Post-embryonic development of Fritzolenellus suggests the ancestral morphology of the early developmental stages in Trilobita

Lukáš Laibl, Jörg Maletz & Pascal Olschewski
Trilobite development has been intensively explored during past decades, but information about ancestral character combinations in the early developmental stages of trilobites remains virtually unknown. Trilobites of the superfamily Olenelloidea are one of the earliest diverging groups. Study of their development coupled with the development of other early diverging trilobite groups can provide crucial information about the ancestral morphology of trilobite early stages. Herein we describe numerous well-preserved specimens of the olenelloid trilobite Fritzolenellus lapworthi....
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