Obtusoconus Yu, 1979
publication ID |
https://doi.org/ 10.4202/app.00289.2016 |
persistent identifier |
https://treatment.plazi.org/id/03AD87A8-FF80-6D3B-FCB9-FB56643986EB |
treatment provided by |
Felipe |
scientific name |
Obtusoconus Yu, 1979 |
status |
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Genus Obtusoconus Yu, 1979 View in CoL
Type species: Obtusoconus paucicostatus Yu, 1979 ; middle Meishucunian Stage ( upper Fortunian –lower part of Cambrian Stage 2), lower Cambrian ; Yichang County, western Hubei Province, South China .
Remarks.— Obtusoconus spp. occur in the uppermost part of Assemblage Zone 2 in South China, where Yang et al. (2014) recognized a new Annelitellus yangtzensis ‒ Obtusoconus honorabilis Subzone in which the index taxa may co-occur with Obtusoconus rostriptuetus . Obtusoconus honorabilis reportedly ranges from the upper Fortunian to Cambrian Stage 4 (Anhui Province, Lengquanwang Formation; see Parkhaev and Demidenko 2010). A Latouchella ‒ Obtusoconus Assemblage Zone is known from Iran (upper part of Upper Shale Member, Soltanieh Formation, Alborz Mountains; Hamdi 1995) and correlated with upper Fortunian–Cambrian Stage 2. O. honorabilis also occurs in the upper Fortunian–Cambrian Stage 2 equivalents of western Mongolia (Voronin et al. 1982; Esakova and Zhegallo 1996; Parkhaev and Demidenko 2010). In our material, Obtusoconus cf. honorabilis is found above the first Watsonella crosbyi , in beds that would correspond to the Watsonella crosbyi Assemblage Zone of South China.
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