Gastrotricha Mečnikow, 1865 compose a cosmopolitan phylum of aquatic and semi-aquatic invertebrates comprising over 850 described species, that are known to inhabit various aquatic ecosystems from all over the world where they often show high density and diversity. Up to now Gastrotricha have been studied in artificial habitats, such as greenhouses only in the Poznań Palm House (Poland). In May 2013 a preliminary study was conducted in the Copenhagen Palm House (Denmark) to provide additional evidence of the presence of gastrotrichs in anthropogenic water bodies in greenhouses. Five species were found: Ichthydium podura Müller, 1773, Lepidodermella intermedia Kånneby, Todaro & Jondelius, 2012, Chaetonotus (Hystricochaetonotus) macrochaetus Zelinka, 1889, Chaetonotus (Hystricochaetonotus) sp., and Chaetonotus (Chaetonotus) sp. Lepidodermella intermedia is new to Danish fauna and constitutes the second record of this species. Detailed taxonomic and morphological remarks are provided for this newly recorded species.

Gastrotricha Metschnikoff, 1865 is a small phylum of acoelomatic animals common in both marine and freshwater environments. To date, close to 800 species are known from all over the world. The order Macrodasyida Remane, 1925 [Rao & Clausen, 1970] is almost exclusively marine except for the rare genera Marinellina Ruttner-Kolisko, 1955 and Redudasys Kisielewski, 1987. In this study, we present morphological and molecular data for a potentially new species of Redudasys from the Edwards Aquifer, Texas, USA. It is the first record of the genus from the Northern hemisphere. It has only previously been reported from Brazil. The Texan specimen, designated as Redudasys sp., has a single pair of anterior adhesive tubes and is considerably shorter than the specimens reported from Brazil. Molecular data from the 18S rRNA and COI mtDNA genes support a close relationship of Redudasys sp. to Redudasys fornerise Kisielewski, 1987. Barcodes are provided for both Redudasys sp. and R. fornerise. The limited material obtained does not justify the description of a new species, but the record is certainly important from a biogeographical standpoint. The colonization and invasion of marine species into freshwater habitats, in particular those of the Edwards Aquifer, is discussed. Although certain marine gastrotrichs appear to have an astonishing ability to adapt to changes in salinity Redudasys is likely to be a marine relic.

Based on bibliographic data, material from coll. E. Angelier and own field work of the author done in the late 20^th century, a survey is given on the diversity and distribution of spring- and stream-dwelling water mites of the genus Atractides Koch, 1837 on Corsica and Sardinia. Published information on presence of Atractides in the area covered was restricted to Corsica (Angelier 1954a, b; Santucci 1965, 1971, 1977; Giudicelli 1970; Gerecke & Di Sabatino 2013). Redescriptions are given of the incompletely documented species Atractides gracilipes (E. Angelier, 1951) (no more documented by type material) and A. corsicus E. Angelier, 1954 (of which six syntypes could be detected in NHMB). Published records (in brackets) are referred to the species A. robustus (Sokolow, 1940) and A. acutirostris Motaş & Angelier, 1928. In total, 24 Atractides species are now known from the two islands, 50% of them recorded here for the first time: Atractides allgaier Gerecke, 2003, A. clavipes Lundblad, 1954, A. fonticolus (K. Viets, 1950), A. graecus K. Viets, 1950, A. inflatus (Walter, 1925), A. loricatus Piersing, 1898, A. macrolaminatus Láska, 1956, A. orghidani Motaş & Tanasachi, 1960, A. polyporus (K. Viets, 1922), A. protendens K.O.Viets, 1955, A. spinipes Koch, 1837, A. valencianus K. Viets, 1930. Of the 20 species known from Corsica, nine are first records — from Sardinia all 19 Atractides species are recorded for the first time. Concerning the national faunas, six species are new for Italy (A. allgaier, A. corsicus, A. giustinii Gerecke & Di Sabatino, 2013, A. gracilipes, A. orghidani, A. valencianus), three for France (A. graecus, A. macrolaminatus, A. protendens).

For the first time a list of Issini Spinola, 1839 taxa known from whole Indochinese region is given. The list comprises 12 genera with 20 species, including Tapirissus guilberti n. gen., n. sp. described from Laos. Lectotype is designated for Tetrica viridimixta Distant, 1906. Eusudasina nantouensis Yang, 1994 is recorded from Laos for the first time and Eupilis albilineola Walker, 1857 from Malaysia.

In this first work on the oribatid mite fauna of Hòn Chông limestone hills, Vietnam, we describe Bedoslohmannia anneae n. gen., n. sp. and Paulianacarus Vietnamese n. sp., in both cases studied with optical microscopy. Bedoslohmannia n. gen. presents a very interesting “leg-folding process”, unusually shaped legs and significant notogastral neotrichy. Paulianacarus Balogh, 1960 is newly reported from Vietnam and P. Vietnamese n. sp. is most similar to P. rugulosus Mahunka, 1995 from Thailand.

This publication is the third in a series of accounts on large collections of Plumularioidea McCrady, 1859 (Cnidaria, Hydrozoa, Hydroidolina) obtained during several French expeditions to the Philippines region, Vanuatu, New Caledonia, Fiji, and the Marquesas Islands. Additional material from Mozambique was also examined and is discussed. A total of 17 species, belonging to the families Kirchenpaueriidae Stechow, 1921 (two species) and Plumulariidae McCrady, 1859 (15 species), are scrutinized and illustrated in the present report. Three new species of the genus Plumularia Lamarck, 1816 are described (Plumularia bathyale n. sp., Plumularia contraria n. sp., Plumularia pseudocontraria n. sp.). The name Plumularia milsteinae n. nom., is proposed for Plumularia spiralis Milstein 1976, a permanently invalid junior homonym of Plumularia spiralis Billard, 1911. Polyplumaria kossowskae (Billard, 1911) is recorded for the first time since its original description. Two species of Plumularia are identified only to the genus level. Type materials of Plumularia habereri Stechow, 1909 and Dentitheca hertwigi Stechow, 1909, and the syntypes of all varieties of Plumularia habereri described by Billard (1913), have also been examined.

Nine new species of Muricidae from Guadeloupe, mainly collected during the 2012 KARUBENTHOS expedition, are described. Typhinellus lamyi n. sp. is compared with the similar species T. labiatus (Cristofori & Jan, 1832) from the Mediterranean Sea and T. occlusus (Garrard, 1963) from the Philippines. Dermomurex (Trialatella) pruvosti n. sp., D. (T.) boucheti n. sp., D. (T.) fajouensis n. sp. and D. (T.) tararensis n. sp. are compared with D. abyssicola (Crosse, 1865) occurring in the same area and with D. (T.) oxum Petuch, 1979 which ranges from Panama to Brazil. Pygmaepterys pointieri n. sp. and P. karukerensis n. sp. are compared with P. germainae Vokes & D'Attilio, 1980 and P. aliceae (Petuch, 1987). Muricopsis guadalupensis n. sp. is compared with M. caribbaea (Bartsch & Rehder, 1939) occurring throughout the Tropical West Atlantic and to M. marcusi Vokes, 1994 from Brazil. Lindapterys domlamyi n. sp. is compared with L. sanderi Petuch, 1987 from Barbados and Brazil and to the type species of the genus, L. vokesae Petuch, 1987 from the Early Miocene of Florida (USA). The name Murex hexagonus Lamarck, 1816, usually considered to be a primary homonym of Murex hexagonus (Gmelin, 1791), is rehabilitated (article 23.9.5, ICZN 1999). A lectotype of this species, is designated from the two syntypes housed in the MNHNG. Murex hexagonus is compared with other related Murexsul from the Caribbean area including M. oxytatus (Smith, 1938), M. zylmanae (Petuch, 1993), M. huberti (Radwin & D'Attilio, 1976), M. chesleri Houart, 2006, M. sunderlandi (Petuch, 1987), M. warreni (Petuch, 1993) and M. jahami Merle & Garrigues, 2011.