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Round One: Bagualosaurus vs Issi

Bagualosaurus (left) or Issi (right)?

Bagualosaurus

Issi

Voting ended onMar 9, 2023

Factfiles:

Bagualosaurus agudoensis

Artwork by @i-draws-dinosaurs, written by @i-draws-dinosaurs

Name meaning: Strongly built reptile from Agudo (from regional usage of “bagual” in southern Brazil to mean a well built but crude person)

Time: ~230 million years ago (Carnian stage of the Late Triassic)

Location: Candelária sequence, Upper Santa Maria Formation, Brazil

Although most famous for their enormous size, the sauropodomorphs began as little scurrying bipeds like all other dinosaurs. It wasn’t long though before they started packing on the beef amd shooting for size and power, and Bagualosaurus marks the beginning of that shift. It was still small, only a little over 2 metres long, but its skeleton shows some of the first signs of bulking up, hence its name! Its legs in particular are more robust than the earliest sauropodomorphs, and its skull is starting to show similarities to later and larger Triassic sauropodomorphs like Plateosaurus. Bagualosaurus is the biggest dinosaur described from its ecosystem so far, but it was still very much in the shadow of larger reptiles and synapsids, with a lot of growing left to do!

Issi saaneq

Artwork by @i-draws-dinosaurs, written by @i-draws-dinosaurs

Name meaning: Cold bones

Time: 225 million years ago (Norian stage of the late Triassic)

Location: Fleming Fjord Formation, Greenland Issi made its debut in 2021 as the first non-avian dinosaur species to be named from Greenland! However, the fossils now known as Issi have been known for a while, being excavated during the early 1990s and assigned to the well-known Plateosaurus engelhardti. Further study revealed features of the skull that were, strangely, much closer to those of South American plateosaurids rather than the European Plateosaurus, justifying its classification as a new genus and species! Issi is currently described from two nearly complete skulls, an adult and a juvenile, but three more specimens found in 2012 still have yet to be described. There are potentially further interesting developments in the future for Issi!

DMM Round One Masterpost

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@darkmetaknightspussy

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“name: Apple Scott age: 24 dream: Becoming a popstar”

played by lu_mpy on the French GTA RP server FailyV Original character fan-art I'm not used to paint with pink hues ! It was so refreshing !

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Issi saaneq Beccari et al., 2021 (new genus and species)

(Digital reconstruction of the type skull of Issi saaneq, from Beccari et al., 2021)

Meaning of name: Issi = cold; saaneq = bone

Age: Late Triassic (Norian), 214 million years ago

Where found: Malmros Klint Formation, Sermersooq, Greenland

How much is known: Nearly complete skulls from two individuals. Additional material including other parts of the skeleton has been found, but has not yet been scientifically described.

Notes: Issi was an early sauropodomorph, probably closely related to Plateosaurus from the Late Triassic of continental Europe. In fact, the type specimen of Issi was originally considered an individual of Plateosaurus when briefly described in 1994. More detailed study, however, shows that it exhibits some notable differences from Plateosaurus and other early sauropodomorphs, including in the proportions of several skull bones and the presence of a small opening on the inner surface of the bone near the tip of its snout. Issi represents the northernmost record of a sauropodomorph so far.

Based on comparison to early sauropodomorphs with more completely known growth series, one of the two skulls that have been described from Issi probably belonged to an early-stage juvenile, whereas the other may have been from an older juvenile or a young adult.

Reference: Beccari, V., O. Mateus, O. Wings, J. Milàn, and L.B. Clemmensen. 2021. Issi saaneq gen. et sp. nov.—a new sauropodomorph dinosaur from the Late Triassic (Norian) of Jameson Land, central East Greenland. Diversity 13: 561. doi: 10.3390/d13110561

#Palaeoblr #Dinosaurs #Issi #Late Triassic #North America #Sauropodomorpha #2021 #Extinct