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View Thread :: Identification queries :: Diptera (adults)
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Tachinidae - Gymnosoma ?
#1 Print Post
Posted on 20-08-2006 12:20

Location: Portugal
Posts: 51
Joined: 31.07.06

Last April or May I was taking some shots and saw thi fly.
I thought "another Ecthophasia" but the fly was pretty so I took the shot anyway.
The other day I was looking over the photographs again and after what I've learned here it does not look like ectophasia anymore!
Those antenna seem longer, the thorax is black with what seems lighter shoulders and the abdomen marks also don't fit those other ectophasia I've seen.

I would go for Gymnosoma, what say you? Smile

Thank you
digitalg attached the following image:

Armando Frazo
#2 Print Post
Posted on 20-08-2006 12:29

Location: Soest, NL
Posts: 18315
Joined: 21.07.04

It is a female, difficult to tell the species, due to the flash on thorax.
Best guess is G. clavatum.

Theo Zeegers
#3 Print Post
Posted on 21-08-2006 16:37

Location: Portugal
Posts: 51
Joined: 31.07.06

Thank you

I'm going (to try) to abuse Smile
I'm a bit confused how females can be told appart from males in tachinidae, I mean, the distance between the eyes doesn't do it the same way as for syrphidae (for instance) and I've seen males bigger and with relatively larger abdomens than females!
Anyone would like to share the knowledge? Smile

About the species, what would we be looking for in the thorax?
Armando Frazo
#4 Print Post
Posted on 22-08-2006 18:41

Location: Soest, NL
Posts: 18315
Joined: 21.07.04

Well, there are 2 answers

for Tachinids: look at the abdominal tip. 100 % sure
95 % sure: females have 2 pair of additional bristles on the vertex near the eyes, pointed FORWARD (the proclinate orbitals). Males don't (with 5 % exceptions)

For Gymnosoma:
Males have bicolorous thorax: front golden yellow, back black.
Females have completely black thorax.

Simple comme bonjour (once you know it)

#5 Print Post
Posted on 23-08-2006 14:20

Location: Portugal
Posts: 51
Joined: 31.07.06

Thanks a lot ...

I'm bookmarking this thread as I'm sure it won't be 'cerebrally' saved for the first time seen Grin
I might have some abdominal tips to show here sometime in the future
Armando Frazo
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