Abstract:
Type material for 206 nominal species of ammonoids are in the Invertebrate Paleontology Collections of Yale University's
 Peabody Museum of Natural History. Primary types for 86 nominal species include 46 holotypes, 418 syntypes (repre-
 senting 36 nominal species), 3 lectotypes and 1 neotype.  Secondary types for 3  nominal species include 7 allotypes, 105
 paratypes and 36 paralectotypes.  Tertiary  types of 132 nominal species include 852  hypotypes. Most types are from
Coahuila (Mexico), South Dakota, Texas and  Wyoming and have been described by E.  Böse, S.S. Buckman, W.A.
Cobban, N.H. Landman, A.K. Miller and K.M. Waage.
Introduction:
This catalog lists all known ammonoid types in the Invertebrate Paleontology Collections housed in Yale University's Peabody
 Museum of Natural History.  This is the eleventh in a series of type catalogs of fossil  invertebrates and is a product of an
ongoing computerization project to improve the accessibility of the type collections.
 Eight type specimens are missing and cannot be located.  The collections have been thoroughly searched by the curatorial
 staff in the 1960s and 1990s and it is believed that these specimens are permanently lost.  Missing specimens are indicated
 with a footnote.