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Hypophylloceras

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From Wikipedia, the free encyclopedia

Hypophylloceras
Temporal range: Valanginian–Maastrichtian[1]
A fossil of Hypophylloceras subramosum in Toyohashi Museum of Natural History
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: †Ammonoidea
Order: †Ammonitida
Family: †Phylloceratidae
Subfamily: †Phylloceratinae
Genus: †Hypophylloceras
Salfeld, 1924

Hypophylloceras is a Cretaceous ammonite with a finely ribbed, compressed, involute shell; some having periodic stronger ribs or folds. The suture is complex, with large, asymmetric and finely divided lobes; the 1st lateral being much larger than the external (=ventral) and 2nd lateral lobes. Saddle endings commonly not phylloid.[2]

Hypophylloceras includes Neophylloceras Shimizu 1934 (=Paraphylloceras Chimisu 1935 ), Hyporbulites Brestroffer 1947, Goretophylloceras Collingnon 1949 and Aphrotiticeras Mahmoud in Breister, 1952.[2]

The type species Hypophylloceras ononense, named by Salfeld in 1924 and based on Phylloceras ononense Santon 1895, comes from the Aptian of California.

References

[edit]
  1. ↑ Sepkoski, Jack (2002). "Sepkoski's Online Genus Database". Retrieved 2014-05-28.
  2. 1 2 Arkell, W.J.; Kummel, B.; Wright, C.W. (1957). Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Lawrence, Kansas: Geological Society of America and University of Kansas Press.


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