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iNat·552152infraclassAnimalia37,681 field observations
  1. Animals
  2. ›Echinoderms
  3. ›sea urchins and sea cucumbers
  4. ›Sea Urchins, Sand Dollars, and Heart Urchins
  5. ›sea urchins
irregular sea urchins
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irregular sea urchins

Irregularia

Irregularia is an extant infraclass of sea urchins that first appeared in the Lower Jurassic.

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2 branches of this group, most-observed first

Neognathostomata

subterclassNeognathostomata

Atelostomata

subterclassAtelostomata

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Where it lives

Recorded sightings

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geo-referenced records in GBIF, from museums, herbaria and field observers.

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In the stacks

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Every page naming Irregularia in the Biodiversity Heritage Library →

This page is assembled live from iNaturalist, GBIF, Wikipedia, the Source Library and the Internet Archive. It is not yet part of the hand-edited codex. iNaturalist taxon 552152.