Filograna sp.

Sanfilippo, Rossana, Rosso, Antonietta, Reitano, Agatino & Insacco, Gianni, 2017, First record of sabellid and serpulid polychaetes from the Permian of Sicily, Acta Palaeontologica Polonica 62 (1), pp. 25-38 : 29

Filograna sp.

Fig. 3 .

Material.—Two loose aggregates of few sub-parallel tubes, encrusting sponges (MSNC 4524, MSNC 4525). All specimens come from “Pietra di Salomone” Limestone, the Sosio Valley, western Sicily ( Italy); Wordian to upper Permian.

Description.—The examined specimens are aggregates composed of a low number of slightly curved sub-parallel tubes attached for all of their length and growing more or less close to each other. Tubes are circular in cross-section and small, with outer diameter of 0.25 to 0.40 mm, increasing very slowly. The outer surface is smooth, with only feeble growth lines visible at places. A Y-shaped ramification of a single tube due to asexual reproduction has been observed. Diagenetic recrystallization biased the original structure of the tube, and its wall is not always distinguishable from the inner filling, since large crystals occur from the outer surface towards the lumen.

Remarks.—Examined specimens can be assigned to the genus Filograna mostly based on the occurrence of bifurcating tubes. Nevertheless, the scarcity of specimens and diagnostic characters do not allow a specific determination. Tubes of Filograna , very simple and smooth, resemble those of Glomerula , found at the same studied locality, but have a slightly larger diameter and are not characteristically coiled to form aggregates.

Figures

Fig. 3. Serpulid Filograna sp. from the Sosio Valley, western Sicily (Italy), Wordian to upper Permian. A. MSNC 4524, set of subparallel tubes on a sponge. Photograph (A1), SEM image showing a Y bifurcation of a tube (A2). B. MSNC 4525, slightly curved tubes on a sponge.