Five new species of Turbonilla Risso, 1826 (Gastropoda, Heterobranchia, Pyramidellidae) found off the northeast coast of Brazil º 13 º
Author
S
Author
Absalão, Ricardo Silva
Author
Santos, Franklin Noel
Author
Oliveira, Deusinete
text
Zootaxa
2003
235
1
11
journal article
51313
10.5281/zenodo.156627
7372a5ed-10c7-4052-b231-a4d58c976648
11755326
156627
Turbonilla kamayura
n. sp.
(
Fig. 810
)
Description: Shell small, slightly conical to subcylindrical; semitransparent. Teleoconch whorls strictly convex. Suture shallow, oblique. Protoconch heterostrophic helicoidal; diameter
222 m
in
holotype
. With 10 teleoconch whorls. Axial ribs straight and orthocline; about
16 in
first whorl of teleoconch, decreasing to
1012 in
remaining whorls and increasing to 14 on body whorl of
holotype
; interspaces about twice as wide as ribs, ending abruptly at periphery of last whorl. Spiral sculpture absent. Base rounded, smooth. Aperture rhomboid. Columella slightly concave, without fold. Outer lip thin. No umbilical fissure.
Dimensions:
Holotype
height 4.0 mm; width
0.9 mm
.
Type
material:
Holotype
IBUFRJ 12701.
Paratype
MORG 41056,
paratype
MNRJ 9824,
paratype
UFPE 4441,
paratype
IBUFRJ 12702,
paratype
ZMA Moll. 4.02.0 17,
paratype
ANSP 410303,
paratype
MNHN. All
paratypes
from
Ilha
de Itaparica, Praia do Despacho, Bahia State (
13º01’S
,
38º27’W
), F. Maestrati coll.,
19841989
. All lots with two specimens, except MNHN with 21.
Type
locality:
06º57’32”S
34º29’22”W
, #7 REVIZEE,
750 m
depth, Rv. “Natureza” coll., off Paraíba State, northeast coast of
Brazil
,
29/xi/2001
.
Distribution: Ranging from Pernambuco State (08ºS) and Bahia State (13ºS), Northeast Brazilian coast.
FIGURES 814. 810.
Turbonilla kamayura
n. sp.
, holotype (IBUFRJ 12701). 8: whole shell, length 4.0 mm; 9: base detail; 10: protoconch detail. Scale bar = 100 µm.
1114.
Turbonilla mermeroglaphyra
n. sp.
, holotype (MNRJ 9825). 11: whole shell, length 2.4 mm; 13: base detail; 14: protoconch detail; 12: paratype (IBUFRJ 12704), whole shell, length 2.8 mm. Scale bar = 100 µm.
Etymology: This species is named in honor of the
Kamayura
Indians, one of the indigenous peoples of
Brazil
. The name is employed as a noun in apposition.
Remarks: The most similar species to
T. kamayura
is
T. coomansi
van Aartsen, 1994 (
Clench & Turner, 1950
, pl. 49, fig. 11 named as
T. pusilla
C. B. Adams, 1850
) from
Jamaica
. Both have the same shell profile,
type
of protoconch, and axial ribs.
Turbonilla kamayura
reaches a larger size, i.e., a length of
4.8 mm
versus
3.5 mm
for
T. coomansi
.
Although both species have the same
type
of helicoidal protoconch (
type
AII), the protoconch of
T. kamayura
has about one whorl more than does the protoconch of
T. coomansi
.
The axial ribs in
T. kamayura
vary from orthocline to slightly opisthocline, while they are clearly opisthocline in
T. coomansi
. The main difference is in the interspaces between the axial ribs; in
T. kamayura
they are about twice as wide as the ribs while in
T. coomansi
they are equal to the width of the ribs.
Turbonilla enna
Bartsch
in
Dall, 1927
(Pimenta & Absalão in press: fig. 35 [
holotype
]) is also similar to
T. kamayura
but can be distinguished by its planispiral protoconch (
type
AI); in
T. kamayura
the protoconch is helicoidal (
type
AII). Moreover,
T. enna
is nearly subcylindrical while the shell profile of
T. kamayura
is slightly triangular.