Navarriella Boeters, 2000

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 : 8-9

Navarriella Boeters , 2000

Synonyms

Alzoniella (Navarriella) Boeters, 2000: 160–161 .

Type species: Paludinella elliptica Paladilhe, 1874 . Designated by Boeters (2000).

Diagnosis

Shell cylindrical with a rounded apex; aperture obliquely ovate; periostracum pale yellow to whitish; protoconch low and dome shaped. Operculum corneous, orangish, thin, pliable, oval, paucispiral, with a submarginal nucleus. Two pairs of basal cusps on the central radular tooth. Ctenidium well developed. Bursa copulatrix large, pyriform, pedunculated, and lying against the posterior section of the albumen gland; two seminal receptacles with a long duct; Sr2 smaller than Sr1 and arising at the renal oviduct loop. Penis unpigmented, strap-like; distal end of the penis gradually tapering; more than two penial lobes. Nervous system scarcely pigmented, moderately concentrated with cerebral ganglia roughly equal in size.

Remarks

Navarriella is a monospecific genus, belonging to an independent lineage separate from Alzoniella , and it is unclassified within the subfamily Islamiinae ( Fig. 3A ). The COI average sequence divergence with the type species A. finalina is 18.54%. Morphologically, Alzoniella differs from Navarriella by the presence of two sessile seminal receptacles and two penial lobes. Navarriella has cylindrical shells with a height of 1.5–2.2 mm ( Boeters 2000, 2001, Arconada, Bolán & Boeters, 2007), whereas the shells of Alzoniella are conic to cylindrical-conic with a height of 0.7–2.5 mm ( Giusti and Bodon 1984). Guadiella Boeters, 2003 differs from Navarriella by having a single seminal receptacle, a slender penis without penial lobes, and narrow, cylindrical to slightly conical shells with a height of 1.40–1.70 mm ( Boeters 2003, Arconada, Bolán & Boeters, 2007).

Figures

Figure3.Phylogenetic relationships ofhydrobiid taxa incorporating thespecies of Alzoniella(Navarriella).A,Bayesian tree ofthe family Hydrobiidae basedon theconcatenated dataset (COI and 18S), including some selected species ofthe hydrobiidsubfamilies (highlighted with vertical bars). Brancheswith bootstrap support (BS) values fromthe maximumlikelihood (ML) analysis and Bayesian posterior probabilities(BPP) greater than 75% and 0.95,respectively,are indicatedwith asterisks.Branches only with BS> 75% are denoted with a triangle.Branchesonly with BPP> 0.95are shownwith a square.B, Bayesian phylogenetictree ofspecimens of Alzoniella (Navarriella) based onthe concatenated dataset(COI, 16S, H3, and 28S).BS and BPP areprovided abovebranches when greaterthan 75% and 0.95,respectively.The first vertical bar representsthe taxonomic species of eachpopulationassigned in previous studies asAlzoniella (Navarriella) elliptica (in red)and Alzoniella (Navarriella) pellitica (in blue).The remaining vertical barsrefer to thespecies delimitation methods:ABGD,distance-based automatic gap discovery;GMYC, single-thresholdgeneralized mixed Yule-coalescent;bPTP, Bayesian approach ofthe Poisson Tree Processes;mPTP,multirate PoissonTree Processes.ThebPTP bar is displayed with its Bayesian support value.Labelabbreviations areexplained in Supporting Information,Table S2. Scale bars:expected change per site.