Olivella (Olivella) floralia ( Duclos, 1844 )

Antunes, Luís Vítor Oliveira, Figueira, Raquel & Dilnei de Castro Oliveira, Cléo, 2022, Anatomy of the pallial cavity and associated organs in three species of Olivella (Mollusca: Neogastropoda: Olividae) from Brazil, Journal of Natural History 56, pp. 1801-1818 : 1805-1808

Olivella (Olivella) floralia ( Duclos, 1844)

( Figures 1 (a-d), 2)

Oliva floralia Duclos in Chenu, 1844: 6; Ducros 1857: 103.

Oliva oryza [non Lamarck] Duclos 1835: pl. 1, figs 9, 10; Duclos 1844: pl. 1, figs 9, 10; Reeve 1850: pl. 27, fig. 81a, b.

Oliva elongata Marrat, 1871: 32 , pl. 22, figs 386–387.

Oliva (Olivella) floralia: Weinkauff 1878: 142 , pl. 36, figs 13, 16.

Olivella floralia : Smith 1937: 131, pl. 50 fig. 7; Matthews and Rios 1967b: 116; Abbott 1974: 234, fig. 2555; Ekdale 1974: 649, fig. 4V; Merlano and Hegedus 1994: 204, pl. 63 fig. 790; Rios 2009: 273; Paulmier 2015: 9, fig. 12.

Olivella (Olivella) floralia: Olsson 1956: 174 , pl. 15, figs 12, 12a; Vokes and Vokes 1983: 27, pl. 17, fig. 6.

Geographic distribution. North Carolina, USA, to West Indies ( Smith 1937); Florida ( Olsson 1956). Mexico ( Ekdale 1974), Yucatan Peninsula ( Vokes and Vokes 1983). Antilles (Duclos in Chenu 1844; Weinkauff 1878), Guadeloupe and Martinique ( Paulmier 2015). Colombia ( Merlano and Hegedus 1994). Brazil, from Pará to Rio de Janeiro ( Rios 2009); Alagoas, Maceió ( Matthews and Rios 1967b). Present study: Brazil, Pernambuco, Ipojuca, Porto de Galinhas beach; Bahia, Salvador, Pituba beach; Rio de Janeiro, Arraial do Cabo, Prainha beach. Non-verified records: USA, North Carolina, Beaufort ( Pearse et al. 1942); Florida, Boca Ciega Bay ( Sykes and Hall 1971). Mexico, Veracruz ( Baker 1891). Cuba, Villa Clara ( Pérez and Espinosa 2016). Saint Martin Island ( Coomans 1963). Aruba ( Berschauer and Ros 2014). Venezuela, Sucre, Peninsula Paria ( Prieto et al. 2016). Brazil, Amapá and Pará ( Aller 1995); Ceará ( Rocha and Martins 1998); Bahia, Todos os Santos Bay ( Venturini et al. 2008).

Examined material

BRAZIL – Pernambuco State • 6 specimens; Ipojuca, Porto de Galinhas ; 28 August 2011; IBUFRJ 21322 . – Bahia State • 4 specimens; Salvador, Praia da Pituba ; 7 March 2012; IBUFRJ 21323 . – Rio de Janeiro State • 14 specimens, 3 ♂, 2 ♀; Arraial do Cabo, Prainha; 9 September 2010; IBUFRJ 21234 • 9 specimens, 1 ♂, 1 ♀; Arraial do Cabo ; August 2008; IBUFRJ 2135 .

Description

Shell ( Figure 1 (a–d)). Length, 10 mm, elliptical; spire conical, highly pointed; last whorl broad, about 80% of shell length. Protoconch small, smooth, with single whorl. Suture narrow, channelled. Parietal callus white, poorly developed, extending posteriorly along last whorl, not reaching suture. Aperture narrow, about 60% of shell length; outer lip thin, internal surface smooth; siphonal channel deep; pillar structure white, narrow close to inner lip, six to eight oblique plicae; fasciolar band white, bordered by well-pronounced groove. Columella reabsorbed. Operculum absent. Shell colour: translucently white, with subsutural vertical brown comma-like stripes, longitudinal brown lines from second third of last whorl to fasciolar band, non-pigmented area below subsutural pigmented zone.

Anatomy ( Figure 2 ). Auricle small, slightly triangular, base wide, about 1/5 of ventricle length. Ventricle oblong, wider near auricle, lateral groove shallow. Aorta laterally connected to ventricle. Osphradium about 13% of pallial cavity area, curved near siphon, central groove larger near siphonal aperture, lamellae spaced, bilobate, involving central axis, shorter near siphonal aperture. Gill narrow, about 20% of pallial cavity area, curved on both ends towards osphradium, lamellae compacted, triangular, apexes very arched towards rectum. Hypobranchial gland wide, occupying all space between gill and rectum. Anal gland about 20% of pallial cavity area, triangular, granulated, central region flattened. Posterior mantle lobe small, laminar, rounded to triangular. Posterior mantle tentacle tapered, longer than shell height, inserted posteriorly to mantle lobe. Siphon long, tapered, margins smooth. Anterior mantle tentacle laminar, tapered, almost as long as siphon, base wide. Male specimens: prostate large, formed by tangled tube wrapped by thin tissue, about 10% of pallial cavity area, rectum under prostate alongside pallial cavity margin. Female specimens: glandular complex about 13% of pallial cavity area, densely granulated, less towards nephridium, rectum under glandular complex, next to hypobranchial gland.

Remarks. Olivella floralia was originally illustrated by Duclos (1835) as Oliva oryza . This name, however, was already pre-occupied by a species previously described by Lamarck (1822, p. 439). Duclos (1844) corrected the mistake, changing the species name to Oliva floralia . Nevertheless, the change was not used in the subtitles of the illustration plate attributed by the author to the description of O. floralia , where it reads ‘ Oliva oryza ’.

Figures

Figure 1. Shells of studied species in distinct views. (a–d) Olivella (Olivella) floralia (Duclos, 1844) (IBUFRJ 21235). (e–h) Olivella (Olivella) nivea (Gmelin, 1791) (IBUFRJ 11145). (i–l) Olivella (Niteoliva) minuta (Link,1807) (IBUFRJ 21230). (a, e, i) Apertural view; (b, f, j) abapertural view;(c, g, k) apical view; (d, h, l) internal view showing presence/absence of columella. Scale bar: a, b, e–f, i–j = 5 mm; c–d, g–h, k–l = 1 mm.

Figure 2. Anatomy of Olivella (Olivella) floralia (Duclos, 1844). (a) Female pallial cavity; (b) male pallial cavity; (c) posterior mantle tentacle; (d) cross section of pallial cavity through middle portion of osphradium; (e): cross section of pallial cavity through anterior portion of osphradium. Scale bar: 1 mm.