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Oxfordian idoceratids (Ammonoidea) and their relation to Perisphinctes Proper

100%

Brochowicz-Lewinski W.

Acta Palaeontologica Polonica

1976

tom 21

nr 4

An attempt is made to reconstruct the evolution of idoceratids (Perisphinctidae) during the Oxfordian. The subgenus Nebrodites (Passendorferia) is supposed to be the ancestor of N. (Mesosimoceras), whilst N. (Enayites) subgen. n. - of N. (Nebrodites) and possibly of Idoceras planula group. Both genera appear to be of European origin. Differentiation of Mediterranean and Submediterranean perisphinctidae appears questionable.

On the Oxfordian genus Subdiscosphinctes Malinowska, 1972, and subgenus S. (Aureimontanites) nov. (Perisphinctidae, Ammonoidea)

100%

Brochowicz-Lewinski W.

Acta Palaeontologica Polonica

1975

tom 20

nr 1

Middle Oxfordian forms resembling Lithacoceras Hyatt, 1900, are placed in Subdiscosphinctes Malinowska, 1972. The type species of the latter, Perisphinctes kreutzi Siem., does not represent immature macroconch but rather microconch. Therefore, Subdiscosphinctes (Subdiscosphinctes) Malinowska is interpreted as subgenus comprising microconchs only, and a new subgenus, (Aureimontanites) nov. is proposed for macroconchs.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

2 Brochowicz-Lewinski W.

1 1976

1 1975

Wyniki wyszukiwania

Oxfordian idoceratids (Ammonoidea) and their relation to Perisphinctes Proper

On the Oxfordian genus Subdiscosphinctes Malinowska, 1972, and subgenus S. (Aureimontanites) nov. (Perisphinctidae, Ammonoidea)