New sponge species from Seno Magdalena, Puyuhuapi Fjord and Jacaf Canal (Chile) Author Bertolino, Marco 71370556-B858-471C-B544-5641E2243080 Dipartimento di Scienze della Terra dell’Ambiente e della Vita (DISTAV), Università degli Studi di Genova, Corso Europa, 26 - 16132 Genova, Italy. marco.bertolino@unige.it Author Costa, Gabriele 9712037F-157D-477D-AA5E-7111C26CAE1D Dipartimento di Scienze della Terra dell’Ambiente e della Vita (DISTAV), Università degli Studi di Genova, Corso Europa, 26 - 16132 Genova, Italy. gabrielec1987@gmail.com Author Bavestrello, Giorgio 4D585539-D4B7-4EB1-ABAD-629D9A547C9E Dipartimento di Scienze della Terra dell’Ambiente e della Vita (DISTAV), Università degli Studi di Genova, Corso Europa, 26 - 16132 Genova, Italy. giorgio.bavestrello@unige.it Author Pansini, Maurizio 7F4DA865-D72F-45FA-ABC5-81187748E6BF Dipartimento di Scienze della Terra dell’Ambiente e della Vita (DISTAV), Università degli Studi di Genova, Corso Europa, 26 - 16132 Genova, Italy. pansisml@gmail.com Author Daneri, Giovanni C4E24C36-8D7E-44B2-B0C8-4BB56A4B7A2D Centro de Investigación en Ecosistemas de la Patagonia (CIEP), Moraleda 16 Coyhaique, Chile. & Programa COPAS Sur Austral Universidad de Concepción, Barros Arana, Concepción, Chile. gdaneri@ciep.cl text European Journal of Taxonomy 2020 2020-09-10 715 1 49 journal article 20981 10.5852/ejt.2020.715 775fa0af-c6d1-4679-80cc-c756b01d1743 4022397 08022AE1-B293-4D42-9733-AC4845E656B7 Hymerhabdia imperfecta Bertolino , Costa & Pansini sp. nov. urn:lsid:zoobank.org:act: FF9FC2BD-D935-4B83-B345-228C74D457B2 Fig. 2 ; Table 3 Etymology The new species is named after the presence of imperfect rhabdostyles. Type material Holotype CHILE – Puerto Cisnes • Seno Magdalena E; 44.613885° S , 72.94149° W ; depth 30 m ; 5–10 Aug. 2016 ; Marco Bertolino leg.; on a rocky cliff by scuba diving ; CILE 63 ; MSGN 60889 . Paratype CHILE – Puerto Cisnes • 1 specimen ; Seno Magdalena F (Punta Angostura) ; 44.6312,35° S , 72.904239° W ; depth 25 m ; 5–10 Aug. 2016 ; Marco Bertolino leg.; on a rocky cliff by scuba diving ; CILE 43; DISTAV. Description HABITUS. Encrusting, 5 mm thick and 5 cm long ( Fig. 2A ). Surface rugose and hispid, with visible canals converging towards oscules. Colour in life bright orange ( Fig. 2A ). Consistency of live specimens friable. SKELETON. Choanosomal skeleton formed by bundles of long styles and tylostyles with heads embedded in basal layer of rhabdostyles and sinuous sub-tylostyles. SPICULES. Megascleres: Smooth styles, long and thin, sometimes with modified heads ( Fig. 2B ), 800– (888.33)–1000 μm long and 5–(7.16)–10 μm thick. Smooth tylostyles 410–(552.5)–700 μm long and 15–(18.9)–25 μm thick ( Fig. 2C ). Rather short rhabdostyles with heads variable in shape and with pointed or round extremities ( Fig. 2D ), 140–(252.42)–415 μm long and 7.5–(9.75)–12.5 μm thick. Rhabdostyles often sinuous or modified into oxeas or strongyles ( Fig. 2E ). Habitat Species lives on a rocky cliff at a depth of 25–30 m ; Chilean fjords. Remarks Out of the nine species of Hymerhabdia previously described around the world ( Table 3 ), none have been recorded along Chilean coasts. The only species of this genus from the Southern Hemisphere is Hymerhabdia oxeata (Dendy, 1924) recorded at a depth of 183 m in northern New Zealand . Hymerabdia imperfecta sp. nov. differs from H . oxeata in having a red colour whereas in H . oxeata the colour is dark brown. As to spicules, H . oxeata has oxeas whereas the new species has tylostyles and rhabdostyles that are not present in H . oxeata . Moreover, the styles of the new species are much larger ( Table 3 ). A comparison with the other 8 species of Hymerhabdia (from the Atlantic Ocean and the Mediterranean Sea reported in Table 3 ) shows remarkable differences in presence or absence of spicules (oxeas, rhabdostrongyles, toxostrongyles) and in their shape and size.