Archivos de diario de abril 2020

25 de abril de 2020

ID of Mnais demoiselles in Japan - work in progress

Mnais costalis:ニホンカワトンボ Nihonkawa Tombo: Japanese River Dragonfly
Mnais pruinosa: アサヒナカワトンボ Asahinakawa Tombo: Asahina River Dragonfly

disclaimer: As a far more expert odonatist pointed out recently: this info is based on slightly aged information. What is the current situation status? (december 2023)

My first odonata in Japan were those gorgeous orange-winged streamdwellers I had hoped to see. Then came the difficulty of ID'ing them properly.

Hopefully i will be able to store here some information on the two Mnais-species represented in Japan..

WORK IN PROGRESS --- INITIAL PHASE

1 id certain based on confusing map:
https://www.inaturalist.org/observations/18800588
wingcolour of female is smokey: costalis only feature

1 id certain based on low number of cells next to pterostigma
https://www.inaturalist.org/observations/18806161

https://www.inaturalist.org/observations/18869536

costalis: as no orange winged pruinosa lives in this area
https://www.inaturalist.org/observations/22020143

read more about wingcells and veinage
http://www.odonata.jp/03imago/Calopterygidae/index.html#vein
https://link.springer.com/chapter/10.1007/978-981-10-4956-9_17

edit 26 april 2021: Note this record of otherwise a quite standard looking costalis (in North-Japan, where pruinosa does not occur) with what seems a small amount of cells adjacent to pterostigma ... not sure what to make of it...
https://www.inaturalist.org/observations/64427110

wings of both male and female of both species
https://ai2-s2-public.s3.amazonaws.com/figures/2017-08-08/e307ef137cc53f28a193ecb5c2d5a25f10c122b6/2-Figure1-1.png

further info
on habitat segregation of pruinosa and costalis
https://www.tandfonline.com/doi/abs/10.1080/13887890.2012.762745

and in Japanese
https://yoda1.exblog.jp/19813772/
on cellnumbers (different approach, hopefully same result)
http://dranathis.blog.fc2.com/blog-entry-352.html

CELL COUNT important feature? (maybe a simplification on my part)
cell count may be a good feature (as odonata.jp explains) Sofar (4 june 2020) I only found one costalis male (ID based on location up north) with something that looks like bigger cells next to the pterostigma
https://www.inaturalist.org/observations/17243744

Publicado el abril 25, 2020 08:27 MAÑANA por housecrows housecrows | 4 observaciones | 1 comentario | Deja un comentario