Trans 1 Flashcards
General features of chordates
Notochord Dorsal hollow CNS Postnatal tail Endostyle Pharyngeal slits
Describing the devt (ontogeny) of animal embryos by providing a framework to research the relationships and patterns among the devt of diff classes of organisms
Baer’s law
All the other invertebrates in wc the ORAL END develops from the blastopore
Protostomes
All the other animals who developed an anal or cloacal opening from the blastopore
Deuterostomes
Phylum of the sea stars, sea urchins, brittle stars, sea cucumber
Echinoderms
Both have pharyngeal slits and invaginated dorsal nerve cord
Hemichordates and Chordates
Acorn worms
Hemichordata
Jawless organisms; most primitive vertebrates
Agnathans
With upper jaws and lower jaws
Gnasthostomes
Extinct jawless fish, have bony armor instead of scales
Ostracoderms
class of Fish with cartilaginous skeleton
Condrichtyes
subclass sharks, butanding
Elasmobranchii
Class of fish with bony skeleton
Osteichtyes
subclass of ray finned fish
Actinopterygians
Lobed finned fish; fins have muscle tissue and are more massive
Sarcopteridians
Have spiny fins, extinct
Acanthodians
REPTILES
have no temporal fossa
ex. turtles, chelonians
Anapsids
REPTILES
feature homoplasy (1 pair of temporal fossa)
ex. ichthyosaurus
Euryapsids
REPTILES
Ancestors of mammalian lineage
Synapsids
BIRDS
ancient birds that has a reptilian bone
Archaeornithes
MAMMALS
egg-laying mammals
Prototherians
MAMMALS
placental mammals
?- has yolk-sac placenta ex. marsupials
?- true placental mammal
Therians
Metatherians
Eutherians
classification of phenotypes
traits that are generalized, basic, ancestral, or primitive to a taxon
presence of a spinal column
Plesiomorphes
classification of phenotypes
traits that are modified, specialized, derived, and advanced for a member of taxon
presence of mammary glands
Apomorphies
