Ostracodermi

Thesaurus

Noun

Ostracodermi - extinct group of armored jawless vertebrates; taxonomy is not clearorder Ostracodermianimal order - the order of animalsAgnatha, superclass Agnatha - superclass of eel-shaped chordates lacking jaws and pelvic fins: lampreys; hagfishes; some extinct formsostracoderm - extinct fish-like jawless vertebrate having a heavily armored body; of the PaleozoicHeterostraci, suborder Heterostraci - extinct group of armored jawless fishes or fish-like vertebrate; taxonomy is not clearCephalaspida, Osteostraci, suborder Cephalaspida, suborder Osteostraci - extinct group of armored fish-like vertebrates; taxonomy is not clear

Ostracodermi

the oldest vertebrates. They are known from Silurian and Devonian deposits. The vertebrates measured up to 2 m long. They had an internal cartilaginous skeleton and an external shell made up of separate plates or small scales. Together with the extant Cyclostomata, the Ostracodermi belong to the Agnatha. They are significant in determining the stratigraphy of the Devonian.

REFERENCE

Osnory paleontologii: Bescheliustnye, ryby. Moscow, 1964.

Ostracodermi

a class of jawless fossil fish which are usually classified, together with the CYCLOSTOMES, in the Agnatha. They existed from the ORDOVICIAN PERIOD through to the DEVONIAN PERIOD and were heavily armoured.

Ostracodermi

noun

Synonyms for Ostracodermi

noun extinct group of armored jawless vertebrates

Synonyms

order Ostracodermi

Related Words

animal order
Agnatha
superclass Agnatha
ostracoderm
Heterostraci
suborder Heterostraci
Cephalaspida
Osteostraci
suborder Cephalaspida
suborder Osteostraci

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