Phylum: Crustacea

Shrimps, prawns, lobsters and crabs belong to the order Decapoda. Like all crustaceans, they are covered with protective exoskeleton and have articulated legs. They have five pairs of legs as reflected in their name - "decapoda" meaning "ten-legged". The front pairs are usually transformed into claws and are used to manipulate objects.

Shrimps, prawns and lobsters have a long abdomen that ends with a tail. Crabs have a small abdomen folded under the carapace. Hermit crabs have a longer abdomen, but it is not covered with shell plates and is usually protected inside a snail shell or a tube. Mantis shrimps are different from decapods and belong to the order Stomatopoda. They have a shorter carapace, longer abdomen and differently organized legs compared to decapods. A pair of front legs are designed somewhat similarly to praying mantis' and capable of smashing protective shells of their prey with tremendous speed and force (much faster than a praying mantis). Mantis shrimps have amazing compound eyes divided into two hemispheres by an equator belt.

Being one of the most diverse groups of animals, crustaceans are not easy to spot on the reef. Many of them are small, well camouflaged or transparent and the others are nocturnal. They usually hide in the reef during the day and abandon their hiding places at night. Night dives offer the best opportunity to see these animals in action.
Many crustaceans live in close symbiotic relationship with sponges, corals, mollusks, echinoderms etc.
Crustaceans are abundant in South East Asian waters.
Mantis shrimp Peacock mantis shrimp
Odontodactylus scyllarus
Spearer mantis shrimp
Lysiosquillina lisa
Mantis shrimp
Odontodactylus latirostris
Coleman shrimp
Periclimenes colemani
Harlequin shrimp
Hymenocera elegans
Spiny tiger shrimp
Phyllognathia ceratophthalma
Emperor shrimp
Periclimenes imperator
Crinoid shrimp
Periclimenes amboinensis
Crinoid shrimp
Periclimenes sp.
Starfish shrimp
Periclimenes soror
Crinoid shrimp
Periclimenes cornutus
Hinge-beak shrimp
Rhynchocinetes durbanensis
Reticulated hinge-beak shrimp
Cinetorhynchus reticulatus
Marbled shrimp
Saron marmoratus
Leander plumosus
Alpheus sp. crinitus Anemone shrimp
Periclimenes brevicarpalis
Commensal shrimp
Periclimenes holthuisi
Commensal shrimp
Periclimenes tosaensis
Banded coral shrimp
Stenopus hispidus
Cleaner shrimp - Urocaridella sp. Cleaner shrimp - Urocaridella sp. Commensal shrimp
Periclimenes venustus
Commensal shrimp Shrimp - Palaemonella pottsi Commensal shrimp
Periclimenes sp.
Commensal shrimp
Periclimenes sp.
Coral shrimp - Vir euphyllius Dasycaris zanzibarica or
Pontonides unciger
Periclimenes kororensis Bumblebee shrimp
Gnathophyllum americanum
Thor amboinensis Commensal shrimp
Latreutes anoplonyx
White-banded cleaner shrimp
Lysmata amboinensis
Skeleton shrimp - Caprella sp.
Sand prawn - Metapenaeus sp. Stripe-leg spiny lobster
Panulirus femoristriga
Panulirus cf. versicolor
Xenocarcinus tuberculatus
Commensal shrimp
Allopontonia iaini
Crinoid squat lobster
Allogalathea elegans
.Hairy squat lobster
Lauriea siagiani
Squat lobster - Galathea sp
White-spotted hermit crab
Dardanus megistos
Hermit crab
Calcinus laevimanus
Hermit crab
Trizopagurus strigatus
Anemone hermit crab
Dardanus pedunculatus
Majid crab
Hoplophrys oatesii
Zebra crab
Zebrida adamsii
Boxer crab - Lybia tessellata Hermit crab
Aniculus cf. miyakei
Coral crab
Porcellanella sp.
Coral crab Coral crab Square crab
Quadrella maculosa
Coral crab - Tetralia sp. Harlequin crab
Lissocarcinus orbicularis
Unidentified crab Elbow crab - Cryptopodia sp.
Anemone spotted porcelain crab
Neopetrolisthes maculata
Ghost / Sand crab
Ocypode ceratophthalma
Swimming crab Swimming crab in jellyfish
Carpilius maculatus Unidentified crab Round coral crab Box crab - Calappa philargius
Decorator crab
Camposcia retusa
Decorator crab Elbow crab - Harrovia elegans Sponge crab
Arrowhead crab Spider crab
Achaeus spinosus
Spider crab - Naxioides taurus Orang-utan crab - Oncinopus sp.
often called Achaeus japonicus
Spider Crab
Xenocarcinus conicus
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