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Edad: Superfamilia TRIGONOCERATACEAE Hyatt, 1 884. Concha recta, giro a nautilocono, sifón central y vientre angosto; éste último es agudo, ancho, cóncavo o redondo. Ornamentación en espiral. Edad: Devónico-Triásico. ; en algunos casos se utilizará esa terminología, en las descripciones siguientes. Familia GRYPOCERATIDAE Hyatt, in Zittel, 1 900. Concha evoluta a involuta, comprimida, sección de vuelta rectangular, de lados subparalelos y vientre aplanado, a veces posee quilla y nódulos. La línea de sutura tiene un lóbulo ventral, uno lateral y otro dorsal.
El sifón es de posición variable. Edad: Carbonífero-Triásico. Hyatt, 1 893. Concha involuta, de crecimiento muy rápido, sección de vuelta semitrapezoidal, deprimidos lateralmente. Línea de sutura con lóbulos ventral, lateral y dorsal poco definidos. Edad: Pensilvánico-Pérmico. Género Stearoceras Lámina 111, figs. 4 y 7. Stearoceras sp. Edad: Pérmico Superior. Las Delicias, Coahuila. 48 Género Titanoceras Hyatt, 1 884. Concha evo/uta, ombligo ancho y perforado, sección de vuelta semirectangular; más alta que ancha, vientre cóncavo a semianguloso, posee tubérculos alargados longitudinalmente.
Sp. Edad: Wordiano-Amarasiano (Pérmico Superior) Capas La Difunta-La Colorada. Stacheoceras toumanskyae Miller y Furnish Edad: Wordiano-Amarasiano (Pérmico Superior) Capas La Difunta-La Colorada. Strigogoniatites kingi Miller Edad: Wordiano (Pérmico Superior) Capas La Difunta . Syrdenites n. sp. Edad: Wordiano (Pérmico Superior) Capas La Difunta. Kingoceras kingi Miller Edad : Amarasiano (Pérmíco Superior) Capas La Colorada. 38 Xenodiscus wanneri Spinosa, Furnish y Glenister Edad: Amarasiano (Pérmico Superior) Capas La Colorada Eoaraxoceras ruzhencevi Spinosa, Furnish y Glenister Edad: Amarasiano (Pérmico Superior) Capas La Colorada.