Temporal range: Early Cretaceous–Paleocene
Osteopygis emarginatus carapace
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Clade: Pantestudines
Clade: Perichelydia
Family: Macrobaenidae
Sukhanov, 1964

Macrobaenidae is an extinct family of turtles, known from the Early Cretaceous to Paleogene of Laurasia. Their relationships to other turtles and whether or not they form a monophlyletic group are controversial. Initially they were intepreted as stem or crown group cryptodires, but some more recent analyses have found them to lie outside crown group Testudines. Macrobaenids can be distinguished from other testudinatans by the presence of a carotid fenestra, cruciform plastron with strap-like epiplastra, and a lack of extragulars.[3]


Hongkongochelys from the Middle-Late Jurassic of China has sometimes been attributed to the family,[2] but other times has been attriuted to Sinemydidae, a group which has an unresolved relationship with Macrobaenidae.


  1. ^ a b c d e f g h i j k l m n "Macrobaenidae". FossilWorks. Retrieved 17 December 2021.
  2. ^ a b c Adán Pérez-García (2020). "A European Cenozoic 'Macrobaenid:' New Data about the Paleocene Arrival of Several Turtle Lineages to Europe". Journal of Vertebrate Paleontology. Online edition: e1795874. doi:10.1080/02724634.2020.1795874.
  3. ^ Joyce, Walter G.; Anquetin, Jérémy; Cadena, Edwin-Alberto; Claude, Julien; Danilov, Igor G.; Evers, Serjoscha W.; Ferreira, Gabriel S.; Gentry, Andrew D.; Georgalis, Georgios L.; Lyson, Tyler R.; Pérez-García, Adán (December 2021). "A nomenclature for fossil and living turtles using phylogenetically defined clade names". Swiss Journal of Palaeontology. 140 (1): 5. doi:10.1186/s13358-020-00211-x. ISSN 1664-2376.