Calliostoma caribbechinatum Landau, Van Dingenen & Ceulemans, 2017

Cavallari, Daniel C., Salvador, Rodrigo B., Dornellas, Ana P. S. & Simone, Luiz R. L., 2019, Calliostomatidae, Colloniidae, Margaritidae, and Solariellidae (Gastropoda: Trochoidea) collected by the Marion Dufresne (MD 55) expedition in southeastern Brazil, with description of a new species of Calliostoma, Zootaxa 4609 (3), pp. 401-428 : 403

Calliostoma caribbechinatum Landau, Van Dingenen & Ceulemans, 2017

( Fig. 1 A–D)

Synonymy see Leal (1991). Complement:

Calliostoma echinatum Dall, 1881: 47 ; Leal, 1991: 44, pl. 3, fig. A; Benkendorfer & Soares-Gomes, 2009: 147; Massemin et al., 2009: 84, pl. p83; Rios, 2009: 51, text fig.; Rosenberg et al., 2009: 623; Dornellas, 2012: 103.

Calliostoma caribbechinatum Landau, Van Dingenen & Ceulemans 2017: 123 .

Type material. Holotype: USNM 214270 .

Type locality. Cuba, off Havana, Blake sta. 62, 146 m (Agassiz & Sigsbee leg., 1877) .

Previously known distribution. From Cuba to southern Brazil, live specimens down to 146 m ( Benkendorfer & Soares-Gomes, 2009; Rosenberg et al., 2009).

New occurrence. Abrolhos Slope, 60–295 m (shells only).

Habitat. Coralline and muddy bottoms.

Material examined. Brazil: Espírito Santo: off São Mateus, Abrolhos Slope, 18°59’S, 37°50’W, MD 55 sta. DC 75, 295 m, MNHN, 1 sh (27/v/1987); Jaseur Seamount, 20°26’S, 36°17’W, MD 55 sta. DC30, 60 m, MNHN, 2 sh (15/v/1987), 20°27’S, 35°54’W, MD 55 sta. DC34, 54 m, MNHN, 5 sh (15/v/1987); Dogaressa Seamount, 20°50’S, 33°44’W, MD 55 sta. DC43, 63 m, MNHN, 3 sh (17/v/1987). Rio de Janeiro: off Cabo de São Tomé, 21°37’S, 40°18’W, MD 55 sta. DC15, 37 m, MNHN, 1 sh (10/v/1987). Additional non-MD55 material: Cuba: holotype.

Measurements. 6½–7 whorls, H= 4.9–6.1 mm, D= 4.5–5.5 mm (n=12).

Remarks. The name Calliostoma caribbechinatum was introduced by Landau et al. (2017) as a replacement for C. echinatum Dall, 1881 , a junior secondary homonym of C. echinatum ( Millet, 1865) , a fossil species from the Miocene of France. In his study about selected specimens from the MD55 expedition, Leal (1991) reported the occurrence of C. caribbechinatum (as C. echinatum Dall, 1881 ) on the islands of Trindade and Martim Vaz as well as the seamounts Jaseur, Davis, and Dogaressa, but did not mention the Abrolhos Slope (sta. DC75). This location is newly reported herein and it is also the deepest occurrence of the species known so far, expanding the previous maximum depth record from 220 m to 295 m. Even though the specimens examined here are exclusively empty shells, some are very well preserved, which at least means they were collected not too long after death and likely not far removed from their living area.

Figures

FIGURE 1. Calliostoma collected by the MD55 expedition. A–D. Calliostoma caribbechinatum. A. MNHN, sta. DC30, apertural view (H=6.4 mm, D=5.8 mm). B. same, apical view. C. MNHN, from Trindade Island, juvenile specimen, apertural view (H=1.9 mm, D=1.7 mm). D. MNHN, sta. DC43, detail of apex. E–I. Calliostoma gemmosum. E. MNHN, sta. DC83, apertural view (H=11.0 mm, D=10.9 mm). F. same, apical view. G. same, umbilical view. H. MNHN, sta. DC27, juvenile specimen, apertural view (H=3.3 mm, D=3.5 mm). I. MNHN, sta. DC26, detail of apex.