NDLI: Diversity of the Schizophoria lineage (Brachiopoda: Orthida) in the Lower and Middle Devonian of Poland and adjacent areas

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Diversity of the Schizophoria lineage (Brachiopoda: Orthida) in the Lower and Middle Devonian of Poland and adjacent areas

Content Provider	Springer Nature Link
Author	Halamski, Adam T.
Copyright Year	2012
Abstract	The nominative subgenus of Schizophoria (Brachiopoda, Orthida) is represented in the Lower and Middle Devonian of Poland and of the western Ukraine by six taxa: late Emsian Schizophoria (S.) interstrialis, late Eifelian S. (S.) schnuri biscissa, early Givetian S. (S.) schnuri schnuri, middle to late Givetian S. (S.) schnuri prohibita ssp.n., middle Givetian S. (S.) parvaepunctata and late Givetian S. (S.) sp.n. (unnamed for lack of sufficient material). Morphotypes referable to S. (S.) schnuri biscissa and to S. (S.) schnuri junkerbergiana co-occur in the same outcrop (not necessarily in the same levels), wherefore the separation of these subspecies may be maintained only if they are considered as chronosubspecies (unverifiable on the studied material) but not as geographic variants (hypothesis falsified by the studied material). A lectotype for S. (S.) interstrialis and a neotype for S. (S.) parvaepunctata are selected. Punctae diameter and density (either an important systematic character according to some authors or devoid of such value according to other ones) were investigated: they show important within-individual and within-sample variation, wherefore they cannot serve to distinguish related species. On the contrary, punctae character combinations are sufficiently constant to help differentiate subgenera or groups of species. In the studied material, three clusters are distinguished on the basis of the punctae characteristics: S. (Pachyschizophoria) and S. (S.) parvaepunctata differ between each other and from all other investigated species of S. (Schizophoria); the latter are indistinguishable on the sole basis of punctae characteristics.Die nominative Untergattung von Schizophoria (Brachiopoda, Orthida) ist im Unter- und Mitteldevon Polens und der westlichen Ukraine durch sechs Taxa vertreten: Schizophoria (S.) interstrialis aus dem oberen Emsium, Schizophoria (S.) schnuri biscissa aus dem oberen Eifelium, S. (S.) schnuri schnuri aus dem unteren Givetium, S. (S.) schnuri prohibita ssp.n. aus dem mittleren bis oberen Givetium, S. (S.) parvaepunctata aus dem mittleren Givetium, und S. (S.) sp.n. (nicht benannt wegen des nicht ausreichendes Material) aus dem späten Givetium. Die zu S. (S.) schnuri biscissa und S. (S.) schnuri junkerbergiana beziehenden Morphotypi kommen zusammen an derselben Lokalität vor (aber nicht notwendigerweise in demselben Stratum), darum können sie nur als Chronosubspecies (nicht belegbar nach dem untersuchten Material) unterschieden werden, aber nicht als geographische Varianten (Hypothese widerlegt nach dem untersuchten Material). Ein Lectotypus für S. (S.) interstrialis und ein Neotypus für S. (S.) parvaepunctata werden ausgewählt. Der Durchmesser und die Dichte der Poren (nach einigen Autoren ein gutes taxonomisches Merkmal und nach anderen nicht), werden untersucht: Die Variation innerhalb eines Individuums und einer Probe ist bedeutend, darum kann sie nicht benutzen werden, um die verwandte Arten zu unterscheiden. Im Gegenteil, Porenmerkmalekombinationen sind genügend fest, darum kann sie helfen, um die Untergattungen oder die Artgruppen zu unterscheiden. In dem untersuchten Material werden drei Gruppen nach Porenmerkmale unterschieden: S. (Pachyschizophoria) und S. (S.) parvaepunctata unterscheiden sich voneinander und von den übrigen untersuchten Arten von S. (Schizophoria); diese können allein den Porenmerkmale unterschieden werden.
Starting Page	347
Ending Page	365
Page Count	19
File Format	PDF
ISSN	00310220
Journal	Paläontologische Zeitschrift
Volume Number	86
Issue Number	4
e-ISSN	18676812
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-03-20
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Brachiopoda Orthida Schizophoria Heiligkreuzgebirge Volhynien Mitteldevon Taxonomie Porenverteilung Paleontology
Content Type	Text
Resource Type	Article
Subject	Paleontology

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Diversity of the Schizophoria lineage (Brachiopoda: Orthida) in the Lower and Middle Devonian of Poland and adjacent areas

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Diversity of the Schizophoria lineage (Brachiopoda: Orthida) in the Lower and Middle Devonian of Poland and adjacent areas

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Diversity of the Schizophoria lineage (Brachiopoda: Orthida) in the Lower and Middle Devonian of Poland and adjacent areas