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This article includes 23 new records of alien and cryptogenic species in the Mediterranean Sea, belonging to 4 Phyla (Chordata, Echinodermata, Arthropoda and Mollusca), distributed from the Alboran to the Levantine Sea. Records are reported from eight countries listed from West to East as follows: Algeria: new records of the Atlantic blue crab Callinectes sapidus; Spain: further spread and establishment of the sea slug Lamprohaminoea ovalis in continental shores; Tunisia: first record of the Atlantic Blue Crab Callinectes sapidus in the Gulf of Gabes; Italy: a new occurrence of the pufferfish Lagocephalus sceleratus in Northern Ionian waters; first record of Cephalopholis taeniops in the Ionian Sea; first record of the redlip blenny, Ophioblennius atlanticus in the Ionian Sea; Slovenia: first record of the isopod Paranthura japonica in Slovenia; Greece: first record of the molluscs Eunaticina papilla, Plocamopherus ocellatus and the fish Cheilodipterus novemstriatus; first record of the ascidian Ecteinascidia turbinata in Kriti; the long-spined sea urchin Diadema setosum in the Ionian Sea; Turkey: first record of the sea spider Ammothea hilgendorfi; the stomatopod Cloridina cf. ichneumon; the fishes Pempheris rhomboidea from the Sea of Marmara and Paranthias furcifer from the Aegean Sea; Lebanon: new records of the fishes Arothron hispidus, Rachycentron canadum, Heniochus intermedius and Acanthurus monroviae; first record of Acanthostracion polygonius. The records of Cloridina cf. ichneumon from southern Turkey and the fish Acanthostracion polygonius from Lebanon, both being the first Mediterranean records, are noteworthy.

This is the second collective paper issued in 2019, currently amalgamates new knowledge on the Mediterranean geographic distributions of 17 species from five phyla (six aliens, three cosmopolitans, two east Atlantic records and six natives). The acknowledged species were reported from ten countries, mentioned here from west to east: Spain: first report of the east Atlantic grouper Cephalopholis taeniops in the western Mediterranean and an inclusion of Pontarachna puntulum and Litarachna communis to the pontarachnid fauna of Spain; Morocco: first record of Solea senegalensis from the Moroccan Mediterranean coast; Algeria: a valid confirmation for the presence of Sardinella maderensis; Malta: a first record of the Red Sea stomatopod Erugosquilla massavensis; Italy: a rare observation of the crab Paragalene longicrura from Siciliy and a further integration of the alien brown shrimp Penaeus aztecus to the commercial catch in Sicily; Montenegro: a first record of the Lessepsian bigfin reef squid Sepioteuthis lessoniana from the Adriatic Sea; Turkey: northernmost documentation of the Mediterranean flatworm Prostheceraeus giesbrechtii in the Aegean Sea; Israel: a solid confirmation for the population establishment of both the alien rock shrimp Sicyonia lancifer and two species of angelfish, and a first and deepest record of the crystalline goby Odondebuenia balearica; Lebanon: first record of the jellyfish Pelagia noctiluca; Syria: first records of the crown jellyfish Nausithoe punctate and the smallscale codlet Bregmaceros nectabanus.

WOS: 000504749700017, This paper is a collection of novel distributional records of 20 species belonging to 8 phyla (Chlorophyta, Rhodophyta, Cnidaria, Ctenophora, Annelida, Mollusca, Arthropoda and Chordata) from 11 Mediterranean countries, namely, Spain: an additional record of the Canary dentex Dentex canariensis is reported from Spain (Valencia), this is the northernmost record of this species in the Mediterranean; Algeria: the first documented record of Caulerpa chemnitzia is reported from the Algerian coast; France: the first record of the Spotted sea hare Aplysia dactylomela is reported from the eastern coast of Corsica; Italy: the first records of the Lessepsian polychaete Dorvillea similis and the alien bivalve Isognomon legumen are reported from Italian waters while additional records of Mnemiopsis leidyi in the south Adriatic are provided; Libya: the first record of an alien mollusc Crepidula fornicata is reported from Libyan waters; Malta: multiple sightings of gelatinous species Apolemia uvaria, Phacellophora camtschatica and Physophora hydrostatica are reported for the first time from Maltese waters, as well as the first tentative record of the Orange-spotted grouper Epinephelus cfr. coioides; Greece: an occurrence of a rare Bigeye thresher shark Alopias superciliosus is reported from Hellenic Ionian waters, while the first records of the alien Mertens' prawn-goby Vanderhorstia mertensi, the recently described cyclopoid copepod Oithona davisae and the alien red seaweed Asparagopsis armata are reported from the Aegean Sea. The presence of the micromollusc Euthymella colzumensis is confirmed for Greece; Cyprus: the first record of the red cornetfish Fistularia petimba is reported from Cyprus; Turkey: the first record of the alien jellyfish Marivagia stellata is reported from south-eastern Turkey; Israel: the first records of the sea nettle Chrysaora sp. in the Levant are reported., International Ocean Institute (IOI); Croatian Science Foundation (HRZZ) [IP-2016-06-5251]; Regione Autonoma Friuli Venezia Giulia; Israel Society of Ecology and Environmental Sciences; GoJelly project-EU Horizon 2020 [774499], Langeneck J. and Tempesti J. are grateful to M. El-Metwally and J. Ferrario for providing Red Sea specimens of D. similis, and to M. Lezzi for his support in the preparation of permanent slides. Deidun A. and Piraino S. wish to thank Mr. Pete Bullen (www.oceanfoto.co.uk), Roy Davidson, Hans Messler, Alexander Ferrante and Lyndsey Bee for making their photographs of the three gelatinous species in caption available to the authors, as well as to the International Ocean Institute (IOI) for sponsoring the Spot the Jellyfish campaign since 2010. Thanks are also due to Andre C. Morandini (Brasil) for supporting advice on P. camtschatica identification. Deidun A. and Zava B. are indebted to the angler Romario Pace for donating the photo of the fish individual reported hereunder. Dragicevic B. and Dulcic J. are thankful to Mr. Nikola Cvitan who provided photographs and videos of the specimen as well as additional information. Their work was partly supported by the Croatian Science Foundation (HRZZ) under project IP-2016-06-5251. Tirelli V. and Goruppi A. wish to thank the citizen scientists for providing sightings and photographic material through avvistAPP (Michele Cravati, V. D., Vincenzo Frezza, S. I., R. M., S. M., I. T. and C. V.) and the Regione Autonoma Friuli Venezia Giulia for funding the NOCE di MARE project. Michailidis N. and Manitaras I. thank fishmonger George Karamanos and fisher Christos Efrem for providing the specimen and information on its catch. Edelist D., Kuplik Z., Guy-Haim T. and Angel D. thank Dror Gilat and Inbar Margulis for recording and sharing their observations, and Mark J Gibbons, Andre C Morandini and Stefano Piraino for their useful taxonomic contributions. "Medusot Baam" is funded by the Israel Society of Ecology and Environmental Sciences, as well as the GoJelly project -EU Horizon 2020 grant No 774499.

The data obtained from the 2016 Deep-Sea Lebanon Expedition provided a wealth of information about deep-sea benthic communities along the Lebanese coast. This information provides a scientific foundation for the development of a plan to manage and protect vulnerable ecosystems, habitats, and species in Lebanese waters, in the face of current and future threats. This plan should be developed in line with the relevant Action Plans developed by UNEP-MAP RAC/SPA, with measures being developed to protect VMEs within GFCM fisheries, and with Lebanon’s legal obligations to protect species listed on Annex II of the SPA/BD Protocol of the Barcelona Convention. One critical element of this plan will be the declaration of new MPAs under the framework of a Lebanese network of MPAs. These areas may be designated to protect important geological features (e.g., submarine canyons), habitats, or community types, in order to ensure the coherence and connectivity of marine protection in Lebanese waters, and to help safeguard the natural corridor of the Eastern Mediterranean basin.

Dark habitats are environments where the luminosity is extremely weak, or even absent (aphotic area) leading to an absence of macroscopic autochthonous photosynthesis. The bathymetric extension of this lightless area depends to a great extent on the turbidity of the water and corresponds to benthic and pelagic habitats starting from the deep circa-littoral. Caves which show environmental conditions that favour the installation on of organisms characteristic of dark habitats, are also taken into account. Dark habitats are dependent on very diverse geomorphological structures (e.g. underwater caves, canyons, slopes, isolated rocks, abyssal plains, cold seeps, brine anoxic lakes, hydrothermal springs and seamounts). Dark habitats represent outstanding and potential ecosystems with regard to their: Frailty and vulnerability to any land-based pressure Play an important part in the way the Mediterranean ecosystem functions, insofar as they constitute the main route for transferring matter between the coast and the deep sea Considered as biodiversity hotspots and recruiting areas forming a veritable reservoirs of knowledge and biodiversity Natural habitats that come under Habitat Directive on the conservation of natural habitats and of wild fauna and flora and appear as such as priority habitats requiring protection (Directive 92/43). A certain number of underwater caves enjoy protection status because they fall within the geographical boundaries of Marine Protected Areas (MPAs) Understanding of these functions is necessary for a better understanding and management of the biodiversity of Mediterranean coastal zones and continental shelf., peer-reviewed