Xanthogramma species in Europe

While X. citrofasciatum, X. laetum and X. marginale are relatively easy to ID, the following species-complex (formerly regarded as a single species) is harder to approach:

X. pedissequum, dives and stackelbergi are very similar looking species and often (especially in males) not safely to ID. Fotos from different angles (dorsal, lateral, ventral [abdomen!] and in females also a frontal view) can be very helpful for the ID process.

This is a map view of the three species, including those at genus level.

https://www.inaturalist.org/taxa/map?taxa=461173,136600,136599,505657#4/51.317/14.236


And click here to see the distribution in the compare tool.


X. stackelbergi clearly is the rarest reported species of those three on iNaturalist.
X. pedissequum has a more northerly distribution, but with a broad range of overlap with X. dives.. X. stackelbergi probably can be found across the continent.

Features to look for:

X. dives:
the yellow pleuron is sometimes also present in X. pedissequum, so a combination of characters is important. Darkened wing tip ususally only obvious in females. A view from the underside has the border of the sternite yellow, where in X. pedissequum there should be a dark line where the arrow points to.



X. stackelbergi:
The yellow spot on tergite 2 is not triangular, but more 'dragged' in direction of the rear end, resulting in a rounder and skewed shape.
But careful: These marks are variable within these species and can only give a hint but don't allow an ID on its own!
The dark wing spot does not extend beyond vein r2+3 (purple line). Compare wing of X. dives above, where the dark area crosses the vein.

Posted by carnifex carnifex, July 09, 2020 16:28

Comments

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Many thanks indeed for this journal entry! For three reasons:

for the information in here on how to distinguish Xanthogramma species
for showing me the usefulness of journals in iNaturalist, I hadn't yet understood how they could be used
for showing me how to make a multi-species map (https://www.inaturalist.org/taxa/map?taxa=461173,136600,136599,505657#4/51.317/14.236) - had no idea we could do this!

Posted by anasacuta 10 months ago (Flag)
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You're welcome. Glad you found this useful

Posted by carnifex 10 months ago (Flag)

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