New Zealand and Australian species of the genus Leptochiton (Mollusca Polyplacophora)
Author
Sirenko, Boris
text
Zootaxa
2020
2020-09-11
4851
3
401
449
journal article
8566
10.11646/zootaxa.4851.3.1
1420a882-3007-4d6f-afbc-f486390b2215
1175-5326
4407805
D5837E58-53D6-4C51-A5C0-C96A31F26BC4
Leptochiton inquinatus
(
Reeve, 1847
)
(
Figures 14–17
,
45D
)
Chiton inquinatus
Reeve 1847
: pl.
23 spec.
and fig. 154.
Lepidopleurus iredalei
Ashby 1921: 157
, pl. 8, figs. 3a–b; 1923: 217.
Terenochiton inquinatus
;
Iredale & Hull 1929: 76
, pl. 9, figs. 3–6;
Powell 1979: 22
, pl. 5, fig. 1.
Leptochiton (Leptochiton) inquinatus
;
Kaas & Van Belle 1985: 149
, fig. 67, map 27.
Leptochiton inquinatus
;
Marshall 1998
, 147.
Non:
Lepidopleurus inquinatus
;
Sykes 1896
, et auct. =
Leptochiton liratus
(H.
Adams & Angas, 1864
)
.
Type material.
Lectotype
and
2 paralectotypes
(
BMNH
42.11.7.99–102). Designated in
Kaas & Van Belle 1985
.
Type
locality.
Van Diemen’s Land
(in error, =
New Zealand
,
Auckland
Harbour
)
.
Material examined.
New Zealand
, N. coast of
South Island
,
Port
Nelson
, mid to low tide level, bottom of rocks embedded in slightly muddy sand, 6 spms (
ZISP 2383
), BL. 5.0–8.0 mm,
15.10.1971
, leg. J.
R
.
Penprase
;
North Island
, shelf
NE of Taiaroa Head
,
45°42’S
,
170°51’E
,
R
/
V
Munida
, stn 1975009, 44 m, 1 spm, BL 10.0 mm, (
NMNZ
M 328332
),
08.10.1975
;
North Island
, off
East Cape
,
Ranfurly Bank
,
37°35.80’S
,
178°52.70’E
,
R
/
V
Tangaroa
, stn 1979679, 49 m, 1 spm, BL
8.6 mm
, (
NMNZ
M 319789
),
17.01.1979
;
North Island
, off
East Cape
,
Ranfurly Bank
,
37°37.20’S
,
178°55.60’E
,
R
/
V
Tangaroa
, stn 1981839, 91–
93 m
, 1 spm, BL
3 mm
, (
NMNZ
M 319783
),
22.01.1981
;
North Island
, off
Rangaunu Bay
34°49.60’S
,
173°15.00’E
,
R
/
V
Tangaroa
, stn 1981871, 23 m, 1 spm, BL
8.5 mm
, (
NMNZ
M 281873
),
27.01.1981
;
North Island
, off
Spirits Bay
,
34°25.00’S
,
172°46.60’E
,
R
/
V
Tangaroa
, stn 1981916, 29 m, 1 spm, BL 13.0 mm, (
NMNZ
M 319791
),
03.02.1981
; SW of
Turakina
,
40°9.00’S
,
174°54.00’E
,
R
/
V
Acheron
, stn 1976485, 55–
57 m
, 19 spms, BL
5–8.5 mm
, (
NMNZ
M 319762
),
01.03.1976
;
Kapiti Channel
,
40°51.00’S
,
174°58.00’E
,
R
/
V
Acheron
, stn 1976482, 64 m, 1 spm, BL 12.0 mm, (
NMNZ
M 319776
),
01.03.1976
; off W side of
D’Urville Island
, between
Nile Head
&
Greville Harbor
,
40°47.00’S
,
173°48.00’E
,
R
/
V
Acheron
, stn 1976512, 62 m, 1 spm, BL
10 mm
, (
NMNZ
M 319761
),
05.03.1976
; off
East Cape
,
Ranfurly Bank
,
37°38.40’S
,
178°51.70’E
,
R
/
V
Tangaroa
, stn 1981840, 79-
83 m
, 1 spm, BL
5.5 mm
, (
NMNZ
M 095138
),
22.01.1981
;
Spirits Bay
34°23.50’S
172°47.90’E
, stn 1997013, 55 m, 1 spm, BL
13 mm
, (
NMNZ
M 137060
),
28.02.1997
;
Bare Island
,
Hawke Bay
, by diving,
6–10 m
, under rocks, 3 spms, BL 10.5–11.0 mm, 12/1984, leg.
M.H.B. O’Neill
;
Lyall Bay
,
Cook Strait
, low tide, under stones, 2 spms, BL 8.0–10.0 mm.
All
samples without registered numbers of the
NMNZ
are kept in the
ZISP
.
FIGURE 15.
Leptochiton inquinatus
, New Zealand, N. coast of South Island, Port Nelson, BL. 7.0 mm, (ZISP 2383).
A, B.
Dorsal and ventral scales and marginal spicules and needles;
C.
Dorsal scales and sutural needles;
D.
Dorsal scales.
FIGURE 16.
Leptochiton inquinatus
, New Zealand, N. coast of South Island, Port Nelson, BL. 7.0 mm, (ZISP 2383).
A.
Central portion of radula;
B.
Central and first lateral tooth of radula from anterior part.
FIGURE 17.
Leptochiton inquinatus
, New Zealand, N. coast of South Island, Port Nelson, BL. 7.0 mm, (ZISP 2383).
A.
Sutural needle;
B.
Dorsal scales;
C.
Marginal needle;
D.
Marginal spicule;
E.
Marginal scale;
F.
Ventral scale near margin;
G.
Ventral scale from mid-girdle;
H.
Central and first lateral teeth;
I, J.
Heads of major lateral teeth;
K.
Aesthete group in central area. Scale bar 100 μm (A–J).
Distribution.
Around
New Zealand
, from intertidal zone to
91 m
.
There is a report of the species from the early Miocene of
New Zealand
(
Beu & Maxwell 1990
).
Remarks.
Two specimens were studied under SEM: specimen with body length
10.5 mm
(
New Zealand
, Bare Island, Hawke Bay), and specimen with body length
5.5 mm
(NMNZ M 095138). Both specimens have 10 gills per side, the larger specimen with a 4.0 mm long radula, the smaller specimen has the radula
3.2 mm
long and 34 transverse rows of mature teeth. The species is characterized by having low, rounded valves, with about 60 longitudinal rows of granules in central areas of the intermediate valves and about 55 rows in the antemucronal area of the tail valve, radial rows of granules in other areas, 11–17 (depends on BL) aesthetes in each granule, wide, obtusely pointed dorsal girdle scales with 8–10 sharp and narrow ribs, central teeth of radula long and narrow with wide blade, major lateral teeth with bidentate sharply pointed cusps of which the inner denticle is much smaller than the outer one.