jeremyr's picture

Tephrochlamys rufiventris

Observed: 27th January 2013 By: jeremyrjeremyr’s reputation in Invertebratesjeremyr’s reputation in Invertebratesjeremyr’s reputation in Invertebratesjeremyr’s reputation in Invertebratesjeremyr’s reputation in Invertebrates
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dorsal view
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Description:

Found inside the bathroom window - outdoor temp 10 degrees C.
An image of Tephrochlaena for comparison, showing pre-sutural dorso-central bristles

Identifications
Species interactions

No interactions present.

Comments

ophrys's picture

Key

Did you find a key to heleomyzids, then?

Ian
_________________

My Flickr photos...

http://www.flickr.com/photos/52163027@N02/

jeremyr's picture

key

not yet, but John refers to it in notes here:
http://www.ispot.org.uk/node/311492

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ophrys's picture

Thanks

Yes...that's why I asked...hoped you might have found one somewhere!

Smart looking fly...I tend to let the heleomyzids go, at the moment.

Ian
_________________

My Flickr photos...

http://www.flickr.com/photos/52163027@N02/

jeremyr's picture

Collin '43

"GENERA
14 (15) Only three strong dorsocentrals, all postsuteral .............Tephrochlamys Lw.

15 (14) One pre- and three post-suteral dorsocentrals, all nearly equally strong ..............................Tephrochlaena Cz.

SPECIES
Tephrochlamys Loew

1 (2) Face often darkened, very short and concave with front mouth margin very decidedly produced. Male with base of last joint of arista and front tarsi decidedly dilated ................................tarsalis

2 (1) Not as above.

3 (4) Base of costal stigma (beneath end of mediastinal vein) darkened as in previous species. Anterior of three strong postsuteral dorsocentral bristles further from suture (nearer to second bristle)......flavipes Ztt.

4 (3) Stigma uniformly yellowish. Anterior strong dorsocentral bristle nearer to suture and further from second bristle.

5 (6) Anterior strong dorsocentral bristle almost as long as others, and acrostichal microchetae between this front pair more than quadriserial.

a (b) Thoracic disc brownish-grey; third antennal joint reddish-brown ...............................rufiventris Mg.
b (a) Thorax lighter grey but third antennal joint blacker ............var. canescens Mg.

6 (5) Anterior dorsocentral bristle much smaller than one behind it, and acrostichal microchetae between this pair only quadriserial ........................laeta Mg.

T. tarsalis and flavipes may be bred from old birds' nests.
T. rufiventris is a very common species and often found on windows, even during mild weather in the winter. The var. canescens has been bred by Mr. E. B. Basden from rabbits' nests. There appears to be a difference, in this variety, from the typical form in the greater number of bristles on the tergal shell of hypopygium. Small specimens may only have four rows of acrostichal microchetae. The fact that it may well be the Leria cuniculorum of Desvoidy should not be overlooked.

T. leata Mg. - The only specimens I can refer to this somewhat doubtful species are two males taken by Mr. Verrall at Upware (Cambs.) on July 11th, 1875."

(from Collin, J.E. 1943b. The British species of Helomyzidae (Diptera). Entomologist's monthly Magazine 79: 234-251)

Thanks to Mydaea in the forum for helping unpack some apparently archaic terminology. Interesting that on image 5 (dorsal view) 'hexiserial' microchetae between the anterior pairs of dc bristles appear to thin to quadriserial between following pairs

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ophrys's picture

Tephrochlaena

Superb pictures on that link to Tephrochlaena, but it looks as if it has been pinned with a 6" nail!

Ian
_________________

My Flickr photos...

http://www.flickr.com/photos/52163027@N02/

jeremyr's picture

Tephrochlaena

those images are stacked, aren't they, plus a posh lens? I'm still taking hand-held images of specimens so must try fixed-positioning the camera and lowering the aperture etc to get better depth

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