Pseudovermilia sp.

Słowiński, Jakub, Vinn, Olev, Jäger, Manfred & Zatoń, Michał, 2022, Middle and Late Jurassic tube-dwelling polychaetes from the Polish Basin: diversity, palaeoecology and comparisons with other assemblages, Acta Palaeontologica Polonica 67 (4), pp. 827-864 : 849-850

Pseudovermilia sp.

Fig. 11B .

Material.—Four tubes attached to rock fragments from the Callovian (Middle Jurassic) of Zalas, Polish Jura (see Table 1); GIUS 8-3589.

Description.—Tubes long (up to 50 mm), rather flat, irregularly curved, having nearly constant diameter (ca. 1 mm). Ornamentation composed of closely and regularly spaced transverse elements subdivided in the middle by a slightly thicker longitudinal crest running through the entire tube length, and two similar longitudinal crests situated at the lateral margins of the flat upper side. The combination of transverse and longitudinal ornamentation results in a regular, reticular pattern which is disturbed only by larger, slightly nodular peristomes. Some of the transverse elements are slightly curved forward near the longitudinal crests, but this curvature is not always well-developed. Structures resembling tubulae usually present within basal flanges occur uniformly throughout the entire tube.

Remarks.—The four specimens studied are assigned to the genus Pseudovermilia due to their very distinctive, reticulate tube morphology (see Hove 1975; Jäger and Lang 2017). In the Mesozoic, Pseudovermilia occurs very rarely. The genus was previously reported by Jäger and Lang (2017) from the Kimmeridgian (Upper Jurassic), based on a single specimen only. Because of a very limited material, scarce reports, and scarce occurrences, we are unable to provide a reliable specific name. It is possible that our specimens represent a new species. To the best of our knowledge this is the first report of this genus from Poland.

Figures

Fig. 11. Serpulid polychaetes from the Jurassic of Poland. A. Placostegus planorbiformis (Münster in Goldfuss, 1831) encrusting a sponge fragment from the Oxfordian of Zalas (GIUS 8-3746/8). B. Pseudovermilia sp. encrusting a rock fragment from the Callovian of Zalas (GIUS 8-3589/15). Scale bars 1 mm.