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Submitted on
May 27, 2013
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50 (who?)
Unnamed Lourinha Brachiosaur by Paleo-King Unnamed Lourinha Brachiosaur by Paleo-King
Brachiosauridae incertae sedis, likely basal end of clade (cf. "Atlasaurinae")

Time horizon: Late Jurassic, Kimmeridgian to Tithonian epochs (~157-145 mya)

Length: ~15m (~50 ft.), perhaps more depending on maturity.

Probable mass: 17+ tons

An as-of-yet undescribed cousin of Atlasaurus… from the Lourinhã formation in Portugal. This species has the same very slender, elongated arms but much bulkier hands, with very thick metacarpals resembling cinderblocks…. The thumb claw is large but much closer to the ground that it would have been in Atlasaurus, due to the longer thumb metacarpal. The specimen is on display in Bristol, England.…

A naturally occurring 3D cast of a sauropod hand from the same geological formation and locale may be from this same animal.… . The shape of the cast indicates a very robust hand with the metacarpals arranged in a nearly circular form, with only the rearmost part of the hand hollowed out. This is common in macronarians, especially in brachiosaurs.

This still-unnamed brachiosaur is far closer to Atlasaurus than anything else. It's also a younger species, and may represent a radiation of Atlasaurus's descendants or close relatives into Portugal later in the Jurassic. Along with Atlasaurus it occupies a basal position in Brachiosauridae, and probably forms a neat little Atlasaurinae with Europasaurus as sister group. As for the mysterious sauropod's proportions, judging by the nearly identical arm segment ratios, they were probably not that different from Atlasaurus, though the unnamed animal is a bit smaller. (If I were a certain field guide author, I might even be tempted to lump the two together, despite the unnamed animal being millions of years more recent and from a different continent and geological formation :XD:).
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Algoroth Featured By Owner Jun 15, 2013  Professional General Artist
Her name is Laura! Unnamed, indeed!
TitanoRex Featured By Owner Jun 3, 2013
and just like that Europasaurus made sense
TyrannosaurusPrime Featured By Owner May 28, 2013
Never heard about this guy before.... :O
Paleo-King Featured By Owner May 29, 2013  Professional Traditional Artist
But you've probably seen him...
TyrannosaurusPrime Featured By Owner May 29, 2013
Must have forgotten about him then :p
T-PEKC Featured By Owner May 28, 2013
Nice! Too bad we have no info on the neck anatomy to tell us more about the overall proportions in relation to Atlasaurus.

Lourinha seems pretty rich in sauropods anyway. That's always a good thing.
Now Atlasaurus is less of an oddball now!
RajaHarimau98 Featured By Owner May 27, 2013  Hobbyist Traditional Artist
Is it weird I find this brachiosaur adorable?
Paleo-King Featured By Owner May 29, 2013  Professional Traditional Artist
Naah. I find brachiosaurs in general adorable :XD:. And also euhelopodids and maybe a few titanosaurs.
RajaHarimau98 Featured By Owner May 29, 2013  Hobbyist Traditional Artist
Ah, that is true. I bet it's their cheeky little smiles - they look so happy to see you.
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