Compound eyes of Hybomitra sp. male

Images taken in a controlled environment or with a posed subject. All subject types.

Moderators: rjlittlefield, ChrisR, Chris S., Pau

Guppy
Posts: 199
Joined: Mon Dec 20, 2010 10:36 am
Location: Switzerland
Contact:

Compound eyes of Hybomitra sp. male

Post by Guppy »

Hi

The barely colored compound eyes are fascinating,
I could not find ocellus clearly.
In this species the compound eyes are very close, like in T. autumnalis (?),
but I limit myself in the determination of the gadfly to the genus Tabanus.
The specimen had a body length of 20mm.

Image
www.focus-stacking.ch/B/05257_00.JPG

Camera: Nikon D810
Lens: Rodenstock APO Rodagon N 50mm 1:2.8, (in retro)
Exposure time: Flash
Aperture: 4.8
ISO: 64
Lighting: 4 pcs. Flash units, YONGNUO Speedlite YN560 III
Diffuser: white writing paper
Shooting file format (RAW/JPG): RAW
Bleed amount in % (width & height): 45, 5
Tripod: Reprostand
Shooting date: 20.06.2021
Region/Place: Switzerland / Bern
Found habitat: Dead Found in apartment
Genus: Hybomitra sp. male
Multishot technique: Stack
Stacking Software / Method: Zerene Stacker / PMax
Imaging scale: 2:1
Number of stack steps: 180
Average stack step size (mm) with Cognisys StackShot: 0.05

Kurt
Last edited by Guppy on Thu Jun 24, 2021 9:09 am, edited 1 time in total.

MarkSturtevant
Posts: 1255
Joined: Sat Nov 21, 2015 6:52 pm
Location: Michigan, U.S.A.
Contact:

Re: Compound eyes of Tabanus

Post by MarkSturtevant »

Very well done! This is likely a male, since they have larger eyes than females. Effectively its just one big compound eye. The ocelli will be clustered at the top of the head. Right at the North Pole in this picture.
Mark Sturtevant
Dept. of Still Waters

Guppy
Posts: 199
Joined: Mon Dec 20, 2010 10:36 am
Location: Switzerland
Contact:

Re: Compound eyes of Tabanus

Post by Guppy »

Hi Mark
I still have this perspective,
but I don't see any actual ocelli there,
or are they too small for this scale?
.... Or is it the three dark spots between the white short hairs?
Thanks a lot

Image

Kurt

MarkSturtevant
Posts: 1255
Joined: Sat Nov 21, 2015 6:52 pm
Location: Michigan, U.S.A.
Contact:

Re: Compound eyes of Tabanus

Post by MarkSturtevant »

Its the 3 spots. I guess.
Mark Sturtevant
Dept. of Still Waters

NikonUser
Posts: 2667
Joined: Thu Sep 04, 2008 2:03 am
Location: southern New Brunswick, Canada

Re: Compound eyes of Tabanus

Post by NikonUser »

Tabanids in the SubFamily: Tabaninae include the genera Tabanus and Hybomitra.
Ocelli are absent in this SF, or at most vestigial.
What you are seeing in your male is called an 'ocellar tubercle'. A structure not seen in the genus Tabanus.
Your fly is a male Hybomitra sp.
NU.
student of entomology
Quote – Holmes on ‘Entomology’
” I suppose you are an entomologist ? “
” Not quite so ambitious as that, sir. I should like to put my eyes on the individual entitled to that name.
No man can be truly called an entomologist,
sir; the subject is too vast for any single human intelligence to grasp.”
Oliver Wendell Holmes, Sr
The Poet at the Breakfast Table.

Nikon camera, lenses and objectives
Olympus microscope and objectives

Guppy
Posts: 199
Joined: Mon Dec 20, 2010 10:36 am
Location: Switzerland
Contact:

Re: Compound eyes of Hybomitra sp. male

Post by Guppy »

Hi Nikonuser

This is an appropriate answer,
male of Hybomitra sp.
so everything is clear!
As far as I can, I put it right.

Thank you very much.
Kurt

Post Reply Previous topicNext topic