Three new species of Barleeidae (Mollusca, Gastropoda, Rissooidea) from Brazil
Author
Absalão, Ricardo Silva
text
Zootaxa
2002
56
1
7
journal article
51443
10.5281/zenodo.156075
69960e43-388c-4602-a5f1-7bd23ceb9df2
11755326
156075
Genus
Protobarleeia
Ponder, 1993
Type
species:
Amphithalamus myersi
Ladd, 1966
. Original designation.
Protobarleeia pyrrocincta
n.sp
.
Diagnosis: Shell minute,
1.60 mm
long, globose to elongateconic, with convex whorls. Protoconch with about 6 evenly spaced spiral cordlets. Teleoconch with about 8 very faint spiral threads on body whorl. Background creamcoloured, with reddish belts.
Description: Shell minute, length ranging from
1.55 to 1.66 mm
; width from
0.92 to 0.98 mm
. Solid, globose to elongateconic, with convex whorls. Background creamcoloured, with reddish belts. Teleococonch with about 8 very faint spiral threads on body whorl (not always visible). Suture well impressed. Protoconch paucispiral, with about 6 evenlyspaced spiral cordlets. Apical angle around 42°. Teleoconch base rounded, usually devoid of spiral sculpturing. Aperture holostomate, subangled posteriorly. Umbilical fissure usually present. Radula and operculum unknown.
Type
locality: Abrolhos Bank, off Bahia State,
Brazil
, about
20 m
.
Type
material:
Holotype
:
MNRJ
8622;
paratypes
: IBUFRJ 12038;
MNHN
;
ANSP
410286;
MORG
41054;
UERJ
2334;
MNRJ
8624
Etymology: From “
pyrro
” (Greek), red, and “
cincta
” (Latin), belt, referring to the reddish belts, the main diagnostic character of this new taxon.
Range: off Espirito Santo State, Southeastern
Brazil
.
Remarks: The diagnostic operculum of
Barleeidae
was not observed, since only dead shells were available. However, the new species fits easily into the concept of
Protobarleeia
Ponder (1983)
, in view of the faint spiral sculpture on the teleoconch and the spiral cordlets on the protoconch. No member of this genus has been reported previously from South American waters.
Barleeia rubroperculata
(Castellanos, 1972)
is the only species known from the region, but it is more slender than
P. pyrrocincta
n.sp.
and its protoconch is smooth, while the protoconch of
P. p y r ro c i n c t a
n.sp. is spirally corded. Incidentally, a smooth protoconch is not congruent with the concept of
Barleeia
proposed by Ponder (1983), but the generic placement of
B. rubroperculata
will not be discussed here. A fissural umbilicus may be present in some specimens, as also showed by
C. barcellosi
(
Absalão & Rios, 1995, p.89
).