ISSN 2755-3531
A new Stephacharopa (Gastropoda: Punctoidea: Charopidae) from Paposo, northern Chile
Juan Francisco Araya & Sergio Eduardo Miquel
Abstract. Stephacharopa paposensis n.sp. is described from shells collected in coastal areas of Paposo, Región de Antofagasta, northern Chile, associated with native bromeliads and cacti living among rocks and coarse sand. This is the second species of Stephacharopa found in northern Chile and one of the northernmost species of Charopidae found in this country.
Key words. Atacama Desert, Peru, micro molluscs
New taxon. Stephacharopa paposensis Araya & Miquel, 2018
Date of publication. October 2018
Sara Castillo & Fran Ramil
Abstract. Cuspidaria voncoseli new species, is described from Northern Mauritanian deep waters at a depth of 1588–1618 m in soft bottoms. This new species is characterized by a white smooth shell with a globose disc well-separated from the rostrum, two pairs of lateral septal muscles and frilled tentacles. In addition, we describe a tentative new species but because of the lack of material have not named it.
Key words. Bivalvia, Cuspidaria, Mauritania, bathyal zone, carnivorous molluscs, new species, anatomy
New taxon. Cuspidaria voncoseli Castillo & Ramil, 2018
Date of publication. October 2018
A Campylaea species from Corsica (Gastropoda: Pulmonata: Helicidae)
Giuseppe Manganelli, Andrea Benocci & Folco Giusti
Abstract. A species of the ariantine helicid genus Campylaea is first reported from Corsica. Shell and anatomical features of the Corsican specimens, particularly the structure of the penial papilla, match those of C. planospira (Lamarck, 1822) and the shell size and thick hairy periostracum are in line with those of specimens from the southern coasts of Tuscany (Monte Argentario and Cosa promontory) and the southern Tuscan Archipelago (Giglio and Giannutri islands) assigned to C. planospira occultata (Paulucci, 1886). Although autonomous arrival in Corsica cannot be excluded a priori it is probable that the species, only recorded from a single site, was introduced into Corsica, presumably in Roman times.
Key words. Land snails, taxonomy, biogeography
Date of publication. October 2018
Life cycle and growth of Bulgarica cana (Held, 1836) under laboratory and natural conditions
Magdalena Marzec
Abstract. Members of the family Clausiliidae have relatively uniform shell structure, but are highly diverse in terms of life strategies. However, the life cycles of the majority of clausiliids are still unknown. One of the poorly known species is Bulgarica cana (Held, 1836), a species listed on the national Red Lists in 10 European countries.
The life cycle of B. cana was studied on laboratory cultures between the years 2004 and 2010. The growth of this species was observed under laboratory and natural conditions. Under laboratory conditions, the hatching success was 86.3%. The eggs of B. cana are resistant to short periods of adverse environmental conditions, i.e. drying out or flooding.
The species is oviparous. Its eggs are oval in shape, less often spherical, their size depends on the parent’s size; the mean number of eggs per batch is 8.4 (SD = 3.97). Mean incubation time at room temperature is 16.2 days (SD = 3.09).
Individuals that completed shell building were considered adults, while the others as juveniles. Hatchling shells have a mean of 2.63 whorls (SD = 0.32), and adult shells 12.42 whorls (SD = 0.49). In the laboratory, growth to adult size took on average 6.8 months (SD = 2.1). Mean growth rate was 1.6 whorls/month (from 0.75 to 2.67 depending on the individual). Various shell deformations were observed in 12.8% of the individuals. Juvenile mortality in the laboratory was 32.1%, adult mortality in consecutive years of life ranged from 7 to 32%. Under natural conditions, juveniles grew (built their shells) only during the four warmest months of the year, namely from June to September. Mean growth rate in summer was 0.71 whorl/month. Yearly growth rate was 0.21 whorl/month. At this rate, shell growth completion took at least 40 months (more than3 years).
Sexual maturation was delayed in relation to shell growth completion by at least 3.5 months. The longest observed reproductiveperiod in the laboratory was more than 4 years. Snail pairs produced on average 60.74 eggs per year. Bulgarica cana is a long-lived species; its maximum lifespan both under laboratory and natural conditions was 9 years.
Key words. Life history, Gastropoda, doorsnails, Clausiliidae, terrestrial molluscs
Date of publication. October 2018
Luiz Ricardo L. Simone & Vanessa Simão do Amaral
Abstract. Three new species of Bulimulidae (Gastropoda, Pulmonata) are described, each one endemic to a different island off the São Paulo coast, showing a high degree of endemicity of these islands in terrestrial malacofauna. Drymaeus castilhensis occurs on Castilho Island, it is mainly characterised by the strong axial dark spots in the shell or in being totally pale beige, penis elongated, lacking any inner chambers or glands, and double ducts of albumen gland. Drymaeus micropyrus occurs on Queimada Pequena Island, it is mainly characterised by greenish-cream shell, with narrow axial spots, and single duct of albumen gland. Bulimulus sula is from Alcatrazes Island, its main features include a relatively cylindrical, featureless shell, bilobed penis and, mainly and remarkably, a genital appendix that looks like a small accessory penis. These three species are described and compared with similar species, and accounts on their biogeography.
Key words. Taxonomy, new species, Pulmonata, endemicity, isolation, land snails
New taxa. Drymaeus castilhensis Simone & Simão do Amaral, 2018; Drymaeus micropyrus Simone & Simão do Amaral, 2018; Bulimulus sula Simone & Simão do Amaral, 2018
Date of publication. October 2018
Adrian T. Sumner
Abstract. A population of the Rough Winkle, Littorina saxatilis, is described that is isolated from the sea. The site is an abandoned limestone quarry next to the sea in East Lothian, Scotland, which became flooded by the sea and later cut off from the sea again. Some seawater seeps into the site at high tide, and subsequently drains away. The winkles at this site are very small, and have different patterns of shell colour polymorphism from winkles on the nearby open shore. These differences from the nearby population on the open shore must have developed since the site was cut off from the sea between about 60 and 110 years ago. The population size is of the order of 100,000 animals.
Key words. Littorina saxatilis, polymorphism, habitat, population size, speciation
Date of publication. October 2018
Roy Anderson, Folco Giusti, Mark G. Telfer, Giuseppe Manganelli, Joanna R. Pieńkowska & Andrzej Lesick
Abstract. A single adult of an unidentified hygromiid was discovered at a brownfield site on the margins of a carpark near Tilbury, south Essex, on 3rd May 2017. This was tentatively identified from photographs as a species of Monacha, possibly M. ocellata (Roth, 1839). Later in 2017, with the more widespread appearance of adults at the locality, a more detailed study was undertaken. This established, from the dissection of genitalia in sexually mature adults, that the species was indeed Monacha ocellata, native to the south-east Mediterranean and unknown in northern Europe. Molecular analysis (nucleotide sequencing of mitochondrial COI and 16SrDNA as well as nuclear ITS2 gene fragments) showed a close relationship to GenBank sequences for Monacha ocellata originating from the Citadel of Constantinople, Istanbul.
Key words. Alien, introduction, ports, Mollusca, Hygromiidae, Monacha, ITS2, COI, 16SrDNA
Date of publication. October 2018
Diniatys callosa (Preston, 1908), new combination name for Haminoea callosa from the Andaman Islands (India) [Short Communication]
Monisha Bharate, Deepak Apte, Trond Oskars & Manuel António E. Malaquias
Date of publication. October 2018
First evidence of Arcuatula senhousia (Benson, 1842), the Asian Date Mussel in UK waters [Short Communication]
Peter Barfield, Anna Holmes, Gordon Watson & Grant Rowe
Date of publication. October 2018