Aptychus

Some examples of aptychi (top right: Oppelia from Late Jurassic of Solnhofen, Germany; bottom left: aptychi (recto and versus) from Late Jurassic of Lombardy, Italy), and conceptual scheme of their function if indeed they were used to close the shell aperture, as opposed to being jaws.

One of what would have been a pair of aptychi (at first given the name Trigonellites latus and described as a bivalve) from the Kimmeridge Clay Formation in England

An aptychus is a type of marine fossil. It is a hard anatomical structure, a sort of curved shelly plate, now understood to be part of the body of an ammonite. Paired aptychi have, on rare occasions, been found at or within the aperture of ammonite shells. The aptychus was usually composed of calcite, whereas the ammonite shell was aragonite.

单词	aptychus
释义	aptychus 英汉-汉英词典口盖词组 \| 习惯用语您要查找的是不是： typhus n. [医]斑疹伤寒症网络短语: aptychus 无褶; 口盖; 复口盖; aptychus limestone 菊石口盖灰岩英语百科 Aptychus An aptychus is a type of marine fossil. It is a hard anatomical structure, a sort of curved shelly plate, now understood to be part of the body of an ammonite. Paired aptychi have, on rare occasions, been found at or within the aperture of ammonite shells. The aptychus was usually composed of calcite, whereas the ammonite shell was aragonite.
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aptychus

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Aptychus