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The formulation Zygaena lonicerae/trifolii does not assert that it is "two species at once" rather it asserts it is one of two species but not possible to say which it is. A more specific diagnostic the just saying which genus it is.
Appreciated that your ID is spot on and careful David as said in my opinion I would think it is better to classify it as what we know it to be which is the Genus Zygaena , it is possibly one of the two species as you point out however you can not go beyond that and have no evidence to support either species Again with taxonomy and the creation of records based on a binomial system the trinomial doesnt neatly fall into folders Again the ID notes would be a better place I would have thought given all other observatyions are of binomial form Again all a matter of opinion
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that if iSpot sees fit to include such species pairs in its data dictionary then it can probably cope with people using them.
Views may differ of course.
Not worth debating over David I would certainly agree with an annotation in the form I have made as opposed to a choice of two species , accepted the dictionary has a folder for the category but is rather messy looking through things systematically when you come accross a mixed bag in a box i guess the experts and the Great British Spotters will sort it all out by agreement
The important point here is surely to return the most accurate information to the observer and anyone else who might be interested. So I would support the split ID, even if it does mess up the system a bit.
We have stirred up a hornet's nest of debate here! Thanks for the feedback. Although the photo itself does not show it, we believe our moth is more likely to be a Narrow-bordered 5-spot Burnet. The moth was spotted on a herb-rich dry grassy bank where its foodplants (Meadow Vetchling and Common Bird's-foot Trefoil) occur. This species is quite widespread in the Bristol area whereas the 5-spot Burnet is extremely rare. There have only been 2 records of 5-spot Burnet in the Bristol region since 1990, both presumably from sites where its foodplant (Greater Bird's-foot Trefoil) is found.
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