Navarriellinae, García-Guerrero & Miller & Delicado & Novo & Ramos, 2024

García-Guerrero, Fernando, Miller, Jonathan P., Delicado, Diana, Novo, Marta & Ramos, Marian A., 2024, A systematic review of the Iberian springsnail subgenus Alzoniella (Navarriella) (Caenogastropoda: Hydrobiidae), with the description of a new potentially relict subfamily, Zoological Journal of the Linnean Society 202, pp. 1-17 : 7

Navarriellinae subfam. nov. García-Guerrero, Miller and Ramos

ZooBank registration: urn:lsid:zoobank.org:act:FF20DC48-F862-4456-B5FC-960275C7ED78 .

Type genus: Navarriella Boeters, 2000 .

Diagnosis

Shell cylindrical with rounded apex, whorls moderately convex and umbilicus covered by the inner lip. Periostracum pale yellow to whitish. Operculum corneous, orangish, thin, pliable, oval, paucispiral, with a submarginal nucleus. Radula taenioglossate; two pairs of basal cusps on the central radular tooth. Bursa copulatrix large in size. Two seminal receptacles with a long duct. Penis strap-like to gradually tapering with several penial lobes.

Remarks

Navarriellinae is a monotypic subfamily and represents a highly divergent lineage within the Hydrobiidae , distantly related to the other 13 formally recognized subfamilies ( Delicado et al 2023; fig. 2). While its species may have shell shapes similar to those of other hydrobiid subfamilies, they can be anatomically distinguished. All Islamiinae (including Alzoniella ) differ from Navarriellinae by the presence of one or two sessile seminal receptacles and one or two penial lobes ( Radoman 1973, 1983, Giusti and Bodon 1984, Arconada and Ramos 2006); all Belgrandiellinae differ from Navarriellinae by a single Sr1 and one penial lobe ( Radoman 1983); all Belgrandiinae differ from Navarriellinae by two sessile seminal receptacles and one penial lobe ( Boeters 1988, Haase 2000); and all Bullaregiinae differ from Navarriellinae by a Sr1 and one penial lobe ( Khalloufi et al. 2017, Delicado et al. 2023). Navarriellinae also differs from the phylogenetically closely related subfamilies Hydrobiinae W. Stimpson, 1865, Mercuriinae Boeters & Falkner, 2017, Nymphophilinae D.W. Taylor, 1966, and Pseudamnicolinae Radoman, 1977 according to its cylindrical shell, narrower cusps on the central and lateral radular teeth, and the presence of more than one seminal receptacle on the renal oviduct and various penial lobes.