User talk:PA/Vertebrate taxonomy

Proposal

in a first step

• to remove "Superclassis:Tetrapod" from Osteichthyes
• to add "Superclassis:Tetrapod" in Amphibia, Reptilia, Aves & Mammalia
• to add in Gnathostomata:

(Super)Classes: †Placodermi - Chondrichthyes - †Acanthodii - Osteichthyes - Tetrapoda

• with in Superclassis: Osteichthyes:

Classes: Actinopterygii - Sarcopterygii

• with in Superclassis: Tetrapoda:

Classes: Amphibia - Reptilia - Aves - Mammalia

1 bis - displacement of Cephalaspidomorphi

for Cephalaspidomorphi - I'm afraid the situation is unclear and probably a transitory solution could be:

• in Vertebrata:

Infraphyla: †Pteraspidomorphi - †Thelodonti - Cephalaspidomorphi - Gnathostomata

• in (unranked):Cephalaspidomorphi

(unranked): Osteostraci - Galeaspida - Pituriaspida - Anaspida - Hyperoartia

• change Hyperoartia as (unranked) with (in place of Agnatha)

Ordo: Petromyzontiformes

(N.B. It could be more prudent to develop all Cephalaspidomorphi directly under Vertebrata. Myxini have to be added at the relevant place.)

in a 2nd step

It could be interesting to add some phylogenetic indications.

Evolution leads to situations as: Former_clade => New_clade ; complementary_of_New_clade.

A presentation of the phylogenetic tree could be:

• step i : New_clade_i, toxonomic_rank_of_New_clade_i,

(eventually) complementary_of_New_clade_i, toxonomic_rank_of_complementary_of_New_clade_i

The presentation can be:

for Subphylum: Vertebrata

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata

(...)

└(unranked): Cephalaspidomorphi

└Classis: †Placodermi

└Classis: Chondrichthyes

├Classis: †Acanthodii

└SuperClassis: Osteichthyes

or (more compact):

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata

(...) Cephalaspidomorphi; Placodermi; Chondrichthyes; Acanthodii - Osteichthyes.

In fact it is not very different from the actual presentation: only differ the order & delimiters.

for Superclassis: Osteichthyes

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata

Infraphylum: Gnathostomata

SuperClassis: Osteichthyes

├Classis: Actinopterygii

└Classis: Sarcopterygii

for Classis: Sarcopterygii

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata

SuperClassis: Osteichthyes

Classis: Sarcopterygii

└Subclassis: Coelacanthimorpha

└Subclassis: Tetrapodomorpha

└Subclassis: Dipnoi

for Subclassis: Tetrapodomorpha

Subclassis: Tetrapodomorpha

└Order: †Rhizodontida

└Superorder: Osteolepidida

└Order: †Panderichthyida

?: †Tiktaalik

└SuperClassis: Tetrapoda

for Superclassis: Tetrapoda

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata

SuperClassis: Tetrapoda

Classis: Amphibia

Classis: Reptilia

Classis: Aves

Classis: Mammalia

for Classis: Mammalia

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata

SuperClassis: Tetrapoda

Classis: Mammalia

Subclassis: Prototheria - Theria

Alternative: Protheria - Metatheria - Eutheria

Unplaced extinct orders: Multituberculata - Haramiyida - Gondwanatheria - Docodonta

PA 20:34, 13 August 2006 (UTC)

Here below the cladogram published in Wikipedia:

Subphylum Vertebrata
├─(unranked) Gnathostomatomorpha
└─Infraphylum Gnathostomata
      ├─Class Placodermi - extinct (armored gnathostomes)
      └Microphylum Eugnathostomata (true jawed vertebrates)
         ├─Class Chondrichthyes (cartilagenous fish)
         └(unranked) Teleostomi (Acanthodii, Tetrapoda & Osteichthyes)
             ├─Class Acanthodii - extinct ("spiny sharks")
             └Superclass Osteichthyes (or Teleostomi) (bony fish)
                 ├─Class Actinopterygii (ray-finned fish)
                 └─Class Sarcopterygii (lobe-finned fish)
                    └Superclass Tetrapoda
                        ├─Class Amphibia (amphibians)
                        └(unranked) Amniota (amniotic egg)
                            ├─Class Reptilia (reptiles or sauropsids)
                            │           └─Class Aves (birds)
                            └Class Synapsida
                                └─Class Mammalia (mammals)

Note lines show evolutionary relationships.

I posted some relevant links from the Tree of Life website here: http://species.wikimedia.org/wiki/Talk:Gnathostomata_%28Vertebrata%29

Your first suggestions essentially match TOL's taxonomy. The only difference I recall is that they don't use Osteichthyes; they leave Actinoptergyii and Sarcopterygii separate. Given that, I vote for carrying them out.

I'm less certain about your other suggestions concerning the clades. I agree that it is interesting. I'm concerned about the cladograms becoming too unwieldy and difficult to change or navigate, though.-- Rutledge 4:50 5 November 2006 (EST)