Butterflies are important indicators of a healthy environment and ecosystem. They are flagship species for conservation in general and indicate a wide range of other invertebrates.
A correct butterfly identification is important for understanding the distribution of each species, for nature management and for conservation purposes.
Unfortunately, this
process can be tricky in a lot of cases.
Within the same family, many species show mutual similarities in wing characteristics.
These differences can be subtle and ask for a good examination of the specimen. Some species are not separable on external morphology.
Depending on the characteristics, different research methods will be used.
For species that do not have similar taxa, visual identifcation in the field is sufficient.
Field photography of local species makes sense to collect evidence. In the table below these species are marked with
For similar species, it is recommended to net the butterflies.
In the species monographs, the similar species and their distinguishing characteristics, if there are any, are given.
Comparative figures are available for all the involved species (see: monographs)
An example: Polyommatus.
Different field guides give identification keys and they can be used in the field.
The specific characteristics can easily be investigated by gently taking the butterfly between the thumb and a finger (Fig 1a-c).
It also allows to photograph both sides of the butterfly or a part of an antennal club.
After careful examination, the butterfly can be released.
1a. Investigation of the antennal club to distinguish Erebia medusa from Erebia oeme. Erebia medusa. Cerem, Albania. (Photograph: Sylvain Cuvelier )
1b. Investigation of the underside of a Colias specimen (Photograph: Sylvain Cuvelier )
For small specimens a Petri dish or transparant tube can be useful (Fig. 2)
2. Investigation of the underside of a Plebejus in a transparant tube. Albania (Photograph: Ken Bond )
Field photography has become very accessible and is a second option for similar species but only as second choice.
It can be difficult to visualize the characteristics you are looking for and in most cases it is only possible to photograph the upper- or the underside.
For the species with subtle and small characteristics, sampling the specimen for further research is the best option.
The voucher specimens also need to be prepared, labeled, databased and stored in a reference collection.
Misja (2005) devoted a chapter to the material and how to collect, process samples and build a reference collection: "1. Pjesa e përgjithshme I.1. Grumbullimi i fluturave, përpunimi dhe formimi i koleksioneve.
A translation of this chapter is available including some additional information (entomological material)
Such a reference collection (public or private) remains the mainstay of entomology because it provides evidence and contains material for optimal control of the identification, dissections and genetic research (if the material is not too old). It can be included in studies concerning population genetics, molecular systematics etc.
Responsible collecting, following ethical guidelines, remains an essential way to make further progress in the scientific knowledge of the butterflies.
Cryptic species, for example the Leptidea triplet (Dincă V. et al., 2011), are not separable based on external morphology. Sampling for analysis is needed.
In many cases, there are subtle differences in the structure of the male and/or female genitalia (Fig. 3). Dissection will allow a correct identification.
Fig. 3. Dissection of ♂ Maniola jurtina during a training on 19.vii.2022 for biology students at the Faculty of Natural Sciences, Department of Biology, Tiranë (Photograph: AP)
In a limited number of cases, there are only differences in the DNA. In this case, mitochondrial DNA barcoding is needed for a correct identification.
There are now also a few photo recognition apps available based on artificial intelligence. This is still in its infancy and similar species cannot yet be properly identified despite good photos (Mølgaard & Cuvelier, 2021) We currently advise against its use.
Guidelines for identifying the Albanian butterfly species
1. Visual: the butterfly can be dentified with certainty in the field as there are no closely similar species. : photographic evidence is preferred for local species.
2. Net (+) / sampling: for a correct identification, specific characteristics need to be examined.
3. Genitalia: a correct identification based on external characteristics is impossible. The diifferences in genitalia allow a correct identification.
4. Barcoding: only DNA barcoding allows a correct identification. Barcoded Albanian specimen(s) including the link to BOLDSYSTEMS or GENBANK (up to 4)