BIOL 111 Lecture Notes - Lecture 17: Protostome, Deuterostome, Gastrulation
44
BIOL 111 Full Course Notes
Verified Note
44 documents
Document Summary
Protostomes and deuterostomes: protostomes and deuterostomes are the two evolutionary groups of bilateria (coincidentally also the triplosblasts) the split occurred around the cambrian period (about 500 mya) Digestive tract the protostomes and deuterostome have evolved a digestive tract o certain animals have lost the digestive tract after it was evolved (e. g. flatworms) advantages: o specialization of gut regions. Biol 111 organismal biology: different organs or sections of the digestive tract can perform highly specialized digestive functions o sequential food processing o continuous operation o some animals have fairly linear digestive tract (i. e. annelids and humans). Other animals (ruminants mostly herbivores) have a many-chambered stomach and regurgitate and re-digest food). Rodents eat their own feces to digest the broke down cellulose, which is only broken down after it has initially passed through the small intestine (coprophagy) How worms differ all worms are triploblastic and protostomes so how do they differ: we can primarily classify worms by their body cavities:
