crinoid造句
1. The slender stems, like those of the crinoids are not preserved here.
2. The crinoids and the belemnites and the corals behaved similarly.
3. There are numerous Carboniferous crinoids not unlike this one, which require expert knowledge in their discrimination.
4. Crinoids are brought up in trawls from the deep sea several thousand at a time.
5. The long and varied history of the crinoids demonstrates how well the echinoderms have attacked the problems of filter-feeding.
6. Gahn and Baumiller examined more than2, 500 crinoid fossils for evidence of arm regeneration, focusing onspecimens dating back 290 million to 490 million years.
7. Recently a rich and well preserved crinoid community has been found in the Late Triassic Wayao Formation in Guanling County, Guizhou Province, China.
8. Marine reptiles and echinoderm crinoid that feature intact and delicate preservation and large quantity serve as the mark.
9. In 1992 , the author found fossil crinoid stems in crystalline limestone at Xia-zhuang, Wenchuan, which were determined to be of Ordovician age.