Crustacea
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Crustacea. By: Zackery Zwicker , Benjamin O’Toole, Katey Murphy, Katie Gallant . Evolutionary origin .

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Crustacea

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Crustacea

Crustacea

By: ZackeryZwicker, Benjamin O’Toole, Katey Murphy, Katie Gallant


Evolutionary origin

Evolutionary origin

  • Attempts have been made to construct a single hypothetical crustacean ancestor. Such an organism would have to possess: “elongated body, two pairs of appendages in front of the mouth, a pair of mandibles behind the mouth, and numerous trunk segments with appendages that form a continuous series of similar structure”

  • Cephalocaridais proposed as having a body plan from which all crustacean features could emerge

Cephalocarida


Crustacea

  • The earliest crustacean fossils are ostrocods.

  • There is evidence from the Burgess shales that many crustacean features had already evolved during the Cambrian Period (542 million to 488.3 million years ago)

Ostrocod fossil


Anatomy

Anatomy

  • Haemocoel: The body cavity in which blood flows

  • Sensory Organs: Compound eyes, statocysts (fluid filled cysts that sense direction of gravity), tactile hairs that respond to pressure or touch

  • Respiration: Diffusion or gills

  • Central nervous system: Brain and ventral nerve cord


Reproduction

Reproduction

  • Crustacea produce from eggs which have been fertilized by sperm

  • Most of the species are dioecious, there is a male and a female.

  • Most species brood their eggs, meaning they have many eggs that hatch at the same time.


Habitat

Habitat

Crustacea live in:

  • Oceans

  • Fresh water

  • Land

  • Many crustaceans are nocturnal

  • They spend their days hidden in a burrow, buried in the sand or sleeping in a crevice.


Crustacea

Diet

  • carnivores or scavengers

  • some are herbivores and detritivores

  • few classify as parasites

  • eat plants while some eat fish and other feed from the bottom of the ocean


Species of crustacea

Species of Crustacea

  • There are many species of Crustacea known, 67000, many of these are used for human consumption


Semibalanus balanoides acorn barnacle

Semibalanusbalanoides (Acorn Barnacle)

  • Grow up to 15 mm

  • Can produce up to 10,000 eggs

  • Sessile

  • No abdomen

  • Feed using Cirri


Talitrus saltator sand hopper

Talitrussaltator (Sand Hopper)

  • Compressed laterally

  • “Beach Fleas”

  • 8.2-6.5 mm long

  • Known for hopping patterns


Homarus americanus atlantic lobster

Homarusamericanus (Atlantic Lobster)

  • 20-61 cm

  • .45-4.1 kg

  • Lives in cold shallow water

  • Same Order as crabs

  • Culinary Delicacy


Euphausia superba antarctic krill

Euphausiasuperba (Antarctic Krill)

  • Grows to 6 cm in length

  • Weigh up to 2 grams

  • Most abundant species

  • Bioluminescent


Bibliography

Bibliography

  • http://www.reefed.edu.au/home/explorer/animals/marine_invertebrates/crustaceans

  • http://www.britannica.com/EBchecked/topic/144848/crustacean/33813/Evolution-and-paleontology

  • http://whyevolutionistrue.files.wordpress.com/2010/03/cephalocarida.jpg

  • http://www.nhm.ac.uk/resources-rx/images/1017/silurian-silicified-ostracod-fossil_71605_1.jpg

  • http://www.britannica.com/EBchecked/topic/144848/crustacean/33813/Evolution-and-paleontology


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