7/24/2019 ampioxus

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•   Notochord: dorsal bar placed under the nervous system with a

skeletal function.

•   Epineuria: dorsal position of nerve cord.

•   Endostyle: ventral groove in the pharynx that produce mucus to

catch food and also produce iodized compounds. This gives thyroid.

•   Caudal fn: locomotive appendix.

General anatomy of a cephalochordate. 1. brain-like blister 2. notochord 3. dorsal nerve cord 4. post-anal tail 5.

anus 6. food canal 7. blood system . abdominal porus !. overpharyn" lacuna 1#. $ill%s slit 11. pharyn" 12. mouth

lacuna 13. mimosa 14. mouth $ap 15. $onads &ovary'testicle( 16. li$ht sensor 17. nerves 1. abdominal ply 1!.

hepatic caecum 2#. s)im bladder 21. lateral line &*mat$e+ ,iotr icha /a)orski 0 reative ommons(

 Amphioxus lives buried in sand seafloor of the shallow and coastal waters and in

estuaries all over the world.