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来自维基百科,自由的百科全书
準雙分貝屬(學名:Meristina),又名準雙弓貝屬,是小雙分貝科小雙分貝亞科下已滅絕的一個屬,生存於晚奧陶紀至中泥盆紀,其化石分布於亞洲、歐洲和北美洲,多聚集出現在顆粒很細的泥質石灰岩層中,故牠們可能生活在淺海區域。[1]
體型相對較大,殼形從三角形至圓形都有,且長度都要大於寬度。背殼上有寬而淺的摺皺,而腹殼上則有相對應的溝槽。兩殼的頂部向內大幅度凹陷、彎曲,將肉莖孔的大部分掩蓋住了。兩殼上均無飾紋。[1]
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