Famelica leucospira, Abbate & V. & Lima & L. & Simone, 2022

Abbate, Daniel, V. Lima, Patricia Oristanio & L. Simone, Luiz Ricardo, 2022, The genera Famelica Bouchet & Warén, 1980 and Aliceia Dautzenberg & Fischer, 1897 (Conoidea Raphitomidae) collected by the MD 55 expedition in the Brazilian coast with descriptions of two new species, Zoosystema 44 (23), pp. 565-574 : 567

Famelica leucospira n. sp.

( Figs 2 ; 3 )

urn:lsid:zoobank.org:act:D3A93B13-5608-44EA-BAFA-D7CD98D202E2

Famelica mirmidina – Absalão et al. 2005: 35, figs 104, 116. — Figueira & Absalão 2012: 6, figs 3, 4 (non Dautzenberg & Fischer, 1896).

HOLOTYPE. — Brazil • Espírito Santo, Vitoria-Trindade Chain; St. DC70, Dredge Charcot-Picard; 18°59’S, 37°47’W; 1540-1550 m depth; MD55 ; Bouchet, Leal & Métivier col.; 26.V.1987; MNHN- IM-2000-38590 ( Fig. 2 A-C).

PARATYPES. — Brazil • 2 shells ( Figs 2 D-F; 3A, E-G); Espirito Santo; off Marataízes , sta. DS05; 21°26’S, 39°56’W; 1400-1420 m depth; 09. V.1987; MNHN-IM-2000-38591 • 1 shell ( Fig. 3B, C ); same data; MZSP 157441 • 1 shell; off Vitoria; Vitoria-Trindade Chain; Bouchet, Leal & Métivier col.; Expedition MD55 ; sta. DC72, 18°59’S, 37°47’W; 950-1050 m depth; MNHN-IM-2000-38592 • 1 shell; same data; 27. V.1987; MZSP 157439 ( Fig. 2 G-I) • 1 shell; 28. V.1987; sta. CB79 ; 19°02’S, 37°48’W; 1500-1575 m depth; MNHN-IM-2000-38593 • 2 shells; Rio de Janeiro; Bacia de Campos (Mapem Project); 21°08’13”S, 40°10’23”W; 902 m depth; MZSP 114454 • 1 shell 21°08’27”S, 40°10’26”W; same data; 902 m depth; MZSP 114479 • 6 shells; same data; sta. OPII#68 ; 12. VI.2003; 22°48’05”S, 40°06’38”W; 1972 m depth; IBUFRJ 18465 ( Fig. 3 H-K) .

TYPE LOCALITY. — Brazil, Espírito Santo, Vitoria-Trindade Chain, 18°59’S, 37°47’W, 1540-1550 m.

ETYMOLOGY. — The specific name is from the Latin leuco, an adjective that refers to the white colour; and spira, including the protoconch and the teleoconch of pure white colour.

DIAGNOSIS. — Shell c. 7 mm, spire angle 35-39°. Protoconch with low carina in inferior third mostly marked by axial nodes. Whorls weakly angled in superior third; sculpture lacking, except for very weak chevrons, showing past very shallow anal notch. Canal shorter than 10% of total length. Inner lip rounded, concave, lacking folds.

DISTRIBUTION. — Brazil: Bahia to Rio de Janeiro.

HABITAT. — Muddy and sandy bottoms, bathypelagic zone, 760- 3360 m.

DESCRIPTION

Shell ( Figs 2 ; 3 )

About 7 mm, fusiform, about twice as long as wide, with c. 7 convex whorls. Colour white to cream, sometimes with light orange spots throughout shell. Protoconch ( Figs 2C, F, I ; 3C, F, G, I ) with low carina in inferior third; consisting of two parts ( Fig. 3I ): 1) first part blunt, smooth, gradually with small pustules, dome-shaped, light brown, with 1.5 whorls; transition indistinct; 2) second part c. 1.5-2 whorls, cream, sculptured by vertical ribs near inferior suture, interconnected by narrow cord in carina level ( Fig. 3C, D ). Teleoconch smooth, lacking sculpture, fragile, possessing only shallow chevrons of growth lines almost imperceptible ( Figs 2B, E, G ; 3A, E, H ). Very shallow, weak angulation between middle and superior thirds ( Figs 2A, B, G ; 3E ). Suture deep, well-marked. Spire angle 35-40°. Aperture wide, elliptical, about 1.5 as long as wide; length about 1/4 of shell length ( Figs 2A, D, G ; 3A, B, E, H, J, K ). Siphonal canal short, narrow, simple; turned forward; about 10% of total shell length ( Figs 2A, G ; 3J, K ). Anal notch shallow, located between middle and superior thirds of outer lip (checked by growth lines) ( Figs 2B ; 3J, K ). Outer lip thin, fragile, rounded, smooth without sculpture or lirae ( Figs 2G ; 3J, K ). Inner lip similar arched as outer lip, weakly angled in middle ( Fig. 2A, G ). Callus very thin, almost absent, not folded. No umbilicus.

Measurements (length × width in mm) Holotype MNHN-IM-2000-38590: 5.1 by 2.2 ( Fig. 2A, B ). paratypes MNHN-IM-2000-38591: 6.8 by 3.9 ( Fig. 2D, E ); MZSP 157439: 4.6 by 1.9 ( Fig. 2G, H ).

Figures

FIG. 2. — Shells of Famelica leucospira n. sp. type specimens: A-C, holotype MNHN-IM-2000-38590 (L 5.1 mm), frontal view (A), dorsal view (B), detail of apical region (C); D-F, paratype MNHN-IM-2000-38591 (Sta. DS05) (L 4.6 mm), frontal view (D), dorsal view (E), detail of apical region (F); G-I, paratype MZSP 157439, (L 6.8 mm), frontal view (G), dorsal view (H), detail of apical region (I). Scale bars: C, F, I, 0.5 mm.

FIG. 3. — Shells of Famelica leucospira n. sp. type specimens in SEM: A, paratype MNHN-IM-2000-38591 sta. DS05, frontal-sightly apical view; B, paratype MZSP 157441,frontal-sightly apical view; C, same, detail of protoconch;D, same,detail of surface of protoconch third whorl; E, paratype MNHN-IM-2000-38591 sta. DS05, frontal view; F, same, detail of protoconch; G, same, partial apical view; H, paratype IBUFRJ 18465, frontal-sightly apical view; I, same, profile of protoconch, showing protoconch 1 and 2, and transition with teleoconch (3); J, K, two paratypes IBUFRJ 18465, frontal view. Scale bars: A, B, E, H, 0.5 mm; C, 200 µm; D, 50 µm; F, I, 100 µm; G, 200 µm; J, K, 1 mm. H, K, courtesy Cléo Oliveira, IBUFRJ.