Ovalipes catharus: Difference between revisions

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m The source never defines what a 'group' is, so I think this is more precise.
m I phrased this badly.
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==Diet==
[[File:Paphies australis on rocks.jpg|alt=The off-white shell of a lone specimen of ''Paphies australis'' sitting on a background of grey pebbles|thumb|right|Bivalves such as ''[[Paphies australis]]'' are a significant portion of the paddle crab's diet.{{sfn|Wear|Haddon|1987|p=40}}]]
The diet of paddle crabs consists predominantly of [[Mollusca|molluscs]] (especially of genus ''[[Paphies]]''), [[crustacean]]s, [[fish]]es, [[Polychaete|bristle worms]], and [[algae]].{{sfn|Wear|Haddon|1987|p=41}}{{sfn|Fisheries New Zealand|2023|p=1038}}{{sfn|Davidson|1987|p=29}} Large ''Ovalipes catharus'' tend to feed less frequently but generally on algae as well as on larger animals such as [[decapod]]s and [[teleost]]s, while smaller ones prey frequently on smaller, softer crustaceans such as [[amphipod]]s, [[isopod]]s, [[mysid]]s, and [[cumacean]]s.{{sfn|Osborne|1987|p=118}} They frequently cannibalise smaller [[conspecific]]s and those that have recently moulted during winter.{{sfn|Wear|Haddon|1987|p=47–48}}{{sfn|Osborne|1987|p=81}} They tend to eat more during the summer than during the winter.{{sfn|Haddon|Wear|1987|p=63}}{{sfn|Fenton|Salmond|Foreman|Curtis|2024|p=92–93}}
 
The flattened hind legs and streamlined body shape of the crab allow them to swim rapidly and catch faster prey,{{Sfn|Osborne|1987|p=3}}{{sfn|McLay|Osborne|1985|p=125}} and they have slender, tapered [[chelae]] which are well-suited to handling small molluscs.{{sfn|Davidson|1986|p=295}} Their chelae are dimorphic; the left is used for cutting while the right is used for crushing.{{sfn|Davidson|1986|p=285, 295}} The paddles also allow the crab to stabilise itself and balance on its third pair of walking legs when digging bivalve prey out of the sand.{{sfn|McLay|Osborne|1985|p=129}}