Size comparisons

[DinoFan83]

*This image is copyright of its original author

Nowadays, size comparisons featuring a number of giant and famous predatory dinosaurs are very popular. However, in these types of comparisons, the most popular of the theropods (eg: T. rex, Spinosaurus, Giganotosaurus) tend to 'hog' the spotlight from less well known but just as large taxa (such as the ones featured here).
And as such, I present a size chart of 8 rather obscure but very good sized predatory dinosaurs that are every bit as large as (if not sometimes larger than) and just as deserving of the spotlight as the more famous species. 
Clockwise from top left, the species in the chart are as follows.

Bahariasaurus ingens - IPHG 1912 VIII 62c

Restored as a basal tyrannosauroid (Yutyrannus base specifically), this animal ends up at 14+ meters and 8+ tonnes based on the posterior dorsals of a 7 meter long, 1 tonne Yutyrannus (follwing SpinoInWonderland's modified Yutyrannus GDI) sized up to the 22.5 cm measurement given by Mickey Mortimer.
Note that this may also be an allosauroid, megalosauroid, or ceratosaur, but would still be very big.

Sauroniops pachytholus - MPM 2594

A very little known carcharodontosaurid that is quite possibly among the largest known theropods of all. The frontal is at least as large as that of SGM-DIN 1 (meaning that Sauroniops was likely somewhere in the 13-13.7 meter and 9-9.8 tonne range going by my estimations), but to minimize extrapolating from an extrapolation in and of itself, Giganotosaurus was used as a base.
Here, this is a 13.3 meter animal massing about 9.3 tonnes based on the figures SpinoInWonderland has given me for his skeletal used here.

Tratayenia rosalesi - MCF-PVPH 418

As was discussed here, this is very likely the biggest megaraptoran specimen we have so far, at an estimated 13.6 meters long and 8.9 tonnes. I am not surprised of this specimen's obscurity considering that not a lot has been found and not a lot has been very extensively figured, but I do think it deserves more recognition.
Note, however, that the arms were almost certainly a lot bigger than shown in the megaraptoran composite skeletal used here.

Deltadromeus agilis - lost giant femur

This one comes out quite a bit larger than most think. Our largest specimen, mentioned in Ibrahim et al. 2020, is a lost giant femur 144 cm long. Quite substantially larger than the 74 cm femur of SGM-DIN 2, this specimen ends up 15.57 meters long and 8.1 tonnes based on the estimate of 8 meters and 1.1 tonnes for SGM-DIN 2 in Seebacher et al. 2001.
Note, however, that here I have chosen to go the route of Deltadromeus being a basal tyrannosauroid, which the original skeletal from Sereno depicts. It's also possible it could be a ceratosaur, as per PWNZ3R-Dragon's skeletal.

Unnamed giant Tendaguru carcharodontosaurid

As stated in this blog post, there is a rather large fibula from the Tendaguru of a seemingly unnamed species of carcharodontosaurid, and it is 91 centimeters long. This is suggestive of an animal approaching the size of some of the later Cretaceous carcharodontosaurids (famous for their giant size). I had chosen Acrocanthosaurus as a base because it is one of the most complete of the basal carcharodontosaurids, and using it as a base for this giant fibula, the owner of the bone seems to end up in the region of 6.5-7 tonnes for mass. 

Mystery Bahariya theropod fibula - IPHG 1912 VIII 70

One of Stromer's destroyed discoveries, this is a large theropod fibula 115 cm long, which could belong to Deltadromeus, Bahariasaurus, or an unnamed species of allosauroid, ceratosaurid, or megalosauroid. It is tentatively restored as a ceratosaur here based on Gualicho, which yields a mass of 3-3.5 tonnes or so based on eyeballing and isometry of other ceratosaurs.

Giant Tendaguru megalosauroid ('Allosaurus' tendagurensis) tibia

Discussed previously elsewhere, there is a giant megalosauroid tibia from the Tendaguru, that may be a more familiar form. Here, it is based on Torvosaurus/a composite megalosaurid skeletal, and the 110 cm estimate was used. The skeletal that was used here as a base for it yields lengths of over 12.5 meters and a mass of about 5-6 tonnes.
This may belong to Torvosaurus, although that is not certain at this time. It does, however, show that megalosaurids were doing quite well in Jurassic Africa, achieving surprisingly large sizes.

Unnamed giant São Paulo abelisaurid - URC R 44

This animal is probably our best evidence for giant abelisaurids at the moment. Its skull is estimated at 120 cm long, and assuming similar proportions to an abelisaurid composite of Abelisaurus/Aucasaurus, it's about 12.2 meters long. Mass is probably in the region of 7.5-8 tonnes.

All unspecified masses based on the size estimations for the used skeletals from Greg Paul and SpinoInWonderland. Reply