Terebra leptapsis Simone, 1999

Simone, Luiz Ricardo L. & Cunha, Carlo M., 2012, Taxonomic study on the molluscs collected in Marion-Dufresne expedition (MD 55) to SE Brazil: Xenophoridae, Cypraeoidea, mitriforms and Terebridae (Caenogastropoda), Zoosystema 34 (4), pp. 745-781: 776-778

publication ID

http://doi.org/ 10.5252/z2012n4a6

publication LSID

lsid:zoobank.org:pub:857CAD31-66E1-4CEE-AB4D-CCD64541D0EF

persistent identifier

http://treatment.plazi.org/id/03AA8317-C657-0D77-FF44-9909CFB70961

treatment provided by

Felipe

scientific name

Terebra leptapsis Simone, 1999
status

 

Terebra leptapsis Simone, 1999  

( Fig. 11 View FIG I-K)

Terebra leptapsis Simone, 1999: 229-233   , figs 7F, 12B, C, 13F, 14C, G, 21, 22; 2000: 138, 144-149. — Faber 2007: 50 (in synonymy), figs 10, 11. — Lima et al. 2007: 65. — Rosenberg 2009 (in synonymy). — Terryn 2011: 66.

Terebra leptaxis   – Faber 2007: 50 (error).

TYPE MATERIAL ( EXAMINED). — Holotype: Brazil, Rio de Janeiro, Campos Bay , c. 21°7’S, 40°53’W, MZSP 28704 View Materials ( Fig. 11 View FIG I-K) ( R / V Austrogagoupa). GoogleMaps  

Paratypes: same data as holotype, MZSP 28705, 1 specimen, MZSP 28706, 13 shells.

MATERIAL EXAMINED. — The same as Simone (1999: 229).

TYPE LOCALITY. — Brazil, Rio de Janeiro, Campos Bay, c. 21°7’S, 40°53’W ( R / V Austrogagoupa).

DISTRIBUTION. — Rio de Janeiro to São Paulo.

DESCRIPTION

See Simone (1999: 229-233).

MEASUREMENTS (in mm). — Holotype: 16.0 × 4.5.

HABITAT. — Sandy bottoms, 32-64 m depth.

Terebra doellojuradoi Carcelles, 1953   ( Fig. 11 View FIG E-H)

Terebra doello-juradoi Carcelles, 1953: 14   , 15, pl. 3, fig. 21.

Terebra doellojuradoi   – Scarabino 2004: 323, 234. — Faber 2007: 50 (in part). — Lima et al. 2007: 63. — Rosenberg 2009. — Terryn 2011: 66.

N.B.: all remaining citations for samples north from Uruguay almost certainly represent misidentifications and belong to other species of the complex, and, therefore, were excluded from this synonymic list.

TYPE MATERIAL ( EXAMINED). — Holotype: Uruguay, 35°53’S, 53°54’W, 61.88 m depth, MACN 23439 View Materials ( Fig. 11 View FIG E-G) GoogleMaps   . Paratypes: Uruguay, Mar del Plata , Banco de Mejillones, MACN 10319 View Materials , 1 View Materials shell   ; 35°53’S, 53°54’W, 61 m, MACN 24278 View Materials , 1 View Materials shell GoogleMaps   ; 36°25’S, 54°38’W, 54 m, MACN 23439 View Materials , 1 View Materials shell ( Fig. 11H View FIG ) GoogleMaps   .

TYPE LOCALITY. — Uruguay, 35°53’S, 53°54’W, 61.88 m depth.

DISTRIBUTION. — Uruguay to north Argentina.

DESCRIPTION

See Carcelles (1953: 14). Complement:

Shell: up to 20 mm, width c. ¼ of length, spire angle c. 20°. Colour uniform beige to pale brown ( Fig. 11E, G View FIG ). Protoconch pointed, smooth, of three whorls ( Fig. 11F View FIG ); width c. 14% of maximum teleoconch width; length c. 5% of shell length. Limit between protoconch and teleoconch distinct, orthocline ( Fig. 11F View FIG ). Teleoconch up to 10 whorls; profile weakly convex, suture clear but shallow. Sculpture of all teleoconch whorls with about same arrangement of threads. Except for increment of axial and spiral threads; c. 24 axial threads and c. 10 threads in penultimate whorl, axial threads slightly broader and spiral threads; spiral threads not uniform in size and distance from each other, but lying in a somewhat equidistant arrangement from each other, space between neighbouring axial threads about twice each thread width; interval between axial threads equivalent to their width. Sculpture of peri-umbilical area composed of 8-9 spiral liration along entire surface ( Fig. 11E View FIG ). Aperture somewhat prosocline, elliptic, about 1.5 longer than wide. Outer lip thick, simple. Inner lip with weak callus; parietal region in upper third, marked by abrupt curve in c. 90°; siphonal region marked by bright curve to left ( Fig. 11E View FIG ). Canal short, narrow, slightly curved to left.

MEASUREMENTS (in mm). — Holotype: 10.2 × 2.4; paratype MACN 24278: 8.5 × 2.2.

HABITAT. — “Rocky bottoms” (sic Carcelles 1953:14), 54-100 m depth.

DISCUSSION ON TEREBRIDS

Several aspects of the characters of the species belonging to the Terebra doellojuradoi   complex can be found elsewhere ( Simone 1999, 2000; Simone & Gracia 2006). The present paper was more focused on the four studied species, mainly concerning the MD55 collected specimens, and to the taxonomic problem related to T. leptapsis   .

Terebra leptapsis   has been considered a synonym of T. doellojuradoi   , in such the differences pointed out in the original description of the former ( Simone 1999) have been overlooked ( Faber 2007: 50; Rosenberg 2009). However, a closer look of the type specimens of T. doellojuradoi   deposited at MACN revealed additional characters which are incompatible with such interpretation.Two of T. doellojuradoi   types are shown in Figure 11 View FIG E-H ( Fig. 11 View FIG E-G: holotype; Fig. 11H View FIG : paratype) for a comparison with the holotype of T. leptapsis   ( Fig. 11 View FIG I-K). Terebra doellojuradoi   is smaller, with length around 18 mm (the holotype is 20.5 mm long), while T. leptapsis   specimens commonly are over 25 mm long. The sculpture of both species is quite variable, possessing some overlap of characters, but both holotypes are good specimens to show that T. doellojuradoi   normally bears more spiral threads than T. leptapsis   (compare penultimate whorl in Figure 11E and I View FIG ). The inverse happens with axial sculpture, in which T. leptapsis   tends to possess more axial threads (c. 30 in penultimate whorls) than T. doellojuradoi   (c. 20 in the same region). Regarding to the sculpture, both species are clearly closely related when compared to other species of the T. doellojuradoi   complex, e.g., T. crassireticula   ( Fig. 11L View FIG ) and others. The spire angle is also a quite different, T. doellojuradoi   has about 20°, while T. leptapsis   normally has 15-17°. The aperture is also informative, as T. doellojuradoi   has a somewhat shorter and slightly broader one than T. leptapsis   ( Fig. 11E, H, I View FIG ). However, the protoconch bears the solidest features for distinction of both species; that of T. doellojuradoi   is multispiral (about three whorls) ( Fig. 11F View FIG ) and proportionally narrower and smaller than the protoconch of T. leptapsis   , which is paucispiral (c. 1.5 whorl) ( Fig 11J View FIG ).

Based on these differences, it looks improbable that Terebra leptapsis   is a synonym of T. doellojuradoi   , and represents a distinct species. The former occurs from Uruguay to north Argentina, the latter occurs in southeastern Brazil. Besides, based on this study and on the endemicity of the species of the T. doellojuradoi   complex, the occurrence of T. doellojuradoi   in other regions is indeed questionable, such as Gulf of Mexico ( Bratcher & Cernohorsky 1987). Those reports have not been neither considered here.

The presence of a columellar callus or tooth in the inner lip has been regarded as appearing only in the maturity ( Faber 2007: 50). This is not accurate, as the columellar fold has been found running along columella in broken specimens (e.g., Terryn 2011: 65, fig. 5), which suggests its presence since immature phases. The columellar tooth is more common in northern species, and has been virtually absent in southern specimens, mainly those occurring in southeastern Brazil to north Argentina ( Figs 10C View FIG ; 11E, I View FIG ), including T. doellojuradoi   . Conversely, T. alagoensis   possesses a pair of teeth in the inner lip ( Fig. 11D View FIG ), which is a distinction of this species amongst the other species of the T. doellojuradoi   complex.

R

Departamento de Geologia, Universidad de Chile

V

Royal British Columbia Museum - Herbarium

MZSP

Sao Paulo, Museu de Zoologia da Universidade de Sao Paulo

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Neogastropoda

Family

Terebridae

Genus

Terebra

Loc

Terebra leptapsis Simone, 1999

Simone, Luiz Ricardo L. & Cunha, Carlo M. 2012
2012
Loc

Terebra leptaxis

FABER M. J. 2007: 50
2007
Loc

Terebra doellojuradoi

TERRYN Y. 2011: 66
FABER M. J. 2007: 50
LIMA S. F. B. & TENORIO D. O. & BARROS J. C. N. 2007: 63
SCARABINO F. 2004: 323
2004
Loc

Terebra leptapsis

TERRYN Y. 2011: 66
FABER M. J. 2007: 50
LIMA S. F. B. & TENORIO D. O. & BARROS J. C. N. 2007: 65
SIMONE L. R. L. 1999: 233
1999
Loc

Terebra doello-juradoi

CARCELLES A. R. 1953: 14
1953