Macroplacus

Macroplacus is an extinct genus of placodont reptiles.[1] The type species is M. raeticus[2] and the fossil record of this species dates back to the upper Triassic, Rhaetian age (age range: 205.6 to 201.6 million years ago). These fossils have been found in Germany, at Hinterstein near Hindelang im Allgäu.[1]

Fossil skull of Macroplacus raeticus

Macroplacus
Temporal range: Late Triassic, 205.6–201.6 Ma
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Fossil with teeth of Macroplacus raeticus from Triassic of Germany
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Superorder:
Sauropterygia
Order:
†Placodontia
Superfamily:
†Cyamodontoidea
Family:
†Cyamodontidae
Genus:
†Macroplacus

Schubert-Klempnauer, 1975
Binomial name
†Macroplacus raeticus
Schubert and Klempnauer, 1975

Taxonomy

The classification of Macroplacus is controversial [3] but it is usually placed in the Cyamodontidae or in the Placochelyidae. These reptiles are placodonts, a group of animal probably related to diapsids, but that look similar to the turtles. Macroplacus, in particular, was a representative of cyamodontoidea, characterized by heavy armor and narrow snouts.[4]

Description

Macroplacus raeticus, the only known species, had to possess a relatively flat body, quite armored and similar to that of a turtle. The skull was very robust, broad posteriorly, with a snout narrower in the foremost part. The jaws were exceptionally strong and probably had a powerful musculature. The teeth were present on the palate and jaw, and were round shaped, with huge molars. The whole animal was about 1 metre (3.3 ft) long when fully grown.[4]

Biology

It was an animal with an amphibious way of life, but it was little adapted to marine life. Like all placodonts, Macroplacus had to swim slowly in shallow water and coastal areas, in search of shellfish that made up most of its diet. The large palatal hemispheric teeth could break the shells of mollusks.[2][4]

References
  1. Paleobiology Database
  2. Schubert-Klempnauer, H., 1975, Macroplacus raeticus n. g. n. sp.-ein neuer Placodontier aus dem Rat der Bayerischen Alpen: Mitteilungen der Bayerischen Staatssammlung fur Palaontologie und historishce Geologie, v. 15, p. 33-55.
  3. Biolib
  4. Rieppel, O., 2000, Sauropterygia I, placodontia, pachypleurosauria, nothosauroidea, pistosauroidea: In: Handbuch der Palaoherpetologie, part 12A, 134pp.
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