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標題: 今日岩岸生境區 - 動物8
sswroom (Simon)
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發表於 2007-5-20 20:03  資料 主頁 文集 短消息  ICQ 狀態 Yahoo!
今日岩岸生境區 - 動物8

岩岸的生境, 當然不少得它



今天在岩岸生境區見到的就是這麼多, 今天不太適合影相, 又大風, 又有雨, 所以影得不多。




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javaladybirds
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發表於 2010-12-31 00:20  資料 短消息 
Juvenile Ligia sp.

As stated by Mercury in this post, this is some Ligia. It is obviously a juvenile still (what size was it?) so I'm not sure I will be able to ID to species even once I get to know the Asian woodlice a little better, but when I take a closer look at the other Ligia on the forum, I'll try to get back to this one too.

The exact shape of the telson and uropoda may be essential in IDing - if you have any better/bigger images showing those, that might help

Of course, someone else with better knowledge of the Chinese Woodlice may be able to ID it with just a quick glance ...

[ Last edited by  javaladybirds at 2010-12-31 00:21 ]

本帖最近評分記錄
blackdogto   2010-12-31 00:32  種子  +6   實用資料 Useful information !




Cheers! Arp
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sswroom (Simon)
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發表於 2010-12-31 01:47  資料 主頁 文集 短消息  ICQ 狀態 Yahoo!
More photos are added.

The body length is around 18mm.

I hope these information might help.


圖片: _mg_4408hdcrop.jpg (2010-12-31 01:47, 112.85 K)



圖片: _mg_4411m.jpg (2010-12-31 01:47, 62.58 K)





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javaladybirds
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發表於 2010-12-31 08:18  資料 短消息 
Should be Ligia exotica

Hi Simon,

QUOTE:
Originally posted by sswroom at 2010-12-31 01:47
The body length is around 18mm.

Wow. That is rather big already. I don't suppose you included the appendages in that?

Anyway, I did a little reading and all that I can find seems to indicate that only Ligia exotica is recorded for the region. All the visible features (length of antennae and uropodes and the shape of the telson) seem to fit well for this species also and with L. exotica being a rather large species the 18mm are even still okay for a younger animal. So that all seems to come together nicely.

However, I should keep a little margin for error here as I don't have much literature on Asian woodlice and some new species or records may have been published that I don't know about. The whole of the western pacific is fairly rich with species of Ligia, most of which look so much like L. exotica that they have always been mistaken for this species historically and only recognized/described as separate species in the past few decades.

Closest to HK Ligia taiwanensis Lee, 1994 might be noteworthy (from Taiwan of course) and a number of endemic species from various Japanese islands have been described between 1979-1999. Only Ligia cinerascens Budde-Lund, 1885 (from the Kuril islands) carries an older date.

It would not be very surprising if it turns out that the some of the animals from the shores of HK that have so far been IDed as "Ligia exotica" would at some point be proven to be a new lookalike species.

The other reason for caution is that with Hong Kong being the important harbour that it is (and always has been, especially when tall ships were still made of lumber) there is always the prospect of species from the other side of the ocean hitching a ride on a vessel. This way for example the northern European Ligia oceanica has found its way to the American east coast. Of the American west coast species only Ligia baudiniana Milne Edwards, 1840 might come close morphologically, but I don't think this is one. Still, with the harbour and all one would always have to take some introduced species into account too, which makes me a bit nervous about setting you up with a "fixed" ID.

Nevertheless Ligia exotica seems to be the best option by far. Hopefully someone more savvy about Asian woodlice will be able to confirm the ID, but I should better still leave a tiny "cf." in place: Ligia cf. exotica

本帖最近評分記錄
seibuhk   2010-12-31 22:13  種子  +10   內容充實 Constructive materials !
blackdogto   2010-12-31 10:54  種子  +10   解答詳盡 Thanks for detailed explanation ...
hongkongensis   2010-12-31 10:34  種子  +10   感謝分享 Thanks for sharing !




Cheers! Arp
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