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Paläontologische Zeitschrift

, Volume 69, Issue 1–2, pp 265–281 | Cite as

The external gills and ornamentation of skull roof bones of the Lower Permian tetrapodDiscosauriscus (Kuhn 1933) with remarks to its ontogeny

  • Jozef Klembara Bratislava
Article

Abstract

Until now, the largest specimens ofDiscosauriscus (and alsoUtegenia andAriekanerpeton- the Lower Permian members of the family Discosauriscidae) have been considered to be adult individuals. The largest specimens ofDiscosauriscus, in which the external gills are still present, had skull lengths of about 22-25 mm. Metamorphosis was believed to have commenced at this size in discosauriscids and specimens with skull lengths of about 50-54 mm were considered to be already adult or senile.

New finds ofDiscosauriscus demonstrate the presence of external gills in specimens with skull lengths of up to 32 mm. On the base of this, together with the ornamentation or the skull roof bones and osteological features of new large specimens, it is here concluded that 1)Discosauriscus represents the larval, metamorphic and early juvenile stages of a reptiliomorph tetrapod, the adults of which are yet unknown and 2) two other discosauriscids(Ariekanerpeton andUtegenia) also represent early ontogenetic stages.

Keywords

Lower Permian Large Specimen Pennsylvanian Skull Length Skull Roof 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Kurzfassung

Bis jetzt sind die größten Individuen vonDiscosauriscus (wie auchUtegenia undAriekanerpeton, unterpermische Mitglieder der Familie Discosauriscidae) für adulte Individuen gehalten worden. Die größten Exemplare vonDiscosauriscus, die noch äußere Kiemen besitzen, haben eine Schädellänge von etwa 22-25 mm. Es ist vorausgesetzt worden, daß die Metamorphose bei Discosau-risciden ungefähr bei dieser Größe anfing und daß die Individuen mit einer Schädellänge von etwa 50-54 mm schon adult oder senil waren.

Neue Funde vonDiscosauriscus zeigen die Anwesenheit von äußeren Kiemen in Exemplaren mit einer Schädellänge bis zu 32 mm. Diese Beobachtung, die Ornamentierung der Schädeldachknochen und osteologische Merkmale der neuen, großen Individuen legen nahe, daß 1)Discosauriscus die larvalen, metamorphosierenden und frühjuvenilen Stadien eines reptiliomorphen Tetrapoden repräsentiert, dessen Adultindividuen noch nicht bekannt sind und daß 2) die zwei anderen Discosaurisciden(Ariekanerpeton undUtegenia) ebenfalls frühontogenetische Stadien darstellen.

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Copyright information

© E. Schweizerbart’sche Verlagsbuchhandlung 1995

Authors and Affiliations

  • Jozef Klembara Bratislava
    • 1
  1. 1.Zoological InstituteComenius UniversityBratislavaSlovakia

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