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Luc Bettinelli : France : Poligny : 39800 : 16/10/2024
Altitude : 358 m - Taille : 3-4 mm
Réf. : 350437



Luc Bettinelli : France : Poligny : 39800 : 16/10/2024
Altitude : 358 m - Taille : 3-4 mm
Réf. : 350436

glais

Good evening, this fly placed on ivy a few days ago seems to be Sapromizosoma (notably with the ocellar bristles outside the triangle formed by the ocelli).

I rule out quadripunctata from the possibilities because of the 4 rows of acrostical setae.

Then, can we move forward? I am lost on the criteria for the points on the abdomen between laevatrispina and quadricincta.

It is also not easy to define the number of points on my individual.

Thanks for your help.

Luc

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It is more probable that this is laevatrispina than quadricincta. The number of abdominal spots on the abomen is rather variable in this group but in my experience laevatrispina is the proud owner of three pairs more often than quadricincta (note bipunctata is one of the synonyms of that species ) but three pairs for laevatrispina is not 100% reliable.

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Thank you Paul.

Already, I deduce that my individual has three pairs of points, which seems quite logical, but I was not at all sure. The points criterion is therefore indicative, are the reliable criteria on the genitalia?

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Indeed.

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Thank you !