I've noticed that many Toxomerus observations, especially in Mexico, are being identified as Toxomerus watsoni: https://www.inaturalist.org/observations?place_id=any&subview=grid&taxon_id=418205
However, I've tried looking through all the papers I can find, and can't find any way to separate T. watsoni from similar species like T. duplicatus without a microscope.
I put all the similar individuals like that with simple abdomen patterns under one observation field so I can compare them here: https://www.inaturalist.org/observations?field:Toxomerus%20identifiable%20group=T.%20cf.%20duplicatus
After doing this, I noticed that many of the individuals that are identified as T. watsoni look a bit different from unidentified individuals.
For example, these two are both males but they look different:
https://www.inaturalist.org/observations/8735045
https://www.inaturalist.org/observations/18581132
The one that is called "T. watsoni" has a thinner, tubular abdomen, the dark bands are mostly black, and the last abdomen segment has a different pattern.
The other one has a flat, wide, abdomen, the dark bands are lighter grey, and the last abdomen segment has just a black dot.
I see similar differences in females, although the abdomen structure is less different:
https://www.inaturalist.org/observations/18227103
https://www.inaturalist.org/observations/12283401
But I don't know if that's still not enough to identify them to species.
Orange bands, pairs of commas, shiny blue stripes with little or not black borders (thinner)
https://www.inaturalist.org/observations/11915414
https://www.inaturalist.org/observations/20805941
https://www.inaturalist.org/observations/12283401
Orange or yellow bands, little or no commas, blue/shiny stripes with little or no black borders
https://www.inaturalist.org/observations/19827828
https://www.inaturalist.org/observations/11928637
https://www.inaturalist.org/observations/17277614
https://www.inaturalist.org/observations/484716
Orange or yellow bands, no commas, blue stripes with black borders
https://www.inaturalist.org/observations/21087951
https://www.inaturalist.org/observations/15864324
https://www.inaturalist.org/observations/20510754
https://www.inaturalist.org/observations/19625973
Most have dark ring near end of hind femur, but in some it's faint or not there.
Ones in Florida vary between groups 2 and 3: https://www.inaturalist.org/observations?place_id=21&subview=grid&field:Toxomerus%20identifiable%20group=T.%20cf.%20duplicatus
What species is this?
I've been trying to make a list of species that fall into the general group of simple band patterns: https://www.inaturalist.org/observation_fields/8909#activity_comment_1835840
T. brevifacies
T. buscki
T. corbis/planiventris?
T. difficilis
T. duplicatus
T. ecuadoreus
T. idalius
T. minutus?
T. norma
T. papaveroi
T. paraduplicatus
T. pinchinchae
T. productus
T. puellus
T. steatogaster
T. taenius
T. watsoni
評論
Mesogramma mutuum in Hull 1943 looks very similar (figure 60): https://archive.org/stream/entomolog232419431944broo#page/n45/mode/2up
Called T. mutuus here: https://archive.org/details/familysyrphidae00thom/page/52
Photos on BOLD: http://beta.boldsystems.org/index.php/Taxbrowser_Taxonpage?taxid=199592
Photos of T. watsoni from sources outside of iNat:
http://unibio.unam.mx/irekani/handle/123456789/26151?proyecto=Irekani
http://v3.boldsystems.org/index.php/Taxbrowser_Taxonpage?taxon=Toxomerus+watsoni&searchMenu=taxonomy&query=Toxomerus+watsoni
http://sci-web-001.amnh.org/imulive/iz.html#details=ecatalogue.10021962
https://archive.org/stream/entomolog232419431944broo#page/n41/mode/2up (figure 32)
新增評論