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A new species of Dalmatinella Radoman, 1973 (Caenogastropoda: Hydrobiidae) from Croatia
Beran, L., Rysiewska, A., Hofman, S., Osikowski, A. & Falniowski, A.
A new species of Dalmatinella Radoman, 1973 from Croatia, found at three localities: Donja Rošca and Trnbusi at Cetina River and Ploče, Baćina lakes (type locality), is described. The shell, female reproductive organs and penis are described and illustrated. New species is compared with the type species of Dalmatinella: D. fluviatilis Radoman, 1973, from its type locality: Jankovića Buk, waterfalls, the Zrmanja River, Croatia. The new species is characterised by somewhat different habitus of the penis, and by the shell with higher spire and aperture. The differences are confirmed by the principal component analysis (PCA). Mitochondrial cytochrome oxidase subunit I (COI) confirmed species distinctness of the new species (p-distance 0.039).
Key words: Gastropod, taxonomy, reproductive organs, shell biometry, PCA, mtDNA, cytochrome oxidase, Balkans
Rahula revisited (Pulmonata: Euconulidae), with data for Bhutan, India (Assam), Laos, Vietnam and Indonesia, including two new species
Gittenberger, E., Leda, P., Sherub, S. & Gyeltshen, C.
New data for Rahula species in Bhutan are given, including a new species and an extended description of R. trongsaensis based on a newly found fully grown shell. The genus is known from only the eastern half of the country. Two hitherto overlooked nominal taxa of Kaliella from Assam are regarded as Rahula species resembling R. trongsaensis; photographs of syntypes of these taxa are presented. Additions to the species list for Rahula that was published earlier are added, including a new species for Indonesia, Sulawesi. An updated distribution map for the genus is provided.
Key words: Euconulidae, Rahula, taxonomy, new species, Bhutan, Asia, distribution.
New and little-known Clausiliidae of continental southeast Asia (Gastropoda: Pulmonata)
Grego, J., Hunyadi, A. & Szekeres, M.
Recent field trips yielded valuable new information on the Clausiliidae of some little-researched regions of Myanmar, Thailand and central Vietnam. Indonenia admirabilis Grego & Szekeres sp. nov., Margaritiphaedusa grata Hunyadi & Szekeres sp. nov. and Phaedusa kazueae Hunyadi & Szekeres sp. nov. are introduced as new taxa, and occurrence records are provided for some species that were described with only vaguely defined locality data. The presence of Phaedusa lypra (Mabille, 1887) in Myanmar and Thailand is reported and the taxonomic status of Phaedusa lucens Loosjes, 1953 is discussed.
Key words: Garnieriinae, Phaedusinae, new taxa, Southeast Asia, zoogeography.
Stenoplax iansa sp. nov. from Brazil (Polyplacophora, Chitonoidea)
Jardim, J. A. & Almeida, S. M.
Stenoplax iansa sp. nov. is described from the coastal waters of Brazil based on morphology. The morphological distinctions along the species ontogeny are addressed and comparisons with other local congeners are provided.
Key words: Stenoplax iansa nov. sp., Ischnochitonidae, Brazil, Polyplacophora.
Plagigeyeria montenegrina Bole, 1961 (Caenogastropoda: Truncatelloidea: Moitessieriidae): morphology and molecules in the species and genus taxonomy
Rysiewska, A., Osikowski, A., Pešić, V., Grego, J., Falniowski, A. & Hofman, S.
The shell habitus, teleoconch and protoconch SEM studied surface, radula, female reproductive organs and penis are described and illustrated for Plagigeyeria montenegrina Bole, 1961 from its type locality: Obodska Pećina Cave near Rijeka Crnojevića (Montenegro). The DNA sequences of the mitochondrial cytochrome oxidase subunit I (COI), nuclear histone H3 and ribosomal 18S and 28S genes have been used to infer phylogenetic position of P. montenegrina, which should belong to the genus Paladilhiopsis Pavlovic´, 1913. The anatomical and shell data strongly suggest that the genus Plagigeyeria Tomlin, 1930, as well as Saxurinator Schütt, 1960 are not distinct, but their status remains open, since type species have not been examined. The discovery of the shells of Plagigeyeria spp. at three interstitial habitats contradicts the common believe in isolation of stygobiotic inhabitants of caves and springs, supposed to be the main factor causing rapid speciation at (nearly) each locality. This, and the wide variability in the morphology, not only of the shell, but also of the anatomy, questions the species distinction of many nominal species described in this group.
Key words: Interstitial fauna, Mollusca, phylogeography, stygobiotic fauna.
An annotated checklist of the extant and quaternary land molluscs of the Desertas Islands, Madeiran Archipelago
Cameron, R. A. D., Teixeira, D., Pokryszko, B., Silva, I. & Groh, K.
A revised and annotated checklist of the living and Quaternary land snails of the Desertas Islands, Madeiran Archipelago, is presented, incorporating recent published work and records previously unpublished. 55 species have been recorded on the Desertas, of which 36 were alive and 41 were found as Quaternary fossils. Only four species are widespread and not endemic to the Archipelago; 14 are endemic to the Desertas. 19 species are known only as Quaternary fossils from the Desertas, of which eight remain extant elsewhere in the Archipelago. Three species, Leptaxis groviana, L. simia and Discula polymorpha, are represented on the Desertas by more than one subspecies, although this status has not been confirmed by molecular studies. Records of a further seven species appear doubtful but are listed here.
Key words: Madeiran Archipelago, Desertas Islands, land molluscs, extant, fossil.
Auris inornata, a new Bulimulidae from Espírito Santo, Brazil (Gastropoda, Pulmonata)
Simone, L. R. L. & Amaral, V. S.
Auris inornata is described based on samples from Guriri, São Mateus, Espírito Santo, Brazil. The new species is compared to its congeners, being mainly characterized by its small size and less sculptured shell. A brief discussion about all the species of the genus is also performed.
Key words: new species, Bulimulidae, Auris inornata, Restinga bioma, Pulmonata.
Two new Siphonalia (Gastropoda, Buccinidae) from Northeast Taiwan
Zhang, S., Zhang, S. & Lee, C.
Two new species belonging the genus Siphonalia Adams, 1863 are described from relatively shallow water (100-180m) off Kueishan Island, northeast Taiwan. Siphonalia minor sp. nov. is most similar to Siphonalia vanattai Pilsbry, 1905 (a species also occurring at Kueishan Island) in general shell shape, but can be distinguished from it by having a slightly broader shell, convex spire whorls, different colour pattern, and most notably, by having 6–7 widely spaced whitish spiral cords along the body whorl. Siphonalia teres sp. nov. can be clearly distinguished from other congeners by having a medium sized shell with a moderately short spire, and sculptured upper teleoconch whorls in combination with a smooth body whorl.
Key words: Lottia, lectotype, conspecific, junior synonym, Bohai Sea, phylogenetic inference.
Length–weight relationship for the freshwater mussel Unio ravoisieri (Mollusca: Bivalvia: Unionidae) from different Tunisian aquatic ecosystems
Fassatoui, C. & Romdhane, M. S.
The freshwater mussels of the Unionidae family are bivalve molluscs widely distributed across the continents of the world, with the exception of South America and Antarctica. This family forms the most diversified group of freshwater mussels at the specific level, with currently 753 identified species represented by 153 genera. In Tunisia, the diversity of unionid mussels is low, with only five species currently recognised. Among them, there is Unio ravoisieri (Deshayes, 1847) which presents the most common freshwater mussel species in North Africa. U. ravoisieri’s geographic distribution in Tunisia is limited to the humid and sub-humid bioclimatic regions and it lives in lotic and lentic ecosystems in the north.
Key words: Unionidae, Unio ravoisieri, Tunisia, freshwater mussels, length–weight.
First report of Hastula anomala (Gray, 1834) (Gastropoda: Terebridae) from Indian waters
Rout, S. S., Bhagyashree Dash, B., Adapa, B., Rao, N. V. S., Rao, K. V. S., Raman, A. & Raut, D.
Members of the gastropod family Terebridae, commonly known as auger or pencil shells are distinctively narrow, slender and multi-whorled, inhabiting specialized sand and mud shallow marine habitats. Worldwide, this family is represented by about 400 species with significant numbers from the tropical Indo Pacific region.
Key words: Gastropoda, Terebridae, Hastula anomala, India.
Recent colonisation of East Anglian estuaries by Haminoea navicula (da Costa, 1778)
Taylor, S. & Faasse, M.
Late in 2019 the first author was approached by a local ecological consultant regarding some bubble shells, tentatively identified as Bulla sp., which had been reported from a locality at Wrabness (Fig. 1), on the southern shore of the Stour estuary between Essex and Suffolk. The site being a known locality for Akera bullata Müller, 1776, a specimen was requested for determination.
Key words: Gastropoda, Haminoea navicula, East Anglia, Stour estuary.