 原节肢动物 protoarthropodan 原壳 protoconch 原口部 Protostomia ...

3、初房

... 胎盘；胎座 placenta 胎壳；初房 protoconch 胎生 viviparity ...

生物学

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