Gallery Links
Users Online
· Guests Online: 8

· Members Online: 0

· Total Members: 4,739
· Newest Member: pavels
Forum Threads
Theme Switcher
Switch to:
Last Seen Users
· zdanko05:17:53
· weia06:45:50
· John v06:46:14
· Tony Irwin06:58:26
· Morten A Mjelde07:06:38
· Juergen Peters07:23:15
· Arthur van O...08:15:27
· ESant08:35:28
· runetk08:37:54
· sd08:40:20
Latest Photo Additions
View Thread :: Identification queries :: Diptera (adults)
Who is here? 1 guest(s)
 Print Thread
Drosophilidae? subfamily/ genus identification possible?
#1 Print Post
Posted on 08-11-2021 02:51

Posts: 21
Joined: 30.06.21

Hi colleagues, is my identification of this tiny fly as Drosophilidae correct? Can you help me with any further identification to subfamily/ genus level?
Sample location is a Polynesian atoll, yet this fly was collected around garden facilities (papaya, banana, various vegetables,...), so it might as well be an introduced species.

Thanks for any help and input
basti_st attached the following image:

Jan Maca
#2 Print Post
Posted on 08-11-2021 21:22

Posts: 729
Joined: 25.03.10

I would say it is the sufamily Steganinae. If I am right, the dorsal aspect of mesootum should show a pair of enlarged presutural acrostichals.
Edited by Jan Maca on 08-11-2021 21:23
John Carr
#3 Print Post
Posted on 08-11-2021 22:50
User Avatar


Location: Massachusetts, USA
Posts: 8737
Joined: 22.10.10

Also count the number of rows of acrostichals and see whether the basal scutellar bristles are divergent or convergent. If it is a common species, not recently introduced, it should be in Malloch's 1934 key: http://hbs.bishop...14-179.pdf.
#4 Print Post
Posted on 09-11-2021 10:41

Posts: 21
Joined: 30.06.21

Dear John, Dear Jan,
thanks for the input and literature recommendations. I identified this species as Drosophila nasuta, based on Malloch's 1934 key. Under greater magnification, both the short bristles on the forefemur and the single black bristle on the mid tarsus are well visible.
John Carr
#5 Print Post
Posted on 09-11-2021 12:04
User Avatar


Location: Massachusetts, USA
Posts: 8737
Joined: 22.10.10

According to the catalog Drosophila nasuta is no longer recognized from the region. Check D. sulfurigaster (Duda, 1923, originally described as genus Spinulophila) which is another member of the same species group. More specifically, D. sulfurigaster bilimbata Bezzi, 1928 is the subspecies spread across the islands.

#6 Print Post
Posted on 09-11-2021 19:24

Posts: 21
Joined: 30.06.21

John, thanks for the hint. According to Ramage 2017, the Drosophila common throughout the Soceity Islands is D. coffeina. Unfortunately, I could not find any keys that include this species or have clear illustrations, but the description of this species by Schiner 1868 read like a good match.

The (dipteran) fauna is poorly monitored here, especially on the more remote islands further away from Tahiti. I have already more than 10 new species records for French Polynesia and several more morphospecies that I still need to identify, including at least 3 morphospecies of Phoridae, one Conopidae, Hybotidae and Scatopsidae - all dipteran families that were so far unknown to occur in French Polynesia. Therefore, the literature on geographical distribution is not necessarily a good criteria to support morphological examinations.
Jump to Forum:
Similar Threads
Thread Forum Replies Last Post
Family + genus? => Heteromeringia nigrimana (Clusiidae) Diptera (adults) 5 20-01-2022 17:57
Tachinidae - help with identification Diptera (adults) 18 09-01-2022 13:55
Pipunculidae genus possible? Diptera (adults) 1 29-12-2021 23:06
Drosophilidae, ID please => Drosophila busckii Diptera (adults) 7 21-12-2021 09:04
Drosophilidae? Switzerland Diptera (adults) 6 19-12-2021 14:09
Date and time
22 January 2022 08:32


Not a member yet?
Click here to register.

Forgotten your password?
Request a new one here.
Temporary email?
Due to fact this site has functionality making use of your email address, any registration using a temporary email address will be rejected.

Please, help to make
possible and enable
further improvements!
Latest Articles
Syrph the Net
Those who want to have access to the Syrph the Net database need to sign the
License Agreement -
Click to Download

Public files of Syrph the Net can be downloaded HERE

Last updated: 25.08.2011
You must login to post a message.

09.01.22 17:56
Hello, I'm looking for literature on chironomid larvae that are able to survive after being entrapped in ice for at least several days . So far I've only found literature on Eretmoptera murphy

11.12.21 17:10
Dematoneura in the gallery should be DeSmatoneura

23.09.21 15:29
All sorted.

16.09.21 22:24
Sorry put 5 new threads in Asilidae forum instead in Syrphidae forum, can pleas an admin move it to Syrph? THANKS, Norbert

09.09.21 07:48

09.09.21 07:47
wing ventation is totally different

03.09.21 12:51
Hi, what's the major difference between dolichopodidae and rhagionidae? Can someone help me? Thanks!

28.06.21 15:24
thx TO eklans

03.06.21 11:11
@Tony Irwin Thank you Tony! I've emailed you there Pfft

02.06.21 22:26
Rob - can you PM me with an e-mail address, and I'll send it over.

Render time: 2.09 seconds | 160,983,861 unique visits