Flagger Content Author Content Reason Flag Created Resolved by Resolution
treegrow European Crane Fly (Tipula paludosa)

Oodles of misidentifications due to iNat autosuggestions

Oct. 19, 2019 02:10:14 +0000 Not Resolved

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Just about every beige-ish cranefly without strongly marked wings ends up as Tipula paludosa on iNat. Many of these are probably misidentifications. Below is my understanding of the situation, but crane flies really aren't my thing, so I hope some people who know more about them will weigh in. @edanko @aispinsects

Distribution: T. paludosa occurs in both northwestern Europe and northern North America (introduced in the 1960s). Any records in tropical Asia or South America are almost certainly misidentifications. But many records in Europe and North America are probably also incorrect. In North America, the species is limited to Canada and the very northern US states. As far as I know there are no reliable records from the Southeastern or Southwestern United States.

Phenology: I don't know the phenology of the species in Europe. In the US, there's apparently only one generation per year, and adults are only out in late summer and early fall. Any US records of adults from spring and early summer are most likely misidentifications. More info about the life cycle: Gelhaus 2005, Vittum 2016, New York Invasive Species Information.

Identification: Currently there are all manner of crane flies filed under T. paludosa. Most are probably Tipulas, but there are also tipulids from other genera, quite a few limoniids, other Nematocera, and the odd ichneumon wasp.
T. paludosa has a simple wing pattern. There's a narrow dark band along the leading edge of the wing and a broad white band right next to it. There are no other pigmented areas in the wing, so any crane fly that has pigmented cells, dark spots, transverse bands or smoky cross-veins in the wings cannot be T. paludosa.

Identification of T. paludosa is complicated by the fact that there is a very similar species, T. oleracea, also in the subgenus Tipula and introduced from Europe. Females of the two species can be told apart based on the relative length of the wings as compared to the abdomen. To tell apart males, you have to have a view of the underside of the head or a good close-up of the antennae. More details about identification: Peck et al. 2006, Crane Fly Pests of the Pacific Northwest.

Posted by treegrow over 4 years ago

@jongelhaus Would there be anything you would like to add?

Posted by aispinsects over 4 years ago

Trying to tackle these from Texas as well.

Here is my copy-paste message. Feel free to use/modify:
This observation is best left at genus or family, I think. The visual algorithm (auto-suggestion) gives the European crane fly as the top suggestion, but I don’t think there are any credible records of this species in Texas… On bugguide, most of these ‘crane flies’ are left at the family or genus:
https://bugguide.net/adv_search/bgsearch.php?user=&taxon=183&description=&location%5B%5D=TX&county=&city_location=&adult=&immature=&male=&female=&representative=

Posted by sambiology about 4 years ago

@sambiology Thanks for the good work!

Posted by treegrow about 4 years ago

No curation issue.

Posted by borisb 7 months ago

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