invertebrates

phylum Echinodermata

• helmet urchin (Colobocentrotus atratus)

• blue-black urchin (Echinothrix diadema)

• rock-boring sea urchin (Echinometra mathaei)

• white-spotted sea cucumber (Actinopyga varians)

• ashy sea cucumber (Holothuria cinerascens)

phylum Cnidaria

• glass anemone (Aiptasia pulchella)

• cauliflower coral (Pocillopora meandrina)

phylum Arthropoda

• Seurat's hermit crab (Calcinus seurati)

• thin-shelled rock crab (Grapsus tenuicrustatus)

• Hembel's rock barnacle (Euraphia hembeli)

phylum Mollusca

• warty slug (Peronia platei)*

• granulated drupe (Arakawania granulata)

• black-foot ‘opihi (Cellana exarata)

• dotted periwinkle (Littoraria pintado)

• Hawaiian snakehead cowry (Monetaria caputophidii)

• black nerite (Nerita picea)

• calyx bubble snail (Smaragdinella calyculata)

• variable worm snail (Thylacodes variabilis)

• Hawaiian turban snail (Turbo sandwicensis)

* = first identified species encounter

-0.4 low tide! Noticing changes in the ecology across the length of the beach and through the tide zones was particularly cool today.