| Summary: | All known members of the stratigraphically important and cosmopolitan ammonite subfamily Texanitinae are documented from the Campanian rocks of the Western Interior of the United States for the first time. Submortoniceras tequesquitense Young, 1963, occurs in the upper part of the Mancos Shale in Santa Fe County in north-central New Mexico; Menabites (Delawarella) vanuxemi (Morton, 1830) occurs in the Mancos Shale at Sandoval County, New Mexico; and Menabites (Delawarella) danei Young, 1963, occurs at the top of the Apache Creek Sandstone Member of the Pierre Shale in Pueblo County, Colorado. -Authors
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