n.[古生物]菊石（已滅絕的頭足動物）

The Cenozoic faunas often superficially resembled those of the Mesozoic. However, there were no ammonoid cepbalopods in this most recent era. 新生代的動物群表面上類似于中生代的動物群，但新生代沒有菊石頭足綱動物

EARLY TRIASSIC AMMONOID SUCCESSION IN CHAOHU, ANHUI PROVINCE 安徽巢湖地區(qū)早三疊世菊石序列

CARBONIFEROUS AMMONOID ZONES FROM ZHONGNING AND ZHONGWEI, NINGXIA REGION, CHINA 寧夏衛(wèi)寧地區(qū)石炭紀菊石帶

NEW PROGRESS IN THE STUDY ON PERMIAN AMMONOID BIOSTRATIGRAPHY IN GUANGXI 廣西二疊紀菊石生物地層學研究新進展

ammonoid fossil 菊石化石