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標題: [Other] Xylocopa spp.
nadia
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發表於 2016-10-3 21:48  資料 文集 短消息 
Xylocopa spp.

Looking at my local carpenter bee collection carefully, it appears that only three species of Xylocopa are found in Hong Kong, viz. X. dejeanii, X. nasalis and X. phalothorax.  X. tranquebarorum was occasionally reported from HK but I fail to find any authoritative reference on its morphology for identification purpose.   Previous sighting of X. tranquebarorum may be mis-identification of X. nasalis.


圖片: Xylocopa.jpg (2016-10-3 21:48, 187.48 K)


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wkcheng   2016-10-4 20:56  種子  +10   讚 Like !!
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Christophe
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發表於 2016-10-4 21:43  資料 短消息 
The difference between X. nasalis and X. tranquebarorum is in deed apparently a little tenous. Size and wing coloration help discerning the two, but there are small X. nasalis and large X. tranquebarorum. The distinctive character lies in the shape of the basitibial plate (only visible under magnification x40+). Our local specimens (large series) have been examined by myself and others abroad and have revealed the presence of both species in HK, with in fact X. tanquebarorum apparently the most abundant.
In consequence thare are 4 species of Xylocopa in HK. X. nasalis has been often confused with X. iridipennis, and X. tranquebarorum with X. auripennis; both not represented locally.
Hurd, P.D., Jr., and J.S. Moure. 1963. A classification of the large carpenter bees (Xylocopini). University of California Publication Entomology 29: 1-365, provide the keys to species.

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hkmoths   2016-10-5 13:50  種子  +30   讚 Like !!
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nadia
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發表於 2016-10-5 19:41  資料 文集 短消息 
Thanks Chris.  I've gone back to re-examine the basitibial plates of the hind legs of all the male specimens of Xylocopa nasalis and X. tranquebarorum.   Honestly speaking, the differences are not obvious. But based on the size, wing coloration and the facial colour pattern of the male, as suggested by you, the two species can be distinguished tenuously.


圖片: Leg_Page_1.jpg (2016-10-5 19:41, 137.98 K)



圖片: Leg_Page_2.jpg (2016-10-5 19:41, 135.21 K)

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nadia
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發表於 2016-10-5 19:48  資料 文集 短消息 
Typical frontal views of the heads of the 4 local species (Xylocopa nasalis, X. tranquebarorum, X. dejeanii and X. phalothorax) are presented here.


圖片: Head1.jpg (2016-10-5 19:48, 168.26 K)



圖片: Head2.jpg (2016-10-5 19:48, 164.47 K)

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Christophe
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發表於 2016-10-5 20:09  資料 短消息 
How lucky...you have time to take pictures...
The basitibial plate should be examined on females, yes the difference is tenous, but sufficient. Both species are of the same subgenus Biluna anyhow
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Christophe
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發表於 2016-10-19 00:51  資料 短消息 
I've just noticed that the pics you've taken are of the basal part of the basitarsus not the tibia.
There is actually a better way to distinguish the two species is by comparing the intra antennal space and the shape of the bulge at this level, which is noticeably different on the two species, particularly if viewed laterally: nearly acute with sommital angle <90 degree  in X. nasalis and hardly prominent with sommital angle >120 degree in X. tranquebarorum

However, size and wing coloration remain good indicators and in most cases can distinguish the species

[ Last edited by  Christophe at 2016-10-19 00:53 ]
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