Macrosemiidae Temporal range: Late Triassic–Maastrichtian PreꞒ Ꞓ O S D C P T J K Pg N
Various Macrosemiiform fishes, from top to bottom A. Macrosemius rostratus (Germany, Late Jurassic) B. Legnonotus krambergeri (Austria, Late Triassic) C. Propterus elongatus (Germany, Late Jurassic) D. Propterus microstomus (Germany, Late Jurassic)E. Histionotus oberndorferi (Germany, Late Jurassic) F. Notagogus denticulatus (Germany, Late Jurassic)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Clade:	Ginglymodi
Clade:	Neoginglymodi
Order:	†Semionotiformes
Family:	†Macrosemiidae Thiollière, 1858
Genera
See text
Synonyms
Macrosemiiformes Carroll, 1988

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]

• †Order Macrosemiiformes
  • †Family Macrosemiidae, Thiollière, 1858
    • Genus †Eosemionotus^[3]
    • Genus †Agoultichthys^[5]
    • Genus †Aphanepygus
    • Genus †Disticholepis
    • Genus †Enchelyolepis
    • Genus †Orthurus
    • Genus †Petalopteryx
    • Genus †Neonotagogus
    • Genus †Histionotus
    • Genus †Legnonotus
    • Genus †Macrosemius
    • Genus †Propterus
  • Incetae sedis
    • Genus †Uarbryichthys^[6]
    • Genus †Voelklichthys^[6]

Wikimedia Commons has media related to Macrosemiiformes.

• Sepkoski, Jack (2002). "A compendium of fossil marine animal genera". Bulletins of American Paleontology. 364: 560. Archived from the original on 2009-02-20. Retrieved 2011-05-17.

v t e Ginglymodi
Kingdom: Animalia Phylum: Chordata Class: Actinopterygii Subclass: Neopterygii Infraclass: Holostei Actinopterygii see Actinopterygii Neopterygii see Neopterygii Ginglymodi see below↓ Ginglymodi
Ginglymodi †Diandongichthys †Luoxiongichthys †Ticinolepis †Sangiorgioichthys †Kyphosichthyiformes Kyphosichthyidae Fuyuanichthys Kyphosichthys Lashanichthyidae Lashanichthys Yudaiichthys †Semionotiformes Hoyasotes Lepidhoyas Lophionotus Neosemionotus? Quasimodichthys Semionotus Callipurbeckiidae Callipurbeckia Macrosemimimus Occitanichthys Paralepidotus Semiolepis Tlayuamichin Macrosemiidae Agoultichthys Enchelyolepis Eosemionotus Histionotus Legnonotus Macrosemius Macrosemiocotzus Notagogus Orthurus Palaeomacrosemius Propterus Uarbryichthys Voelklichthys Lepisosteiformes †Adrianaichthys †Beiduyu †Khoratichthys †Lanxangichthys †Neosemionotus? †Lepidotidae Camerichthys Isanichthys Lepidotes Mengius Scheenstia Lepisosteoidei †Araripelepidotes †Pliodetes †Thaiichthys †Obaichthyidae Dentilepisosteus Obaichthys Lepisosteidae Atractosteus †Cuneatus †Grandemarinus †Herreraichthys Lepisosteus †Masillosteus †Nhanulepisosteus †Oniichthys Incertae sedis †Acentrophorus? †Alleiolepis? †Aphelolepis? †Archaeolepidotus? † Austrolepidotes? †Corunegenys? †Paracentrophorus? †Pericentrophorus?