Name: Haptodus ‭(‬Gentle teeth‭)‬.
Phonetic: Hap-toe-dus.
Named By: Gaudry‭ ‬-‭ ‬1886.
Synonyms: Callibrachion Datheosaurus,‭ ‬Palaeohatteria,‭ ‬Pantelosaurus.
Classification: Chordata,‭ ‬Synapsida, ‭Pelycosauria, ‬Sphenacodontia.
Species: H.‭ ‬baylei‭ (‬type‭)‬.‭ ‬Possibly also H.‭ ‬garnettensis,‭ ‬H.‭ ‬gaudryi,‭ ‬H.‭ ‬grandis,‭ ‬H.‭ ‬macrourus.
Diet: Insectivore/Carnivore.
Size: Between‭ ‬70‭ ‬and‭ ‬150‭ ‬centimetres long depending upon the species.‭ ‬Smaller species such as H.‭ ‬garnettensis about‭ ‬70‭ ‬centimetres,‭ ‬while larger species like H.‭ ‬baylei about‭ ‬140‭ ‬centimetres long.
Known locations: England‭ ‬-‭ ‬Kenilworth Sandstone Formation.‭ ‬France.‭ ‬Germany‭ ‬-‭ ‬Döhlen Formation,‭ ‬Niederhäslich-Schweinsdorf Formation.‭ ‬Poland‭ ‬-‭ ‬Ludwikowice Formation.‭ ‬USA,‭ ‬Kansas‭ ‬-‭ ‬Stanton Formation.
Time period: ‭K‬asimovian of the Carboniferous through to the Sakmarian of the Permian.
Fossil representation: Several individuals.

       Easily one of the more common pelycosaurs in Europe,‭ ‬Haptodus was also‭ ‬one of the earliest with the first species appearing in the late Carboniferous period.‭ ‬Earlier species that appeared in the‭ ‬Carboniferous such as H.‭ ‬garnettensis were smaller at about seventy centimetres in length and were probably‭ ‬insectivores.‭ ‬By the early Permian however,‭ ‬species such as H.‭ ‬baylei were growing twice as big and probably incorporated small vertebrates into their diets as well.‭ ‬However,‭ ‬in recent years there have been some doubts to the validity of some of the species,‭ ‬which might result in some re-naming in the future.

Further reading
-‭ ‬Lower Permian Pelycosaurs from the English Midlands.‭ ‬-‭ ‬Palaeontology‭ ‬17‭(‬3‭)‬:541-552.‭ ‬-‭ ‬R.‭ ‬L.‭ ‬Paton‭ ‬-‭ ‬1974.
-‭ ‬A New Haptodontine Sphenacodont‭ (‬Reptilia:‭ ‬Pelycosauria‭) ‬from the Upper Pennsylvanian of North America.‭ ‬-‭ ‬Journal of Paleontology‭ ‬51‭(‬5‭)‬:927-942.‭ ‬-‭ ‬P.‭ ‬Currie‭ ‬-‭ ‬1977.
- Anatomy and relationships of Haptodus garnettensis, a Pennsylvanian synapsid from Kansas. - Journal of Vertebrate Paleontology. 13 (2): 200–229. - M. Laurin - 1993.


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