Infraclass

Irregularia (Irregular sea urchins)

Dendraster excentricus. Photo: (c) pearlmaker, some rights reserved (CC BY-NC)

iNaturalist • Wikipedia

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

Humboldt Life
- Kingdom: Animalia (Animals)
  - Phylum: Echinodermata (Echinoderms)
    - Subphylum: Echinozoa (Sea urchins and sea cucumbers)
      - Class: Echinoidea (Sea urchins, sand dollars, and heart urchins)
        Subclass: Euechinoidea (Sea urchins)
        Infraclass: Irregularia (Irregular sea urchins)
        Subterclass: Neognathostomata (1)

Subtaxa

Subterclass: Neognathostomata

Where in Humboldt

Discussion

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