By Zackery Zwicker Benjamin OToole Katey Murphy Katie Gallant 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 m ID: 196620
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Slide1
Crustacea
By:
Zackery
Zwicker
, Benjamin O’Toole, Katey Murphy, Katie Gallant Slide2
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”
Cephalocarida
is proposed as having a body plan from which all crustacean features could
emerge
Cephalocarida Slide3
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 fossilSlide4
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 gillsCentral nervous system: Brain and ventral nerve cordSlide5
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. Slide6
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. Slide7
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 Slide8
Species of Crustacea
There are many species of Crustacea known, 67000, many of these are used for human consumption Slide9
Semibalanus balanoides
(Acorn Barnacle)
Grow up to 15 mm
Can produce up to 10,000 eggs
Sessile No abdomen Feed using Cirri Slide10
Talitrus saltator (Sand Hopper)
Compressed laterally
“Beach Fleas”
8.2-6.5 mm long
Known for hopping patterns Slide11
Homarus americanus
(Atlantic Lobster)
20-61 cm
.45-4.1 kg
Lives in cold shallow water
Same Order as crabs Culinary Delicacy Slide12
Euphausia superba (Antarctic Krill)
Grows to 6 cm in length
Weigh up to 2 grams
Most abundant species
Bioluminescent Slide13
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