Macrosemiidae is an extinct family of ginglymodian fish. The family first appeared during the Middle Triassic[1] and disappeared during the Late Cretaceous. The group has been found in rock formations in Africa, Australia, Eurasia and North America.[2] As ginglymodians, their closest living relatives are gars, with them being typically placed as nested within the Semionotiformes.[3] Many members of the family have elongated dorsal fins, often associated with adjacent area of skin which was free of scales. These fins were likely undulated for use in precision swimming. Their body morphology suggests that they were slow swimmers that were capable of maneuvering around complex topography, such as reef environments.[4]
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bar:eratop from: -251 till: -199.6 color:triassic text:Triassic from: -199.6 till: -145.5 color:jurassic text:Jurassic from: -145.5 till: -65.5 color:cretaceous text:Cretaceous
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color:middletriassic bar:NAM1 from: -237 till: -149.03 text: Ophiopsis color:latetriassic bar:NAM2 from: -228.7 till: -199.6 text: Legnonotus color:latejurassic bar:NAM3 from: -155.7 till: -149.03 text: Macrosemius color:latejurassic bar:NAM4 from: -155.7 till: -99.6 text: Histionotus color:latejurassic bar:NAM5 from: -150.8 till: -65.5 text: Propterus color:latejurassic bar:NAM6 from: -150.8 till: -65.5 text: Notagogus color:latejurassic bar:NAM7 from: -147.3 till: -130 text: Enchelyolepis color:earlycretaceous bar:NAM8 from: -145.5 till: -93.5 text: Petalopteryx
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bar:period from: -251 till: -245 color:earlytriassic text:Early from: -245 till: -228 color:middletriassic text:Middle from: -228 till: -199.6 color:latetriassic text:Late from: -199.6 till: -175.6 color:earlyjurassic text:Early from: -175.6 till: -161.2 color:middlejurassic text:Middle from: -161.2 till: -145.5 color:latejurassic text:Late from: -145.5 till: -99.6 color:earlycretaceous text:Early from: -99.6 till: -65.5 color:latecretaceous text:Late
bar:era from: -251 till: -199.6 color:triassic text:Triassic from: -199.6 till: -145.5 color:jurassic text:Jurassic from: -145.5 till: -65.5 color:cretaceous text:Cretaceous