Coiling = coiling opposite of common variant (usually sinistral)
Scalarid = scalarid form
Eyes = conjoined eyestalks, multiple eyes on one eyestalk, etc.
Other = does not fit in the above
And on the right, A is the probability for a given gastropod observation to be that species, and B is the probability a given obs. of that species is aberrant. Both are expressed in “1 in x” format for probability, not as a percentage.
Does anyone know probabilities of a given individual being aberrant for other non-gastropod species?
Interesting. I used to work processing flounder and I was always intrigued when came in with the eye migrated in the opposite direction. I have no idea of the proportion!
You might consider creating an observation field to record the types of gastropod aberrations – this would put the data on iNat itself and enable other users to help add to it.
Calculating probability/percentage using iNat data is going to include some inevitable bias, because the observations do not represent systematic surveys and users are more likely to record notable individuals (e.g., because of aberrations) than ordinary (non-aberrant) ones.
(Also, the name “Shell aberration type” doesn’t really make sense when one of the types is “Eye/eyestalk deformity”… Also will need to make a “Color” type since a bunch of newly imported obs. from Amazing Aberrants group are leucistic/albinistic rather than one of the existing variants)
I’d bet that some “aberrations” are genetically / environmentally linked and thus not uniform across the species range. I investigated pigment loss in the wing of the eastern carpenter bee, Xylocopa virginica. I ended up not calculating a pigment loss rate across the species because that would involve not only finding all the individuals with the different wings but also tallying the number of observations in which we could clearly see the wing but had no pigment loss.
However, there were definitely hot spots (Texas, St. Louis) where there were tons of bees with wing demelanization whereas we didn’t find many in say Toronto or North Carolina despite there being lots of observations of the bee.
This is true of some other taxa as well. For instance, there is an area in South Carolina where I used to see lots of wierd Sassafras leaves – five lobes or sometimes what appeared to be two leaves conjoined at the “thumb.” I have seen Sassafras in many other places and never found an aberrant leaf like that.