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单词 Paracrinoidea
释义

Paracrinoidea

中文百科

拟海百合

拟海百合(Paracrinoidea)是一类已灭绝的棘皮动物,生存于奥陶纪早期至志留纪早期。萼板(Thecal plate)排列略作两侧对称,有2到4个似海百合的腕(Arm),具有侧羽枝。种类不多,目前已知约有15属。

英语百科

Paracrinoidea 拟海百合

Paracrinoidea is an extinct class of Crinozoan echinoderms closely related to, and superficially resembling sea lilies. They lived in shallow seas during the Early Ordovician through the Early Silurian.

Paracrinoids are characterized by a mouth with two to five feeding arms arranged asymmetrically, or somewhat bisymmetrically. They have a U-shaped gut, and their anus is located next to the mouth. They have irregularly shaped bodies (theca), and a stem, similar to crinoids, and may have used the stem to attach themselves to a substrate, although some reconstructions show them partially buried in sediment.

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