Placostegus sp.

Kočí, Tomáš & Jäger, Manfred, 2015, Sabellid And Serpulid Worms (Polychaeta, Canalipalpata, Sabellida, Sabellidae, Serpulidae) From The Rocky Coast Facies (Late Cenomanian) At Předboj Near Prague, Acta Musei Nationalis Pragae Series B 71 (1 - 2), pp. 31-50 : 38

Placostegus sp.

Pl. 2, Fig. 10

2012c Placostegus sp. – Kočí, p. 126, fig. 1M–N.

M a t e r i a l: Two small specimens of the attached posterior tube portion; neither the posteriormost part nor aperture are preserved.

S u b s t r a t e: Both tubes together are attached to one tube of Pyrgopolon (Septenaria) sp.

D e s c r i p t i o n. The tubes are slightly curved or meandering. The diameter increases slowly up to 1 mm. A low narrow but sharp and distinct median keel is present. One of the two tubes has a longitudinal furrow in the lower part of the latera. The transverse ornamentation consists of delicate striae which on the latera are curved forward towards the keel. The tube is subtriangular in cross-section with convex latera especially in the posterior portion. Tubulae can be detected near the damaged area anteriorly though not posteriorly.

R e m a r k s a n d r e l a t i o n s h i p s. Although the small posterior tube portions do not show many special features, comparison with similar posterior and middle portions of more completely preserved unequivocal specimens of the genus Placostegus from Velim and Kaňk makes affiliation also of the present specimens from Předboj to this genus probable. Moreover, it is possible that these specimens are juveniles of one of the other Placostegus species described in the present paper.