After Clarkson, 1998 [based on House, 1988], Nied´zwiedzki, Salamon & Boczarowski, 2001, Hsiung, 2002- [“Les Fossiles”] and Work & Boardman, 2003

This is not for a long way a perfect presentation of diversity and sheer numbers of Ammonoid taxons. If any one has additional material and phylogeny and species... Please contact me... I simply don't have time to cypher out all of them... :-[

<==o †Ammonoidea Zittel, 1884 (ammoniitit; ammonites)
   |--o †Anacestida
   |  |?- †Gyroceratites
   |  |?- †Paraphyllites
   |  |?- †Prolobites
   |  |--o †Anarcestina
   |  |  |?- †Anarcestes
   |  |  |?- †Maenioceras
   |  |  |-- †Prolobitoidea [Prolobitaceae]
   |  |  `-- †Anarcestoidea [Anarcestaceae]
   |  `--o †Gephuroceratina
   |     |?- †Manticoceras
   |     |-- †Gephuroceratoidea [Gephurocerataceae]
   |     `-- †Pharciceratoidea [Pharcicerataceae]
   |?-o †Clymeniida
   |  |?- †Cyrtoclymenia
   |  |?- †Epiwocklumeria
   |  |--o Platyclymeniina [Glymeniina]
   |  |  `--o †Clymeniina [Pharcicerataceae]
   |  |     `--o †Clymenoidea [Clymeniaceae]
   |  |        |-- †Clymenia
   |  |        `-- †Platyclymenia
   |  `--o †Gonioclymeniina
   |     |?- †Wocklumeria
   |     |--o †Gonioclymenoidea [Gonioclymeniaceae]
   |     |  `-- †Gonioclymenia
   |     `--o †Parawocklumeriaceae [Parawocklumeroidea]
   |        `-- †Parawocklumeria
   `--+-- †Goniatitida Hyatt, 1884
      `--o †Prolecanitida [Prolecanitina]
         |-- †Medlicottoidea [Medlicottiaceae]
         `--+==o †Prolecanitoidea [Prolecanitaceae]
            `--+==o †Ceratitida (keratiitit; ceratites)
               |--o †Phylloceratida
               |  |-- †Holcophylloceras
               |  |-- †Phylloceras
               |  |-- †Phyllopachyceras
               |  `-- †Tragophylloceras
               `--+--o †Lytoceratida
                  |  |-- †Alocolytoceras
                  |  `-- †Lytoceras
                  `--+-- †Ammonitida Zittel, 1884 (aito-ammoniitit; Ammonites)
                     `-- †Ancyloceratida Wiedmann, 1966 [Ankyloceratina Wiedmann, 1966]

Miscellaneous Ammonites:

    Neoaganides grahamensis Plummer & Scott, 1937
    Glaphyrites sp. [Work & Boardman, 2003]
    Aristoceras caddoense (Plummer & Scott, 1937
    Aristoceras cf. A. caddoense (Plummer & Scott, 1937
    Schistoceras sp. [Work & Boardman, 2003]
    Pennoceras? sp. [Work & Boardman, 2003]
    Pseudaktubites stainbrooki (Plummer & Scott, 1937)
    Vidrioceras conlini Miller & Downs, 1950
    Emilites incertus (Böse, 1919)
    Boesites texanus (Böse, 1919)
    Uddenoceras sp.

Reference(s):