Modern sinistral whelk spire angles, genus Busycon

Spire angle data for sinistral whelks of the family Busyconidae. Data focuses on spire angles, with some data on total shell length. Locality information is present for all modern specimens.盔螺科（Busyconidae）左旋峨螺（sinistral whelks）的螺塔角（Spire angle）相关数据。本数据集以螺塔角为核心观测内容，同时附带部分壳体总长度的测量数据。所有现生标本均标注有完整的采集地信息。