[dinosaur] Brachychirotherium tracks from Late Triassic of Morocco

Ben Creisler
[email protected]


A new paper:

Abdelkbir Hminna, Hendrik Klein, Tariq Zouheir, Abdelouahed LagnaouiORCID
Icon, Hafid Saber, Jens N. Lallensack & Mostafa Oukassou (2019)
The Late Triassic archosaur ichnogenus Brachychirotherium: first complete
step cycles from Morocco, North Africa, with implications for trackmaker
identification and ichnotaxonomy
Historical Biology (advance online publication)
doi: https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1080_08912963.2019.1658097&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=5_qVj6hLMWFcILKU1oX4fJj2gvAhbIWaBuYK4MvTYN8&s=lSoRO1NHc9xQa8zMMvceeqrXy73LhB0AdHEFkEX-xvc&e= 
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.tandfonline.com_doi_full_10.1080_08912963.2019.1658097&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=5_qVj6hLMWFcILKU1oX4fJj2gvAhbIWaBuYK4MvTYN8&s=gZxpIN4s6x8jjZ0PJnu-HPhvcuCk0e82kdupkX_B2Ts&e= 


Complete trackways of the Late Triassic archosaur ichnogenus
Brachychirotherium are extremely rare and thus far mostly known from North
America, though isolated imprints are abundant. Complete step cycles have
been found on the upper and lower bedding surfaces in laminated mudstones
and fine-grained sandstones of the lowermost part of the Machraa Abbass
Member of the Oued Oum Er Rbiaa Formation (Late Triassic). This is the
first complete trackway of the ichnogenus in North Africa. The tetrapod
footprints are assigned to B. parvum and B. thuringiacum, based on the
presence of diagnostic features of these ichnospecies, such as the
orientation of pedal digit V. Supposed trackmakers are archosaurs of the
crocodile stem-group (Crurotarsi) that were widely spread over the Triassic
Pangea. Associated tetrapod ichnofauna from the unit consists of
small-sized Rhynchosauroides (archosauromorph/lepidosauromorph) tracks.

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