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The zoological dry collection of the Swedish Museum of Natural History in Stockholm includes an important, historical bryozoan section that is rich in species and specimens and also diverse from a geographical point of view. This collection also contains the type specimens of the type species of some cheilostome bryozoan genera introduced by several naturalists and bryozoologists between the mid-1800s and 1900s. With a few exceptions, these have not been revised since the advent of scanning electron microscopy as a standard tool for bryozoan taxonomy. Here, the type specimen(s) of the type species of the following six cheilostome genera are described and illustrated using SEM micrographs for the first time: Cheilopora Levinsen, 1909; Fedorella Silén, 1947; Floridina Jullien, 1882; Lepraliella Levinsen, 1917; Smittipora Jullien, 1882; and Stenopsella Bassler, 1952. The type specimen(s) of the type species of the recently introduced Terwasipora Reverter-Gil & Souto, 2019 and the relatively recently revised Doryporella Norman, 1903 are also illustrated for the first time. This revision has identified some erroneous geographical records for some of the species/genera examined, and has led to the proposed synonymy of Stenopsella with Gigantopora Ridley, 1881. Lectotypes have also been selected. All of the images produced will also be publicly available through the SMNH online catalogue. The digitisation of natural history museum collections, with prioritisation of historical type specimens, is of paramount importance to facilitate access to the fundamental taxonomic units for scientists worldwide.

Genus Terwasipora Reverter-Gil & Souto, 2019 Type species Lepralia complanata Norman, 1864, Published as part of Martino, Emanuela Di, 2022, Revision of the type species of some cheilostome bryozoan genera in the collection of the Swedish Museum of Natural History, pp. 157-181 in Zootaxa 5125 (2) on page 175, DOI: 10.11646/zootaxa.5125.2.4, http://zenodo.org/record/6424502, {"references":["Reverter-Gil, O. & Souto, J. (2019) Watersiporidae (Bryozoa) in Iberian waters: an update on alien and native species. Marine Biodiversity, 49, 2735 - 2752. https: // doi. org / 10.1007 / s 12526 - 019 - 01003 - 4","Norman, A. M. (1864) On undescribed British Hydrozoa, Actinozoa and Polyzoa. Annals and Magazine of Natural History, 13, 82 - 90. https: // doi. org / 10.1080 / 00222936408681578"]}

Terwasipora complanata (Norman, 1864) (Fig. 10) Lepralia complanata Norman, 1864: 85, pl. 10, fig. 4. Terwasipora complanata: Reverter-Gil & Souto 2019: 2743, figs 5, 6. Material examined. Holotype by monotypy SMNH-Type-1772, North Atlantic Ocean, Ireland, encrusting a rock. Leg. unknown. Remarks. The description of this species is omitted because accurate descriptions are available in several papers, some very recent (e.g. Reverter-Gil & Souto 2019, Ramalho et al. 2022). However, the original material described by Norman (1864) has never been described and/or illustrated. The syntype SMNH-Type-1772 (Fig. 10A) consists of a fan-shaped colony, about 5.8 x 8.6 mm, encrusting a granitic rock, about 9 x 11.5 cm, sharing the substrate with spirorbid polychaetes. Norman (1864) acknowledged having found the specimen in the collection of British Zoophytes of his late friend Mr. Barlee that he inherited. This information agrees with the label (Fig. 10B), as does the description of the substrate provided by Norman (1864) as coarse-grained granite. While Norman (1864) claimed not to have detailed information about the collecting locality, apart from being British, the label reports Ireland as the probable origin, which seems plausible given that the geology of the northern coast of Ireland is characterized by igneous rocks and granitic intrusions. This species has a wide Atlanto-Mediterranean distribution. Confirmed records are from the Isles of Scilly (off Cornwall, England) encrusting shells and rocks (Hayward & Ryland 1999), several localities along the Atlantic Iberian coast (Reverter-Gil & Souto 2019), the Strait of Gibraltar (e.g. López de la Cuadra 1991), the Alboran Sea (Ramalho et al. 2022), and the western Mediterranean (Gautier 1962, Novosel & Pozar-Domac, 2001, Rosso & Di Martino 2016)., Published as part of Martino, Emanuela Di, 2022, Revision of the type species of some cheilostome bryozoan genera in the collection of the Swedish Museum of Natural History, pp. 157-181 in Zootaxa 5125 (2) on pages 175-176, DOI: 10.11646/zootaxa.5125.2.4, http://zenodo.org/record/6424502, {"references":["Norman, A. M. (1864) On undescribed British Hydrozoa, Actinozoa and Polyzoa. Annals and Magazine of Natural History, 13, 82 - 90. https: // doi. org / 10.1080 / 00222936408681578","Reverter-Gil, O. & Souto, J. (2019) Watersiporidae (Bryozoa) in Iberian waters: an update on alien and native species. Marine Biodiversity, 49, 2735 - 2752. https: // doi. org / 10.1007 / s 12526 - 019 - 01003 - 4","Ramalho, L. V., Rodrigues-Aporta, R. & Gofas, S. (2022) Preliminary account on the bryozoans of the Alboran platform (Western Mediterranean), with description of two new species. Zootaxa, 5094 (1), 53 - 91. https: // doi. org / 10.11646 / zootaxa. 5094.1.2","Hayward, P. J. & Ryland, J. S. (1999) Cheilostomatous Bryozoa. Part 2. Hippothoidea - Celleporoidea. Synopses of the British Fauna. New Series. Vol. 14. Field Studies Council, Shrewsbury, 416 pp.","Lopez de la Cuadra, C. M. (1991) Estudio sistematico de los Briozoos Queilostomados (Bryozoa: Cheilostomida) del Estrecho de Gibraltar y areas proximas. PhD Thesis. Universidad de Sevilla, Sevilla, 239 pp.","Gautier, Y. V. (1962) Recherches ecologiques sur les Bryozoaires chilostomes en Mediterranee occidentale. Recueil des travaux de la Station marine d'Endoume, 38, 1 - 434.","Novosel, M. & Pozar-Domac, A. (2001) Checklist of Bryozoa of the Eastern Adriatic Sea. Natura Croatica, 10, 367 - 421.","Rosso, A. & Di Martino, E. (2016) Bryozoan diversity in the Mediterranean Sea: an update. Mediterranean Marine Science, 17, 567 - 607. https: // doi. org / 10.12681 / mms. 1706"]}

Genus Terwasipora Reverter-Gil & Souto, 2019 Type species Lepralia complanata Norman, 1864

Terwasipora complanata (Norman, 1864) (Fig. 12) Lepralia complanata Norman, 1864: 85, pl. 10, fig. 4. Watersipora complanata: Zabala 1986: 395, fig. 128; Hayward & Ryland 1999: 192, figs 74b, 75; Reverter-Gil & Fern��ndez- Pulpeiro 2001: 122; De Blauwe 2009: 372, figs 397, 398; Reverter-Gil et al. 2014: 26. Terwasipora complanata: Reverter-Gil & Souto 2019: 2743, figs 5, 6, 8. Material examined. MNCN 25.03/4282: BV12, 112��� 120 m; UMA coll.; one dead fragment on shell; MNCN 25.03/4283: BV12, 112��� 120 m; UMA coll.; four living fragments on shell and three loose dead fragments. Remarks. Several specimens from the Mediterranean Sea assigned to T. complanata were reviewed by Reverter- Gil & Souto (2019), who maintained as valid the records of this species from Catalonia and the Strait of Gibraltar (Zabala 1986; L��pez de la Cuadra & Garc��a-G��mez 1988; L��pez de la Cuadra 1991; see Reverter-Gil & Souto 2019 for comments about its geographic distribution). The Alboran colonies have slightly smaller zooids (L 600���800 ��m x W 350���600 ��m) but within the range reported by Reverter-Gil & Souto (2019)., Published as part of Ramalho, La��s V., Rodr��guez-Aporta, Raquel & Gofas, Serge, 2022, Preliminary account on the bryozoans of the Alboran platform (Western Mediterranean), with description of two new species, pp. 53-91 in Zootaxa 5094 (1) on pages 76-77, DOI: 10.11646/zootaxa.5094.1.2, http://zenodo.org/record/5964865, {"references":["Norman, A. M. (1864) On undescribed British Hydrozoa, Actinozoa and Polyzoa. Annals and Magazine of Natural History, Series 3, 13 (73), 82 - 90. https: // doi. org / 10.1080 / 00222936408681578","Zabala, M. (1986) Fauna dels Briozous dels Paisos Catalans. Institut d'Estudis Catalans, Arxius de la Seccio de Ciencies, Barcelona, 836 pp.","Hayward, P. J. & Ryland, J. S. (1999) Cheilostomatous Bryozoa. Part 2, Hippothooidea - Celleporoidea. In: Barnes, R. S. K. & Crothers, J. H. (Eds.), Synopses of the British Fauna. New Series. The Linnean Society of London, London, pp. 1 - 416.","Reverter-Gil, O., Souto, J. & Fernandez-Pulpeiro, E. (2014) Annotated checklist of Recent marine Bryozoa from continental Portugal. Nova Acta Cientifica Compostelana, Bioloxia, 21, 1 - 55.","Reverter-Gil, O. & Souto, J. (2019) Watersiporidae (Bryozoa) in Iberian waters: an update on alien and native species. Marine Biodiversity Records, 49, 2735 - 2752. https: // doi. org / 10.1007 / s 12526 - 019 - 01003 - 4","Hassall, A. H. (1841) Supplement to a catalogue of Irish Zoophytes. Annals and Magazine of Natural History, Series 1, 7 (45), 363 - 373. https: // doi. org / 10.1080 / 03745484109442710","Lopez de la Cuadra, C. M. & Garcia-Gomez, J. C. (1988) Briozoos queilostomados del Estrecho de Gibraltar y areas proximas. Cahiers de Biologie Marine, 29, 21 - 36."]}

The Alboran platform, located in the Alboran Sea, is an area of high productivity due to the mixture of the Atlantic and Mediterranean waters, which produce an almost permanent upwelling in the region. It has been considered one of the main biodiversity hotspots in the Mediterranean Sea. Previous taxonomic studies on bryozoans carried out around the Alboran platform mentioned a total of 127 species collected at depths between 28 and 480 m. Here we report on four Indemares (Inventario y designación de la Red Natura 2000 en áreas marinas del Estado español) samples collected in 2011 and 2012 at depths between 95 and 120 m from a biogenic gravel bottom (i.e. small rocks and shells). Sixty-eight taxa belonging to 52 genera and 34 families were identified. Two species are proposed as new (Escharella similis n. sp. and Hemicyclopora admirabilis n. sp.), eight taxa were identified only to genus level although two of them (Chorizopora sp., Hippothoa sp.) are likely to be undescribed species, and one taxon only at family level. Among the species identified, 30 are new records for the Alboran platform, 13 are new records for the Alboran Sea, and Microporella funbio is recorded for the first time in the Mediterranean Sea. These results covered only a small part of the material sampled (4 out of 44 samples), which suggests that the number of bryozoan species in the Alboran platform is even higher, and also shows the importance of this area for “bryodiversity”.