Memoirs of the Museum of Victoria 56( I ):255-259 (1997)
A NEW GRENADIER, GENUS TRACHONURUS, FROM NEW ZEALAND
AND AUSTRALIA (PISCES: GADIFORMES: MACROUR1DAE)
TOMIO IWAMOTO 1 AND PETER McMlLLAN'
'California Academy of Sciences, Golden Gate Park. San Francisco, California 941 IX, USA
MAK Fisheries. Greta Point, PO Box 297. Wellington. New Zealand
Abstract
Iwamoto, T. and McMillan, P., 1997. A new grenadier, genus Iraelioiiurus, from New Zeal-
and and Australia (Pisces: Gadiformcs: Maerouridac). Memoirs of the Museum ofVietoria
56: 255-259.
A new grenadier fish, Iraelioiiurus gagaies, is described from depths of 436-1 240 m off
New Zealand and Australia. The species is unusual in lacking a grooved lateral line, which
differentiates it from all other known species of the genus. An undescribed species from
Australia, however, also lacks a lateral line, but that species has much larger scales and
differs in a number of proportional measurements and its paler eolour.
Introduction
The generic relationships of Trachonurus has
recently been considered by Sazonov and
Shcherbachev (1985), and its worldwide distri-
bution by Shcherbachev et al. (1979). The latter
paper followed Marshall (1973) in treating the
five nominal species as synonyms of T. villosus
(Giinthcr, 1877). Studies by TI, however,
revealed that more than one of those five species
are probably valid, and several other undes-
cribed species are present. Here, a new species
from New Zealand and Australia without a
grooved lateral line is described.
Abbreviations and methods for making
counts and measurements generally follow Iwa-
moto (1970) and Iwamoto and Sazonov (1988).
Because the new species lacks a grooved lateral
line and has only widely spaced free neuromasts,
counts of scales above or below the "lateral line"
were not possible. Total scale-row counts along a
diagonal to the anal fin were useful and are used
for this species. Institutional abbreviations fol-
low Leviton ct al. ( 1 985) and Leviton and Gibbs
(1988).
Trachonurus Giinthcr
I racltonurus Giinther, 1887: 142 (as subgenus of
Maerurus; type species. Coryphaenoides villosus
Giinthcr. 1877).
See Marshall (1973: 619) and Sazonov and
Iwamoto (1992: 77) for descriptions of the
genus.
Trachonurus gagates sp. nov.
Figure I
Iraelioiiurus sp. B: Paulin ct al., 1989: 125 (in
key).
Material examined. Holotvpe: AMS 1.24059-009
(70.2 HL, 430+ TL): Australia. NSW. offNorah Head;
33"32'S, 15209'F: 978 m; 1983.
Paratypes: Australia, Qld. CSIRO III 157-01 (73.4
mm HL, 430+ mm TL); WNW of Marion Reef:
1851.1'S, I49"33'F; 599-591 m; FRV Soela stn S06-
85-39. CSIRO 1 1. 1 158-01 (70.0 HL. 41 2* TL): NW of
Marion Reef; I8°46.0'S. 150°32.I'E; 1188-1200 m:
FRV Soela stn S06-85-38: 25 Nov 1985.
NSW. AMS I.24355-OOI (53.6 HL. 352+ TL) and
CAS 82134 (2: 66.2-72.3 HL, 400+-400+ TL); off
Shoalhaven; 3454'S. 151 I78'E; 1150 m; 1983. AMS
1.24173-007 (3: 68.7-74.7 HL, 427+-47S+ TL): oil'
Shoalhaven Bight; 34°56'S. I 5 I "I 3'E: 1115 m; 26 Oct
1983. AMS 1.24356-007 (71 .7 HL. 425+ TL); 34°5 1 'S.
I5I°I5'E; 1043-1061 m; FRV Kapala stn K83-14-05:
26 Jan 1983.
Vic. AMS 1. 24 157-002 (76.0 HL. 450+ TL): off Cape
Evcrard; 38"17'S. I49°47'E; 1015 m; 1983. CSIRO
T538 (81.6 HL. 435+ TL): off Cape Martin: 3748'S.
I3933T.; 1007 m; 25 Apr 1983. CSIRO H. 2638-01
(49.5 HL. 305+ TL); SE of Portland; 38"53.8'S.
I42°00.3'F; FRV Soela stn S02-89-I I: 1989.
Tas. CSIRO H. 2640-01 (68.7 HL, 410+ TL); FRV
Soela stn S02-89-94; 1989. CSIRO H. 2634-03 (45.5
HL, 305 TL); SW of Macquane Harbour; 42"28.6'S.
I44"44.0'E; 1000 m; FRV Soela stn S02-89-85: 1989.
CSIRO H. 886-03 (71.0 HL. 430+ TL); E coast:
41"24.3'S, 14843. 7'E; 890-1052 m; FRV Soela stn
SO4-87-09; 1987. CSIRO T829 (69.3 HL. 400+ TL);
off Bicheno; 4L'48'S. 148°38'E: 1099 m: Challenger
stn 40/02; 21 Apr 1982. CSIRO T739 (60.6 HL. 342+
TL); off Cape Sorell; 4224'S, I44°4()'b; 1 130-1 150 m;
FV Margaret Phillipa stn 03/07; 22 Oct 1983.
SA. NMV A. 5880 (2: 54.9-59.4 HL, 334-381 TL):
38°3I.67'S. I40°43.9I'E; I 100 m. NMV A. 5882 (56.8
HL, 350 TL); 38°36.I'S. I40"58.9'E: 1080-1110 m:
FRV Soela stn SOIO-88-83: 8 Feb 1988. NMV
A. 8995 (75.3 HL. 393+ TL): 33°57.7'S, 13r'26.4'F;
1000-1030 m; FV Comet stn RP26; 19 Feb
1 990.
255
BioStor
