A new type of shell damage has been described in Ordovician brachiopods in Porambonites (Porambonites) laticaudata. There is a pair of small pits with somewhat different outline in the shell surface at the anterior commissure of the brachiopod. These pits are oriented in lateral direction, about 40o from the direction of the sulcus on the anterior commissure. Previously known shell damage has resulted from failed predatory attacks by durophagous predators and differ from the shell damage in P. (P.) laticaudata. The pits in the shell margin are most likely the result of shell malformation caused by the presence of symbionts. It is plausible that the symbionts of the P. (P.) laticaudata benefitted from inhalant currents and were cleptoparasites. The symbionts caused damage to the host brachiopod, which also suggests a parasitic relationship.
Alexander, R. R. 1986. Resistance to and repair of shell breakage induced by durophages in Late Ordovician brachiopods. Journal of Paleontology, 60(2), 273–285.
https://doi.org/10.1017/S0022336000021806
Baliński, A. and Sun, Y. 2010. Tubular shell infestations in some Mississippian spirilophous brachiopods. Acta Palaeontologica Polonica, 55(4), 689–694.
https://doi.org/10.4202/app.2010.0032
Bassett, M. G., Popov, L. E. and Holmer, L. E. 2004. The oldest-known metazoan parasite? Journal of Paleontology, 78, 1214–1216.
https://doi.org/10.1666/0022-3360(2004)078<1214:TOMP>2.0.CO;2
Bekker, H. 1921. The Kuckers stage of the Ordovician Rocks in NE Estonia. Acta et Commentationes Universitatis Tartuensis, II(1), 1–92.
Bengtson, S. 1968. The problematic genus Mobergella from the Lower Cambrian of the Baltic area. Lethaia, 1(4), 325–351.
https://doi.org/10.1111/j.1502-3931.1968.tb01625.x
Chatterton, B. D. 1975. A commensal relationship between a small filter feeding organism and Australian Devonian spiriferid brachiopods. Paleobiology, 1(4), 371–378.
https://doi.org/10.1017/S0094837300002670
De Baets, K., Klug, C. and Korn, D. 2011. Devonian pearls and ammonoid-endoparasite co-evolution. Acta Palaeontologica Polonica, 56(1), 159–180.
https://doi.org/10.4202/app.2010.0044
De Baets, K., Huntley, J. W., Klompmaker, A. A., Schiffbauer, J. D. and Muscente, A. D. 2021a. The fossil record of parasitism: its extent and taphonomic constraints. In The Evolution and Fossil Record of Parasitism: Coevolution and Paleoparasitological Techniques (De Baets, K. and Huntley, J. W., eds). Topics in Geobiology, 50. Springer, Cham, 1–50.
https://doi.org/10.1007/978-3-030-52233-9_1
De Baets, K., Huntley, J. W, Scarponi, D., Klompmaker, A. A. and Skawina, A. 2021b. Phanerozoic parasitism and marine metazoan diversity: dilution versus amplification. Philosophical Transactions of the Royal Society B, 376(1837), 20200366.
https://doi.org/10.1098/rstb.2020.0366
Deline, B., Baumiller, T., Kaplan, P., Kowalewski, M. and Hoffmeister, A. P. 2003. Edge-drilling on the brachiopod Perditocardinia cf. P. dubia from the Mississippian of Missouri (USA). Palaeogeography, Palaeoclimatology, Palaeoecology, 201(3–4), 211–219.
https://doi.org/10.1016/S0031-0182(03)00626-6
Dronov, A. and Rozhnov, S. 2007. Climatic changes in the Baltoscandian basin during the Ordovician: sedimentological and palaeontological aspects. Acta Palaeontologica Sinica, 46(Suppl.), 108–113.
Huntley, J. W., De Baets, K., Scarponi, D., Linehan, L. C., Epa, Y. R., Jacobs, G. S. et al. 2021. Bivalve mollusks as hosts in the fossil record. In The Evolution and Fossil Record of Parasitism: Coevolution and Paleoparasitological Techniques (De Baets, K. and Huntley, J. W., eds). Topics in Geobiology, 50. Springer, Cham, 251–287.
https://doi.org/10.1007/978-3-030-52233-9_8
Kaljo, D., Hints, L., Hints, O., Männik, P., Martma, T. and Nõlvak, J. 2011. Katian prelude to the Hirnantian (Late Ordovician) mass extinction: a Baltic perspective. Geological Journal, 46, 464–477.
https://doi.org/10.1002/gj.1301
Kiel, S. 2008. Parasitic polychaetes in the Early Cretaceous hydrocarbon seep-restricted brachiopod Peregrinella multicarinata. Journal of Paleontology, 82(6), 1215–1217.
https://doi.org/10.1017/S0022336000055426
Kiipli, E., Kiipli, T., Kallaste, T. and Ainsaar, L. 2010. Distribution of phosphorus in the Middle and Upper Ordovician Baltoscandian carbonate palaeobasin. Estonian Journal of Earth Sciences, 59(4), 247–255.
https://doi.org/10.3176/earth.2010.4.01
Kinne, O. (ed.). 1983. Diseases of Marine Animals. Vol. II. Introduction, Bivalvia to Scaphopoda. Biologische Anstalt Helgoland, Hamburg, 626–630.
LaBarbera, M. 1984. Feeding currents and particle capture mechanisms in suspension feeding animals. American Zoologist, 24(1), 71–84.
https://doi.org/10.1093/icb/24.1.71
Mironenko, A. A. 2016. A new type of shell malformation caused by epizoans in Late Jurassic ammonites from Central Russia. Acta Palaeontologica Polonica, 61(3), 645–660.
https://doi.org/10.4202/app.00100.2014
Nestor, H. and Einasto, R. 1997. Ordovician and Silurian carbonate sedimentation basin. In Geology and Mineral Resources of Estonia (Raukas, A. and Teedumäe, A., eds). Estonian Academy Publishers, Tallinn, 192–204.
Peel, J. S. 2014. Failed predation, commensalism and parasitism on lower Cambrian linguliformean brachiopods. Alcheringa, 39(2), 149‒163.
https://doi.org/10.1080/03115518.2015.964055
Rodrigues, S. C. 2007. Biotic interactions recorded in shells of recent rhynchonelliform brachiopods from San Juan Island, USA. Journal of Shellfish Research, 26(1), 241–252.
https://doi.org/10.2983/0730-8000(2007)26[241:BIRISO]2.0.CO;2
Torsvik, T. H. and Cocks, L. R. M. 2013. New global palaeogeographical reconstructions for the early Palaeozoic and their generation. Geological Society, London, Memoirs, 38, 5–24.
https://doi.org/10.1144/M38.2
Vinn, O., Wilson, M.A. and Toom, U. 2014. Earliest rhynchonelliform brachiopod parasite from the Late Ordovician of northern Estonia (Baltica). Palaeogeography, Palaeoclimatology, Palaeoecology, 411, 42–45.
https://doi.org/10.1016/j.palaeo.2014.06.028
Walcott, C. D. 1912. Cambrian Brachiopoda. Monographs of the US Geological Survey, 51.
https://doi.org/10.5962/bhl.title.45577
Zhang, Z., Holmer, L. E., Robson, S. P., Hu, S., Wang, X. and Wang, H. 2011. First record of repaired durophagous shell damages in Early Cambrian lingulate brachiopods with preserved pedicles. Palaeogeography, Palaeoclimatology, Palaeoecology, 302(3–4), 206–212.
https://doi.org/10.1016/j.palaeo.2011.01.010
Zhang, Y., Luan, X., Zhan, R., Sproat, C. D. and Huang, B. 2020a. Early parasitic drilling in a rhynchonelliform brachiopod Rongatrypa xichuanensis from the Katian (Upper Ordovician) of central China. Journal of Paleontology, 94(3), 467–474.
https://doi.org/10.1017/jpa.2019.102
Zhang, Z., Strotz, L. C., Topper, T. P., Chen, F., Chen, Y., Liang, Y. et al. 2020b. An encrusting kleptoparasite-host interaction from the early Cambrian. Nature Communications, 11, 2625.
https://doi.org/10.1038/s41467-020-16332-3
Zong, R. and Gong, Y. 2022. Malformations in Late Devonian brachiopods from the western Junggar, NW China and their potential causes. PeerJ, 10, e13447.
https://doi.org/10.7717/peerj.13447