Olivancillaria deshayesiana

O, Va L E R I A T E S & Pastorino, Guido, 2011, A revision of the genus Olivancillaria (Mollusca: Olividae) from the southwestern Atlantic, Zootaxa 2889, pp. 1-34 : 16-20

Olivancillaria deshayesiana (Ducros de Saint Germain, 1857)

Figures 10 , 11

Oliva deshayesiana Ducros de Saint Germain, 1857: 86, pl. 3, figs. 67 a, b.

Oliva ovata Marrat, 1871: 23 , pl. 18, figs. 281–282.

Oliva (Olivancillaria) deshayesiana . Tryon 1883: 90, pl. 86, fig. 89.

Olivancillaria deshayesiana . Lange de Morretes 1949: 101; Barattini & Ureta 1961: 127 –128, pl. 37; Figueiras 1961: 18; Thomé 1966: 167; Sicardi 1967: 57; Rios 1970: 101, pl. 31; Penchaszadeh 1971: 50; Figueiras & Sicardi 1973: 261 –262, pl. 14, fig. 189; Rios 1975: 110, pl. 32, fig. 464; Rios 1985: 110, pl. 38, fig. 486; Calvo 1987: 162, fig. 144; Borzone 1994: 27; Rios 1994: 142, pl. 46, fig. 607; Borzone 1995: 48, figs. 3–11; Borzone & Vargas 1999: 57; Scelzo et al. 2002: 50; Rocha-Barreira 2003: 113; Thomé et al. 2004: 56, N° 47; Penchaszadeh 2004: 264, figs. 21–23; Scarabino 2004: 322; Clavijo et al. 2005: 388; Demicheli & Scarabino 2006: 526; Scarabino et al. 2006: 145; Giménez et al. 2009:166, figs. 14– 22; Rios 2009: 269, N° 664; Teso & Penchaszadeh 2009: 557.

Olivancillaria auricularia . Webb 1986: partim 104–105, pl. 48, fig. 17, (non Lamarck, 1811).

Diagnosis. Shell of medium size (up to 35 mm), suboval, spire very short, apex slightly defined; posterior columellar callus thick; shell bluish grey with clear axial lines, fasciolar band light brown to grey; siphon with branched papillae.

Description. Shell suboval, solid, thick (~ 1 mm on the lip); surface polished, bright; spire very short with 3 1/ 2 slightly convex whorls; protoconch smooth of 1 1/4 translucent whorl; transition to teleoconch indistinct; suture channeled, 2/3 of last whorl, the rest covered by well-defined and uniform columellar callus; aperture elongated, wide, approximately 5/6 of total shell length; outer lip smooth, thin and slightly curved, some specimens with an anterior basal denticle posterior to fasciolar groove; posterior part of columella slightly convex and smooth, 4–6 anterior oblique folds; 1 or 2 pronounced folds parallel to columellar edge; fasciolar band well defined, brown to grey with axial bands, posterior groove deep; siphonal channel deep ( Figures 10 A–G).

Shell ultrastructure composed of three layers, as in O. auricularia ( Figure 11 G).

Radula ( Figures 11 A–B) as in O. urceus but one or sometimes two small denticles on each side of the lateral rachidian cusps. Lateral teeth C shaped, with quadrangular base.

Live animals white in general, foot pinkish and siphon purple. Penis as in O. auricularia ( Figure 11 D); siphon large, distal tip with numerous branched papillae of second and third order ( Figure 11 C).

Egg capsules semispherical, elevated, flattened and rigid, yellowish in color. A suture bisects the capsule in two equal parts. A large operculum (escape aperture) defined by a groove covering the entire capsule ( Figure 11 E). A single embryo hatches from each capsule ( Figure 11 F). Oviposition usually occurs on living substrates such as the shells of the gastropods Buccinanops monilifer (Kiener, 1834) , B. cochlidium ( Dillwyn, 1817) and B. uruguayensis (Pilsbry, 1897) .

Geographic distribution. Ilha Grande (23°09’S; 44°13’W), Rio de Janeiro state, Brazil to Necochea (38°33’S; 58°44’W), Buenos Aires province, Argentina in 0–60 m depth.

Type material. [ Oliva deshayesiana ] lectotype ( Figures 10 D–E) and one paralectotype, both housed at MNHN unnumbered, herein designated (see remarks below); [ Oliva ovata ] holotype NML 17.6.1875. Ford (1953) in a revision of the notes of Tomlin´s about Marrat´s type material mentioned the existence of one specimen that he regarded as holotype. According to ICZN article 73.1.2, “If the taxon was established before 2000 evidence derived from outside the work itself may be taken into account to help identify the specimen”. On this basis the specimen of Oliva ovata should be considered the holotype.

Type locality. [ Oliva deshayesiana ] erroneously described from the coast of California. Tryon (1883) restricted its distribution to South America. [ Oliva ovata ] unknown.

Other material examined. Brazil. Ilha Grande, Rio de Janeiro (RJ): MORG 14218 (40–60 m); Praia Grande, São Paulo ( SP): MZUSP 82769 (10 m); SP: MNRJ 14147, 14171; Porto Belo, Santa Catarina (SC): MZUSP 32900; Torres, Rio Grande do Sul (RS): MORG 6071, 47658 (intertidal); Passo da Lagoa, RS: MORG 8833 (40 m); Tramandaí, RS: MORG 13709 (60 m); São José do Norte, RS: MORG 15215; Mostardas, RS: MORG 8231 (15–25 m), 8428 (18 m); Cassino, RS: MNHNM 3649, 9039, MORG 4061, 5370, 14471, 15396, 31390, 39224, 40180, MNRJ 776, 3593, 6918, 7112, 8537; MZUSP 16199, 62722; Rio Grande, RS: MORG 23142 (23 m), 41496, 42703 (10–20 m), 43021 (10–20 m), 45802, MZUSP 32729, 32732, 32891, 32900, 43086, 43091, 51037, 62796 (22 m); Sarita, RS: MORG 33150; Chuí, RS: MORG 4525, 14024. Uruguay. La Coronilla, Rocha: MNHNM 280, 379, 9026, MORG 16239, 47369, 49198, MNRJ 1773; Cabo Polonio, Rocha: MNHNM 9058, La Paloma, Rocha: MLP 4334-1, MNHNM 3811, 3867, 4235, 4419, 9028, 9032, 9033, 9034, 9035, 9036, NMR 62166, MORG 137, 9501, 19052, 32606, MZUSP 33449, 51039, 69708 (10–15 m), MNRJ 1242, 6452, 6534; Punta del Este, Maldonado: MNHNM 2106, 9029; Carrasco, Canelones (Quaternary): MNHNM 781, 9031. Argentina. San Clemente del Tuyú, Buenos Aires: MLP 9585; Mar del Tuyú, Buenos Aires: MORG 26072; San Bernardo, Buenos Aires: MORG 43083 (5 m); Mar de Ajó: Buenos Aires MNHNM 9063; Villa Gesell, Buenos Aires: MNHNM 9027; Mar Chiquita: Buenos Aires: MNHNM 9037, 9061, 9069, MORG 8710; Mar del Plata, Buenos Aires: MACN-In 9361-076, 9363-014, 12065, 35958, 37503, 38160, MLP 3099, MNHNM 2179, 9064, 9065, 9066, 9590, MORG 9026, 10805 (40 m), 11285 (40 m), 11169 (40 m), MZUSP 51031 (40 m), 74081, MNRJ 8600; Necochea, Buenos Aires: MLP 3093. Patagonia: NHMUK 1854.12.4.416.

Remarks. This is perhaps the most conservative species of the genus Olivancillaria with very little shell variation. According to the literature records O. deshayesiana was recently included in the Argentine fauna despite its usual presence in shallow waters. After the original description several authors cited Duclos as the author of O. deshayesiana however Ducros de Saint Germain is the original author. In agreement with the ICZN article 74 and in order to preserve stability of nomenclature, we designate as lectotype the (unnumbered) specimen (of 26.7 mm of total shell length) and the other one as paralectotype, both housed at MNHN. The holotype of Oliva ovata Marrat, 1871 housed at NML 17.6.1875 shows it as a synonym as it was previously reported by Tryon (1883).

Figures

FIGURE 10. Olivancillaria deshayesiana (Ducros de Saint Germain, 1857). A – C, from Mar del Plata, Buenos Aires province, Argentina; D – E, holotype of Oliva ovata NML 17.6.1875; F – G, lectotype of Oliva deshayesiana MNHN unnumbered, scale bars = 1 cm.

FIGURE 11. Olivancillaria deshayesiana. A – B, radula, A, frontal view, scale bar = 100 µm, B, detail of rachidian teeth, scale bar = 50 µm; C, siphon tip, critical-point dried, scale bar = 1 mm; D, penis, critical-point dried; scale bar = 1 mm; E, egg capsule, scale bar = 500 µm; F, embryo shell, from Mar del Plata, Buenos Aires province, Argentina, scale bar = 250 µm; G, ultrastructure of the shell, scale bar = 200 µm.