The Marine Fauna of New Zealand: Isopoda, Aegidae (Crustacea)

flattened antennule peduncle articles, and pereopodal
and uropodal details will separate those species from
A. antarctica.
Comparison of the type material of Aegiochus koltuni
(Kussakin, 967) reveals no differences from Aegiochus
antarctica. Kussakin ( 967) in describing A. koltuni made
no reference to A. antarctica, comparing only with the
rather more different Aega magnifica; A. koltuni is here
placed in synonymy with Aegiochus antarctica.
Nunomura (2005) recorded this species from 20°E
off Antarctica (western sector of the southern Indian
Ocean), and commented on a number of differences
from other, unspecified, descriptions. While the
identification is probably correct, unfortunately the
illustrations in Nunomura’s account are of insufficient
accuracy and detail to allow for comparison with material
at hand from the Ross Sea or with other figured
descriptions (e.g. Hodgson 9 0 or Brandt 99 ).
The original date of publication has been somewhat
confused, in part by Richardson’s ( 9 3) reluctance to
accept that she was not attributed authorship of the
new name published by Hodgson ( 9 0), and by the
repeated publication of the description as a new species.
Irrespectively, the correct name, and authority, is
Aegiochus antarctica (Hodgson, 9 0).
Wägele ( 990) documented the growth and reproductive
biology of this species in captivity.
distribution: A widespread and apparently common
species, with numerous records from the Weddell Sea,
the Ross Sea and subantarctic islands of the Southern
Ocean; the northerly records are at about 60° South; at
depths (present material) of 38– 300 m, with all but one
record less than 450 metres; Brandt ( 99 ) recorded a
maximum depth of 7 0 m.
Aegiochus glacialis (Tattersall, 92 ), comb. nov.
(Fig. 38)
Aega glacialis Tattersall, 1921: 211, pl. 4, figs 1–10.– Monod,
926: 5– Hale, 937: 9; 952: 28.– Kussakin, 967: 225;
1982: 74.– Brandt, 1991: 216, fig. 1, 4 (tel 2).
Aega (Ramphion) glacialis.– Brusca, 983: .
materiaL examined: All ross sea: ♀ (non-ovig. 36 mm),
7 °44. –88’S, 7 °44.00–43. 5’E, 5 February 2004,
429–454 m (NIWA 23697); ♀ (non-ovig. 37 mm), Hut
Point, McMurdo Sound, 30 January 960, 300 m (NIWA
23698). 2 ♂ (2 mm, ~ 8 mm head missing), McMurdo
Sound, RS 4 (NIWA 23699).
NIwA ‘old’ collections (specimens not measured):
SU 9*, 0 January 960, Dearborn loc. x, 35 m,
trap (NIWA 23700); , southeast of Cape Armitage,
*See comments concerning station data under ‘material
examined’ for A. antarctica, p. 23 .
2 9
McMurdo Sound, 77°5 .99’S, 66°43.23’E, 8 July 96 ,
Dearborn loc. 6 B, 27 –290 m, trap (NIWA 2370 );
2, southeast of Cape Armitage, McMurdo Sound,
77°5 .99’S, 66°43.23’E, 24 July 96 , Dearborn loc. 6 B,
27 –290 m, trap (NIWA 23702); , southeast of Cape
Armitage, McMurdo Sound, 77°5 .99’S, 66°43.23’E,
8 August 96 , 27 –290 m, Dearborn loc. 6 B, trap
(NIWA 23703); , 25 August 96 , Dearborn loc. 6 B,
trap (NIWA 23704); , 4 September 96 , Dearborn
loc. 6 D, trap (NIWA 23705); , 6 October 96 , Dearborn
loc. 6 B, trap (NIWA 23706); 2, 6 October 96 ,
Dearborn loc. 6 B, trap (NIWA 23707).
Also examined: ♂ (20 mm), Antarctica (Atlantic sector),
75° 5’S, 26° 4’W, 29 January 909, 500 m, EPOS3,
stn 229, GSN6, Petersen, Tendal & Schiøtte on RV
Polarstern (ZMUC unreg).
suppLementary desCription: Rostral point folded ventrally
and posteriorly. Eyes large, not medially united,
separated by about 9% width of head; each eye made
up of ~23 transverse rows of ommatidia, each row with
~ 2– 6 ommatidia; eye colour black. Pleon with pleonite
4 with posterolateral margins extending clearly
beyond posterior margin of pleonite 5; pleonite 5 with
posterolateral angles free, not overlapped by lateral
margins of pleonite 4. Pleotelson 0.9 times as long as
anterior width, dorsal surface with weak longitudinal
ridge; lateral margins weakly concave, smooth, posterior
margin with distinct short median point, with
0– 4 RS.
Antennule peduncle articles and 2 slender,
article 2 without distal lobe; flagellum extending
to pereonite 2. Antenna flagellum extending to middle
of pereonite 3.
Frontal lamina posterior margin free, downwardly
projecting, blade-like, wider than long, posterior
margin concave (weakly), anterior margin rounded,
posterior margin not abutting clypeus.
Maxillule with 4 or 5 terminal RS (one large, 3 or 4
slender). Maxilla lateral lobe with 3 RS. Maxilliped palp
article 2 with 3 RS (slender); article 3 with 3 recurved
RS (and 3 straight); article 4 with 4 hooked RS (and
mesial short slender seta); article 5 articulating with
article 4, longer than wide, sub-rectangular, with 6 RS
(3 long, serrate, curved and 2 short).
Pereopod 1 ischium inferior margin with 0 RS, superior
distal margin with RS; merus inferior margin
with 3 RS (and one simple seta), set as two groups (of 2
and ), superior distal angle with 0 RS; carpus inferior
margin with RS (and simple seta); propodus .9
times as long as proximal width, RS, propodal palm
with small distal lobe, dactylus smoothly curved, .2 as
long as propodus. Pereopod 2 ischium inferior margin
with 0 RS, superior distal margin with RS; merus
inferior margin with 4 RS (distal RS large, proximal
small), set as two groups, superior distal margin with