Romualdo Formation

Irritator is a genus of spinosaurid dinosaur that lived in what is now Brazil during the Albian stage of the Early Cretaceous Period, about 113 to 110 million years ago. It is known from a nearly complete skull found in the Romualdo Formation of the Araripe Basin. Fossil dealers had acquired this skull and sold it to the State Museum of Natural History Stuttgart. In 1996, the specimen became the holotype of the type species Irritator challengeri. The genus name comes from the word "irritation", reflecting the feelings of paleontologists who found the skull had been heavily damaged and altered

extinct genus of pterosaurs

Tupuxuara is a genus of thalassodromid pterosaur that lived during the Albian age of the Early Cretaceous, about 112 million years ago. Its remains were found in what is now the Romualdo Formation of the Santana Group in Brazil. Tupuxuara was named in 1988 by paleontologists Alexander Kellner and Diógenes de Almeida Campos. The name Tupuxuara means "familiar spirit" referring to a familiar spirit in the mythology of the Tupi people in Brazil. Two species have been named, T. longicristatus, the type species, and T. leonardii. An additional species has been named in 2009, T. deliradamus. However

Thalassodromeus is a genus of pterosaur that lived in what is now Brazil during the Early Cretaceous period, about a hundred million years ago. The original skull, discovered in 1983 in the Araripe Basin of northeastern Brazil, was collected in several pieces. In 2002, the skull was made the holotype specimen of Thalassodromeus sethi by palaeontologists Alexander Kellner and Diogenes de Almeida Campos. The generic name means "sea runner" (in reference to its supposed mode of feeding), and the specific name refers to the Egyptian god Seth due to its crest being supposedly reminiscent of Seth's

thumb|right|Rhinobatos hakelensis fossil

Tropeognathus (meaning "keel jaw") is a genus of large pterosaurs from the late Early Cretaceous of South America. This genus is considered to be a member of the family Anhangueridae, but several studies have also recovered it within another family called Ornithocheiridae. Both of these families are diverse groups of pterosaurs known for their keel-tipped snouts and large size. With an estimated wingspan around , Tropeognathus is regarded as the largest pterosaur found in the Southern Hemisphere, only rivaled by the huge azhdarchids. The type and only species is Tropeognathus mesembrinus. Foss

Santanaraptor (meaning "Santana Formation thief") is a genus of coelurosaurian theropod dinosaur that lived in South America during the Early Cretaceous (late Aptian-early Albian), about 112 million years ago.

Cearadactylus is an extinct genus of large anhanguerid pterosaur from the Early Cretaceous (Albian age) Romualdo Formation of Brazil. The only known species is C. atrox, described and named in 1985 by Giuseppe Leonardi and Guido Borgomanero. The name refers to the Brazilian state Ceará, and combines this with Greek daktylos, "finger", a reference to the wing finger of pterosaurs. The Latin atrox means "frightful", a reference to the fearsome dentition of the species.

Mirischia is an extinct genus of coelurosaurian theropod dinosaur from the Albian stage (Early Cretaceous Period) of northeastern Brazil.

Lepidotes (from , 'covered with scales') (previously known as Lepidotus) is an extinct genus of Mesozoic ray-finned fish. It has long been considered a wastebasket taxon, characterised by "general features, such as thick rhomboid scales and, for most of the species, by semi-tritorial or strongly with dozens of species assigned to it. Fossils attributed to Lepidotes have been found in Jurassic and Cretaceous rocks worldwide. It has been argued that Lepidotes should be restricted to species closely related to the type species L. gigas, which are only known from the Early Jurassic of Western and

Araripesaurus is a potentially dubious genus a pterosaur belonging to the suborder Pterodactyloidea, it was discovered in the Romualdo Formation of the Santana Group in northeastern Brazil, which dates back to the Aptian and Albian of the Early Cretaceous. The type species is A. castilhoi.

Aratasaurus is an extinct genus of basal coelurosaurian theropod dinosaur from the Early Cretaceous (Aptian) Romualdo Formation of Brazil. The genus contains a single species, A. museunacionali, known from a partial right leg. Aratasaurus represents the only tetrapod fossil known from the lower levels of the Romualdo Formation.

Brasileodactylus is an extinct genus of anhanguerian pterosaur from the Early Cretaceous (Aptian age) lower Santana Formation of Chapada do Araripe, Ceará, Brazil.

Araripedactylus is a potentially dubious genus of pterodactyloid pterosaur, known from a single wing bone found in the Early Cretaceous Santana Formation of Brazil.

Santanadactylus (meaning "Santana Formation finger") is a potentially dubious genus of pterodactyloid pterosaur from the Albian-aged Romualdo Member of the Early Cretaceous Santana Formation, of Barra do Jardim, Araripe Plateau, Ceará State, Brazil. Four species have been named, but today are not considered congeneric with each other. It was a rather large pterosaur.

geologic fossil accumulation in northeastern Brazil's Araripe Basin

Unwindia is a genus of pterodactyloid pterosaur from the Early Cretaceous period (Albian stage) of what is now modern-day Brazil.

Maaradactylus is a genus of anhanguerid pterodactyloid pterosaur known from the Lower Cretaceous period (Aptian to Albian stages) of the Romualdo Formation of northeastern Brazil.

Barbosania is an extinct genus of crestless targaryendraconian pterosaur from the Cretaceous Romualdo Formation of the Santana Group of northeastern Brazil, dating to the Aptian to Albian.

Santanachelys gaffneyi is an extinct species of sea turtle. It is the only species in the genus Santanachelys, which itself is a member of the extinct family Protostegidae. The species was first described from a 20-centimeter long fossil specimen unearthed in 1998 from the Santana Formation of eastern Brazil. From the rock layer from which it was excavated, it was determined that the specimen was from the Early Cretaceous period (112 million years old). It is therefore one of the oldest known sea turtles. but a new fossil named Desmatochelys padillai in 2015 is estimated to be as old as 120 mi

Rhacolepis is an extinct genus of ray-finned fish from the Cretaceous Romualdo Formation of Brazil. Complete fossilised hearts from this species have been recovered.thumb|R. buccalis skull|leftleft|thumb|Inside the stomach of a Notelops|Notelops brama. left|thumb|R. buccalis with several hundred small shrimp in stomach. thumb|Fossil in Vienna

Calamopleurus is a prehistoric genus of marine halecomorph ray-finned fish from the Early Cretaceous of South America and northern Africa. It was a relative of the modern bowfin, with both belonging to the family Amiidae. C. cylindricus was among the largest known amiids, rivaling the giant Paleocene bowfin Amia pattersoni in size. However, both were slightly smaller than Melvius and Amia basiloides, the two largest known amiids. It is one of the earliest known amiids to evolve a large body size.

Araripichthys is an extinct genus of marine ray-finned fish that lived from the Aptian to Coniacian stages of the Cretaceous period. The genus is named after the Araripe Basin, where it was found in the Crato and Santana Formations. Other fossils of the genus have been found at Goulmima in Morocco, the Tlayua Formation of Mexico and the Apón Formation of Venezuela.

Cladocyclus (derived from the Greek κλάδος/kládos ("branch") and κύκλος/kýklos ("circle")) is an extinct genus of marine ichthyodectiform ray-finned fish from the middle Cretaceous. It was a predator of about in length.

Cearachelys is an extinct genus of pleurodiran turtle which existed some 110 million years ago. The genus is monotypic, with only type species Cearachelys placidoi known.

Araripemys is an extinct marine turtle genus from 112 to 109 million years ago, in the Early Cretaceous Crato and Romualdo Formations of the Araripe Basin in northeastern Brazil. It is one of the oldest known pleurodires. thumb|left|Araripemys barretoi

Araripelepidotes is a genus of ginglymodian fish.

Bakiribu () is an extinct genus of ctenochasmatid pterosaurs known from the Early Cretaceous (Aptian–Albian age) Romualdo Formation of Brazil. The genus contains a single species, Bakiribu waridza, known from the fragment remains of two individuals preserved in a regurgitalite. This indicates the pair may have been consumed by a spinosaurid theropod dinosaur. It represents the first member of the broader clade Archaeopterodactyloidea described from the Romualdo Formation. Bakiribu has a unique pattern of closely-packed comblike teeth in the upper and lower jaws that may have been used for filt