New Skeleton-Less Homoscleromorphs (Porifera, Homoscleromorpha) From The Caribbean Sea: Exceptions To Rules Are Definitely Common In Sponge Taxonomy Author Ruiz, Cesar Institut Méditerranéen de Biodiversité et d’Ecologie marine et continentale, UMR 7263 CNRS, Aix Marseille Université, IRD, Avignon Université, Station Marine d’Endoume, Chemin de la Batterie des Lions, 13007, Marseille, France. Author Ereskovsky, Alexander 0000-0003-1079-7204 Institut Méditerranéen de Biodiversité et d’Ecologie marine et continentale, UMR 7263 CNRS, Aix Marseille Université, IRD, Avignon Université, Station Marine d’Endoume, Chemin de la Batterie des Lions, 13007, Marseille, France. & Faculty of Biology, Saint-Petersburg State University, Universitetskaya emb. 7 / 9, 199034, Saint-Petersburg, Russia alexander. ereskovsky @ imbe. fr; https: // orcid. org / 0000 - 0003 - 1079 - 7204 alexander.ereskovsky@imbe.fr Author Perez, Thierry Institut Méditerranéen de Biodiversité et d’Ecologie marine et continentale, UMR 7263 CNRS, Aix Marseille Université, IRD, Avignon Université, Station Marine d’Endoume, Chemin de la Batterie des Lions, 13007, Marseille, France. text Zootaxa 2022 2022-10-27 5200 2 128 148 journal article 173542 10.11646/zootaxa.5200.2.2 d7d3ebe5-aea6-43c4-839c-18cabe9abe4e 1175-5326 7256790 E0D67501-60EB-43EA-BD3C-C6F9BB559DE7 Oscarella minka sp. nov. Etymology : From the Quechuan mink’a ( minga ), this species name honors the pre-Columbian tradition of communal work for social purposes. Diagnosis : Thin crust less than 3 mm thick. Smooth surface. Ectosome 25 to 50 µm thick, well-developed mesohyl. Two types of vacuolar cells, leuconoid aquiferous system with diplodal choanocyte chambers. High abundance of prokaryotic symbionts in the mesohyl. Examined material: Holotype : Muséum National d’Histoire Naturelle de Paris , France MNHN DJV206 La Martinique , “Grotte Fer à Cheval” ( 14°27.882’ N , 61°01.162 W ), 19 m depth , on a vertical wall in the semi-dark part of the cave, date 25/03/2012 , sample code: 120325 MT4 b-TP8, collector: T . Pérez. Genbank accession number: MK 949481 Paratype : Muséum National d’Histoire Naturelle de Paris , France MNHN DJV207 Bequia , The Grenadines , “Full Moon Cave” ( 12°59.525’ N , 61°16.731’ W ), 10-12 m depth , beneath an overhang, date 19/05/2015 , sample code: 150519LG1-CR9, collector: C. Ruiz. Genbank accession number: MK 949480 Other material examined: Martinique , “Grotte Zeb” ( 14°27.832’N , 61°01.065’W ), 19 m depth , on a vertical wall in the semi-dark part of the cave, date 13/06/2011 , sample code: 110613 MT4 -TP4, collector: T. Pérez. GenBank accession number: MK 949478 Martinique , “Grotte Zeb” ( 14°27.832’N , 61°01.065’W ), 19 m depth , on a vertical wall in the semi-dark part of the cave, date 15/05/2015 , sample code: 150515 MT4 - CR2, collector: C. Ruiz. Genbank accession number: MK 949479 Martinique , “Grotte Zeb” ( 14°27.832’N , 61°01.065’W ), 19 m depth , on a vertical wall in the semi-dark part of the cave, date 13/06/2011 , sample code: 110613 MT4 -TP6, collector: T . Pérez . Martinique , “Grotte Zeb” ( 14°27.832’N , 61°01.065’W ), 19 m depth , on a vertical wall in the semi-dark part of the cave, date 16/05/2015 , sample code: 150516 MT4 -CR11, collector: C. Ruiz. Martinique , “Grotte Zeb” ( 14°27.832’N , 61°01.065’W ), 19 m depth , on a vertical wall in the semi-dark part of the cave, date 16/05/2015 , sample code: 150516 MT4 -CR16, collector: C. Ruiz. Martinique , “Grotte Zeb” ( 14°27.832’N , 61°01.065’W ), 19 m depth , on a vertical wall in the semi-dark part of the cave, date 16/05/2015 , sample code: 150516 MT4 -CR17, collector: C. Ruiz. Bequia , The Grenadines , “Full Moon Cave” ( 12°59.525’ N , 61°16.731’ W ), 10-12 m depth , beneath an overhang, date 28/04/2015 , sample code: 150428LG1-AE55, collector: A. Ereskovsky. Bequia , The Grenadines , “Full Moon Cave” ( 12°59.525’ N , 61°16.731’ W ), 10-12 m depth , beneath an overhang, date 19/05/2015 , sample code: 150519LG1-TP5, collector: T . Pérez . Guadeloupe , “Grotte Cathédrale” ( 16°27.740’ N , 61°31.837’ W ), 18 m depth , on a vertical wall in the dark part of the cave, date 29/05/2015 , sample code: 150529GU3-TP2, collector: T . Pérez . Guadeloupe , “Grotte aux Barracudas” ( 16°27.301’ N , 61°32.253’ W ), 19 m depth , beneath an overhang, date 30/05/2015 , sample code: 150530GU5-CR4, collector: C. Ruiz. Guadeloupe , “Grotte aux Barracudas” ( 16°27.301’ N , 61°32.253’ W ), 19 m depth , beneath an overhang, date 30/05/2015 , sample code: 150530GU5-CR10, collector: C. Ruiz. Comparative material examined: Oscarella filipoi , Martinique , Anse d’Arlet , Grande Anse , Pointe Burgos - Grotte Couleur ( 14°2.787’N , 61°5.351’W ), 10 m depth , on a vertical wall in semi-dark conditions, date 11/06/2011 , sample code: 110611 MT3 -TP05, collector: T . Pérez . Oscarella zoranja , “ Grotte Zeb” ( 14°27.832’N , 61°01.065’W ), 19 m depth , on a vertical wall in the semi-dark part of the cave, date 13/06/2011 , sample code: 110613 MT4 -TP1, collector: T . Pérez