Newmarracarroceras Explained

Newmarracarroceras is an ammonite from the early middle Jurassic^[1] with a ribbed subinvolute shell with a keel running along the venter, or outer rim. The umbilicus is moderately wide, exposing the inner whorls exposed in part.

Newmarracarroceras has a fairly wide geographic range and includes species previously described under Fontannesia. Related genera include Asthenoceras, Fontannesia, Guhsania, and Witchellia.

References

• Book: W.J. . Arkell . B. . Kummel . C.W. . Wright . Treatise on Invertebrate Paleontology, Part L, Mollusca 4. Mesozoic Ammonoidea . Geological Society of America and University of Kansas Press . Lawrence, Kansas. 1957.

Notes and References

1. Sepkoski . Jack . A compendium of fossil marine animal genera (Cephalopoda entry) . Bulletins of American Paleontology . 363 . 1–560 . 2002 . 2017-10-18.