Plocamione spp.
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publication ID |
https://doi.org/ 10.4202/app.00612.2019 |
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persistent identifier |
https://treatment.plazi.org/id/AE74871F-B873-B724-FCF7-FF42FBF6FBDC |
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treatment provided by |
Felipe |
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scientific name |
Plocamione spp. |
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Fig. 5F–K.
Material.—Middle–upper Eocene, south-central Ukraine.
Remarks. —The spicules illustrated on the Fig. 5J, K and in Ivanik (2003: pl. 19: 3) are identical with spicules of the two raspailiid species, Plocamione carteri ( Ridley and Duncan, 1881) and P. dirrhopalina Topsent, 1927 . The skeleton of these two species possesses choanosomal acanthostrongyles (compare Hooper 2002: fig. 20d) of comparable size (50 μm in living and 34 and 45 μm in fossil representatives; Ridley and Duncan 1881: pl. 23: 19). The morphologies of the other choanosomal acanthostrongyles, illustrated on the same figure are very similar too ( Fig. 5F–I). The style from the Fig. 3Q View Fig may belong to some Plocamione species as well (compare Hooper 2002: fig. 20a). Nevertheless, its vulcanellid affinity cannot be ruled out either.
The same is true for the long acanthostyle illustrated on the Fig. 5M which resembles the spicules belonging to the recent taxon Plocamione pachysclera ( Lévi and Lévi, 1983) (compare Raspailia pachysclera Lévi and Lévi, 1983 : fig. 12.2; Hooper 2002: fig. 20j). They are identical in terms of their morphology and size. Still, similar spicules also appear in erylinid Pachymatisma monaena Lendenfeld, 1907 ( Lendenfeld 1907: pl. 35: 35).
The spicules illustrated on the Fig. 5E, L, N may belong to Plocamione as their morphology and size is comparable with some spicules of this extant genus (compare with Hooper 2002: fig. 20d).
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