Phylogeny of the Middle Cretaceous (Late Albian-Late Cenomanian) Planktonic Foraminiferal Genera Parathalmanninella Nov. Gen. And Thalmanninella

Abstract

The recently emended planktonic foraminifera Thalmanninella is polyphyletic. It includes two lineages that evolved from different ancestors and developed independently. Parathalmanninella nov. gen. is proposed to accommodate species characterized by the presence of petaloid chambers and slightly curved, raised sutures on the spiral side, triangular chambers and radial, depressed chambers on the umbilical side and a small umbilicus. Parathalmanninella includes the following species: Parathalmanninella praebalernaensis (its type species), Parathalmanninella balernaensis, Parathalmanninella appenninica, Parathalmanninella micheli and Parathalmanninella gandolfii. This genus evolved from Ticinella raynaudi. Thalmanninella is re-described in order to include species characterized by chambers that are crescentic on the spiral side and trapezoidal on the umbilical side with curved, raised sutures on both sides of the test, periumbilical ridges, a large umbilicus and a cover-plate. Thalmanninella includes the following species: Thalmanninella brotzeni (its type species), Thalmanninella globotruncanoides, Thalmanninella greenhornensis, Thalmanninella reicheli, Thalmanninella deeckei and Thalmanninella multiloculata.It is suggested that Thalmanninella evolved from Pseudothalmanninella tehamaensis.

Upper Cretaceous planktic foraminiferal biostratigraphy

“…The genera defined for the practical classification associated with the evolutionary classification are thoroughly used in the development of the actual biostratigraphical framework. Georgescu (2015), (**) after Loeblich and Tappan (1987) with additional genera from Korchagin (2003) and Lipson-Benitah (2008).…”

Remarks on the identification of the Albian/Cenomanian boundary and taxonomic clarification of the planktonic foraminifera index speciesglobotruncanoides, brotzeniandtehamaensis

“…The working group has published results in the peer-reviewed literature (e.g. Petrizzo & Huber, 2006 a , b ; Ando & Huber, 2007; Caron & Premoli Silva, 2007; Gonzalez-Donoso, Linares & Robaszynski, 2007; Georgescu & Abramovich, 2008; Lipson-Benitah, 2008; Spezzaferri & Caron, 2008; Georgescu & Huber, 2009; Georgescu, Saupe & Huber, 2009; Premoli Silva et al 2009; Falzoni & Petrizzo, 2011; Huber & Leckie, 2011; Petrizzo, Falzoni & Premoli Silva, 2011; Petrizzo et al 2012, 2013; Ando, Huber & Premoli Silva, 2013; Falzoni et al 2014; Huber & Petrizzo, 2014; Haynes, Huber & MacLeod, in press, among others) and has built an online taxonomic database posted on the CHRONOS website ().…”

“…The stratigraphic interval from the middle Albian to the upper Cenomanian records the evolution and diversification of the polyphyletic Rotalipora group (Wonders, 1978; Robaszynski et al 1994, 2008; Kennedy et al 2004; Gonzalez-Donoso, Linares & Robaszynski, 2007; Gale et al 2011). The distinctive rotaliporid assemblage that occurs at the base of the Cenomanian is composed of trochospiral, single-keeled species with supplementary apertures on the umbilical side that have been assigned to two different genera: (1) Pseudothalmanninella ( ticinensis, tehamaensis ), and (2) Thalmanninella ( appenninica, balernaensis, gandolfii, brotzeni, globotruncanoides ) (see Wonders, 1978, 1980 and discussion in Gonzalez-Donoso, Linares & Robaszynski, 2007 and Lipson-Benitah, 2008). The genera assignment is based on the identification of distinctive lineages that originated in late Albian time, as follows: (1) Ticinella praeticinensis – Pseudothalmanninella subticinensis – Pseudothalmanninella ticinensis – Pseudothalmanninella tehamaensis lineage; (2) Ticinella raynaudi group: Thalmanninella praebalernaensis – Thalmanninella balernaensis – Thalmanninella appenninica – Thalmanninella brotzeni – Thalmanninella globotruncanoides lineage.…”

Upper Cretaceous volcanoclastic-sedimentary formations in the Timok Eruptive Area (eastern Serbia): new biostratigraphic data from planktonic foraminifera

“…2). It was first described as Albian "Lenovac Beds" by Andjelković & Antonijević (1975 González-Donoso et al (2007) and Lipson-Benitah (2008) is adopted in this study, although Gale et al (2011) suspect that the genus Thalmanninella may be polyphyletic) zonal species Thalmanninella reicheli and Rotalipora zonal species Rotalipora cushmani are identified suggesting a Middle and Late Cenomanian age.…”