Parent Group

Chordata (“Chordates”)

Sister Groups

Tunicata (“Urochordates”)
Cephalochordata (“Lancelets”)

Daughter Groups

Gnathostomata (“Jawed Fish”)
Agnatha (“Jawless Fish”)

Articles

Evolution: Reptiles to Mammals
The evolutionary transition from synapsid reptiles to mammals.

Convergence or Introgression?
Could the mosaic of characteristics seen in fossil and extant hominids be evidence of past hybridization?

“Through a Glass, Darkly”
Dinosaurian hominids.

Subsections

The Hominid Homepage
For all your filthy monkey-man needs.

Lists

Fossil Hominid Specimens

D. Jon Scott’s Website ► Science ► Physics ► Chemistry ► Biology ► Eukaryology ► Zoology ► Ichthyology

Introduction

Paragraph

Classes

Class Agnatha (“jawless fish”)
Class Chondrichthyes (“cartilaginous fish”)
Class Osteichthyes (“bony fishes”)
Class Amphibia (“amphibians”)
Class Reptilia (“reptiles”)
Class Aves (“birds”)
Class Mammalia (“mammals”)

Subphylum Vertebrata
Palaeospondylus
Superclass Agnatha or Cephalaspidomorphi (“jawless fish”)
Infraphylum Gnathostomata (“Jawed Fish”)
Class Placodermi (“armored fishes”)
Class Chondrichthyes (“cartilaginous fishes”)
Class Acanthodii (“spiny sharks”)
Superclass Osteichthyes (“bony vertebrates”)
Class Actinopterygii (“ray-finned fish”)
Class Sarcopterygii (“lobe-finned fish”)
Class Amphibia (“amphibians”)
Class Synapsida (“mammals”)
Class Sauropsida (“reptiles”)

Infraphyla

Infraphylum Gnathostomata (“Jawed Fish”)
Class Placodermi (“armored fishes”)
Class Chondrichthyes (“cartilaginous fishes”)
Class Acanthodii (“spiny sharks”)
Superclass Osteichthyes (“bony vertebrates”)
Class Actinopterygii (“ray-finned fish”)
Class Sarcopterygii (“lobe-finned fish”)
Class Amphibia (“amphibians”)
Class Synapsida (“mammals”)
Class Sauropsida (“reptiles”)

Superclasses

Superclass Agnatha or Cephalaspidomorphi (“jawless fish”)
Infraphylum Gnathostomata (“Jawed Fish”)
Class Placodermi (“armored fishes”)
Class Chondrichthyes (“cartilaginous fishes”)
Class Acanthodii (“spiny sharks”)
Superclass Osteichthyes (“bony vertebrates”)
Class Actinopterygii (“ray-finned fish”)
Class Sarcopterygii (“lobe-finned fish”)
Class Amphibia (“amphibians”)
Class Synapsida (“mammals” and their ancestors)
Class Sauropsida (“reptiles”, including birds)