Tiberia sp.

Gofas, Serge, Luque, Ángel A., Oliver, Joan Daniel, Templado, José & Serrano, Alberto, 2021, The Mollusca of Galicia Bank (NE Atlantic Ocean), European Journal of Taxonomy 785 (1), pp. 1-114 : 66

Tiberia sp.

Fig. 28D‒F

Material examined

GALICIA BANK • 1 spm, 2 sh; 42°41.87′ N, 11°26.71′ W; 1720 m; 8 Aug. 2011; BANGAL 0711 V10; MNCN.

Remarks

The genus Tiberia is diagnosed by being umbilicate and having a straight columella with three folds, of which the two abapical ones are inconspicuous. The type species Pyramidella minuscula Monterosato, 1880 has a rather thick shell with brown spiral bands, one below the suture and another one above it, prolonged on the middle part of the last whorl. One specimen collected in 1720 m deep on GB ( Fig. 28D‒F ) is definitely a Tiberia but differs from T. minuscula in being colourless, and in having a very thin shell with a markedly keeled last whorl.

Pyramidella curtissima Locard, 1897, described from deep water (Travailleur 1881, stn 3, 3307 m; stn 30, 1203 m; Travailleur 1882, stn 13, 2030 m) off Portugal, is much stouter than the specimen illustrated here. The figured syntype could not be traced in the “Travailleur” and “Talisman” collection of MNHN, Paris; one shell with no indication of station number, labelled “ Portugal ” ( Fig. 28G ) is in poor condition, and four other shells from “Travailleur” 1881 stn 31 (not mentioned in Locard 1897) are the rissoid Benthonella tenella .

Without additional material at hand, the observed differences are not sufficient to demonstrate that our specimen is specifically distinct from T. minuscula and it is therefore reported as Tiberia sp.

Figures

Fig. 28. Heterobranchia 1 (Architectonicidae, Pyramidellidae). A–C. Solatisonax hemisphaerica (Seguenza, 1876), BANGAL 0711, V6, 909 m, 8.9 mm.D–F. Tiberia sp., BANGAL 0711, V10, 1720 m, 4.8 mm. G. Syntype of Pyramidella curtissima Locard, 1897, Travailleur 1881 or 1882, 4.0 mm. H. Turbonilla cf. paucistriata (Jeffreys, 1884), BANGAL 0711, V5, 1631 m, 7.8 mm. I–J. Eulimella sp., BANGAL 0711, V10, 5.3 mm. K–L. Tibersyrnola unifasciata (Forbes, 1844), BANGAL 0711, V6, 7.2 mm. Scale bars: A–E, G–L = 1 mm; F = 200 µm.