• Bacterial cell structure
• Flagellum
• Staphylococcus aureus
• Escherichia coli

• 

  Gephyrocapsa oceanica. (at coccolithophore) Gephyrocapsa is a genus of Haptophytes (a division of Algae)

• 

  Coccolithus pelagicus, a Coccolithophore of class Prymnesiophyceae in division Haptophyta

• Radiolarians
• Radiolarians

• Anatomy of a snail
• Euhadra peliomphala land snail
• White-lipped snail land snail

• 

  Helix pomatia (Roman snail), a Land snail, Gastropoda, Mollusca
  

Gastropoda: The class Gastropoda contains a vast total of named species, second only to the Insects in overall number.

• Helix aspersa land snail
• Cepaea nemoralis land snail
• Clausiliidae or door snails, land snail pulmonate which has a sinistral shell
• Prosobranchia sea snails Gastropoda
• Fulguropsis sea snail

• 

  White-lipped snail (Cepaea hortensis), a terrestrial pulmonate gastropod mollusc, Eupulmonata, Helicoidea within Stylommatophora

• Sea anemones
• Condylactis gigantea Sea anemone
• Sea anemone, named after the flower Anemone
• Venus flytrap sea anemone (Actinoscyphia aurelia)
• Nemanthus annamensis Sea anemone
• Bubble-tip anemone Sea anemone
• Marrus orthocanna
• Colpophyllia natans
• Actiniaria
• Aurelia aurita
• Phyllorhiza punctata Jellyfish

• 

  Aurelia aurita (moon jellyfish). Aurelia (genus) is a genus of Scyphozoan (σκύφος=drinking cup) Jellyfish.
  

A Medusa (biology) is an umbrella-shaped Cnidarian

• Jellyfish Cross Section
• Pillar coral

• Warty crab
• Triops longicaudatus

• 

  Malacostraca is the largest of the six classes of Crustaceans. μαλακός and ὄστρακον="shell", but the shell is only soft after Ecdysis (moulting)

• 

  Liocarcinus vernalis, the grey swimming crab
  

Phylum Arthropoda, Subphylum Crustacea, Class Malacostraca, Order Decapoda, Infraorder Brachyura (βραχύς= short, οὐρά= tail), Section Eubrachyura

• Grapsus grapsus
• Grapsus grapsus
• Male marbled rock crab Pachygrapsus
• Pachygrapsus marmoratus
• Chthamalus stellatus Barnacle
• Squilla mantis
• Periclimenes imperator
• Carpilius convexus
• Dungeness crab
• Mictyris longicarpus

• Strombus sinuatus
• Tonna galea
• Turbinella pyrum
• Eustrombus gigas
• Chicoreus ramosus
• Melo aethiopica
• Cymbiola imperialis
• Lambis crocata
• Tibia insulaechorab
• Lambis truncata
• Cymbiola nobilis
• Cymatium lotorium
• Donax variation at phenotype
• Blue mussel (Mytilus edulis) anatomy
• Giant clam (Tridacna gigas), the largest living bivalve mollusc
• Giant clam Mollusca

• 

  Hermaphrodite Scallops have up to 100 simple eyes, Bivalvia Mollusca, family Pectinidae (Latin "comb")

• Atlantic Bobtail cephalopod
• Common European Squid at Loliginidae cephalopod
• Loliginid squid at cephalopod
• Cephalopod intelligence

• 

  Sepiola atlantica Bobtail squid, Cephalopod (Κεφαλόποδα="head-feet") related to Cuttlefish

• 

  Bigfin reef squid cephalopod, showing Iridescence ἶρις (gen. ἴριδος=rainbow), from Iris (mythology)

• Amphioctopus marginatus cephalopod
• Cuttlefish cephalopod
• Cuttlefish cephalopod
• Chambered Nautilus, cephalopod
• Nautilus cephalopod
• Glaucus atlanticus Sea slug Nudibranch
• Flabellina iodinea Spanish shawl Sea slug Nudibranch
• Nembrotha lineolata Nembrotha, Sea slug Nudibranch
• Nembrotha Sea slug

• 

  Chromodoris quadricolor Sea slug, Nudibranch (Latin nudus=naked, Greek βραγχια=gills), Heterobranchia ("different-gilled" snails)
  

a marine opisthobranch gastropod Mollusca. Opisthobranch means "gills behind" (and to the right of the heart). In contrast, Prosobranch means gills in front (of the heart). Opisthobranchs are characterized by two pairs of tentacles and a single gill behind and to the right of the heart. Heterobranchia=Euthyneura (q.v)

• 

  Sunfish

• Ruffe
• Longnose sawshark
• Leopard shark

• 

  Great white shark (Carcharodon carcharias), Shark, Gigantothermy
  

Class Chondrichthyes (χονδρ=cartilage, ἰχθύς=fish), subclass Elasmobranchii (comprises Selachii (sharks) and Batoidea (rays, skates))

• Frilled shark, an uncommon species of shark in genus Chlamydoselachus

• 

  Basking shark (Cetorhinus maximus) is the second largest living fish, after the Whale shark.

• 

  Broadnose sevengill shark, in the order Hexanchiformes: primitive types of sharks with only six extant species.

• 

  Giant Oceanic Manta Ray, the largest ray in the world.
  

The largest recorded specimen was more than 7.6 metres (25 ft) across, and weighed about 2,400 kilograms (5,300 lb).

• Holocephali ("complete heads") (Chondrichthyes is Elasmobranchii and Holocephali)
• Redeye gaper
• Orange-lined triggerfish
• Blackback butterflyfish
• Scaldfish larva
• Bryaninops yongei
• Australian blenny
• Atlantic spadefish
• Thrissops formosus
• Bothus mancus at Underwater camouflage and mimicry
• Psetta maxima at Turbot
• Snowflake moray, Moray eel
• Fangtooth moray, Moray eel
• Paradise fish
• Synchiropus splendidus (at Mandarinfish)
• Pterois antennata
• Common lionfish
• Dried seahorse
• Pennant coralfish
• Camouflaged Flounder at Camouflage
• Salmon larva at Salmon
• Giant grouper
• Asian arowana
• Channichthyidae
• Oscar (Astronotus ocellatus), Astronotus Genus of Family Cichlidae

• 

  Chrysaora fuscescens (Pacific sea nettle), Scyphozoa (shaped like σκύφος=a kind of drinking cup) is a Class within Phylum Cnidaria

• 

  Clavelina moluccensis, blue bell Tunicate (sea squirt) in the genus Clavelina (the "little bottles").

• 

  Pyrosome, planktonic Tunicate. Plankton πλαγκτός="errant", and by extension "wanderer" or "drifter"

• Ascidiacea Tunicate
• Ascidiacea Tunicate
• Tunicate (Sea squirt) Polycarpa aurata, in Komodo National Park
• Marine Sponge, phylum Porifera="pore bearer", Sponge reef
• Calcispongiae at Calcareous sponge
• Slate pencil urchin Sea urchin
• Tripneustes ventricosus Sea urchin
• Spirobranchus giganteus Polychaete worm

• 

  Common clam worm Alitta succinea, marine Annelid of the Nereididae family of Polychaete worms

• 

  Bearded fireworm Hermodice carunculata, a Polychaete (Bristleworm with many Chaeta), Chaetotaxy

• Pectinaria annelid fanworm

• 

  Pseudoceros dimidiatus, a species of marine Flatworm in the genus Pseudoceros, Turbellaria

• Conus textile venomous sea snail

• 

  sessile Entoprocta "anus inside", contrasts with Bryozoa (Ectoprocta) having the anus outside a "crown" of hollow tentacles

• 

  Phoronid, a Filter feeder with a Lophophore. Superphylum Lophotrochozoa ("crest/wheel animals")

• Bryozoan with Lophophore extended

• 

  Ceratium furca, Dinoflagellate (δῖνος="whirling", Latin flagellum="whip, scourge"), Alveolate ("with cavities"), Protist, Eukaryote, Zooxanthella

• Phytoplankton
• Nuda, a class of Ctenophora (comb jellies) κτείς kteis=comb, φέρω=carry

• 

  Lamprey ("stone licker", from Latin lambere=to lick, Greek petra=stone). Family of jawless fish Agnatha (cf. Gnathostomata)

• Humpback whale, a Baleen whale, see Cetacea (κητος="whale")
• Little Penguin at Melbourne Zoo