Epitonium striatellum ( Nyst, 1871 )

Zelaya, Diego G. & Güller, Marina, 2017, Undercover speciation of wentletraps (Caenogastropoda: Epitoniidae) in the Southwestern Atlantic, Zootaxa 4286 (1), pp. 41-69 : 49-50

publication ID

https://doi.org/ 10.11646/zootaxa.4286.1.2

publication LSID

lsid:zoobank.org:pub:3B62E1C2-79C6-4A14-9F6D-80D8872118FA

DOI

https://doi.org/10.5281/zenodo.6033219

persistent identifier

https://treatment.plazi.org/id/03BCFB5F-FFD2-FFFE-FF26-FD6E370BEB85

treatment provided by

Plazi

scientific name

Epitonium striatellum ( Nyst, 1871 )
status

 

Epitonium striatellum ( Nyst, 1871) View in CoL

( Figure 5 View FIGURE 5 )

Scalaria tenuistriata d’Orbigny, 1839: 390 , pl. 54, figs. 4–6

Scala striatella Nyst, 1871: 134 View in CoL –135 (nomen novum pro Scalaria tenuistriata d’Orbigny, 1839 non Bronn, 1831) Epitonium (Asperiscala) tenuistriatum: Clench & Turner, 1952: 299 View in CoL –300, pl. 138; Rios, 1994: 98, pl. 32, fig. 397 Epitonium tenuistriatum: Castellanos, 1970: 63 View in CoL , pl. 4, fig. 8; Scarabino, 1977: 183, pl. 2, fig. 9

Type locality. Bahía Blanca [38°42’S 62°10’W, Buenos Aires Province, Argentina]. GoogleMaps

Type material. Lectotype (NHMUK 1854.12.4.359/1) and one paralectotype (NHMUK 1854.12.4.359/2) [not examined].

Material examined. Uruguay: Rocha: [33°54’00’’S 53°31’00’’W], La Coronilla (MACN-In 19214: 2 sh.); [34°23’S 53°47’W], Cabo Polonio ( USNM 359204 View Materials : 1 sh); [34°39’0’’S 54°10’0’’W], La Paloma (MACN-In 29687: 13 sh.; MACN-In 28767: 3 sh.); [34°39’36’’S 54°09’21’’W], Cabo Santa María GoogleMaps , Rocha (MACN-In 15305: 1 sh.) . Argentina: Buenos Aires Province : 38°25’18.50’’S 56°30’37.07’’W, off Mar del Plata (MACN-In 10740: 1 sh.; MACN-In 11995: 1 sh.); [38°53’13’’S 62°05’52’’W], Base Naval Puerto Belgrano, Punta Alta (MACN-In 6620- 23: 1 sh.; MACN-In 11211: 2 sh.); [39°42’S 62°07’W], mouth of Río Colorado (MLP-Ma 1375: 9 sh.) GoogleMaps ; 40°18’29.79’’S 62°14’15.66’’W, Bahía San Blas (MACN-In 20266: 2 sh.) GoogleMaps . Río Negro Province: [41°00’S 64°07’W], Aguada de los Loros, San Antonio Este (MACN-In 13339-1: 3 sh.; MACN-In 13340: + 100 sh.); [40°49’S 64°54’W], Punta Villarino, San Antonio Este (MACN-In 13365: 3 sh.) GoogleMaps ; 40°29’35.2’’S 65°31’44.7’’W, Las Grutas, 6 m (MACN-In 40376: 1 sh.); 40°45’18.7’’S 64°56’31.8’’W, La Mar Grande, intertidal (MACN-In 40377: 8 sh.); 40°54’00.0’’S 65°06’43.1’’W, 6 m (MACN-In 40378: 1 sh.); 40°54’08.3’’S 65°06’28.0’’W, 9 m (MACN-In 40379: 1 sh.).

Known distribution. Rio de Janeiro (22°54’S), Brazil ( Rios 1994) to Golfo San Matías (40°54’S) , Río Negro Province, Argentina. Bathymetric range of living specimens unknown; shells found from the intertidal to 9 m.

Description. Shell large (maximum L observed = 23.9 mm, apex missing; to 28.5 mm according to Clench & Turner (1952)), elongate, thin, white, translucent ( Fig. 5 View FIGURE 5 A–C, E, F). Protoconch and first whorls of teleoconch very eroded in all available specimens ( Fig. 5 View FIGURE 5 D). Teleoconch with up to 8 whorls, slightly convex in outline; suture deep, partially covered by axial sculpture ( Fig. 5 View FIGURE 5 A–C, E, F, H); last whorl evenly curved at the base. Aperture ovate; peristome with a small basal expansion. Outer margin slightly thickened. Fasciole small. Umbilicus absent ( Fig. 5 View FIGURE 5 A–C, E, F).

Teleoconch densely sculptured with axial and spiral elements, which form a cancellate pattern ( Fig. 5 View FIGURE 5 A–C, E, F, H, I). Axial ribs prosocline, extremely low, recurved, giving the appearance of thin, rounded cords, formed by fusion of several layers, obliquely aligned between adjoining whorls ( Fig. 5 View FIGURE 5 G–I). Number of ribs increasing in successive whorls: from 36–40 in the first whorl to 52–58 in the last whorl of larger studied specimens. Ribs evenly curved along the whorl, well-entering into the suture, fused at their bases with the ribs of adjacent whorl ( Fig. 5 View FIGURE 5 H); ribs on the last whorl extending to the umbilical area. Interspaces between ribs with numerous, thick spiral threads, as wide as axial elements in the first whorl, slightly narrower than axial sculpture in subsequent whorls ( Fig. 5 View FIGURE 5 H, I). Among spiral elements it is possible to recognize primary and secondary threads, which produce rectangular interspaces in their intersection with axial sculpture ( Fig. 5 View FIGURE 5 H, I). Spiral sculpture not crossing over axial sculpture.

Operculum, jaw and radula: Unknown.

Remarks. Although Nyst (1871) noted the homonymy of Scalaria tenuistriata d’Orbigny, 1839 and Scalaria tenuistriata Bronn, 1831 , and proposed Epitonium striatellum (formerly under Scala ) as a replacement name for the first, subsequent literature (e.g., Clench & Turner 1952; Castellanos 1970; Scarabino 1977; Rios 1994) retained the usage of d’Orbigny’s name.

Lima et al. (2012) provided a list of the Epitonium species present in the Atlantic coast of South America. In their list, the authors omitted both E. tenuistriatum and E. striatellum , but listed Epitonium striatissimum (Monterosato, 1878) as being present in Argentine waters. That species is distributed in the Mediterranean, Madeira, and SE United States, from North Carolina to Florida ( Bouchet & Warén 1986), with no documented records in Patagonia thus far known.

USNM

Smithsonian Institution, National Museum of Natural History

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Architaenioglossa

Family

Epitoniidae

Genus

Epitonium

Loc

Epitonium striatellum ( Nyst, 1871 )

Zelaya, Diego G. & Güller, Marina 2017
2017
Loc

Scala striatella

Rios 1994: 98
Scarabino 1977: 183
Castellanos 1970: 63
Clench 1952: 299
Nyst 1871: 134
1871
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