Summary: | Fig. 13. Sulcichnus sigillum Martinell and Domènech, 2009, a fixichnion produced by commensal polychaetes in the skeleton of caryophylliid coral Ceratotrochus (Edwardsotrochus) duodecimcostatus (Goldfuss, 1826), from the El Melah stream section, the upper part of the Argiles de Sidi Barka Formation (upper Pliocene) of Tunisia. A. INGUJ265P173. B. INGUJ265P170 in different side views (B1, B2). C. INGUJ265P175 in different side views (C1, C2). Abbreviation: Me, Maeandropolydora elegans. Published as part of Gaaloul, Nadia, Uchman, Alfred, Ali, Syrine Ben, Janiszewska, Katarzyna, Stolarski, Jarosław, Kołodziej, Bogusław & Riahi, Sami, 2023, In vivo and post-mortem bioerosion traces in solitary corals from the upper Pliocene deposits of Tunisia, pp. 659-681 in Acta Palaeontologica Polonica 68 (4) on page 674, DOI:10.4202/app.01095.2023, http://zenodo.org/record/12198539
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