Eokosovopeltis cf. currajongensis ( Edgecombe and Webby, 2007 )

Lee, Dong-Chan, 2013, Late Ordovician trilobites from the Xiazhen Formation in Zhuzhai, Jiangxi Province, China, Acta Palaeontologica Polonica 58 (4), pp. 855-882 : 864-866

publication ID

https://doi.org/ 10.4202/app.2010.0036

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scientific name

Eokosovopeltis cf. currajongensis ( Edgecombe and Webby, 2007 )
status

 

Eokosovopeltis cf. currajongensis ( Edgecombe and Webby, 2007) View in CoL

Fig. 6H.

Material.—One pygidium from a limestone layer above the mudstone at locality 1 (repository number NIGP−152002).

Remarks.—This pygidium differs from Eokosovopeltis sp. in having much narrower pleural furrows and a narrower (tr.) axial region. It is similar to pygidia of Eokosovopeltis currahttp ://dx.doi.org/10.4202/app.2010.0036

jongensis Edgecombe and Webby (2007: fig. 4C, D, F–I); both have seven pairs of pleural ribs. Due to poor preservation, the specific identification as E. currajongensis is provisional.

Styginidae indet. sp. A

Fig. 6J.

Material.—Two thoraco−pygidia (repository number NIGP−152004).

Remarks.—The sub−circular outline and absence of pygidial pleural furrows resemble Bumastus (see Chatterton and Ludvigsen 1976: pl. 5: 12, 37). However, the presence of distinct ridge along inner margin of marginal border is not present in Bumastus . These specimens may be associated with co−occurring Meitanillaenus ? sp., since they resemble the thoraco−pygidium of Meitanillaenus binodosus Chang (1974 : pl. 81: 6). However, they have much less distinct axial furrows and lack the antero−most pair of pleural furrows.

Styginidae indet. sp. B

Fig. 6I

Material.—Two hypostomes (repository number NIGP−152003).

Remarks.—The hypostomes are of styginid (e.g., see Whittington 1988: fig. 9 for Bumastus ). They are characterized by a more pentagonal outline and a pair of short, closely−spaced spines along posterior margin. The hypostomes may be associated with co−occurring Meitanillaenus ? sp.

Chang (Zhang), W. 1974. Silurian trilobites [in Chinese]. In: Nanjing Institute of Geology and Palaeontology, Academia Sinica (ed.), Handbook of Stratigraphy and Palaeontology, Southwest China, 173 - 187. Science Press, Beijing.

Chatterton, B. D. E. and Ludvigsen, R. 1976. Silicified Middle Ordovician trilobites from the South Nahanni River area, District of Mackenzie, Canada. Palaeontographica Abteilung A 154: 1 - 106.

Edgecombe, G. D. and Webby B. D. 2007. Ordovician trilobites with eastern Gondwanan affinities from central-west New South Wales and Tasmania. Memoirs of the Association of Australasian Palaeontologists 34: 255 - 281.

Whittington, H. B. 1988. Hypostomes of post-Cambrian trilobites. Memoirs of the New Mexico Bureau of Mines and Mineral Resources 44: 321 - 339.