Mary River turtle
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The Mary River turtle is an endangered species of short-necked turtle in the family Chelidae. The species is endemic to the Mary River in south-east Queensland, Australia. Although this turtle was kno
Elusor macrurus 76801512
In Graz, Austria
Adult male. Note the large tail.
Basking in Queensland, Australia
Haemal arch
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A haemal arch, also known as a chevron, is a bony arch on the ventral side of a tail vertebra of a vertebrate. The canal formed by the space between the arch and the vertebral body is the haemal canal
Mary River turtle
…which can measure almost two-thirds of the carapace length. Also unusual is that the tail is laterally compressed like a paddle. The tail also has haemal arches, a feature lost in all other Australian chelids. While haemal arches are documented in many cryptodiran species (including big-headed, common snapping…
Haemal arch series of Oksoko and Rinchenia.