Planorbella duryi
Planorbella duryi, common name the Seminole rams-horn, is a species of air-breathing freshwater snail, a pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails.
Planorbella duryi | |
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Apical and apertural view of a shell of Planorbella duryi. Scale bar is 10 mm. | |
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Species: | P. duryi |
Binomial name | |
Planorbella duryi (Wetherby, 1879) | |
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Distribution
This species of snail is endemic to Florida, United States.
It has been introduced to Hawaii and lives in the wild there.
It is an introduced species in various European islands and countries including:
- Great Britain as a "hothouse alien"
- Ireland as a "hothouse alien"
- Poland
- Hungary
- Parts of Southern Nigeria [e.g Ogun State, Lagos, Oyo]
gollark: The reason I think the assumption isn't great is that people see each other in multiple gatherings and so one person being infected means others are more likely to be and vice versa
gollark: It replicates what <@215706991748841473>'s code does. Also, I'm not sure exactly what you're saying.
gollark: (the code makes the same simplifying assumption anyway)
gollark: I'm pretty sure that (assuming the probability of each person at the gathering having COVID-19 is independent and just equal to the fraction of the population which us infected, which is not true but important to simplify) the number of people at the gathering who have it follows the binomial distribution.
gollark: =tex 1 - \left ( 1 - \frac{P_{covid}}{P} \right ) ^{N_{gathering}}
References
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