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(有(yǒu )孔(kǒng )虫(chóng )，有(yǒu )孔(kǒng )虫(chóng ))

单(dān )细(xì )胞(bāo )动(dòng )物(wù )。有(yǒu )石(shí )灰(huī )质(zhì )壳(ké )，壳(ké )上(shàng )多(duō )小(xiǎo )孔(kǒng )，由(yóu )此(cǐ )溢(yì )出(chū )许(xǔ )多(duō )丝(sī )状(zhuàng )的(de )假(jiǎ )足(zú )。生(shēng )活(huó )在(zài )海(hǎi )洋(yáng )中(zhōng )，遗(yí )壳(ké )堆(duī )积(jī )海(hǎi )底(dǐ )，形(xíng )成(chéng )岩(yán )石(shí )。有(yǒu )孔(kǒng )虫(chóng )化(huà )石(shí )可(kě )用(yòng )来(lái )测(cè )定(dìng )岩(yán )石(shí )的(de )地(dì )质(zhì )年(nián )龄(líng )。

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●有孔虫（简体版）