6533b85ffe1ef96bd12c23d9

RESEARCH PRODUCT

A new Alokistocaridae Resser, 1939 (Trilobita) from the middle Cambrian of Spain

Samuel ZamoraJorge EsteveRodolfo GozaloFrederick A. Sundberg

subject

SubfamilybiologyCephalonPtychopariidaPaleontologyZoologybiology.organism_classificationCladisticsTrilobiteAlokistocaridaePaleontologyGondwanaSpace and Planetary ScienceLaurentiaGeology

description

A new trilobite species, Schopfaspis? graciai, from the middle Cambrian of Spain is the first member of Alokistocaridae reported from west Gondwana. A cladistic analysis of this trilobite and other Gondwanan trilobites of possible alokistocarid affinities (Schopfaspis granulosa, Chelidonocephalus anatolicus, Derikaspis toluni, Kounamkites multiformis) suggests that this family can be divided into two subfamilies: Alokistocarinae and Altiocculinae. Schopfaspis? graciai nov. sp. and Schopfaspis granulosa are assigned to the subfamily Altiocculinae laying in a more basal position than Altiocculus species. The cladistic analysis also demonstrates a possible relationship of Chelidonocephalus anatolicus and Derikaspis toluni with Alokistocaridae. Enrolment is analysed in this new trilobite describing novelties in the ventral surface of the cephalon which allowed interlocking of the trunk and cephalon in a discoidal enrolment-type.

yearjournalcountryeditionlanguage
2012-05-01Geobios
https://doi.org/10.1016/j.geobios.2011.10.003