Suavotrochus lubricus ( Dall, 1881 ),

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 sp, Zootaxa 4609 (3), pp. 401-428: 423

publication ID

https://doi.org/10.11646/zootaxa.4609.3.1

publication LSID

lsid:zoobank.org:pub:F38E6655-0EC4-48E1-A002-CAC599F3556D

persistent identifier

http://treatment.plazi.org/id/4A3387DC-FFA8-FFEC-FF6D-FC519CAF950B

treatment provided by

Plazi

scientific name

Suavotrochus lubricus ( Dall, 1881 )
status

 

Suavotrochus lubricus ( Dall, 1881) 

( Fig. 9View FIGURE 9 H–L)

Synonymy see Quinn (1979). Complement: Margarita lubrica Dall, 1881: 44  . Solariella (Suavotrochus) lubrica: Quinn, 1979: 42  , figs 68–74. Solariella lubrica: Springer & Bullis, 1956: 25  ; Lopes & Cardoso, 1958: 62; Rios, 1975: 21, pl. 4, fig. 46; Rios, 1985: 23, pl. 10,

fig. 96; Rios, 1994: 36, fig. 109; Gracia et al., 2004: 50, fig. 17; Miyaji, 2004: 78; Benkendorfer & Soares-Gomes, 2009:

150; Rios, 2009: 56, text fig.; Rosenberg et al., 2009: 623; Barros, 2010: 62, figs 22–28; Miloslavich et al., 2010: table S6;

Welch, 2010: table S1; Daccaret & Bossio, 2011: 54, fig. 91. Suavotrochus lubricus: Bouchet, 2015  .

Type material. Lectotype: USNM 95061View Materials. 

Type locality. Cuba, North of Havana, Blake sta. 2, 23º14’N, 82º25’W, 1472 m (24/v/1893)GoogleMaps  .

Distribution. From Florida Straits to southernmost Brazil, 73–1472 m ( Rosenberg et al. 2009). Quinn (1979), however, remarked that the species might actually inhabit only depths up to 500 m, being carried post-mortem to greater depths. Barros (2010) gave a bathymetric range of up to 5633 m of depth based on empty shells.

Habitat. Muddy bottoms ( Barros et al., 2008)

Material examined. Brazil: Espírito Santo: off São Mateus, continental slope of Abrolhos, 18°59’S, 37°50’W, MD 55 sta. DC 75, 295 m, MNHN, 100 sh (27/v/1987). Rio de Janeiro: East of Cabo de São Tomé, 21°31’S, 40°08’W, MD 55 sta. CB 96, 295– 300 m, MNHN, 1 sh (31/v/1987); S of Cabo Frio, 23°41’S, 42°06’W, MD 55 sta. CB 104, 430– 450 m, MNHN, 50 sh (02/vi/1987). Additional non-MD55 material: Cuba: lectotype.

Measurements. 5½–6 whorls, H=5.0– 5.5 mm, D=4.0– 4.5 mm (n=20).

Remarks. This species is by far the most abundant trochoid found in the MD55 material. The present specimens compare very well with the lectotype, even though they show an overall less-pronounced sculpture; this is in line with the known degree of morphological variation of this species ( Quinn 1979). The variety (subspecies) Margarita lubrica iridae  was described by Dall (1889) as a nearly smooth form (lectotype USNM 95063, paralectotype USNM 887343), but was later considered a synonym of S. lubricus  by Quinn (1979), who observed several intermediate stages between these two forms.

Interestingly, some specimens from one locality (sta. CB96) have the teleoconch sculptured by regularly spaced well-marked prosocline ribs. Moreover, S. lubricus  has some axial corrugations restricted to the periumbilical area ( Fig. 9 JView FIGURE 9), but in these specimens the corrugations seem to be expanded, forming complete ribs ( Fig. 9 LView FIGURE 9). To the best of our knowledge, this feature has never been reported for this species. In the present specimens, the axial sculpture is of variable strength and there are even completely smooth specimens.