Enteropneusta, the acorn worms, is a class of hemichordate invertebrates whose closest non hemichordate relatives are the echinoderms. There are 111 known species, with Saccoglossus kowalevskii serving as the primary research species; its two constituent families, Harrimaniidae and Ptychoderidae, are thought to have separated at least 370 million years ago.
Facts
Taxonomic Rank Member Count Band Era First Appeared Classification
Living or Extinct Sources
1. Wikidata (taxon extant/extinct status)
Wikimedia Foundation / Wikidata contributorsQ589697, descriptionView the Source 2. Wikipedia: Acorn worm
- Taxonomic rank (Wikipedia confirms the entity; rank from slug/structure-wave classification)
In Group: Hemichordate and Tunicate Classes, Lead
The acorn worms or Enteropneusta are a hemichordate class of invertebrates.
View the Source3. Catalogue of Life (ChecklistBank): Taxon metrics for Enteropneusta
Catalogue of Life (ChecklistBank)Taxon metrics, speciesExtantCountQuote, Taxon metrics, speciesExtantCount
"speciesExtantCount": 113
4. Paleobiology Database: Taxon record for Enteropneusta
Paleobiology DatabaseTaxon record, first appearance (firstapp_max_ma, early_interval)Quote, Taxon record, first appearance (firstapp_max_ma, early_interval)
"taxon_name": "Enteropneusta" ... "firstapp_max_ma": 516 ... "early_interval": "Stage 3"
Wikidata: Enteropneusta
Wikidata Q589697, class allow-list match (w-wdresolver-0926)View the Source Reader Challenges (0)
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