Invertebrate lab exam

Darwin’s barnacle

Austrominius modestus; four plates and a diamond-shaped center.

Semibalanus balanoides; six plates and a diamond-shaped center, three plates in a cluster

Montagu’s barnacle

Cthalamus montagui; six plates and a kite-shaped center.

Star barnacle

Cthalamus stellatus; six plates and an oval-shaped center.

China limpet

Patella ulyssiponensis; low-cone shell, orange radula

Common limpet

Patella vulgata; brown radula

What do limpets graze on?

Microalgae

Blue-rayed limpet

Patella pellucida; lives on seaweed

Flat topshell

Steromphala umbilicalis; reddish-purple stripes, umbilucus

Grey topshell

Steromphala cineraria; ash-grey or yellowish, less obvious umbilucus

Painted topshell

Calliostoma zizyphinum; sharply pointed, pink-violet

Common/edible periwinkle

Littorina littorea; ear-shaped operculum, dark brown

Rough periwinkle

Littorina saxatilis; distinctive rough texture

Flat periwinkle

Littorina obtusata; flat-topped, final body whirl very large, orange

Dogwhelk

Nucella lapillus; oval, short siphonal canal

Thick-lipped dogwhelk

Tritia incrassata; toothed lips

What is the siphonal canal in dogwhelks used for?

Predation on mussels, barnacles, limpets and periwinkles with a radula.

Blue mussel

Mytilus edulis; bind to rocks with byssal threads, increase water clarity

European green crab

Carcinus maenas

Edible crab

Cancer paganus

Porcelain crab

Porcellana platycheles

Montagu’s crab

Xantho hydrophilus

Hermit crab

Pagarus bernhardus