A new genus of Cretaceous margaritine gastropod (Turbinidae) from the northeastern Pacific Ocean

作者：Squires Richard L^*

来源：Nautilus, 2011, 125(3): 137-149.

• Mollusca
• Margaritinae
• fossil
• endemic
• temperate waters

Igonoia, a new genus of a margaritine vetigastropod, is recognized from Lower and Upper Cretaceous rocks in the northeastern Pacific, in the region extending from Vancouver Island, British Columbia, to southern California. Eight species are known, five are new: the early late Albian I. kieli new species and I. shastana new species; the late Cenomanian I. onoensis new species and I. stewarti (Murphy and Rodda, 1960) new combination; the late Turonian I. yucca new species; the Santonian I. occidentalis (Whiteaves, 1903) new combination; and the Maastrichtian I. angulata (Gabb, 1869) new combination and I. muiri new species. Igonoia is presently known to be endemic to the study area. Specimens are found predominantly in northern California, in fine-grained siliciclastic sandstones that were deposited in warm-temperate, shallow-marine waters. Specimens are most numerous in Santonian rocks.

• 出版日期2011-9-1