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WOS: 000392316000003, This contribution forms part of a series of collective articles published regularly in Mediterranean Marine Science that report on new biodiversity records from the Mediterranean basin. The current article presents 51 geographically distinct records for 21 taxa belonging to 6 Phyla, extending from the western Mediterranean to the Levantine. The new records, per country, are as follows: Spain: the cryptogenic calcareous sponge Paraleucilla magna is reported from a new location in the Alicante region. Algeria: the rare Atlanto-Mediterranean bivalve Cardium indicum is reported from Annaba. Tunisia: new distribution records for the Indo-Pacific lionfish Pterois miles from Zembra Island and Cape Bon. Italy: the ark clam Anadara transversa is reported from mussel cultures in the Gulf of Naples, while the amphipod Caprella scaura and the isopods Paracerceis sculpta and Paranthura japonica are reported as associated to the -also allochthonous- bryozoan Amathia verticillata in the Adriatic Sea; in the latter region, the cosmopolitan Atlantic tripletail Lobotes surinamensis is also reported, a rare finding for the Mediterranean. Slovenia: a new record of the non-indigenous nudibranch Polycera hedgpethi in the Adriatic. Greece: several new reports of the introduced scleractinian Oculina patagonica, the fangtooth moray Enchelycore anatina, the blunthead puffer Sphoeroides pachygaster (all Atlantic), and the lionfish Pterois miles (Indo-Pacific) suggest their ongoing establishment in the Aegean Sea; the deepest bathymetric record of the invasive alga Caulerpa cylindracea in the Mediterranean Sea is also registered in the Kyklades, at depths exceeding 70 m. Turkey: new distribution records for two non-indigenous crustaceans, the blue crab Callinectes sapidus (Atlantic origin) and the moon crab Matuta victor (Indo-Pacific origin) from the Bay of Izmir and Antalya, respectively; in the latter region, the Red Sea goatfish Parupeneus forsskali, is also reported. Lebanon: an array of records of 5 alien and one native Mediterranean species is reported by citizen-scientists; the Pacific jellyfish Phyllorhiza punctata and the Indo-Pacific teleosteans Tylerius spinosissimus, Ostracion cubicus, and Lutjanus argentimaculatus are reported from the Lebanese coast, the latter notably being the second record for the species in the Mediterranean Sea since 1977; the native sand snake-eel Ophisurus serpens, rare in the eastern Mediterranean, is reported for the first time from Lebanon, this being its easternmost distribution range; finally, a substantial number of sightings of the lionfish Pterois miles further confirm the current establishment of this lessepsian species in the Levantine., COST (European Cooperation in Science and Technology) Action TD1209 Alien Challenge project; East and South European Network for Invasive Alien Species - a tool to support the management of alien species in Bulgaria (ESENIAS-TOOLS) (EEA) project [33-51/30.06.2015]; EEA GRANTS; Public Investments Programme (PIP) of the Hellenic Republic; Cretaquarium, Nadhera Babali would like to thank Mr Nabil Hadjadji and Mr Mhamed Laid for taking pictures of the specimen of Cardium indicum during collection, which helped with identification of the collection date and site, as well as Mr Samuel Iglesias for valuable guidance. Gianna Servello and Fabio Crocetta acknowledge the study of the alien species recorded in the Italian Seas that was partially funded by the COST (European Cooperation in Science and Technology) Action TD1209 Alien Challenge (GS) and the East and South European Network for Invasive Alien Species - a tool to support the management of alien species in Bulgaria (ESENIAS-TOOLS) (EEA funded: Contract No. -33-51/30.06.2015) (FC) projects. Francesco Tiralongo is grateful to the fishermen of the vessel "Oreste" (3288) who caught the specimen of Lobotes surinamensis, for providing the information and the picture. The reports of Caulerpa cylindracea, Oculina patagonica, and Enchelycore anatina were conducted along a survey in the Aegean Sea within the framework of the MARISCA project, co-funded (85%) by EEA GRANTS, 2009-2014, and the Public Investments Programme (PIP) of the Hellenic Republic (15%). Thomas Hasiotis and Stelios Katsanevakis thank Kostas Tsiamis for his comments on an earlier draft of their manuscript. Michail Ragkousis and Vasilis Gerovasileiou are thankful to Nina Premezzi and Ioannis Havakis who provided information and photos about the later record of E. anatina. Aspasia Sterioti sincerely thanks Cretaquarium for support and funding, G. Vardanis for the transportation and photo of the species and C.K. Doxa for the photo of the species. Fabio Crocetta and Michel Bariche acknowledge Messrs T. Assal, M. Ali Ibrahim, J. Bacha, J. Bahout, V. Bayrakdarian, D. Captan, K. Greig, M. Hado, M. Hayek, J.-P. Massoud K. Merhabi, W. Nini, H. Rifai, N. Saidi, E. Saliba, I. Sidawi, N. Weber, and several other fishermen and scuba divers who kindly provided records, photographs and videos of the reported animals from Lebanon. Finally, thanks are due to all anonymous reviewers for critical reading and providing helpful and constructive comments on the included articles.

The fangtooth moray, Enchelycore anatina (Lowe, 1838), native to the eastern Atlantic Ocean but also known from eastern sections of the Mediterranean, is recorded for the fi rst time from Maltese coastal waters in the central Mediterranean. This record is the westernmost one within the Mediterranean and the observed E. anatina individual co-occurred with an individual of Muraena helena Linnaeus, 1758., peer-reviewed

The Collective Article 'New Mediterranean Biodiversity Records' of the Mediterranean Marine Science journal offers the means to publish biodiversity records in the Mediterranean Sea. The current article is divided in two parts, for records of alien and native species respectively. The new records of alien species include: the red alga Asparagopsis taxiformis (Crete and Lakonikos Gulf, Greece); the red alga Grateloupia turuturu (along the Israeli Mediterranean shore); the mantis shrimp Clorida albolitura (Gulf of Antalya, Turkey); the mud crab Dyspanopeus sayi (Mar Piccolo of Taranto, Ionian Sea); the blue crab Callinectes sapidus (Chios Island, Greece); the isopod Paracerceis sculpta (northern Aegean Sea, Greece); the sea urchin Diadema setosum (Gökova Bay, Turkey); the molluscs Smaragdia souverbiana, Murex forskoehlii, Fusinus verrucosus, Circenita callipyga, and Aplysia dactylomela (Syria); the cephalaspidean mollusc Haminoea cyanomarginata (Baia di Puolo, Massa Lubrense, Campania, southern Italy); the topmouth gudgeon Pseudorasbora parva (Civitavecchia, Tyrrhenian Sea); the fangtooth moray Enchelycore anatina (Plemmirio marine reserve, Sicily); the silver-cheeked toadfish Lagocephalus sceleratus (Saros Bay, Turkey; and Ibiza channel, Spain); the Indo-Pacific ascidian Herdmania momus in Kastelorizo Island (Greece); and the foraminiferal Clavulina multicamerata (Saronikos Gulf, Greece). The record of L. sceleratus in Spain consists the deepest (350-400m depth) record of the species in the Mediterranean Sea. The new records of native species include: first record of the ctenophore Cestum veneris in Turkish marine waters; the presence of Holothuria tubulosa and Holothuria polii in the Bay of Igoumenitsa (Greece); the first recorded sighting of the bull ray Pteromylaeus bovinus in Maltese waters; and a new record of the fish Lobotes surinamensis from Maliakos Gulf., peer-reviewed

According to reports, the following 16 species have extended their distribution to other Mediterranean areas or have made a new appearance in other regions. The first category includes the following organisms: The rare and common Indo-Pacific seaweed Codium arabicum (Lebanese coasts), the acari Thalassarachna affinis (Marmara Sea), and the non-indigenous nudibranch Flabellina rubrolineata , which has also been found in many other areas of the Aegean Sea. In addition, the rare sea slug Thecacera pennigera (Piccolo of Taranto), the fangtooth moray Enchelycore anatina (National Marine Park of Zakynthos, Ionian Sea), the carangid Seriola fasciata (Gulf of Antalya), Lagocephalus sceleratus (SE. Ionian Sea), the reticulated leatherjacket Stephanolepis diaspro s (Slovenia, N. Adriatic Sea), the marbled stingray, Dasyatis marmorata (NE Levantine), the starry smooth-hound Mustelus asterias (Iskenderun Bay, NE Mediterranean), the cephalopod Ommastrephes bartramii (Ionian Sea) have also been reported. The Atlantic crab Dyspanopeus sayi has expanded to many Italian areas and the blue crab Callinectes sapidus to a lake in N. Greece and in the S. Adriatic Sea. Finally, Farfantepenaeus aztecus has been found in the Ionian Sea, thus showing its wide expansion in the Mediterranean. The larval stages of Faccionella oxyrhyncha have been found, after many years, in the Aegean Sea and the first report of an existence on intersexual acari Litarachna duboscqi in Split (Adriatic Sea) was reported.

The collection of one specimen of the non-indigenous fangtooth moray Enchelycore anatina of tropical Atlantic origin was for the first time found in an area of south eastern Aegean Sea. This record may indicate a recent establishment of the species on the coasts of Rhodes Island and a possible expansion of it on the coastal rocky habitats.