NUEVOS TRILOBITES DEL OVETIENSE INFERIOR (CÁMBRICO INFERIOR BAJO) DE SIERRA MORENA (ESPAÑA)

Eladio Liñán, Rodolfo Gozalo, María E. Dies Álvarez, José A. Gámez Vintaned, Samuel Zamora

Abstract


Trilobites
from two lower Ovetian (low lower Cambrian) localities in Sierra Morena (south of Spain) are described.
Serrania palaciosi nov. sp. and Serrania? gordaensis nov. sp. come from the western locality (Alconera). New
specimens of Serrania verae Liñán Guijarro, 1978 come from the eastern locality (Sierra de Córdoba). The
ontogenetic study of S. verae suggests that this species evolved from S. palaciosi. The new material allows
us to include the genus Serrania within the new subfamily Serrinae defined herein, belonging to the family
Bigotinidae. We include also two more genera with a lateral spine in the glabella, Hupetina and Sdzuyia.
According to its stratigraphical position and the associated taxa, we can determinate that S. verae belongs
to the Lemdadella linaresae Zone, corresponding to the lower part of the archaeocyatids Zone III. On the basis
of stratigraphic and phylogenetic criteria, S. palaciosi nov. sp. and S.? gordaensis nov. sp. from Alconera
belong probably to the Zone I of archaeocyathids. Some unclassifiable trilobite fragments have been also
found in the Zone I of archaeocyathids at the Ovetian stratotype in Sierra de Córdoba, below the trilobite
zone of Bigotina bivallata (which is equivalent to the trilobite Zone 0, or Eofallotaspis Zone, of Morocco). The
new species defined herein are, up to now, the oldest trilobites described from Gondwana.

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