High cryptic diversity in the kleptoparasitic genus Hyalorisia Dall, 1889 (Littorinimorpha: Capulidae) with the description of nine new species from the Indo-West Pacific
Author
Fassio, Giulia
Author
Russini, Valeria
Author
Buge, Barbara
Author
Schiaparelli, Stefano
Author
Modica, Maria Vittoria
Author
Bouchet, Philippe
Author
Oliverio, Marco
text
Journal of Molluscan Studies
2020
Rijksuniversiteit te Gent. Fakulteit van de Landbouwkundige en Toegepaste Biologische Wetenschappen
2020-09-18
86
4
401
421
http://dx.doi.org/10.1093/mollus/eyaa028
journal article
8663
10.1093/mollus/eyaa028
613998a5-1f0e-46b2-9141-a0bce996b557
4464900
6DBF9C90-3CAA-49F3-A9ED-9611D073840F
Hyalorisia kely
Fassio, Bouchet & Oliverio
new species
MOTU-7 (
Figs 3G
,
5C
,
7F, O
)
Type material
:
Holotype
:
off Mahajanga, NW
Madagascar
,
MIRIKY, Stn CP3268
,
15°31 S
,
45°45 E
,
640–800 m
,
MNHN-IM-2007-39091
(
male
).
Material examined
: The
holotype
and other material (MNHN-IM-2007-38809 and MNHN-IM-2007-39041).
Etymology
: After the Malagasy adjective ‘kely’, meaning ‘little or small’, referring to the size of this species.
ZooBank registration
:
urn:lsid:zoobank.org:act:
73192B98-3CD7-4500-A250-DE3F2DF78C5C
.
COI-based diagnosis
: Five diagnostic (autapomorphic) positions in the alignment: 325(G), 448(C), 514(G), 580(G) and 634(C).
Shell (data for
holotype
shown within parentheses)
: Size small for the genus: length 4–6.5 (6.5) mm, width 2.5–4.5 (4.5) mm, height 1.5–2.5 (2.5) mm; thin, ellipsoidal, depressed; white shell surface with a smooth yellowish periostracum; anterior margin very slightly angled; protoconch of 0.8–1 (1) whorl, diameter of nucleus 0.19–0.21 (0.19) mm; teleoconch smooth except for distinct commarginal growth ridges; apertural margin thin, interior glossy white; lamella narrow to wide, width 0.34–0.8 (0.8) mm.
Soft parts (ethanol preserved)
: Cephalic tentacles completely whitish or grey at the base; pseudoproboscis whitish.
Radula
: Taenioglossate, 2-1-R-1-2; marginal teeth sickle shaped; internal marginals with few denticles on the inner edge; lateral teeth triangular, highly denticulated on outer edge, inner edge highly denticulated or presenting a single denticle; rachidian tooth triangular, highly denticulated on both edges.
Host
: The
holotype
was attached to
P. caducum
(MNHN-IM-2007-39095) (
Fig. 9B
).
Distribution
: So far known only from
Madagascar
and the
Mozambique
Channel, at depths of
357–
640 m
.
Remarks
:
Hyalorisia kely
n. sp.
was found off
Mahajanga
,
Madagascar
(MIRIKY: Stn CP3268). Here, it occurred sympatrically with
H. lehibe
n. sp.
(MOTU-5) and syntopically with
H. madagascarensis
n. sp.
(MOTU-10).