Campanian−Maastrichtian Pseudosabinia from Turkey: descriptions and taxonomic problems

Kocaeli Yarımadası, Amasya, Bayburt (Pontidler), Sivas, Malatya, Elazığ (Doğu Anadolu), Kahta–Adıyaman ve Yaylaçiftliği–Antakya (Arap platformu) gibi Türkiye’nin değişik bölgelerindeki Kampaniyen–Mastrihtiyen istiflerinden derlenen Pseudosabinia Morris & Skelton örnekleri tanımlanmış ve türlerin taksonomik konumları tartışılmıştır. Pseudosabinia klinghardti (Böhm) türü cinsin tipik özelliklerinin tümünü içerir. Cinse dahil edilen ‘Pseudosabinia’ rtanjica (Pejović), ‘Pseudosabinia’ serbica (Kühn & Pejović), ‘Pseudosabinia’ rtanjica triangularis (Karacabey) ve ‘Pseudosabinia’ rtanjica tunisiensis (Philip) gibi diğer türler ve alttürlerin, radolitid tip miyokardinal içermelerine karşın, tip türün tanımsal özelliği olan prizmatik yapılı sağ kavkı dış kavkı tabakasının eksikliği, Pseudosabinia ‘nın tanımlamasındaki bazı taksonomik sorunları işaret eder. Ayrıca, ‘Pseudosabinia’ rtanjica triangularis (Karacabey) alt türünün sağ kavkısı da bilinmemektedir. Sorunlu bu türler ve alt türlerin büyük bir olasılıkla Radiolitidae’nin diğer bir cinsine ait olabilirler; ancak yeni bir takson oluşturulurken ayrıntılı çalışmaya gereksinim vardır. Sabinia ornata Özer & Fenerci türü, cinsin tüm özelliklerini içermesi nedeniyle bu çalışmada Pseudosabinia cinsine dahil edilmiştir.

Türkiye’de bulunan Kampaniyen−Mastrihtiyen Pseudosabinia’ları: tanımlama ve taksonomik sorunlar

Specimens of taxa assigned to PseudosabiniaMorris & Skelton, collected from the Campanian–Maastrichtian sequences of different regions of Turkey such as the Kocaeli Peninsula, Amasya, Bayburt (Pontides), Sivas, Malatya, Elazığ (eastern Anatolian platform) and Kahta-Adıyaman and Yaylaçiftliği-Antakya (northernmost part of the Arabian platform), are determined and the taxonomic statuses of the species are discussed. Pseudosabinia klinghardti (Böhm) uniquely presents all the characteristic features of the genus. Other species and subspecies assigned to the genus ‘Pseudosabinia’ rtanjica (Pejović), ‘Pseudosabinia’ serbica (Kühn & Pejović), ‘Pseudosabinia’ rtanjica triangularis (Karacabey) and ‘Pseudosabinia’ rtanjica tunisiensis (Philip) lack the cellular prismatic structure of the outer shell layer in the right valve – a characteristic feature of the type species – despite sharing with the latter a radiolitiform myocardinal apparatus, indicating some taxonomic problems about the definition of Pseudosabinia. Meanwhile, the right valve of ‘Pseudosabinia’ rtanjica triangularis (Karacabey) is unknown. These problematical species may belong to another genus of, most probably, Radiolitidae; but more detailed study is needed before a new taxon is created. Sabinia ornata Özer & Fenerci is here transferred to Pseudosabinia because it presents all of the generic characteristics.

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