Osmia from NE Iberia --> Osmia cf. melanogaster

Osmia from NE Iberia --> Osmia cf. melanogaster

Postby rafael_carbonell on 13 Jan 2018, 10:46

Found dead, July 12th 2005. [Catalonia: Girona: Beuda: 400 m a.s.l.]. Body length about 10 mm (= 208/20). Front wing length 8 mm (= 165/20).
I got to Osmia (Helicosmia) following different keys (including UK Bees key Bwars for genus, Michener for subgenus, Pauly for Belgium species).
It looks similar to Osmia leaiana, but:
a) The edge of the clip is straight or a bit sinuated, with a short apical tooth (not two teeth).
b) The scopa hair of the gaster is dark brown, not orange, and I don’t think that over time they get dark.

Which is the best subgenus key for Osmia?

A full resolution picture is here:
https://www.flickr.com/photos/47899925@ ... ed-public/
Attachments
Osmia leaiana 20050712 f MTm.jpg
Last edited by rafael_carbonell on 18 Jan 2018, 00:47, edited 3 times in total.
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Re: Osmia not leaiana from NE Iberia

Postby Darek Ogrodnik on 13 Jan 2018, 15:24

I think this is Osmia melanogaster or close (labialis?) ==> Osmia cf. melanogaster :D
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Re: Osmia not leaiana from NE Iberia

Postby rafael_carbonell on 13 Jan 2018, 18:20

Thank you very much, Darek !! :D :D :D
I'm happy it can be identified.

1) From Helicosmia subgenus, do you know which keys would be more appropiate?
2) Which characteristics should be necessary to get to that species?

At least Benoist 1931 is online: (Osmia melanogaster as Osmia notata)=Benoist, R. (1931) Les osmies de la faune française (Hymenopt. Apidae). Annales de la Société Entomologique de France, 100, 23-60:
http://gallica.bnf.fr/ark:/12148/bpt6k5 ... caise.zoom


Best wishes,

Rafael
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Re: Osmia from NE Iberia --> Osmia cf. melanogaster

Postby rafael_carbonell on 15 Jan 2018, 22:46

Found dead, July 12th, 2005. [Catalonia: Girona: Beuda: 400 m a.s.l.]. Body length about 10 mm (= 208/20). Front wing length 8 mm (= 165/20).

HEAD:
Antenna with 12 segments. Face without outings or horns. Tegument on the black face, with white hairs. Depression across mandibular base deep and abruptly set off almost vertically from adjacent flat mandibular surface. Mandibles short, widening towards apex; at rest, upper edge of mandibles fitting closely against edge of clypeus. Labrum longer than wide but not projecting below apices of closed mandibles; labrum with long and erect hairs, dark brown colored. Tongue long, pointed at apex. Head without small depression immediately behind lower end of eye. Apical edge of clypeus arched, with a tooth in the middle. Orange hairs covering parts of the mandibles and below clypeal margin; those beneath clypeal margin arranged in four tufts: two narrow tufts at the middle and two broad ones at sides.

MESOSOME:
Mesosome with clear hairs. Thorax long: scutal length (= 51/20 mm) less than intertegular distance (= 61/20 mm). Scutum with parapsidal lines punctiform, short (=7/40 mm), at most one fifth as long as tegula (=37/40 mm), appearing as a raised, flattened area usually distinct from surrounding punctures. Posterolateral corner of scutum with strong marginal carina, pubescence absent lateral to carina. Anterior edge of metanotum below level of most of scutellum, scutellar surface curved down to margin of metanotum. Rear end of scutellum without teeth. Propodeal area subvertical and smooth.

METASOME:
Metasome rounded up convexly dorsally. First tergite of gaster more-or-less smoothly curved from dorsal surface to anterior face, without a distinct transverse keel. Dark brown or black scopa present underside of gaster. Tergites apically with white haired bands, mostly at sides.

WINGS: Forewing wing with two submarginal cells. Vein 2m-cu meets M opposite or pre-furcal second submarginal cell. Stigma almost twice as long as wide.

LEGS: Legs black, without yellow markings. Arolium present between the tarsal claws. Claws simple.

Determination following Bwars Book, 2012, Michener 2000, Pauly 2015 Megachilidae for Belgium.
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Re: Osmia from NE Iberia --> Osmia cf. melanogaster

Postby Christian on 17 Jan 2018, 20:29

Always difficult with these descriptions, and also we do not have any expert for Mediterranean bees here.

Best wishes, Christian
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Re: Osmia from NE Iberia --> Osmia cf. melanogaster

Postby Darek Ogrodnik on Yesterday, 12:41

For Megachilidae I use only Polish key (Banaszak, Romasenko, Cierzniak 2001). http://www.biomap.pl/en/getpdf/KdOOP_Hy ... nr_161.pdf
Osmia melanogaster doesn't occur in PL, yet it is included in the key as a potential species; the most important features of O. melanogaster females are clypeus(shape of the lower edge + punctures), propodeum structure(esp. metapostnotum), black scopa, lack of apical hair bands on the tergites(in contrast to e.g. O. caerulescens, gallarum and many others) and your specimen fits this description. O. notata is different species and that French key includes not only Osmia but also Hoplitis.
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