Idiopyrgus umbraticola ( Simone & Salvador, 2021 )

Salvador, Rodrigo Brincalepe & Bichuette, Maria Elina, 2024, Idiopyrgus Pilsbry, 1911 (Gastropoda, Tomichiidae): a relict genus radiating into subterranean environments, Zoosystematics and Evolution 100 (4), pp. 1543-1556 : 1543-1556

Idiopyrgus umbraticola ( Simone & Salvador, 2021) comb. nov.

Spiripockia umbraticola Simone & Salvador, 2021: 3123, figs. 2, 3; Salvador et al. 2022 b: 2, figs. 8, 9.

Remarks.

Spiripockia umbraticola is known only from the type locality, Gruna do Domingão cave (Carinhanha municipality, Serra do Ramalho region, Bahia state). When Simone and Salvador (2021) described that species, we still did not have the understanding of Idiopyrgus and of the family Tomichiidae in Brazil that we have today ( Salvador et al. 2022 a). Hence, those authors classified the new species in Spiripockia , heavily influenced by the presence of periostracal hairs on the teleoconch and by the fact that the animals were cavernicolous. Nevertheless, the overall shell shape of Spiripockia umbraticola was very different from Spiripockia punctata Simone, 2012 , the type species of the genus and, at that point, the only species within it. The anatomical similarities between those two species are within expectations in Truncatelloidea , and some meaningful differences in the reproductive trait were observed by Simone and Salvador (2021).

Spiripockia umbraticola is morphologically very similar to I. eowynae sp. nov. (see above), which the present phylogenetic analysis has placed with full support within Idiopyrgus (Fig. 3 ). Thus, based on the new morphological and phylogenetic evidence, Spiripockia umbraticola is here reclassified as Idiopyrgus umbraticola ( Simone & Salvador, 2021), comb. nov.

The genus Spiripockia , therefore, returns to being monotypic, including only Spiripockia punctata . However, considering the newly recognised Gondwanan family Tomichiidae in Brazil ( Salvador et al. 2022 a; Lawrie et al. 2023) and the new findings presented here, the family-level classification of Spiripockia (formerly Pomatiopsidae , presently Cochliopidae ; Simone and Salvador 2021) and its status as a distinct genus needs to be reassessed. Previous attempts to obtain genetic sequences from this species failed ( Simone and Salvador 2021), and new specimens must be obtained to that end. Furthermore, we lack a consensus of what the anatomical features of Brazilian Cochliopidae and Tomichiidae are, i. e., which are pleiomorphic and which are apomorphic, and more importantly, which can be used as diagnostic features (a confusion already noted by Simone and Salvador 2021 in relation to Cochliopidae in general and other truncatelloid clades as well). That will only be achieved by a thorough anatomical study of both families in Brazil, alongside a solid phylogenetic backbone built on genetic data.

Figures

Figure 3. Bayesian inference phylogenetic tree based on concatenated but unlinked markers, highlighting the family Tomichiidae and showing the position of the new species in the genus Idiopyrgus and its relationship to its congeners. Posterior probabilities are shown on the nodes. Scale bar is substitutions per site.