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Heterochrony in the Silurian radiation of encrinurine trilobites

Lethaia, 1987-10, Vol.20 (4), p.337-351 [Peer Reviewed Journal]

Copyright © 1987 Lethaia Foundation ;ISSN: 0024-1164 ;EISSN: 1502-3931 ;DOI: 10.1111/j.1502-3931.1987.tb02053.x

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  • Title:
    Heterochrony in the Silurian radiation of encrinurine trilobites
  • Author: Edgecombe, Gregory D. ; Chatterton, Brian D. E.
  • Subjects: Balizoma ; Encrinurinae ; Encrinuroides ; Encrinurus ; Heterochrony ; Leonaspis ; Silurian
  • Is Part Of: Lethaia, 1987-10, Vol.20 (4), p.337-351
  • Description: Divergence of Silurian encrinurine trilobite clades from common ancestry may be modelled as hetero‐chronic pattern. Comparing ontogenies of ancestral late Ordovician Encrinuroides and the descendant punctarus and uariolaris plexi of Silurian Encrinurus provides a test of this hypothesis. Heterochrony in the punctarus plexus is dissociated with respect to entire organisms, but regionally global throughout cranidia (paedomorphic states) and pygidia (peramorphic states). Regulatory dissociation may explain the apomorphous enrollment strategy of this group. The uariolaris plexus, for which a growth series of Balizoma dimitroui (Perry & Chatterton) provides ontogenetic data, shows a complex of peramorphic cephalic character states. Changes in developmental timing thus provide a mechanism by which morphologic and ecologic divergence of closely‐related clades was catalyzed in the Llandovery encrinurine radiation. Paedomorphic and dissociated Lineages of the odontopleurid Leonaspis provide a comparable example of divergent heterochronic pattern associated with coexisting (in the same biofacies) species of comparatively recent common ancestry.
  • Publisher: Oxford, UK: Scandinavian University Press
  • Language: English;Norwegian
  • Identifier: ISSN: 0024-1164
    EISSN: 1502-3931
    DOI: 10.1111/j.1502-3931.1987.tb02053.x
  • Source: Alma/SFX Local Collection
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