WebPikaia fossils were recovered from the Burgess shales of Canada and dated to the middle of the Cambrian age, making them more than 500 million years old. ... This hypothesis is further supported by the discovery of a fossil in China from the genus Haikouella. This organism seems to be an intermediate form between cephalochordates and vertebrates. WebThis study investigates whether the recently described Cambrian fossil Haikouella (and the very similar Yunnanozoon) throws light on the longstanding problem of the origin of craniates. In the first rigorous cladistic analysis of the relations of this animal, we took 40 anatomical characters from Haikouella and other taxa (hemichordates ...
Haikouella lanceolata Fossils
WebThere is disagreement over whether older animals—such as Yunnanozoon lividum and Haikouella (both of which date to 530 million years ago and possess several chordate features)—should be considered chordates. An extensive vertebrate fossil record begins about 400 million years ago. WebThe Haikouella fossils are about 530 million years old and appear similar to modern lancelets. These organisms had a brain and eyes, as do vertebrates, but lack the skull found in craniates. [1] This evidence suggests that vertebrates arose during the Cambrian explosion. Recall that the “Cambrian explosion” is the name given to a relatively ... department of national park and wildlife
Haikouella - Wikipedia
Haikouella is an agnathan chordate from the Lower Cambrian Maotianshan Shales of Chengjiang County in Yunnan Province, China. An analysis in 2015 placed Haikouella as a junior synonym of Yunnanozoon, another Maotianshan shale Cambrian chordate. It is similar to the form Yunnanozoon, which is possibly a hemichordate. Still, t… WebDec 19, 2024 · Media in category "Haikouella" The following 5 files are in this category, out of 5 total. Haikouella lanceolata China.jpg. Haikouella lanceolata Muséum Grenoble 03082024.jpg. Haikouella lanceolata, Chlupáč Museum, Prague.jpg 1,688 × 1,299; 970 KB. Haikouella lanceolata.jpg 600 × 308; 93 KB. department of motor vehicles whittier ca