Crazyhen Posted November 30, 2017 Share Posted November 30, 2017 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. Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted November 30, 2017 Share Posted November 30, 2017 Whatever this is it looks genuine to me, but I don't think it's a horseshoe crab. I've never seen one with a bifurcated telson. I think it's some other type of arthropod. 4 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
LordTrilobite Posted November 30, 2017 Share Posted November 30, 2017 Looks a bit like a Triops to me. So yeah, not a Horseshoe crab. 7 Olof Moleman AKA Lord Trilobite Link to comment Share on other sites More sharing options...
Fossildude19 Posted November 30, 2017 Share Posted November 30, 2017 I agree - it is a Notostracan. Also known as a "tadpole shrimp" or "shield shrimp". 6 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
-Andy- Posted November 30, 2017 Share Posted November 30, 2017 It's a Triops. The fossil ones from China I've seen are always Weichangiops sp. 3 Looking forward to meeting my fellow Singaporean collectors! Do PM me if you are a Singaporean, or an overseas fossil-collector coming here for a holiday! Link to comment Share on other sites More sharing options...
oilshale Posted November 30, 2017 Share Posted November 30, 2017 There are several places in China where you can find horseshoe crabs - Yunnanolimulus luopingensis Zhang, Hu, Zhou, Lu & Bai, 2009 from the Triassic of Yunnan seems to be the most common.l Weichangopsis from the Cretaceous of Liaoning has two soft tail spines - Yunnanolimulus got only one hard spine. 7 Be not ashamed of mistakes and thus make them crimes (Confucius, 551 BC - 479 BC). Link to comment Share on other sites More sharing options...
doushantuo Posted November 30, 2017 Share Posted November 30, 2017 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 The Yixian notostracan Chenops Link to comment Share on other sites More sharing options...
oilshale Posted December 1, 2017 Share Posted December 1, 2017 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. 2 Be not ashamed of mistakes and thus make them crimes (Confucius, 551 BC - 479 BC). Link to comment Share on other sites More sharing options...
Ludwigia Posted December 1, 2017 Share Posted December 1, 2017 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. 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.... Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
oilshale Posted December 1, 2017 Share Posted December 1, 2017 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. Be not ashamed of mistakes and thus make them crimes (Confucius, 551 BC - 479 BC). Link to comment Share on other sites More sharing options...
abyssunder Posted December 1, 2017 Share Posted December 1, 2017 " 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. 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 4 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
abyssunder Posted December 1, 2017 Share Posted December 1, 2017 " 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. " 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 3 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
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