Is Acarinina multicamerata a new species of Acarinina start to occur within the lower Eocene Zone E1 according to Guasti and Speijer (2008)? or is it a transitional form of Acarinina sibaiyaensis according to Ouda (2018)?
Thanks for your comment but there are arguments in Ouda, 2018 concerning A. multicamerata as a new sp. of Gausti and Spijer 2008. Please, kindly have a look to attached paper. I am very interesting in your next comments.
According to Patterson et al (2004), they placed both Ac africana & Ac sibaiyaensis within the lower part of Thanetian (lower portion of P5), therefore it is being, logically, that FO of Ac multicamerata occur Lower Eocene E1.