caa a22 4500 386384800 CHVBK 20180307112055.0 cr unu---uuuuu 161130s1989 xx s 000 0 eng 10.1017/S0263593300012256 doi S0263593300012256 pii (NATIONALLICENCE)cambridge-10.1017/S0263593300012256 Trilobites from the Upper Ordovician Tangtou Formation, Jiangsu Province, China [Elektronische Daten] Forty-one species assigned to thirty-seven named genera of trilobites are described from the Tangtou Formation at Tangshan and Lunshan, in Jiangsu Province, SE China. Nankinolithus nankinensis Lu, the Zone fossil of the upper part of the Formation, is abundant. Many Tangtou Formation species occur also in the Huangnehkan, Linhsiang and Chiencaokou formations, and all are considered to be of early Ashgill age. The trilobites are closely related to those of the Staurocephalus clavifrons Zone (Rawtheyan) of Poland, demonstrating the long duration and wide extent of deeper water faunas. There are also close links with the Ashgill faunas of Central Asia. One new species, Amphitryon cheni, is established. The following morphological features are described: a small remopleuridine hypostome is unlike any other in construction; Nileus transversus retains genal spines to full grown size in some specimens, but loses them in others; the hypostome lacks the posteromedian cusp of other species. The hypostome of Paraphillipsinella is strongly styginid in conformation, and unlike that of Phillipsinella. Telephina convexa is the only species known with three spines on the librigena. The arrangement of pits in Nankinolithus nankinensis, the type species, is described, including illustrations of the irregularities which occur in every fringe. A small bulb at the tip of the hypostome of Ovalocephalus (= Hammatocnemis) bears two backwardly pointing spinules, one above the other, on the vertical posterior margin. Three types of protaspides, and numerous meraspid parts are described. Copyright © Royal Society of Edinburgh 1989 Ashgill nationallicence cranidium nationallicence fixigena nationallicence hypostome nationallicence librigena nationallicence ontogeny nationallicence palaeoecology nationallicence Tripp Ronald P. Ronald P. Tripp, Department of Invertebrate Palaeontology, Royal Ontario Museum, 100 Queen's Park, Toronto, Canada M5S 2C6. Zhou Zhiyi Zhiyi Zhou, Nanjing Institute of Geology and Palaeontology, Academia Sinica, 39 East Beijing Road, Nanjing 210008, People's Republic of China. Pan Zhenqin Zhenqin Pan, Regional Geological Surveying Team of Jiangsu Province, Nanjing, People's Republic of China. Transactions of the Royal Society of Edinburgh: Earth Sciences Royal Society of Edinburgh Scotland Foundation 80/1(1989), 25-68 0263-5933 80:1<25 1989 80 TRE https://doi.org/10.1017/S0263593300012256 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0263593300012256 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tripp Ronald P. Ronald P. Tripp, Department of Invertebrate Palaeontology, Royal Ontario Museum, 100 Queen's Park, Toronto, Canada M5S 2C6 NATIONALLICENCE 700 1- Zhou Zhiyi Zhiyi Zhou, Nanjing Institute of Geology and Palaeontology, Academia Sinica, 39 East Beijing Road, Nanjing 210008, People's Republic of China NATIONALLICENCE 700 1- Pan Zhenqin Zhenqin Pan, Regional Geological Surveying Team of Jiangsu Province, Nanjing, People's Republic of China NATIONALLICENCE 773 0- Transactions of the Royal Society of Edinburgh: Earth Sciences Royal Society of Edinburgh Scotland Foundation 80/1(1989), 25-68 0263-5933 80:1<25 1989 80 TRE CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge