Osgoodicystis Frest & Strimple, 2011

Paul, Christopher, 2025, Generic revision of holocystitid blastozoans, Acta Palaeontologica Polonica 70 (1), pp. 125-141 : 133-134

publication ID

https://doi.org/10.4202/app.01212.2024

persistent identifier

https://treatment.plazi.org/id/911087C6-FFE2-FFCB-FCD6-C899C976FBD5

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Felipe

scientific name

Osgoodicystis Frest & Strimple
status

 

Genus Osgoodicystis Frest & Strimple in Frest et al.,

2011 Type species: Osgoodicystis bissetti Frest & Strimple in Frest et al.,

2011, by original designation, from the Lewisburg and Massie formations, Sheinwoodian (lower Silurian), SE Indiana, USA.

Species included: Type species and Holocystites wykoffi Miller, 1891 .

Emended diagnosis.—Holocystitids with six narrow orals; with five food grooves along oral sutures (simplified from Frest and Strimple in Frest et al. 2011: 92).

Remarks.—In Osgoodicystis ( Figs. 12A View Fig , 13 View Fig , 14 View Fig ) the thecal outline may be cylindrical or inverted pyriform (Frest and Strimple in Frest et al. 2011: 19, fig. 13). The thecal plates are always smooth with buried humatipores. The mouth is rounded with a reduced oral circlet ( Fig. 13 View Fig ) even though all six oral plates are present. Oral pores are present in the oral plates ( Fig. 13A View Fig 1 View Fig ). The five ambulacral facets are confined to individual facetal plates and arranged in the same manner as in Pentacystis . The food grooves pass along the sutures between orals ( Fig. 14 View Fig ). The theca has a relatively large attachment area.

Stratigraphic and geographic range.—Sheinwoodian (lower Silurian), Indiana, USA. Osgoodicystis ranges from the lower limestone of the Lewisburg Formation into the base of the Massie Formation ( Frest et al. 2011: 14, fig. 10; Brett et al. 2012).

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