Образцы
1 a,b,c и 2 a,b - из моей коллекции, Марокко и Киев;
3 и 4 - из сайтов somniosus.be и J-elasmo соответственно.
Этот род известен больше из миоцена и олигоцена с видом P.benedini, но эоценовые находки тоже известны.
Цитаты из Эласмо:
Menner (1928: 337) described the new species Otodus pavlovi for teeth from the Ypresian (Early Eocene) of western Kazakhstan. The teeth were briefly described as small, bearing lateral cusplets and a well-developed root. Zhelezko & Kozlov (1999:157) moved pavlovi to Parotodus. Collectors have attributed similar teeth from the London Clay to this taxon, however this has never been published.

Zhelezko & Kozlov (1999b:156-57) erected the species Parotodus mangyshlakensis for cuspleted Parotodus-like teeth from the Middle/Late Eocene Schorym Formation in Mangyshlak, Kazakhstan. They described them as larger and with a broader, more massive, crown than P. pavlovi and less so than P. benedeni; they considered it a transitional form between the two.

*Parotodus magyshlakensis - фото 4

Далее...

Siverson & Lindgren (2005: 307) shed more light (or should I say shadows) on this topic while discussing Late Cretaceous sharks from Montana. Their arguments were perfectly clear to me, but their comments regarding Parotodus and CARDABIODONTIDAE include:
- It is difficult to prove that Parotodus is a cardabiodontid because of the lengthy gap (Late Turonian to Early Rupelian) in the fossil record).
- Teeth attributed to Parotodus mangyshlakensis may represent a non-Parotodus taxon and that Leriche's (1910: plate 16) illustrated P. benedini specimens may be tainted (by a "heterogeneous mix") with the mangyshlakensis tooth-design (based on the root's lingual protuberance and lateral tooth cusplets).
- The Early Eocene tooth-design from Morocco referred to as "Parotodus sp" may be erroneously placed in that genus, based on apicobasal neck width

И как тогда быть?

Таких "марокканцев" у меня есть еще несколько штук, я просто выбрал самый показательный. Кстати, интересно, что мой киевский зуб очень сильно напоминает бельгийские, в особенности на фото 3.

Ключевые слова (тэги): зубы, Марокко, акулы, Казахстан, зубы акул, Elasmobranchii, Киев, Parotodus, teeth, shark teeth, sharks