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Free images of Animals - Crustaceans

Note on large files:  Very large files may be bigger than your screen.  
Right click on any portion of the image showing and chose "save as". 

 

 

What's the difference between a Mollusc and a Crustacean?

Arthropods, the group to which Crustaceans belong, is a large group of invertebrates - Molluscs is the second largest.  They both have - a muscular interior to facilitate movement; a digestive system with a mouth and other sense organs.  

Both Molluscs and Crustaceans may be found in fresh and salt water.  Both require a male and female to reproduce.  Finally, both go through various growth stages via metamorphosis, to achieve adulthood.  

While Arthropods have a hard exoskeleton made out of chitin,  Molluscs have shells as a protective covering.  Some Molluscs are easy to spot - look for those marine animals that have hinged two-part shells.

 

Which is Which?

 


Crustaceans

 

Barnacles
Crabs
Crawfish/Crayfish
Krill
Lobster
Prawns
Shrimp



Molluscs

(Also known as Shellfish)

Clams
Cuttlefish
Mussels
Octopus
Oysters
Scallops
Slugs
Snails
Squid
Winkles

 

Crustaceans

crawfish pngThe name "Crustacean" comes from its Latin root "crustaceus" which means "having a crust or shell".  As the animal grows, the inelastic exoskeleton becomes too small and is shed.  A new, larger exoskeleton is formed.

Crustaceans also have jointed legs, a segmented body that is bilaterally symmetrical, a pair of mandibles for chewing food and two pairs of maxillae to help the mandibles position the food.  

There are many body shapes and colours in this large group.  The only feature that all Crustaceans share is that they have two pairs of antennae at some stage of their life cycle.

While most Crustaceans live in the water, there are some that live on the land.

Right:  crawfish_png_1  (381 x 336)
Download large image here.  (1104 x 974)

 

Did you know... 

that there are currently about 38,000 various species of Crustaceans?


 Dungeness Crab

Metacarcinus magister is commonly known as the Dungeness Crab that gets its name from the port of Dungeness in Washington.  They inhabit the waters of the west coast of North America.

Growing to about 20-25 cm, this species of crab is eaten for its sweet and tender flesh, but only about one-quarter of the crab's weight is meat.  If it feels threatened, this crab buries itself completely in the sand.

An interesting fact about this crab is that food in its gut is digested by a "gastric mill" which are a collection of tooth-like structures.

Did you know... 

that the Dungeness  Crab is the number one commercially grown crab in the Pacific Northwest?

 

Dungeness Crab at fish market

Dungeness Crab - 1

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Hand holding Dungeness Crab at fish market

Dungeness Crab - 2

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Large - 4315 x 3236  -  Now only available upon request.

 

 

Fresh Dungeness Crab

Dungeness Crab - 3

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Face of a Dungeness Crab

Dungeness Crab - 4

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Large - 4608 x 3456  -  Now only available upon request.

 


 

Lobster

True lobsters are those in the Nephropidae family.  They have muscular tails with which they propel themselves along the ocean floor.  Three of their five pairs of legs have claws.

Like other crustaceans, as a lobster grows, its exoskeleton becomes too small and it needs to be shed.  This is known as "molting".  Before the old exoskeleton is shed, a new soft one has formed underneath the old one.  Until the new exoskeleton hardens, the lobster is quite vulnerable.

Lobsters are a commercially important species since we humans so enjoy eating them.  They are also prey to other animals including fish, pinnipeds (wing- or fin-footed animals such as seals, sea lions and walrus)  and whales. 

Large fresh lobster

Lobster - 1

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Front view of lobster

 Lobster - 2

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Face eyes of lobster

 Lobster - 3

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Large - 2448 x 3264  -  Now only available upon request.

 

Large lobster claw

 Lobster Claw - 4

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Large - 3264 x 2448  - Now only available upon request.

 

 

Two large cooked lobsters

Cooked lobster - 5

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Two cooked red lobsters

Cooked lobster - 6

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A huge cooked lobster

Cooked lobster - 7  Now that's a big one!

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Large - 1936 x 2592  - Now only available upon request.

 


 

Red Claw Yabby

Looking very much like a miniature lobster, Cherax quadricarinatus, is commonly known as the "Red Claw Yabby, the Queensland Red Claw", or the "Blue Crayfish".  It is the largest of the freshwater crayfish.  Males can grow to be 20-25 cm long, females up to 18 cm.  "Quadricarinatus" refers to the four long ridges found on the top of their head.  This species of crayfish is a blue/green colour.  The cleaner its water, the more intense its blue colour.  

This species of crayfish is farmed in many parts of the world.  It is preferred because of its large size, fast growth and great taste.

Red Claws are native to the waters around Australia, but after being introduced to other parts of the world, are now considered an invasive species in South Africa, Mexico, Jamaica and Puerto Rico.

 

Why is this species called Red Claw when I can't see any red on the claws?

As the female Yabby matures, her claws become more blue with age.  Only the males have red spots on their claws.  The images below are of female Yabbies.

 

Red Claw Yabby

Red Claw Yabby - 1

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 Blue lobster looking Red Claw Yabby

Red Claw Yabby - 2

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Large - 4608 x 3456  -  Now only available upon request.

 


 

Shrimp

 

shrimp platter

Shrimp and cold-cut platter - 1

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cascading shrimp platter

Shrimp platter - 2

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Large - 3264 x 2448  -  Now only available upon request.

 

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If you'd like to drop me a note to let me know if any of these images have been useful, I'd love to hear from you. I'm curious to see if my snapshots have been of benefit to you in some way.  Also, I'd like to hear what kind of images you'd like to see more of. 

 

 

Aquatic Animals

 

"Many men go fishing 
all of their lives 
without knowing 
that it is not fish 
they are after."

~ Henry David 
Thoreau ~

 

 

"I never drink water 
because of the 
disgusting things 
that fish do in it."

~ W.C. Fields ~

 

Fun Fish Facts


- Catfish have over 27,000 taste buds while humans have only 7,000.

 

 

- Sharks are the only fish that have eyelids.

 

 

- As a fish grows, the number of its scales does not increase.  Instead, each scale increases in size.  You can determine the age of a fish by the number of growth rings on the scales.

 

 

- Most fish have air bladders that help to keep them afloat.  Sharks don't have them and must either swim continually or rest on the bottom of the ocean.

 

 

Did you know...

that a fish can drown?  Since fish need oxygen just like we do, if there isn't enough oxygen in the water, they will drown.

 

 

 

 

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