Mediterranean Mussel Mid Dark blue; triangular shell; smaller Mytilus and smoother than California Mussel galloprovincialis OCTOPUS: Two-spotted Octopus Low Two blue, eyelike spots on the Octopus web just below the eyes give this bimaculoides octopus its name. CHITONS COMMON NAME SCIENTIFIC NAME ZONE DESCRIPTION Spiny Chiton Mid brown w/ white stripes; Nuttallina sp. girdle has bristles Hartweg’s Chiton Mid Olive green with brown stripes; girdle Lepidochitona (under is banded and smooth hartwegii algae) CRABS COMMON NAME SCIENTIFIC NAME ZONE DESCRIPTION Blueband Hermit Crab Mid (in Bright blue bands circle walking legs. Pagurus samuelis tidepools) Red antennae Hairy Hermit Crab Mid (in White bands on walking legs; brown Pagurus hirsutiuculus tidepools) antennae with bands Striped Crab: High/Mid Reddish purple with green and black Pachygrapsus stripes across front crassipes BARNACLES: COMMON NAME SCIENTIFIC NAME ZONE DESCRIPTION Little Brown Barnacle High Smooth round margin. Smooth Chthamalus dalli (small acorn barnacles) brownish plates Irregular margin. plates. Rough Chthamalus fissus Large Acorn Barnacle High/Mid Larger in size than Balanus glandula Chthamalus Red Thatched Barnacle Mid/Low Brick red and volcano shaped; ridged Tetraclita rubescens or thatched in appearance Gooseneck Barnacle Mid/Low Stalked with white plates Pollicipes polymerus
Mediterranean Mussel Mytilus galloprovincialis Mid Dark blue; triangular shell; smaller and smoother than California Mussel OCTOPUS: Two-spotted Octopus Octopus bimaculoides Low Two blue, eyelike spots on the web just below the eyes give this octopus its name. CHITONS COMMON NAME SCIENTIFIC NAME ZONE DESCRIPTION Spiny Chiton Nuttallina sp. Mid brown w/ white stripes; girdle has bristles Hartweg’s Chiton Lepidochitona hartwegii Mid (under algae) Olive green with brown stripes; girdle is banded and smooth CRABS COMMON NAME SCIENTIFIC NAME ZONE DESCRIPTION Blueband Hermit Crab Pagurus samuelis Mid (in tidepools) Bright blue bands circle walking legs. Red antennae Hairy Hermit Crab Pagurus hirsutiuculus Mid (in tidepools) White bands on walking legs; brown antennae with bands Striped Crab: Pachygrapsus crassipes High/Mid Reddish purple with green and black stripes across front BARNACLES: COMMON NAME SCIENTIFIC NAME ZONE DESCRIPTION Little Brown Barnacle (small acorn barnacles) Chthamalus dalli Chthamalus fissus High Smooth round margin. Smooth brownish plates Irregular margin. plates. Rough Large Acorn Barnacle Balanus glandula High/Mid Larger in size than Chthamalus Red Thatched Barnacle Tetraclita rubescens Mid/Low Brick red and volcano shaped; ridged or thatched in appearance Gooseneck Barnacle Pollicipes polymerus Mid/Low Stalked with white plates
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