01:119:116 Lecture Notes - Lecture 7: Echinoderm, Chordate, Unikont
Document Summary
Lecture 7 - unikonta iv: deuterostome clade, shared derived traits. Shares a single ancestor that had deuterostome development. Echinodermata is the sister to phylum chordata: phylum chordata, shared derived traits. Suspension feeders - feed like a sponge. Backbone composed of vertebra - replaces notochord. Two or more clusters of hox genes: basal vertebrates. Basal clade is the chondrichthyes (cartilage fish) Sharks , rays and skates: osteichthyans (bony fish) Calcium phosphate - bones: lobe fins. Lobe fins - muscular limbs - for locomotion. Lungfish (dipnoi) have lungs and gills: tetrapods. Amnion - keeps the baby wet inside the egg (amniotic sac) Evolved from synapsids: human evolution, derived traits of mammals. 3 groups of mammals: mammal phylogeny. Marsupials - nipples, lives young, placenta but they have pouches. Eutherians - most mammals, nipples, live young, placenta, in-utero development: derived traits of primates. Opposable thumbs: recent human evolutionary history.