ISSN 2755-3531
Marijn T. Roosen, Rodrigo B. Salvador & Abraham S. H. Breure
Abstract. The revision of the genera of Scolodontidae by our team continues, reaching its fourth instalment. In this paper, the species traditionally included in Miradiscops H.B. Baker, 1925 are discussed. Miradiscops is retained for all species with a pitted protoconch and pitted teleoconch sculpture and discoid shells with a wide umbilicus. Species with a striate teleoconch sculpture, smooth protoconch, and more lenticular shell with a narrower umbilicus are classified in Mayadiscops gen. nov. The type material of all species allocated to these two genera are figured here to assist future studies. Some species formerly assigned to Miradiscops are here reclassified into other Scolodontidae genera. The following new combinations are made: Scolodonta andivaga Pilsbry, 1932; Mayadiscops balboa (Pilsbry, 1930) comb. nov.; Tamayoa (Tamayops) bladenensis (D.S. Dourson, Caldwell & J.A. Dourson, 2018) comb. nov.; Scolodonta florezi (Weyrauch, 1967) comb. nov.; Mayadiscops hovestadti (van Leeuwen & Salvador, 2024) comb. nov.; Tamayoa (Tamayops) implicans (Guppy, 1868) comb. nov.; Mayadiscops maya (Pilsbry, 1920) comb. nov.; Mayadiscops opal (Pilsbry, 1920) comb. nov.; Mayadiscops ridiculus (Pilsbry, 1930) comb. nov. Finally, Miradiscops striatae D.S. Dourson, Caldwell & J.A. Dourson, 2018 is considered a junior synonym of Mayadiscops maya comb. nov.
Key words. Land snails, neotropics, new genus, Scolodontoidea, Stylommatophora, type specimens
Publication date. 17 July 2025
DOI. https://doi.org/10.61733/jconch/4552
Juan Francisco Araya, Cecilia Osorio, Valentina Olave, Juan Antonio Aliaga
Abstract. Petricola ramirezi Araya & Osorio, 2019, a shallow-water nestling petricolid bivalve, was originally described from specimens collected washed ashore at El Tabo, central Chile (33°27′S, 071°38′W). This species is unique from all other bivalve species in the area in nestling inside empty shells of the barnacle Balanus laevis. In this study, we present new geographic records for this species based on specimens collected at several localities in northern and central Chile. These results extend the geographical distribution of P. ramirezi by approximately 1,089 km from its only previously known locality at El Tabo northwards to Caldera (27°04′S, 070°49′W) and southwards to Lirquén (36°42′S, 072°58′W). Additionally, we present the first fossil record for P. ramirezi based on specimens collected nestling inside empty shells of B. laevis from a Pleistocene site in the El Morro area, Caldera, northern Chile. These results confirm the presence of this species along an expanded geographical distribution on the present-day Chilean coasts and reveal that P. ramirezi has been present in the northern part of the country since at least the Pleistocene. The particular and specialized lifestyle of this species, nestling inside empty barnacle shells, suggests that this strategy—providing protection from predators and from sudden environmental changes—may have contributed to the survival of this species in the area since the Pleistocene.
Key words. Range extension, barnacles, ecological niche, Chile, southeastern Pacific Ocean
Publication date. 18 August 2025
DOI. https://doi.org/10.61733/jconch/4553
Zhe-Yu Chen
Abstract. A new species, Notharinia sinensis sp. nov., is described from Guangxi, China, extending the known range of the genus. Geometric morphometric analysis distinguishes Notharinia from Arinia s. l., supporting its generic validity. Two East Asian species, Notharinia japonica (Pilsbry & Hirase, 1903) comb. nov. and N. chejuensis (Kwon & Lee, 1991) comb. nov., are reassigned to Notharinia based on morphological and geometric morphometric evidence. The study also reveals that several Bornean species traditionally placed in Arinia s. l. may be more appropriately assigned to Arinia (Leucarinia), warranting further taxonomic revision.
Key words. Micro-snails, new species, taxonomy, geometric morphometrics, Guangxi, China
Publication date. 19 September 2025
DOI. https://doi.org/10.61733/jconch/4554
Amrut Bhosale, Tejas Thackeray, Dinarzarde C. Raheem, Swapnil Pawar & Akshay Khandekar
Abstract. We describe a new species of Lagocheilus from Ratoba Point, Tilari Nagar, Kolhapur District, in the northern Western Ghats of Maharashtra, India. Lagocheilus hayaomiyazakii n. sp. can be distinguished from its South Indian and Sri Lankan congeners by a unique combination of shell characters: a conoidal shell with a raised spire, a broad base, and narrow umbilicus; a wide aperture with a clearly expanded lip and a distinct angle where the lip joins the parietal wall; shell sculpture of prominent, widely spaced spiral lirae; and, in juvenile and young adults, a thick periostracum with numerous periostracal hairs. We also describe the living animal, operculum, radula and jaw. This is the first record of the genus Lagocheilus from the northern Western Ghats, extending its known distribution range by 540 km north into the Indian Peninsula.
Key words. Hairy land snail, Japonia, Lagocheilus hayaomiyazakii n. sp., taxonomy, Western Ghats
Publication date. 14 October 2025
DOI. https://doi.org/10.61733/jconch/4557
R. Ravinesh & N. Saravanane
Abstract. Nassa subsimilis E.A. Smith, 1906, was initially described from the Arabian Sea off Karwar on the west coast of India. Since its description, no further records have been found from India or elsewhere. Recent collections during the FORV Sagar Sampada deep-sea expeditions yielded three specimens of N. subsimilis from a seamount close to the type locality in the Lakshadweep Sea. This new material represents the first confirmed record since the collection of the type specimen 119 years ago. This rediscovery underscores the importance of deep-sea sampling and offers valuable insights into the persistence of poorly known molluscs in the Indian Ocean.
Key words. Deep Ocean Mission, Samudrayaan, taxonomy, northern Indian Ocean, Lakshadweep Sea, seamount
Publication date. 17 October 2025