Lower Turonian ammonites from Texas and Mexico

Abstract

adkinsi, n. sp., of the family Tissotiidae, subfamily Pseudotissotiinae, and Spathites chispaensis, n. gen., n. sp., of the family Vascocer- atidae, are described. Other species of Hoplitoides and of the vascoceratid genera Fagesia and Neoptychites are described. All specimens are from the Chispa Summit formation (Turonian) of northern Mexico and west Texas. The species of Spathites and Hoplitoides are closely allied to lower Turonian species of North Africa.