The
scheme below uses both the old Linnaeus classification system,
as well as some of the more modern phylogenic conventions,
including the three domains of life. It is merely intended
as a ontology
(i.e.,
road map) to use to link to information and pictures of various
categories of fossils. For sure, as genomes, proteomes and
gene
function of extant organisms are studied, there will be surprises
and scientific debate, and branching points in the Great
Tree
of Life will likely change.
Linnaeus
Classification Scheme:
Kingdom - e.g.
animalia Phylum -
chordata Class - mammalia Order -
primate Family -
hominidae Genus - homo species -
sapiens
|
A
Pseudo Tree of Life for Fossil Collectors: |
|
Domain
Bacteria or Eubacteria ("True bacteria",
mitochondria, and chloroplasts) |
|
Domain
Archaea
(Methanogens, Halophiles, Sulfolobus, and relatives) |
|
Domain
Eukaryota or the Eukaryotes
(Protists, Plants,
Fungi, Animals, Algae, etc.) |
|
Kingdom
Protista (single-celled animals, microorganisms) |
|
Kingdom
Chromista - usually grouped with Protista
(single-celled plant and plant-like organisms
that include all algae
whose chloroplasts contain chlorophylls a and c) |
|
Division
Bryophyta (mosses) |
|
Division
Lycophyta (scale trees, club moss) |
|
Division
Pteridopsida (ferns) |
|
Division
Spermatophytes (seed plants) |
|
Kingdom
Animalia (Metazoa) |
|
Worms A
worm in common vernacular is an elongated invertebrate,
typically lacking legs. I list them here to demonstrate
the enormous diversity including dispersion across
10 phyla among the 35 known phyla in the tree of
life. Worms are important in evolution and the
fossil record, though fossils are relatively rare
due to the need for preserving soft tissues. |
|
Phylum Annelida (earthworms and leeches) |
|
Phylum Chaetognatha |
|
Phylum Hemichordata |
|
Phylum Nematoda (round worms) |
|
Phylum Nemertea (ribbon worms) |
|
Phylum Onychophora (velvet worms within Superphylum:
Ecdysozoa) |
|
Phylum Phoronida (horsehair worms - no uncontested
body fossils, only ichnofossils |
|
Phylum Platyhelminthes (flatworms) |
|
Phylum Priapulida (penis worms) |
|
Phylum Sipuncula |
|
Phylum
Porifera (sponges) |
|
Phylum
Cnidaria |
|
Class
Anthozoa (corals, anemones) |
|
Class
Cubozoa (box jellyfish) |
|
Class
Scyphozoa (jellyfish |
|
Phylum
Arthropoda (Ecdysozoa
- molting animals) |
|
Class
crustacea (crabs, lobster,
shrimp) |
|
Class
Myriapoda (millipedes, centipedes) |
|
Class
Cheliceramorpha (spiders) |
|
Class Arachnida
(spiders, mites, ticks, scorpions, pseudoscorpions) |
|
Order
Eurypterida or Eurypterids (sea scorpions) |
|
Class Merostomata (horseshoe crabs) |
|
Phylum
Bryozoa (moss animals) |
|
Phylum
Mollusca |
|
Class Aplacophora |
|
Class Bivalvia (the bivalves - clams, mussels, oysters,
scallops - many orders) |
|
Class Cephalopoda
(squid, octopus, ammonites) |
|
|
Subclass Ammonoidea (the extinct ammonites) |
|
|
Subclass Nautiloidea (the extant Nautiloids ) |
|
|
Subclass Coleoidea (belemnoids, octopuses, squids,
cuttlefish) |
|
Class Gastropoda (snails and slugs) |
|
Class Monoplacophora (polyphyletic group) |
|
Class Pleistomollusca (class proposed in Nature.
2011 Sep 4;477(7365):452-6) |
|
Class Polyplacophora (chiton) |
|
Class Rostroconchia (once placed in bivalvia) |
|
Class Scaphopoda (tusk shells) |
|
Subphylum Blastozoa (blastoids) |
|
Subphylum Crinozoa |
|
|
Class
Crinoidea (the crinoids or sea lillies) |
|
|
Class Paracrinoidea (resemble crinoids) |
|
|
Class
Echinoidea (sea urchins, sand dollars) |
|
|
Class
Edioasteroidea (like starfish) |
|
|
Class
Eocrinoidea (dawn crinoids) |
|
Subphylum Homalozoa (limited to Paleozoic, some
fossils enigmatic and equivocal affinity - e.g.,
carpoids) |
|
Subphylum: Asterozoa |
|
|
Class
Ateroidea (starfish or sea stars) |
|
|
Class
Ophiuroidea (brittle stars) |
|
Subphylum
Tunicata, including Urochordata |
|
Fish (an
enormous but paraphyletic group listed below) |
|
Superclass
Agnatha (the agnathans - the jawless fish of the Paleozoic) |
|
Infraphylum
Gnathostomata (jawed vertebrates) |
|
Class
Placodermi (the Armored fish) |
|
Class
Acanthodii (spiny sharks of Paleozoic) |
|
Superclass
Osteichthyes (bony fish) |
|
Class
Chondrichthyes (the cartilaginous fishes, including
sharks, rays and skates) |
|
Class
Actinopterygii (the ray finned fishes) |
|
Class
Sarcopterygii (lobe-finned fishes) giving rise
to Clade: Tetrapodomorpha |
|
Superclass Tetrapoda (with four legs
or e.g., two legs and two wings) |
|
Class
Amphibia (Amphibians) |
|
Class
Reptilia (Reptiles) |
|
Class Synapsida |
|
Dinosauria |
|
Class
Mammalia (the mammals) |
|
From
the first dawn of life, all organic beings are found to resemble
each other in descending degrees, so they can be classed in
groups under groups.
Charles
Darwin, Origin of Species, Chapter 13
|