Osmeriformes

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Osmeriformes
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Class:Actinopterygii
Order:Osmeriformes
Families

Suborder Argeninoidei
  Superfamily Argentinoidea
    Argentinidae (herring smelts)
    Microstomatidae
    Bathylagidae (deep-sea smelts)
    Opisthoproctidae (barreleyes)
  Superfamily Alepocephaloidea
    Leptochilichthyidae
    Alepocephalidae (slickheads)
    Platytroctidae
    (Searsiidae)
Suborder Osmeroidei
  Superfamily Osmeroidea
    Osmeridae (smelts)
    Plecoglossidae (ayu fishes)
    Salangidae (noodlefishes)
    Sundasalangidae (Sundaland noodlefishes)
  Superfamily Galaxoidea
    Retropinnidae (New Zealand smelts)
    Lepidogalaxiidae (salamanderfishes)
    Galaxiidae

Osmeriformes is an order of ray-finned fish that includes various kinds of smelts, noodlefish, and the odd-looking barreleyes. The order consists of 13 families with about 240 species total.

Characteristics of the order include the maxilla in the gape of the mouth, radii absent from the scales, and loss of the basisphenoid and orbitosphenoid bones. Almost all osmeriforms spawn in fresh water, but many are anadromous and found in temperate oceans worldwide.

The Argentinoidei are characterized by the presence of a crumenal organ, consisting of additional cartilage and gill rakers on the 5th ceratobranchial, while the Osmeroidea are notable for having their eggs surrounded by an adhesive membrane. Some classifications split the Argentinoidei genera Holtbyrnia, Maulsia, and Pellisolus out of the Platytroctidae family and into their own family called Searsiidae.

Reference

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