Calappidae is a family of crabs containing 16 genera, of which 7 are only known as fossils:
Parvilux is a genus of lanternfishes.
Ranina is a genus of crabs belonging to the family Raninidae. It has two extant species.
Sthenarosaurus is an extinct genus of rhomaleosaurid pliosauroid discovered in the Toarcian-aged 'Main Alum Shale' in Whitby, England. The type species, Sthenarosaurus dawkinsi, was named and described in 1909 by D. M. S. Watson. The type specimen is MMUM LL 8023, a set of postcrania discovered in Whitby. Other indeterminate specimens are known, including a pectoral girdle described in 1911. Plesiosaurian fossils were acquired for the Manchester Museum by William Boyd Dawkins who is honoured by the specific name.
Coccodus is an extinct genus of marine pycnodontid fish that lived during the Late Cretaceous. The various species had a pair of massive, curved spines emanating from the lower sides of the head, and one curved spine on the top of its head. Unlike most pycnodontids, Coccodus species had a comparatively long body, giving the living animals a superficial resemblance to a scaly chimaera.
Tharrhias is an extinct genus of prehistoric bony fish that lived during the Aptian stage of the Early Cretaceous epoch. The type species T. araripis is named after the Araripe Basin, in which it was found in sediments of the Santana Formation.
Chanopsis is an extinct genus of prehistoric freshwater bonytongue relative that lived from the late Aptian to the Albian stage of the Early Cretaceous epoch. It contains a single species, C. lombardi from the Democratic Republic of the Congo.
Spathiurus is an extinct genus of ray-finned fish that lived during the Cenomanian in the Sannine Formation of Lebanon.
Chongichthys is an extinct genus of marine ray-finned fish that lived during the Oxfordian stage of the Late Jurassic epoch. It contains one species, C. dentatus from the Quebrada El Profeta of Chile. It is named after Chilean geologist Guillermo Chong.
Thyrsocles is an extinct genus of prehistoric bony fish that lived during the Upper Miocene subepoch.
Gonioteuthis is a genus of belemnite, an extinct group of cephalopods. It grew to a body length of 8 inches and fed on small marine animals. Fossils of Gonioteuthis have been found in the Netherlands, Germany, and Sweden in rocks dated to the late Cretaceous Period, specifically 85 to 70 million years ago.
Chichia is an extinct genus of freshwater ray-finned fish that lived during the Guadalupian epoch. It contains a single species, C. gracilis, known from the Bogda Shan of Xinjiang, China.
Cheirodopsis is an extinct genus of marine ray-finned fish that lived during the Viséan stage of the Mississippian epoch. It contains a single species, C. geikiei from what is now Glencartholm, Scotland.
Daitingichthys is an extinct genus of prehistoric marine ray-finned fish that lived during the Late Jurassic period. It contains a single species, D. tischlingeri from the early Tithonian-aged Mörnsheim Formation of the Solnhofen Limestone, Germany. It is thought to be a stem-elopiform, related to modern ladyfish and tarpons.
Abadzekhia is an extinct genus of prehistoric snake mackerel that lived from the early Oligocene epoch in what is now the Caucasus Mountains of Southern Russia. Fossils of this genus have also been found in Germany.
Garnbergia is an extinct genus of prehistoric coelacanth that lived during the Anisian stage of the Middle Triassic epoch. It was discovered by Martin and Wenz in 1984. It comprises a single species, Garnbergia ommata.
Besania is an extinct genus of prehistoric marine ray-finned fish that lived during the Anisian and Ladinian ages of the Middle Triassic epoch in what is now southern/southeastern Switzerland and northern Italy. Fossils were recovered from the Besano Formation of Monte San Giorgio area and the Prosanto Formation of canton Graubünden, Switzerland.
Cephaloxenus is an extinct genus of prehistoric marine ray-finned fish that lived during the early Ladinian stage of the Middle Triassic epoch.
Protetragonites is an extinct genus of ammonoid cephalopods belonging to the family Lytoceratidae. These fast-moving nektonic carnivores lived from the Jurassic period Tithonian age to the Cretaceous period Aptian age.
Gaudryceras is an ammonite genus belonging to the family Gaudryceratidae.
