腹菊石（學名：Gastrioceras），又名腹稜角石，是生存在晚石炭紀至晚二疊紀海洋中的一屬菊石。牠們的游水能力很差。[2]
特徵
腹菊石的外殼內旋，有寬闊而深的核心。旋環緊密地擠壓在一起，並有寬闊、略圓的腹。殼體側面的結節組成了橫貫腹部的肋條。縫合線為許多線條分明的褶皺，褶皺的前部是圓的，後部則是尖的。[2]
物種[1]
- Gastrioceras (Lissogastrioceras)
- Gastrioceras formosum
- Gastrioceras glenisteri
- Gastrioceras liratum
- Gastrioceras listeri
- Gastrioceras magoffinense
- Gastrioceras melvillensis
- Gastrioceras montgomeryense
- Gastrioceras noduliferum
- Gastrioceras occidentale
- Gastrioceras planorbiformis
- Gastrioceras prone
- Gastrioceras retiferum
- Gastrioceras richthofeni
- Gastrioceras williamsi
參考文獻
外部連結
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