Anatoma rolani, Geiger, Daniel L. & Fernández-Garcés, Raúl, 2010

Geiger, Daniel L. & Fernández-Garcés, Raúl, 2010, Anatoma rolani n. sp. and new records of rare Caribbean Anatoma species (Gastropoda: Vetigastropoda: Anatomidae), Zootaxa 2488, pp. 65-68 : 65-67

Anatoma rolani new species

( Fig. 1A )

Type material. Holotype ( LACM 3120: Fig. 1A ). Nine paratypes ( LACM 3121, 9). One paratype ( LACM 3122). All from type locality. Seven paratypes (coll Fernández-Garcés), four paratypes ( MHNS), both lots 40 m, Rancho Luna, Cienfuegos, Cuba, 22.017˚N, 80.430˚W. 20 paratypes ( MHNS) 10–20 m, Puerto Morelos, Yucatán, Mexico, 20.818˚N, 86.817˚W.

Type locality. 35 m, Kittery beach, Guantanamo Bay, Oriente Province, Cuba, 19.883˚N, 75.117˚W.

Etymology. The name honors Emilio Rolán for his contributions to the knowledge of the Caribbean malacofauna.

Description. Shell medium size (holotype = 1.7 mm), trochiform biconical. Protoconch of 0.75 whorls, smooth, no apertural varix, apertural margin slightly convex. Teleoconch I of 0.6 whorls, 13 axials, initially tall cords, then low lamellae; no spirals. Teleoconch II of two whorls, suture moderately impressed, more than width of selenizone from selenizone of previous whorl. Shoulder with many fine axial lamellae, on first half whorl upright, then with strong forward inclination, as if pressed down; spiral sculpture very diffuse; first signs due to slight thickenings on lamellae after one whorl; approximately 12 teeth in serrated profile of lamellae, no serration close to suture. Base without constriction below selenizone, sculpture as on shoulder with approximately 12 teeth in serrated profile of lamellae. Umbilicus very narrow, continuously sloping with base, no funiculus. Aperture rounded, roof overhanging. Selenizone at periphery; keels moderately strong, quite elevated; lunules distinct, dense; slit open, margins converging. Animal unknown.

Distribution. Only known from type material: Cuba and Yucatan Peninsula, Mexico.

Remarks. Anatoma atlantica ( Bandel, 1998) has distinct spiral lines on shoulder and base, and the in specimens with two teleoconch II whorls, the suture is closer than the width of the selenizone from the selenizone of the previous whorl. Anatoma proxima ( Dall, 1927) (= A. americana Bandel, 1998 ) from the Caribbean has upright lamellae on shoulder and base, and more distinct spirals, and the protoconch has flocculent sculpture as well as a apertural varix. Anatoma alternatisculpta Geiger & McLean, 2010 , from the Caribbean has less than half the number of axial and fewer, but spiral lines are more distinct, and the base shows a distinct reticulate pattern. Anatoma aedonia ( Watson, 1886) from the Caribbean and the southwestern Atlantic ocean has a turreted overall profile and cancellate sculpture on shoulder and base. Anatoma alta ( Watson, 1886) from the tropical and subtropical northern Atlantic ocean has an overall more globular shell shape, much wider spaced axial cords on the shoulder (space between cords approximately 4–5 times width of cords), has coarse reticulate sculpture on the base, and is anomphalous.

Anatoma rolani shows a novel sculptural element, the dense appressed axial lamellae. They are unknown in any other described or undescribed species in Anatomidae or Scissurellidae (see Geiger 2008).

The recently described Anatoma plicatazona Geiger & McLean, 2010 , is based on two specimens from the Bahamas. The species is characterized by the keels of the selenizone being turned upwards. Additional specimens from Cuba [two specimens (coll. Fernández-Garcés), five specimens (MHNS: Fig. 1 B), both lots 40 m, Rancho Luna, Cienfuegos, Cuba, 22.017˚N, 80.430˚W] confirm the presence of this species in the Caribbean and extend its range by approximately 600 km.

Both of those new Caribbean Anatoma species seem to be genuinely rare. Only five out of 108 lots of Anatoma from the Caribbean belong to those two species (see Geiger 2008 for source of data). Anatomidae are approximately as well represented as Scissurellidae (130 lots).

Emilio Rolán provided SEM images of additional specimens imaged at CACTI of Vigo University, Spain. Two anonymous reviewers helped to improve the manuscript.

Figures

FIGURE 1. A. Anatoma rolani new species. Holotype. 35 m, Kittery beach, Guantanamo Bay, Oriente Province, Cuba, 19.883 ˚ N, 75.117 ˚ W (LACM 3120). Scale bar shell = 1 mm. Scale bar protoconch = 100 µm. B. Anatoma plicatazona Geiger & McLean, 2010. 40 m, Rancho Luna, Cienfuegos, Cuba, 22.017 ˚ N, 80.430 ˚ W (MHNS, images by E. Rolán). Scale bar = 1 mm.