Category:Galeaspida

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Galeaspida (it); Galeaspida (hu); Cá giáp mũ (vi); 盔甲魚類 (zh); Galeaspida (ast); Galeàspid (ca); Galeaspides (fr); Galeaspida (de); Galeaspida (pt); Galeaspida (sq); کلاه‌خودسپران (fa); Galeaspida (bg); Galeaspida (ru); Galeaspida (ro); ガレアスピス目 (ja); Galeaspida (ia); Galeaspida (sk); Galeaspida (war); Galeaspida (pl); Galeaspida (uk); Galeaspida (nl); 盔甲魚綱 (zh-hant); Galeaspida (es); Galeaspida (la); Galeaspida (fi); Galeaspida (en); Galeaspida (ceb); 盔甲鱼纲 (zh-hans); Galeaspida (ga) class of chordates (en); رده‌ای از مهره‌داران (fa); طائفة من الحبليات (ar); klasse uit de onderstam gewervelden (nl) Galeaspidi (it); Galeaspidae, Galeaspida (fr); Galeaspida (vi); Galeáspidos, Galeaspido, Galeáspido, Galeaspidos (es); 盔甲鱼纲 (zh); Galeaspida (ca)
Galeaspida 
class of chordates
Galeaspida 1.JPG
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Instance oftaxon
Start time440th millennium BC
End time401st millennium BC
Common name
Taxonomy
KingdomAnimalia
SubkingdomBilateria
InfrakingdomDeuterostomia
PhylumChordata
SubphylumVertebrata
ClassGaleaspida
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Galeaspida ("Helmet shields") is an extinct taxon of jawless marine and freshwater fish. Their name is derived from a Latin word for helmet, galea, and refers to their massive bone shield on the head. Galeaspida lived in shallow, fresh water and marine environments during the Silurian and Devonian times (430 to 370 million years ago) of what is now China and Vietnam. Their morphology is superficially similar to that of the Heterostraci more than the Osteostraci, as there is currently no evidence that the galeaspids had paired fins. However, the Galeaspida are regarded as being more closely related to the Osteostraci than Heterostraci as the morphology of the braincase is more similar to that of Osteostraci than Heterostraci.

Subcategories

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Media in category "Galeaspida"

The following 15 files are in this category, out of 15 total.