MACROCOLLUM
an ancient unaysaurid sauropodomorph dinosaur from the Late Triassic of Brazil.
Pronunciation: MAK-row-COLL-um
Meaning: Long necked
Author/s: Müller (
2018)
Synonyms: None known
First Discovery: Rio Grande do Sul, Brazil
Discovery Chart Position: #998
Macrocollum itaquii
(Itaqui's long necked one)Etymology
Macrocollum is derived from Greek "makros" (long) and the Latin "collum" (neck). The
species epithet (or specific epithet),
itaquii, honours Mr José Jerundino Machado Itaqui, one of the main creators of CAPPA/UFSM (Centro de Apoio à Pesquisa Paleontológica da Quarta Colônia/Universidade Federal de Santa Maria).
Discovery
The first remains of
Macrocollum were discovered at the Wachholz site in the Caturrita Formation (upper Candelária Sequence, Paraná Basin), Aguda municipality, Rio Grande do Sul, Brazil, in 2012.
The
holotype (CAPPA/UFSM 0001a) is an almost complete and articulated skeleton. Paratypes from the same site include an almost complete and partially articulated skeleton (CAPPA/UFSM 0001b) and an articulated skeleton lacking the skull and neck (CAPPA/UFSM 0001c). A partial skull (CAPPA/UFSM 0001d) was found in close association with
the holotype and paratypes.
A partial left foot (CAPPA/UFSM 0327) from a site known as "Boi da Guampa Torta",
approximately 1 km from the Wachholz site on the
outskirts of Agudo, was referred to
Macrocollum by Fabiula Prestes de Bem and Rodrigo Temp Müller in 2023.
Preparator
Rodrigo Temp Müller.
Estimations
Timeline:
Era: Mesozoic
Epoch: Triassic
Stage: Norian
Age range: 226-225 mya
Stats:
Est. max. length: ?
Est. max. hip height: ?
Est. max. weight: ?
Diet: Herbivore
Unaysauridae
Macrocollum
itaquii
References
• Müller RT, da Rosa AAS, da Silva R, Aires L, Schiller AS, Pacheco CP, Pavanatto AEB and Dias-da-Silva S (August 2015) "Wachholz, a new exquisite dinosaur-bearing fossiliferous site from the Upper Triassic of southern Brazil".
Journal of South American Earth Sciences, 61: 120–128. DOI: 10.1016/j.jsames.2014.10.009.
• Müller RT, Langer MC and Dias-da-Silva S (2018) "An exceptionally preserved association of complete dinosaur skeletons reveals the oldest long-necked sauropodomorphs".
Biology Letters, 14(11): 20180633. DOI: 10.1098/rsbl.2018.0633.
• de Bem FP and Müller RT (2023) "First record of
Macrocollum itaquii (Dinosauria: Sauropodomorpha) outside the type locality and its biostratigraphic significance".
Historical Biology, 36(12): 1-14.
DOI: 10.1080/08912963.2023.2269404.
• Aureliano T, Ghilardi AM, Müller RT, Kerber L, Fernandes MA, Ricardi-Branco F and Wedel MJ (2023) "The origin of an invasive air sac system in sauropodomorph dinosaurs".
The Anatomical Record, Special Issue: The Dawn of an Era: Comparative and Functional Anatomy of Triassic Tetrapods, 307(4): 1084-1092. DOI: 10.1002/ar.25209.
• Fonseca AO, Bem FP and Müller RT (2025) "Osteology of the appendicular skeleton of
Macrocollum itaquii (Dinosauria: Sauropodomorpha) sheds light on early dinosaur wrist evolution".
Zoological Journal of the Linnean Society, 205(1): zlaf100.
DOI: 10.1093/zoolinnean/zlaf100.
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To cite this page:
Atkinson, L.
"
MACROCOLLUM :: from DinoChecker's dinosaur archive".
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http://www.dinochecker.com/dinosaurs/MACROCOLLUM›. Web access: 06th Mar 2026.
