Anaschisma

Name: Anaschisma.
Phonetic: An-ah-schis-mah.
Named By: Branson‭ – ‬1905.
Synonyms: Anaschisma brachygnatha,‭ ‬Borborophagus,‭ ‬Buettneria bakeri,‭ ‬Buettneria perfecta,‭ ‬Koskinonodon,‭ ‬Metoposaurus bakeri.
Classification: Chordata,‭ ‬Amphibia,‭ ‬Temnospondyli,‭ ‬Stereospondyli,‭ ‬Metoposauridae.
Species: A.‭ ‬browni‭ (‬type‭)‬.
Diet: Carnivore/Piscivore.
Size: Skull‭ ‬65‭ ‬centimetres long.‭ ‬Body length up to‭ ‬3‭ ‬meters.
Known locations: USA‭ ‬-‭ ‬Arizona,‭ ‬New Mexico,‭ ‬Pennsylvania,‭ ‬Texas‭ & ‬Wyoming.
Time period: Norian of the Triassic.
Fossil representation: Partial remains of numerous individuals.




       Anaschisma is a genus of temnospondyl amphibian known to have lived in North America during the late Triassic.‭ ‬Anaschisma were primarily aquatic predators using their salamander-like bodies to swim through the water and navigate submerged obstacles in searching for prey.‭
       Anaschisma is regarded as a metoposaurid temnospondyl amphibian,‭ ‬which means that it is closest to genera such as Metoposaurus and Apachesaurus.‭ ‬These temnopondyls are noted for having eyes that were situated in a more forward position on their skulls than the eyes of other similar temnospondyl groups.‭ ‬Also like its relative genera,‭ ‬Anaschisma seems to have been more at home in the water where it probably hunted for fish and possibly other amphibians.‭ ‬The limbs are generally not that well supported for terrestrial locomotion,‭ ‬and the presence of a lateral line formed by sensory sulci would have detected changes in water pressure,‭ ‬allowing them to pick up upon the movements of nearby swimming animals.
       Further evidence for a mostly aquatic lifestyle can be inferred from collections of Anaschisma which can be interpreted as mass graves where a body of water dried out,‭ ‬leaving many Anaschisma exposed to the dry air.‭ ‬The remains of these Anaschisma are found so close together that they seem to have clustered together in the last remnants of water before death.‭ ‬This may have been the result of a body of water not being replenished by seasonal rain or flood water.
       Another genus of temnospondyl named Koskinonodon is now often regarded as synonymous with Anaschisma.‭ ‬This started way back in‭ ‬1947,‭ ‬back when the Anaschisma genus was actually named Buettneria.‭ ‬Preoccupation of the name Buettneria,‭ ‬saw the fossils renamed into a new genus called Koskinonodon in‭ ‬2007‭ (‬Mueller‭)‬.‭ ‬A subsequent re-description of these fossils in‭ ‬2019‭ (‬Gee‭ ‬et al‭) ‬again came to the conclusion that they are synonymous with the earlier named Anaschisma.

Further reading
-‭ ‬Structure and relationships of American Labyrinthodontidae.‭ ‬-‭ ‬Journal of Geology‭ ‬13:568-610.‭ ‬-‭ ‬E.‭ ‬B.‭ ‬Branson‭ ‬-‭ ‬1905.
-‭ ‬Koskinonodon Branson and Mehl,‭ ‬1929,‭ ‬a replacement name for the preoccupied temnospondyl Buettneria Case,‭ ‬1922.‭ ‬-‭ ‬Journal of Vertebrate Paleontology.‭ ‬27‭ (‬1‭)‬:‭ ‬225.‭ ‬-‭ ‬B.‭ ‬D.‭ ‬Mueller‭ ‬-‭ ‬2007.
-‭ ‬Redescription of Anaschisma‭ (‬Temnospondyli:‭ ‬Metoposauridae‭) ‬from the Late Triassic of Wyoming and the phylogeny of the Metoposauridae.‭ ‬-‭ ‬Journal of Systematic Palaeontology.‭ ‬18‭ (‬3‭)‬:‭ ‬233‭–‬258.‭ ‬-‭ ‬Bryan M.‭ ‬Gee,‭ ‬William G.‭ ‬Parker‭ & ‬Adam D.‭ ‬Marsh‭ ‬-‭ ‬2019.




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