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Crazyhen

Chinese Horseshoe Crab Fossil?

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Crazyhen

Any idea what species of horseshoe crab is that (or is it genuine)?  Is horseshoe crab fossil very rare? The specimen was said to be collected from Hebei, China.

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-Andy-

It's a Triops. The fossil ones from China I've seen are always Weichangiops sp.

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doushantuo

Sizewise,maybe a (nebalimorph)leptostracan?

Spinicaudatan?

Edit:notostracans in the 5-6 cm size range do exist,so ....

I'll let it stand,because small leptostracans CAN look a bit like branchiopods

crofarsnaeriistlanthc.jpg

 

The Yixian notostracan Chenops

 

 

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oilshale

I am very sure, this is a Weichangiops from the Cretaceous. I've got 2 or 3 of them. At least two species are described: W. rotundus and W. triangularis.

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Ludwigia
20 hours ago, Crazyhen said:

Any idea what species of horseshoe crab is that (or is it genuine)?  Is horseshoe crab fossil very rare? The specimen was said to be collected from Hebei, China.

 

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There appears to be a second, smaller object in the second photo. Is it possible that this is Euproops? I know it doesn't fit the surmised stratigraphy, but....

 

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oilshale

You are right - there is a smaller object. Don't know what it is, but Euproops or other Limulidae are very unlikely to occur in the Yixian formation. The deposits consist of fresh water sediments, they are not marine deposits.

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abyssunder

" Upper Jurassic fresh-water Triopsids recently discovered from Weichang, Hebei consist of one new subfamily (Weichangiopsinae subf. nov.), two new genera (Weichangiops gen. nov. and Brachygastriops gen. nov.) and three new species (Weichangiops triangularis gen. et sp. nov., W. rotundus gen. et sp. nov. and Brachygastriops xinboensis gen. et sp. nov.) Family Triopsidae Martalent,1935 is emended to include species having a single eye, broadly rounded carapace, denticulate posterior marginal notch and entire abdomen without being differentiated into anterior and posterior portions. It may be divided into two subfamilies: subf. Triopsinae Martalent 1935 and the newly erected subf. Weichangiopsinae based on having a single eye, carapace broader than long, posterior marginal notch of carapace denticulated and abdomen not differentiated into anterior and posterior portions. Generic characters include (1) the ratio of abdominal length to carapace length, (2) number of thoracic and abdominal somites, (3) appendages either foliate or needle-shaped and (4) oral apparatus when preserved.The evolution of the group is also discussed. "

 

I.thumb.jpg.559624b615bccc2598b7ae850d45561c.jpgII.thumb.jpg.c22afdf4114aeab77c1e354335e09567.jpgIII.thumb.jpg.76fed69162073001d7efad462db11b86.jpg

I. 1-2 Weichangiops triangularis
II. 1-3 Weichangiops triangularis
III. 1-3 Weichangiops rotundus, 4 Brachygastriops xinboensis

 

excerpts from a basic reference: Yang Zun-yi, Hong You-chong. 1980. Discovery of fresh-water Triopsids from the Upper Jurassic Dabeigou formation of Weichang, Hebei, China and its bearing on the classification of the family Triopsidae Martalent. Acta Palaeontologica Sinica,Vol.19 (2): 91-99

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abyssunder

" In the present paper the two species Triops hanshanensis Chen sp. nov. and T. bashuensis Duan sp. nov. from the Middle Jurassic of South China are described, and the two genera Weichangiops and Brachygastriops have been revised to Lepidurus. In addition, geographical distributions of the Mesozoic and living forms of Notostraca are also briefly discussed. "

 

5a21969b3e536_PlateI.thumb.jpg.621ea2c5946662162d5defdddf4462da.jpg5a21968c182f0_PlateII.thumb.jpg.522723b8c0e292a52c8edc73650ddf11.jpg5a21970035fea_PlateIII.thumb.jpg.b134a060d32f7386d821cd88c65faf29.jpg5a2196eecf610_PlateIV.thumb.jpg.1a8ca1624fa95d65eba1aab428268af4.jpg5a219756cceea_PlateI-IV.thumb.jpg.d8ed6bea14be862fd855e1cab93b7f4b.jpg

 

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excerpts from: Chen Pei-ji. 1985. Jurassic Triops from South China - With a discussion on the distribution of Notostraca. Acta Palaeontologica Sinica Vol. 24(3): 285-292

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