FISH 310 Lecture Notes - Lecture 18: Crab, Talitridae, Filter Feeder
10 Jun 2018
School
Department
Course
Professor
Feeding
Filter
Acorn Barnacles
Active Feeding
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Wide distribution
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Gooseneck Barnacles
Passive filtering
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Limited Distribution
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Deposit
Downturned claws
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Scavenging
Ghost Crab
Sensitive to smells of decomposition
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"sand flea" amphipods - primarily decomposing algae
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Herbivory
Land Crabs: Important in nutrient cycling
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Predation
Large claw for crushing mollusks
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Small claw for scraping; fine manipulation
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Maxillipeds for filter feeding
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Symbiosis
Shrimp with Anemones
Shrimp get protection from the anemones
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Crabs with Anemones
Boxer Crabs because they put anemone gloves on their claws
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Goby and Snapping Shrimp
Shrimps make the burrows and the Gobies are the "eyes" for the shrimp
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Reproduction
Most crustacea mate when female is soft-shelled
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System
Female reproductive tract (brachyuran crab)
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Crustacean sperm Non-Motile
Not moving, can last a long time, can stay in spermatheca for 2.5 years
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Clutch of eggs is sired by many many males
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Protandric Hermaphrodites
Spot Prawns
Males 1.5-2.5 years
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Then they become female 3.5 years to ?
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Hermaphrodites
Barnacles
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All decapods (except penaeid shrimp) brood eggs on pleopods
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Brachyuran vs. Anomuran
Size at first repro: 116mm (2/3 full size) 5mm (1/5 full size)
Size of Eggs: 400 micons 800 microns
Number of Eggs: 700,000 -2.5 million 7 -1,500
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Lecture 18: Arthropoda III
Monday, May 7, 2018
11:23 AM
