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Temporal range: Bajocian
Phaulostephanus is a small serptenticone with a generally subcircular to subquadrate whorl section, slightly sinuous ribbing, and tubercles that if present are weakly developed. Primary ribs are sharp, divide about mid flank into prominent and moderately sharp secondary ribs. The aperture of the macroconch has a broad ventral collar preceded by a constriction. That of the microconch is flanked by lappets and has no constriction.The suture is ammonitic.
Phaulostephanus was named by Buckman in 1927 and consideed a subgenus of Stephanoceras by Arkell, et al.(1957) in the Treatise. It was elevated to genus in Pavia (1983) and Westermann (1984) (ref't in Sandoval and Westermann 1986 )
Mexico and Hungary 
- Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28.
- The Bajocian (Jurassic) ammonite fauna of Oaxaca, Mexico; Jose Sandoval & Gerd E. G. Westermann; Jour Paleo V.67, N.6, p.1220, Nov. 1986
- Mesozoic Ammonoidea, Arkell, Kummel, & Wright 1957; Treatise on Invertebrate Paleontology, Part L, Mollusca 4
- "Paleobiology Database". Retrieved 2014-05-28.
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