Jinghediscus

Jinghediscus; Temporal range: early Middle Cambrian PreꞒ Ꞓ O S D C P T J K Pg N
	Jinghediscus nummularius
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Trilobita
Order:	Agnostida
Family:	Weymouthiidae
Genus:	Jinghediscus; Xiang & Zhang, 1985
species
	J. nummularius Xiang & Zhang, 1985 (type species) ;

Jinghediscus Xiang & Zhang, 1985 ^[1] is a genus of Eodiscinid trilobite belonging to the family Weymouthiidae Kobayashi T. (1943),^[2] Order Agnostida (Salter 1864) ^[3] It lived during the lower Middle Cambrian, with remains found in China (Xinjiang) and Australia (Queensland).

Species[edit]

Jinghediscus nummularius Xiang and Zhang, 1985.

Distribution[edit]

Description[edit]

Like all Weymouthiidae, Jinghediscus lacks eyes and facial sutures. Cephalon semi-elliptical. Glabella has one transglabellar furrow and inflated posterior lobe that widens towards rear. Preglabellar field broad (sag.) and confluent with uniformly wide (tr.) genal areas. Occipital ring (L0) ill-defined and without spine. cephalic border is only gently convex and of uniform width. Pygidium with strongly conical axis composed of ten axial rings; pleural fields smooth and defined from axis merely by a change in slope. Pygidial border broadens considerably towards rear and is wider (sag.) posteriorly than width (tr.) of the smooth pleural fields.^[4]

References[edit]

^ XIANG L. & ZHANG T. 1985. Chapter 3, Systematic description of trilobites. In: Stratigraphy and Trilobite Faunas of the Cambrian in the Western Part of Northern Tianshan, Xinjiang. Minist. Geol. Mineral Resour., Geol. Mem, Ser.2, 4: 1-243 [in Chinese with English summary].
^ KOBAYASHI T. 1943. Brief notes on the Eodiscids 1, their classification with a description of a new species and a new variety, Proceedings of the Imperial Academy, Tokyo, Volume 19, pp. 37-42.
^ SALTER, J. W. 1864: On some new fossils from the Lingula-flags of Wales. Quarterly Journal of the Geological Society of London, 20, 233–241.
^ WHITTINGON, H. B. (1997). Volume 1 – Trilobita – Introduction, Order Agnostida, Order Redlichiida. Treatise on Invertebrate Paleontology. Vol. Part O, Revised. pp. 393–394.

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[1] XIANG L. & ZHANG T. 1985. Chapter 3, Systematic description of trilobites. In: Stratigraphy and Trilobite Faunas of the Cambrian in the Western Part of Northern Tianshan, Xinjiang. Minist. Geol. Mineral Resour., Geol. Mem, Ser.2, 4: 1-243 [in Chinese with English summary].

[2] KOBAYASHI T. 1943. Brief notes on the Eodiscids 1, their classification with a description of a new species and a new variety, Proceedings of the Imperial Academy, Tokyo, Volume 19, pp. 37-42.

[3] SALTER, J. W. 1864: On some new fossils from the Lingula-flags of Wales. Quarterly Journal of the Geological Society of London, 20, 233–241.

[Treatise-4] WHITTINGON, H. B. (1997). Volume 1 – Trilobita – Introduction, Order Agnostida, Order Redlichiida. Treatise on Invertebrate Paleontology. Vol. Part O, Revised. pp. 393–394.

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