Nileus sp.

Lee, Dong-Chan, 2013, Late Ordovician trilobites from the Xiazhen Formation in Zhuzhai, Jiangxi Province, China, Acta Palaeontologica Polonica 58 (4), pp. 855-882 : 862

publication ID

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

persistent identifier

https://treatment.plazi.org/id/256187AF-7B1B-FFA9-FF8F-FF70FEC0DBB4

treatment provided by

Felipe

scientific name

Nileus sp.
status

 

Nileus sp.

Fig. 6L View Fig .

Material.—One articulated specimen minus free cheeks (repository number NIGP−152007).

Remarks.—This species resembles Nileus petilus Xia, 1978 from Hubei, China (see Zhou et al. 2005: pl. 3: 9, 15, 17, 21) and Nileus huanxianensis Zhou in Zhou et al., 1982 from Gansu, China (see Zhou and Dean 1986: pl. 60: 1–6, 8, 11) in sharing a gently curved anterior branch of facial suture and similar location of palpebral lobe. This species, however, differs in having a sagittally longer cranidial portion anterior to palpebral lobe, smaller palpebral lobe, and semi−circular pygidial outline with a slightly convex forward anterior margin. In particular, the presence of shallow anterior cranidial border and the preglabellar area that does not bend downwards indicates that this might be a new species of Nileus ; the absence of anterior cranidial border and ventrally−curving anterior cranidium are typical of Nileus (see Tjernvik 1956: pl. 2: 13 for N. limbatus Brögger, 1882 ) including N. petilus and N. huanxianensis . However, more specimens are required to officially erect it as a new species.

Kingdom

Animalia

Phylum

Arthropoda

Class

Trilobita

Order

Asaphida

Family

Nileidae

Genus

Nileus

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