typical crustacean

Anatomy — Crustacean

Prawn

The common names ‘prawn’ and ‘shrimp’ are often used synonymously for the same crustaceans in different parts of the world. This field guide uses the terms according to where the species originates or is cultivated.

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external anatomy of a prawn

External anatomy of a prawn

A = antenna. AB = abdominal segment. AC = adrostral carina. AF = antennular flagellum. AS = antennal scale. E = eyestalk. HS = hepatic spine. P = pereiopods. Pl = pleopods. R = rostrum. SAS = sixth abdominal segment. T = telson. TM = third maxilliped. U = uropod

Source: Illustration © State of Queensland, Department of Primary Industries and Fisheries, 2007 (illustrator: R Bowater)

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Black tiger prawn

Black tiger prawn (Penaeus monodon)

Source: I East

Crab

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external anatomy of a crab

External anatomy of a crab

A = antenna. AB = abdomen (underneath). C = claw. CA = carapace. E = eye. SL = swimming leg. WL = walking leg

Source: Illustration © State of Queensland, Department of Primary Industries and Fisheries, 2007 (illustrator: R Bowater)

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internal anatomy of a crab

Internal anatomy of a crab (cut down the centre and looking side on). AG = antennal gland. DG = digestive gland. E = eye. H = heart. HG = hindgut. M = midgut. O = oesophagus. S = stomach. SG = supraoesophageal ganglion. TG = thoracic ganglion. VNC= ventral nerve cord

Source: Illustration © State of Queensland, Department of Primary Industries and Fisheries, 2007 (illustrator: R Bowater)

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Blue swimmer crab

Blue swimmer crab (Callinectes sapidus) with carapace removed revealing internal structure

Source: O Zmora

Freshwater crayfish

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External anatomy of freshwater crayfish

External anatomy of a freshwater crayfish

Source: Aquatic Animal Health, Product Integrity, Animal and Plant Health, AGDAFF

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Internal organs in section

Internal organs in section

Source: Aquatic Animal Health, Product Integrity, Animal and Plant Health, AGDAFF

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Redclaw crayfish

Redclaw crayfish (Cherax quadricarinatus)

Source: C Jones

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Redclaw crayfish with section of carapace removed

Redclaw crayfish with section of carapace removed, revealing location of the gills

Source: C Jones