The jawless fish: an ancient vertebrate lineage that diverged before the evolution of hinged jaws, retaining a round, sucker-like or rasping mouth instead. Cyclostomata includes the lampreys and hagfish, among the very few surviving vertebrate lineages that never evolved jaws at all.
Facts
Disputed
Member Species/Taxa CountApproximate described-species (or, for a genus, described-taxon) count; continually revised as species are newly described, reclassified or synonymized. Taxonomic Rank Scientific Name Era First Appeared Classification
Living or Extinct Connections
Sources
1. Cyclostomata (Wikipedia)
comprises the living jawless fish classes: the lampreys and hagfishesView the Source 2. Catalogue of Life
3. Paleobiology Database: Taxon record for Cyclostomata
Paleobiology DatabaseTaxon record, first appearance (firstapp_max_ma, early_interval)Quote, Taxon record, first appearance (firstapp_max_ma, early_interval)
"taxon_name": "Cyclostomata" ... "firstapp_max_ma": 538.8 ... "early_interval": "Fortunian"
Wikidata: Cyclostomata
Wikidata Q500266, class allow-list match (w-wdresolver-0926)View the Source Cyclostomi (Wikipedia)
In Group: Vertebrate Classes, LeadQuote, In Group: Vertebrate Classes, Lead
Cyclostomi, often referred to as Cyclostomata (, from Ancient Greek κύκλος (kúklos), meaning "circle", and στόμα (stóma), meaning "mouth", and thus, "circular mouth") is a superclass of vertebrates that comprises the living jawless fish classes: the lampreys and hagfishes.
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