Eight new species of Scissurellidae and Anatomidae (Mollusca: Gastropoda: Vetigastropoda) from around the world, with discussion of two new senior synonyms
Author
Geiger, Daniel L.
text
Zootaxa
2006
1128
1
33
journal article
50738
10.5281/zenodo.273358
ba17466e-c23e-4583-ae92-0bf956c83ca3
11755326
273358
Sinezona singeri
new species
:
Figure 14–16
Type
material
.
Holotype
SBMNH
359439, ex DLG 101.
Figure 14
A.
Paratype
SBMNH
359440, 1, ex DLG 101, from
type
locality.
Figure 14
B.
Type
locality
. Intertidal, Blue Hole, Dahab, Janub
Sina
,
Egypt
,
28.483°N
,
34.533°E
. Leg. B. Singer
Oct. 1990
.
FIGURE 14.
Sinezona singeri
new species
A. Holotype (SBMNH 359439). B. Paratype (SBMNH 359440). AB. Blue Hole, Dahab, Janub Sina, Egypt, 28.483°N, 34.533°E. C. LACM 8950. 03 m, Baye de Ranobe, near Mora Mora, N of Tulear, Toliara Province, Madagascar, 23.083°S, 43.500°E Specimen used for radula extraction. Scale bars shells = 500 µm. Scale bars protoconch = 100 µm.
Etymology
. Named for Benjamin (Solly) Singer, of Rehovot,
Israel
, the collector of the
type
material, for his continuing contributions to Red Sea malacology and in recognition of his service to the malacological community at large, particularly that of
Israel
.
Description
. Shell mediums size (
1.6 mm
=
holotype
,
paratype
), trochiform depressed. Protoconch of 0.75 whorls, smooth, apertural varix connected to embryonic cap, apertural margin deeply sinusoid. Teleoconch I of approximately 1.125 whorls, 12–13 distinct axial cords, interstices filled with fine irregular axials, no spirals. Teleoconch II of 1.33 whorls. Shoulder slightly convex, approximately 23–26 fine axials opn first whorl, approximately half as strong as axials on teleoconch I, interstices with finest growth lines; approximately a dozen somewhat irregularly spaced fine spirals forming barely noticeable points at intersection with axials. Base with strong constriction below selenizone, then inflated; 21–26 axials starting as thin thread on keels of selenizone, becoming strong elevated costae at periphery, thinning out to threads towards transition to umbilicus; approximately 20 finer spirals, becoming stronger from selenizone towards umbilicus, running over axials; no keels. Umbilicus open, wide, bordered by spiral cord towards base, walls smooth. Selenizone above periphery, keels moderately elevated, moderately strong, strong growth lamellae; foramen narrow treadropshaped, extending approximately 0.16 whorl. Aperture rounded, roof strongly overhanging.
FIGURE 15.
Paratypes of
Sinezona singeri
new species
. A. 170225 m, Reunion Island, 21.083°S, 55.200°E (MNHN). B. 13001480 m, Mayotte, E Bandele Reef, France, 12.933°S, 45.303°E (MNHN). 200500 m, Mayotte, E. Bandele Reef, France, 12.902°S, 45.252°E (MNHN). Scale bars shell = 1 mm. Scale bars protoconch = 100 µm.
FIGURE 16.
Radula of
Sinezona singeri
new species
. From LACM 8950. 03 m, Baye de Ranobe, near Mora Mora, N of Tulear, Toliara Province, Madagascar, 23.083°S, 43.500°E shown in Figure 14C. A. Anterior half of radular ribbon. Scale bar = 100 µm. B. Posterior half of radula ribbon. Scale bar = 100 µm. C. Full width of radula. Scale bar = 50 µm. D. Outer marginal teeth. Scale bar = 10 µm.
Radula rhipidoglossate. Rachidian tooth triangular, seven denticles on cusp, central one largest, parallel to radular ribbon. Lateral teeth 1–3 similar, three denticles on outer margin. Lateral tooth 4 reduced, hook shaped, with three minute points at cusp. Lateral tooth 5 broadened enlarged, approximately five denticles on inner margin. Radular interlock of central field moderate. Inner marginal teeth with spoon shaped cusp with three to four denticles on each side; outer marginals spoon shaped, with many fine denticles on cusp.
Differential diagnosis
.
Sukashitrochus dorbignyi
(Audouin, 1826)
and
Suk. tricarinatus
(Yaron, 1983) from the Red Sea share the closed foramen, but show distinct spiral keels on the base.
Scissurella rota
Yaron, 1983
from the Red Sea has an open slit, fewer spirals on the base that form pronounced hollow points at the intersection whith the axials, and has a protoconch with fine axial sculpture.
Scissurella reticulata
Philippi, 1853
and
Sci.
sudanica
Bandel, 1998
have an open slit, a less pronounced constriction below the selenizone, and a protoconch with fine axial sculpture. The species is superficially most similar to
Sci. hoernesi
Semper, 1865 from the IndoMalayan Archipelago, which however has an open slit and stronger axial sculpture on the shoulder that maintains its strength on teleoconch I and II.
Distribution
. Red Sea to Mascarene Islands, western Indian Ocean.
Specimen records
.
0–3 m
, Baye de Ranobe, near Mora Mora, N of Tulear, Toliara Province,
Madagascar
,
23.083°S
,
43.500°E
(LACM 89–50, 1).
Mayotte
, E. reef Bandele,
France
,
12.902°S
,
45.252°E
(MNHN, 4).
520–830 m
,
Mayotte
, E. Bandele reef,
France
,
12.897°S
,
45.270°E
(MNHN, 1).
1300–1480 m
,
Mayotte
, E. Bandele reef,
France
,
12.933°S
,
45.300°E
(MNHN, 1).
500 m
,
Mayotte
, E Bandele reef,
France
,
12.895°S
,
45.268°E
(MNHN, 3).
1300–1480 m
,
Mayotte
, E Bandele reef,
France
,
12.933°S
,
45.303°E
(MNHN, 1).
330–530 m
, Glorieuses, N. Ile du Lys,
11.440°S
,
47.372°E
(MNHN, 1).
170–225 m
,
Reunion
Island,
21.083°S
,
55.200°E
(MNHN, 4; MNHN, 2).