Discovery of the proboscis on tylotites petiolaris - 西北地质.PDF

36 1 V ol. 36No . 1 2003 ( 144 ) NORT HW EST ERN GEOLOGY 2003 ( Sum 144) : 1009-6248 ( 2003) 01-0087-07 Discovery of the proboscis on ty lotites p etiolaris , - - HA N ian ZHA N G Zhi fei and SHU De g an ( , , ′ 710069, ) Dep artment of Geology and Early Lif e Institute Northwest University Xi an China : Abstract T he Low er Cambrian Chengjiang Lag er st atte provides a w onderful window to ex plor e the ear - ly r adiatio ns of int roverta. Intr ov erta of t he Chengj iang fauna co nstitutes an important component of contempor ary benthic co mmunities. Tylotites petiolaris Luo et Hu 1999 w as prev iously assigned t o lobopods. N ew m aterial fr om another sectio n w ith probo scis preserved co nfirms that it is an early intro - . . . verta Detailed descript ion of T petiolaris is made and a new family T y lotit idae is er ected her ein T he lo ng trunk spines of the animal indicate that T.p etiolaris is an epifauna . Key words: intr ov ert a, Early Cambrian, probo scis, Chengjiang fauna. INTRODUCTION Since the discovery of the Chengjiang fauna, portant component of the co mmunities. Of