New Passendorferiinae ammonites from the upper Bimammatum Zone (Hauffianum Subzone), lowermost Kimmeridgian of the Wieluń Upland, central Poland, and their biostratigraphic and phylogenetic importance
Keywords:
ammonites, taxonomy, Passendorferiinae, Ataxioceratinae, phylogeny, stratigraphic correlation, Submediterranean succession, transgressive eventsAbstract
The new passendorferiid ammonite species Graefenbergites ingae sp. nov. along with several other stratigraphically important ammonite taxa are recognized in a very complete succession of the Hauffianum Subzone of the Bimammatum Zone of the lowermost Kimmeridgian present in the Wieluń Upland. This new discovery of ammonites of Mediterranean origin proves the continuation of the Graefenbergites lineage known previously only from the basal part of the Hypselum Zone of the uppermost Oxfordian in the Submediterranean Province in Europe, and indicates the appearance of these ammonites on the northern Tethyan shelf during transgressive events. The specimens of Graefenbergites ingae described show biplicate and simple ribbing of the inner whorls, followed by trifurcate and polygyrate ribbing on the outer whorls. The new morphological characters on the outer whorls are generally akin to those of the “Orthosphinctes group” of the subfamily Ataxioceratinae, but the ornamentation differs from that of the type species of the genus Orthosphinctes in some features including development of longer secondaries showing a characteristic forward sweep on the ventral side. This may indicate the origin of some forms of Ataxioceratine directly from Passendorferiinae.Downloads
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