1815 Burrow Conchol. 37Retuso-umbilicate; the spire being so much impressed as to seem rather concave than convex. 
1856–8 W. Clark Van der Hoeven'sZool. I. 790Shell univalve, covering body entirely above, clypeate or retuso-conical. 
| 词汇 | retuso- | 
| 词根词缀 | OED 
 
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