Alvaro Alonso Suárez

Two juveniles of Solemya togata (Poli, 1791) have been found in the marina of Gijón, Asturias. As only juveniles were found it appears the species has recently settled there. It is the first record from the Cantabrian Sea in more than a century and the first record from Asturias. Possibly, this is the northern limit of its distribution area.

The first records of fhe introduced marine bivalve Theora lubrica A. Gould, 1861 from Gijón and Avilés in Asturias are presented; the first Spanish records outside the Basque Country. It is quite likely that it is currently widespread in harbours and marinas in NW Spain, but has been overlooked or misidentified as an Abra species.

A new species of freshwater snails of the genus Corrosella is described from the province of Cádiz, Andalusia (southern Spain). This is the westernmost species of the genus known so far in this region, enlarging the distribution area to more than 100 km to the west. Shell morphology, anatomy and molecular tools distinguish it safely from other spec...

A new subspecies of Tarracospeum raveni is described from the locality of Vilaverd (la Conca de Barberà, Tarragona province). The new subspecies can be distinguished from the nominate subspecies by subtle but constant differences in its shell, and also from its location in a different river basin, the Francolí River.

This paper presents an overview of all holoplanktonic gastropods thus far known from NW Spain. Shells of such molluscs are rarely beached. However, holoplanktonic gas-tropods may live close to the coast in embayments adjoining deeper water, and shells of several species have been found on beaches along such bays. Seven species are newly recorded fr...

Hydrocena canttabrica sp. nov. is described from caves in Cantabria, Spain. Unlike the two other extant European species, the Dinaric Hydrocena cattaroensis (Pfeiffer, 1841) and the Macaronesian Hydrocena gutta Shuttleworth, 1852, which are both epigean, the new species is the first cave-dwelling Hydrocenidae already known.

A new genus and a new species of valvatiform stygobiotic mollusc of the family Hydrobiidae are described for the Fluvià River basin, in Catalonia, based on morphologic traits of the shells and peculiarities of the male reproductive system.

Large specimens of Jamina quadridens (O.F. Müller, 1774) from different localities in continental Europe have been recorded as Jaminia quadridens elongata (Moquin-Tandon, 1856). Here, the status of this name is reviewed, revealing that it corresponds to a slender form of quadridens from Corsica.

New records of Jaminia quadridens are given for NW Spain, including the first for Asturias and the second for Galicia, revealing that the species is far more widely distributed in the area than it was documented thus far. Nuevas citas de Jaminia quadridens (O.F. Müller, 1774) (Gastropoda: Stylommatophora: Enidae) para el NO de España.

Based on continuous sampling, 20 species of marine molluscs (12 gastropods, 1 scaphopod and 7 bivalves) are recorded for the Cantabrian Sea, 16 being first records from Asturias and/or Cantabria, and 7 first records for the Cantabrian Sea. Widening their known distribution areas, some species may have been overlooked, while others may actually be e...

Epitonium jolyi (Monterosato, 1878) is recorded for the first time from the Cantabrian Sea, about 1000 km North from its known area. Further data have been recovered confirming the presence of Epitonium fischeri (Watson, 1897) and Epitonium vittatum (Jeffreys, 1884) in Asturias, also species hitherto only known from southern areas, but thus far the...

A new species of the genus Islamia Radoman, 1973 is described for the Valencian Community in Spain. This is the first species of this genus discovered in this territory, and it can be distinguished from other known species by the morphology of the shell. The spring where it was found has another known endemic mollusc, thus being a place of high int...

A new species of the genus Spiralix is described for the province of Castelló (Spain), which differs conchologically from other known species in this genus. This geographical area is a hotspot for this genus, given the high number of endemic taxa already described.

A new genus and a new species of the family Moitessieriidae (Mollusca: Gastropoda) are described for Spain. The main morphological characters are described, which allow for distinguishing the new genus from other known genera.

Navalis edetanus a new species of the genus Navalis Quiñonero-Salgado & Rolán, 2017 is described for the province of València (Spain). The new species can be easily differentiated by its morphology from the other single known species of the genus.

The slug Papilloderma altonagai Wiktor, Martín & Castillejo, 1990 was described from an adult from the Sanctuary of Covadonga (Asturias, Spain) and a juvenile from Puerto de Alisas (in neighbouring Cantabria), but it was never recorded again outside the first site, an anthropogenic environment. New data, based on limacellae recovered by sieving of...

New records of marine molluscs in Asturias and Cantabria are reported, some of them being also the first records for any of these autonomous communities and, in some cases, for the Cantabrian Sea. Resumen: Se dan a conocer nuevas citas de moluscos marinos de Asturias y Cantabria, varias de las cuales constituyen las primeras para esas comunidades...

The first records of naturalised populations of the bivalve Ruditapes philippinarum are presented for Asturias (NW Spain), along with evidence of hybridisation with native Ruditapes decussatus. In addition, characters are established to reliably differentiate between both species. Primeras citas de Ruditapes philippinarum (Adams & Reeve,1850) (Bi...

New records of Cernuella virgata are given for the Cantabrian corniche, discussing why in this area it is considered to be an introduced species. Resumen: Se aportan nuevas citas de Cernuella virgata en la cornisa cantábrica, y se aborda su posible carácter de especie introducida dentro de esta zona geográfica.

The family Epitoniidae Berry, 1910 is represented by seven species along the coast of Asturias and Cantabria. Epitonium pulchellum (Bivona, 1832) is recorded for the first time from the area. Observations from the field and from an aquarium are discussed, especially the feeding habits of Opalia crenata (Linnaeus,1758).

Resumen: Se aportan diversos datos sobre la biología y etología del género Testacella en Asturias, con observaciones sobre animales vivos tanto en el medio natural como en cautividad. También se incluyen nuevas citas, incluida la primera cita de T. scutulum para Asturias, ampliando los datos de distribución de las tres especies ibéricas de Testacel...

Se señala la primera población de Retinella incerta para Asturias, además de la presencia en la región de otras especies de gasterópodos terrestres ajenas a la fauna nativa de esta comunidad autónoma. // The first population of Retinella incerta is recorded for Asturias, along with the presence of other allochthonous species of terrestrial gastropo...

Within the genus Pyrenaearia P. Hesse, 1921, Pyrenaearia cantabrica (Hidalgo, 1873), from the NW Iberian Peninsula, is the species with the widest distribution and variability. Herein we discuss the taxa included within the P. cantabrica clade sensu Elejalde et al. (2009), including photographs of types and live specimens, and we identify the corre...

Spiralix tuba (Gastropoda: Moitessieriidae), a new species of the genus Spiralix, is described from the Pobla de Benifassà (Spain), which can be conchologically differentiated from the known congeneric species by a series of conchological characters.

New distribution data of Deganta azarum, with records from Asturias and Cantabria (Spain) are presented, revising its known distribution.

New distribution data of Deganta azarum, with records from Asturias and Cantabria (Spain) are presented, revising its known distribution.

New data on the distribution of Pyrenaearia cantabrica are provided, of which that from El Bierzo (Leon) stands out, far removed from its known areal.

Xerotricha corderoi is recorded for the first time from the Picos de Europa and Plentuisa vendia from further west in the Cantabrian Mountains than its known areal, making the areals of both species overlap.

For several continental molluscs the first records for Cantabria (Spain) are presented. In addition, some distribution data recently presented in "Guia de moluscos y caracoles de la Peninsula Iberica" (Cadevall & Orozco, 2016) are corrected.

The families Truncatellidae Gray, 1840 and Ellobiidae L. Pfeiffer, 1854, typical for coastal inlets and marshes, are revised for the northwest coast of Spain, clarifying some bibliographical data and presenting new records for some species. Among the most significant, the first records of Ovatella aequalis (Lowe, 1832) from the Cantabrian Sea are p...

It is described a teratological specimen of Pachygrapsus marmoratus (Fabricius, 1787) found in Avilés (Asturias, Spain), featuring a bifurcated articulated finger on the right cheliped.

A new species of the family Moitessieriidae Bourguignat, 1863 is described from Asturias (north of Spain), belonging to the genus Spiralix Boeters, 1972, and included in the subgenus Burgosia Boeters, 2003. It is the second species known in the area. It differs from other species by its conchological characteristics, including teleoconch and protoc...

Two new species of the genus Islamia are described from the autonomous communities of Cantabria and Asturias (north of Spain). This genus is currently represented in the Iberian Peninsula and the Balearic Islands by eight species and subspecies. The new species are compared with other congeneric species from which they differ in conchological chara...

Brief divulgative article on subterranean snails from Asturias (Spain), including the recent description of Zospeum percostulatum

Zospeum percostulatum sp. n. from Cueva de La Herrería (Llanes, Asturias) is described. It is characterized by a relatively large shell (1.4–1.8 mm height), conical, with ovate aperture, continuous peristome and thickened parietal callus; shell costulate except two first whorls; without any sort of inner formations. It is the first clearly costulat...

A new especies of a genus of minute snails living only in caves -Zospeum percostulatum sp. n.- is described from Asturias (Spain), being the first species of the genus described for this autonomous community.

Se dan a conocer nuevos datos de distribución de dos especies de gasterópodos terrestres: Xerotricha cor-deroi, que se cita por primera vez para Asturias, y Plentuisa vendia, que se cita por primera vez en León.