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Alvarado-Ortega J.,National Autonomous University of Mexico | Than-Marchese B.A.,Museo de Paleontologia eliseo Palacios Aguilera SEMAHN
Journal of Vertebrate Paleontology | Year: 2013

ABSTRACT - Pepemkay maya, gen. et sp. nov., is described based on a single complete specimen collected in El Chango Quarry, a marine Cenomanian limestone outcrop of the Sierra Madre Formation, near Tuxtla Gutiérrez, Chiapas State, southern Mexico. This species is identified as a new member of the Lissoberycinae and differs from other genera of this subfamily because it has an unornamented skull; bones of opercular series with non-spiny posterior borders; dorsal fin with five spines and eight soft rays; pelvic fin including a spine plus three branched soft rays; predorsal formula 0+0/0/1+1/; cycloid scales in the caudal peduncle and anterior half of the body, crenate scales between these body regions; and at least one scale on the opercle and other over the quadrate. Pepemkay maya is the first Trachichthyidae and Lissoberycinae fish found in marine Cretaceous deposits of America; its discovery complements our comprehension on the taxonomical diversity of fossil Trachichthyidae and supports the efforts directed to describe the processes involved in the evolution, origin, and early diversification of this group within an appropriate biogeographical framework, which now involves fossil evidence that has begun to appear in the Cretaceous fossil deposits of America. © 2013 by the Society of Vertebrate Paleontology.


Alvarado-Ortega J.,National Autonomous University of Mexico | Than-Marchese B.A.,Museo de Paleontologia eliseo Palacios Aguilera SEMAHN
Revista Mexicana de Ciencias Geologicas | Year: 2012

Zoqueichthys carolinae gen. and sp. nov. is described based on three specimens collected at the El Chango quarry, an outcrop of Cenomanian marine limestones belonging to the Sierra Madre Formation located in the Municipality of Ocozocoautla de Espinosa, near Tuxtla Gutiérrez, Chiapas State, southern Mexico. This species is identified as a new member of the superfamily Aipichthyoidea because it possesses a combination of characteristics previously recognized as diagnostic for this group. This species differs from other aipichthyoides in skeletal and meristic characteristics not previously reported in this superfamily including a completely laminar supraoccipital crest involving the participation of the supraoccipital and frontal bones, and lacking anterior thickening or spine; a pelvic fin with eight rays, and pectoral fin with twelve rays. Zoqueichthys carolinae is a basal member of the family Aipichthyoididae because it shows putative primitive characteristics including a comparatively high number of pelvic fin rays, three epurals, hypurals one and two are autogenous and in addition a complex supraoccipital crest. Zoqueichthys carolinae is the first aipichthyoid fish found in marine Cretaceous sediments deposited in the western Tethys Sea of southern North America.

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