Cephalopoda - Ammonitida - Sphaeroceratidae
The type locality here is that of IGM 1926 which is "forma 2"
Alternative combination: Macrocephalites nikitini
Full reference: C. Burckhardt. 1927. Cefalópodos del Jurásico Medio de Oaxaca y Guerrero. Boletin Instituto Geologico Mexico 47:1-108
Belongs to Xenocephalites according to J. Sandoval et al. 1990
See also Burckhardt 1927
Sister taxa: Xenocephalites araucanus, Xenocephalites bearpawensis, Xenocephalites grantmackiei, Xenocephalites hartsocki, Xenocephalites neuquensis, Xenocephalites vicarius
Type specimen: IGL:IGM:1926. Its type locality is Arroyo El Rincon, El Cuahulote - Tecojcoyunca Rd, which is in a Bathonian/Callovian marine horizon in the Yucunuti Formation of Mexico.
Ecology: fast-moving nektonic carnivore
Distribution: found only at Arroyo El Rincon, El Cuahulote - Tecojcoyunca Rd
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.