After Kazlev, 2002, and Anonymous, 2009 [“Wikipedia – The Free Encyclopedia”]
<==o †Ascocerida Kuhn, 1949 [nom. correct. Teichert, 1964 pro Ascoceracea Kuhn, 1949] `==o †“Hebetoceratidae” |?- †Montyoceras |?- †Schuchertoceras Miller |?- †Shamattawaceras ascoceroides Foerste & Savage |?- †Ecdyceras |?- †Pachecdyceras `--+?- †Hebetoceras `--+?- †Redpathoceras |--o †Choanoceratidae | `-- †Choanoceras `--+?- †Probillingsites `--o †Ascoceratidae |?- †Parascoceras |?- †Pseudascoceras |?- †Aphragmites |?- †Lindstroemoceras Miller `--+-- †Schucertoceras `--+--o †Billingsites | `-- †B. candensis (Billings) `--+--o †Ascoceras | |-- †A. barrandei Salter | `-- †A. vermiforme Blake `-- †Glossoceras
Reference(s):
- Kazlev, M. A. 1999-2002: Ascocerida. [last updated: 2002-09-14]
–iNet: The Palaeos: http://www.palaeos.com/Invertebrates/Molluscs/Cyrtosoma/Neocephalopoda/Ascocerida.html [visited: 2009-04-22] - Anonymous, 2009: Ascocerida. [last updated: 2009-01-03]
iNet: Wikipedia: http://en.wikipedia.org/wiki/Ascocerida [visited: 2009-04-22]