Heterolepidotus

Heterolepidotus is an extinct genus of prehistoric marine halecomorph ray-finned fish from the Early Jurassic of Europe. It is alternately considered a member of the Ionoscopiformes or Ophiopsiformes.

Taxonomy The following species are known:

H. latus Egerton, 1872 (type species) - Early Jurassic (Sinemurian to Pliensbachian) of England (Blue Lias & Charmouth Mudstone) H. serrulatus (Agassiz, 1843) - Early Jurassic (Hettangian) of England (Blue Lias)

The genus Brachyichthys, used to contain Late Jurassic species, was formerly thought to be a synonym of Heterolepidotus, but has been revived by more recent studies. Indeterminate records have been made of Heterolepidotus from the Middle Jurassic (Callovian)-aged Kellaways Formation of England, albeit under an older treatment that placed the Late Jurassic species within Heterolepidotus.

Synonyms Several Triassic and Late Jurassic species previously assigned to Heterolepidotus have since been reassigned to other genera or synonymized with other species:

Heterolepidotus cephalus (Kner, 1866) → Pholidophorus cephalus Kner, 1866 Heterolepidotus dorsalis (Agassiz, 1834) → Paralepidotus ornatus (Agassiz, 1834) Heterolepidotus grandis Davis, 1885 → Osteorachis macrocephalus Egerton, 1868 Heterolepidotus parvulus (Agassiz, 1834) → Paralepidotus ornatus (Agassiz, 1834) Heterolepidotus pectoralis (Bellotti, 1857) → Semionotiformes indet. Heterolepidotus radio-punctatus (Agassiz, 1844) → Pholidophorus radio-punctatus Agassiz, 1844

Heterolepidotus serratus (Bellotti, 1857) → Semionotiformes indet Heterolepidotus striatus Agassiz, 1837-44 → nomen dubium Heterolepidotus typicus (Winkler, 1861) → Brachyichthys typicus (Winkler, 1861)

Heterolepidotus

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