Bulimulus brunoi ( Ihering, 1917 )

Salvador, Rodrigo B., Cunha, Carlo M. & Simone, Luiz Ricardo L., 2013, Taxonomic revision of the orthalicid land snails (Pulmonata: Stylommatophora) from Trindade Island, Brazil, Journal of Natural History (J. Nat. Hist.) 47 (13 - 14), pp. 949-961 : 950-953

Bulimulus brunoi ( Ihering, 1917)

( Figures 2A–F )

Loboa brunoi Ihering 1917: 121 (pl. 4, fig. 7).

Bulimulus (Protoglyptus) brunoi: Bartsch 1918: 53 (pl. 4, fig. 7).

Protoglyptus brunoi: Morretes 1949 ; Lanzieri, 1966: 169.

Bulimulus brunoi: Breure 1978: 142 (figs 232–235); Breure 1979; Salgado and Coelho 2003; Simone 2006: 117 (fig. 356).

Holotype

MNRJ 1128 (examined; Figure 2A–C ).

Type locality

Trindade Island.

Distribution

Endemic to Trindade Island. The species seems to occur next to or on the beach ( Lanzieri 1966; personal observations).

Etymology

Species dedicated to Prof. Bruno Lobo (MNRJ).

Diagnosis

Weak callus on parietal region of aperture. Teleoconch sculptured by fine prosocline axial riblets bearing tiny round and regularly spaced nodules, giving impression of checked pattern. Mixed protoconch sculpture: regularly spaced parallel axial riblets (first 11 / 2 whorl) and anastomosing striae (next 1 / 2 whorl).

Redescription

Shell medium-sized, conical-turreted, with acuminated apex; spire high; seven whorls. Colour dirty white. Spire angle ∼40 ◦. Greatest width on body whorl; width about twofifths shell length. Protoconch sculptured by regularly spaced parallel axial riblets for first 11 / 2 whorls, and by fine anastomosing striae for another 1 / 2 whorl; transition to teleoconch unclear. Teleoconch sculpture by fine prosocline and irregular axial riblets and by fine spiral striae, their encounter forming tiny round and regularly spaced nodules and looking like checked pattern. Suture well-marked, slightly oblique (diagonal) to columellar axis. Whorl profile convex. Aperture weakly prosocline, medium-sized, oval, slightly anteroposteriorly elongated; about two-fifths of shell length, about onehalf of shell width. Weak callus on parietal region of aperture. Lamellae or teeth absent. Lip thin, simple, non-reflected, with exception of upper columellar region (reflected and covering umbilicus). Body whorl about three-fifths of shell length. Umbilicus rimate, almost imperforate.

Measurements (in mm)

Holotype. H = 19.4; D = 7.5.

Mean (n = 32). H = 18.0 ± 1.2 (max 20.6; min 16.1); D = 7.8 ± 0.4 (max 8.8; min 7.3); S = 11.4 ± 1.0 (max 14.3; min 10.0); S′ = 8.4 ± 0.7 (max 10.5; min 7.0); h = 6.5 ± 0.4 (max 7.5; min 5.7); d = 4.0 ± 0.3 (max 4.8; min 3.4).

Material analysed

BRAZIL. Trindade Island: MNRJ 1128 (one shell, holotype), 1129 (one shell). Southwest Trindade Island: MNHN (four shells); MZSP 104741 (one shell). Andradas Beach ( Praia dos Andradas ): MZSP 101245 (35 shells). Tartarugas Beach ( Praia da Tartarugas ): MZSP 29742 (one shell), MZSP 101398 (one shell).

Remarks

Only the shell of B. brunoi is known; unfortunately, no complete animal has so far been recovered. The overall high-spired shell profile, albeit not being very common in the genus, is not unknown, as testified by the very similar shell shapes of some other Brazilian species, like, for instance, B. felipponei Marshall, 1930 and B. sporadicus (d’Orbigny, 1835) . It can be differentiated from these species by its sculpture pattern ( Figure 2F ) and the callus on the parietal region of the aperture. This last feature closely resembles another widespread Brazilian bulimuline genus, Rhinus Martens in Albers, 1860, in which it is commonly found. The protoconch sculpture of B. brunoi ( Figure 2E ) is somewhat unusual in the genus, but some species, such as B. guadalupensis (Bruguière, 1789) , show similar patterns ( Breure 1979). A similar protoconch sculpture can be found in some species of Thaumastus Albers, 1860 , specially of the subgenus Thaumastiella Weyrauch, 1956 ( Breure 1979) ; moreover, the overall shell shape of B. brunoi is also reminiscent of some species of this genus. Nevertheless, the number of whorls, their convex profile, the umbilicus and the aperture lacking a lamella, all point to a closer affinity with Bulimulus .

Figures

Figure 2. (A–C) Bulimulus brunoi (holotype, MNRJ 1128; H = 19.4 mm). (D) B. brunoi (MNRJ 1129; H = 20.7 mm). (E, F) B. brunoi, protoconch and teleoconch sculpture (MZSP 101245). (G) Naesiotus arnaldoi (holotype, MNRJ 3105; H = 9.5 mm). (H–J) N. arnaldoi (MZSP 104740; H = 10.8 mm). (K) N. arnaldoi (paratype, MNRJ 3105; H = 10 mm). (L) N. arnaldoi, protoconch sculpture (MZSP 101244). (M–O) Vegrandinia trindadensis (MZSP 104742; 5.2 mm). (P, Q) V. trindadensis (holotype, MNRJ 3711; H = 7 mm). (R, S) V. trindadensis (MZSP 104743), (R) protoconch sculpture, (S) broken aperture showing the lamellae.