The evolutionary trend of platform denticulation in Middle Triassic acuminate Gondolellidae (Conodonta)
Acuminate Middle-Late Triassic Gondolellidae are characterized by an
ellipsoid platform with a central to posterior amygdaloid basal cavity
and an octomembrate apparatus of gondolelloid affinity. Starting with a
neospathodiform proteromorph during the Anisian, their anagenetic
lineage developed during the Fassanian, Longobardian, and Julian, ending
in another neospathodiform proteromorph. As the increase in complexity
in the platform denticulation is an important evolutionary trend, three
new genera are proposed: Guexispathodus n. gen., Marquezella n. gen., and Kirilella n. gen., which, together with Pseudofurnishius and Mosherella, represent the subfamily Marquezellinae n. subfam.
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