Pachyceratidae is a family of Perisphinctoidean ammonites from the upper Middle - and lower Upper Jurassic. Genera within the Pachyceratidae have shells that are in general moderately involte but with most of the inner whorls exposed; whorl sections subquadrate to subtrapezoidal, with rounded venter. Ribbing is strong, in some sharp. Primary ribs typically branch above mid flanks into twos, threes, and even fours. Genera, as described in the Treatise on Invertebrate Paleontology, Part L. (1957):
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- Pachyceratidae (en)
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| - Pachyceratidae es una familia de amonitas perisfinctoideas del Jurásico superior medio e inferior. Los géneros dentro de Pachyceratidae tienen caparazones que son en general moderadamente involucrados pero con la mayoría de los verticilos internos expuestos; secciones de verticilo subcuadrado a subtrapezoidal, con venter redondeado. El nervadura es fuerte, en algunos afilados. Las costillas primarias generalmente se ramifican por encima de los flancos medios en dos, tres e incluso cuatro. Géneros, como se describe en el Tratado de Paleontología de Invertebrados, Parte L. (1957) : (es)
- Pachyceratidae is a family of Perisphinctoidean ammonites from the upper Middle - and lower Upper Jurassic. Genera within the Pachyceratidae have shells that are in general moderately involte but with most of the inner whorls exposed; whorl sections subquadrate to subtrapezoidal, with rounded venter. Ribbing is strong, in some sharp. Primary ribs typically branch above mid flanks into twos, threes, and even fours. Genera, as described in the Treatise on Invertebrate Paleontology, Part L. (1957): (en)
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| - Pachyceratidae es una familia de amonitas perisfinctoideas del Jurásico superior medio e inferior. Los géneros dentro de Pachyceratidae tienen caparazones que son en general moderadamente involucrados pero con la mayoría de los verticilos internos expuestos; secciones de verticilo subcuadrado a subtrapezoidal, con venter redondeado. El nervadura es fuerte, en algunos afilados. Las costillas primarias generalmente se ramifican por encima de los flancos medios en dos, tres e incluso cuatro. Pachyceratidae, según Donovan et al. (1981), se derivaron de los Perisphinctidae en el Calloviano medio aproximadamente al mismo tiempo que los Aspidoceratidae de vida más larga , y duraron solo en el Oxfordiense posterior . Esto difiere de la perspectiva de Arkell, et al. (1957) en el Tratado en el que Pachyceridae se incluye en Stephanoceratoidea , derivado de Tulitidae y que da lugar a Mayaitidae. Géneros, como se describe en el Tratado de Paleontología de Invertebrados, Parte L. (1957) :
* :moderadamente involutas; las costillas primarias se ramifican en múltiples secundarias. (M Callov ).
* ,subgen de Erymoceras con costillas secundarias más numerosas. (M Callov).
* :involuta, último verticilo comprimiéndose y parecido a Pachyceras ; subgen de Erymnoceras . (U Callov)
* :evolutas, más o menos planuladas; costillas gruesas, ramificadas de tubérculos en el borde umbilical. (M Callov).
* Pachyceras:básicamente involutas; borde umbilical redondeado, no tuberculado; las costillas se desvanecen en la mitad interior de los lados del verticilo; último verticilo comúnmente liso o con pliegues ventrales solamente. (U Callov - L Buey ).
* :se diferencia de Pachyceras s.s. engrosando las nervaduras del último verticilo y desarrollando espirales excéntricas; subgénero (?) de Pachyceras . (L- U Oxf). (es)
- Pachyceratidae is a family of Perisphinctoidean ammonites from the upper Middle - and lower Upper Jurassic. Genera within the Pachyceratidae have shells that are in general moderately involte but with most of the inner whorls exposed; whorl sections subquadrate to subtrapezoidal, with rounded venter. Ribbing is strong, in some sharp. Primary ribs typically branch above mid flanks into twos, threes, and even fours. The Pachyceratidae, according to Donovan et al. (1981), were derived from the Perisphinctidae in the mid Callovian at about the same time as the longer lived Aspidoceratidae, lasting only into the subsequent Oxfordian. This differs from the perspective of Arkell, et al. (1957) in the Treatise wherein the Pachyceridae is included in the Stephanoceratoidea, derived from the Tulitidae and giving rise to the Mayaitidae. Genera, as described in the Treatise on Invertebrate Paleontology, Part L. (1957):
* : moderately involute; primary ribs branch into multiple secondaries. (M Callov).
* , subgen of Erymoceras with more numerous secondary ribs. (M Callov).
* : involute, last whorl becoming compressed and Pachyceras-like; subgen of Erymnoceras. (U Callov)
* : evolute, more or less planulate; ribs coarse, branching from tubercles at umbilical edge. (M Callov).
* Pachyceras: basically involute; umbilical edge rounded, non tuberculate; ribs fade on inner half of whorl sides; last whorl commonly smooth or with ventral folds only. (U Callov - L Oxf).
* : differs from Pachyceras s.s. by coarsening ribs on last whorl and developing eccentric coils; subgenus(?) of Pachyceras. (L- U Oxf). (en)
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