3. DISTRIBUTION AND SYNONYMY
79
This is a neritic species (Fig. 26) occurring, along with T . raschii
(Fig. 27), another neritic species, in the coastal waters of the Gulf of
Alaska and, unlike T . raschii, in the offshore waters of the Gulf. It is
also found along the Californian coast and occasionally offshore between
about 40"N and 20"N. Nemoto has one record from 59"N 177"W in
the Bering Sea and Hansen has two records, both at about 55"N; it,
therefore, rarely occurs in the centre of the Bering Sea. Mostly present
above 100 m depth. Length 20-30 mm. (Hansen, 1915; Brinton,
1962a; Nemoto, 1962a; Ponomareva, 1963.)
Thysanozssa longipes Brandt, 1851
T . longipes Brandt, 1851 : 128, pl. vi, figs. 1-14 ; Hansen, 1911 : 38,40; Banner,
1950: 21-24; Boden et al., 1955: 352-354, fig. 34. T . armata Marukawa, 1928:
4, pl. ii, figs. 19-22. T . gregaria Hansen, 1915: 101.
Thysanozssa inspinata Nemoto, 1963
T . inspinata Nemoto, 1963a.
T. longipes is restricted to the southern part of the Bering Sea and
to the North Pacific (Fig. 26). Brinton defined the southern limit of
the " spined form " of this species as 40"N in the west and 50"N in the
Gulf of Alaska and the southern limit of the " spineless form " as 41°N
to 42"N. Nemoto (1963a) considers that the " spineless form " of
T . longipes is in fact a distinct species which he named T . inspinata.
Accepting this, T . longipes is distributed north of 40"N in the western
Pacific and north of 50"N in the Gulf of Alaska while T . inspinata
occurs southwards to 41"N to 42"N (Fig. 26). T . longipes has been
recorded northwards to about 62"N in the Bering Sea and Schmitt
found one specimen off Point Barrow. The northern limit of T . inspinata
may be the Aleutian Islands. They occur between 140 m and 280 m
depth during the day, approaching the surface a t night. T . longipes,
length 22-30 mm; T . inspinata, length 12-17 mm. (Hansen, 1915;
Schmitt, 1919 ; Nemoto, 1959, 1962a, 1963a; Brinton, 1962a; Ponomareva, 1963.)
Thysanoessa inermis (Kroyer, 1846)
Thysanopoda inermis Krcayer, 1846 : pl. vii, fig. 2 ; 1859 : 294-295, pl. v, fig. 24.
T. neglecta Krcayer, 1846 : pl. vii, fig. 3 ; Hansen, 1887a : 54. Thysanoessa aberdonensis Sim, 1872: pl. v, figs. 1-8. Euphausia inermis 0. 0. Rars, 1883a:
51, tab. 1, fig. 15. Thysanoessa borealis G. 0. Sars, 1883a: 53, tab. 1, figs. 16-18;
Boreophausia inermis G. 0. Sars, 1886 : 13 ; Hansen, 188713 : 253, pl. xxiii, fig. 3.
Rhoda inermis Sim, 1872 : 186 ; Stebbing, 1893 : 263 ; Zimmer, 1904 : 420, figs. 6-9.
79
This is a neritic species (Fig. 26) occurring, along with T . raschii
(Fig. 27), another neritic species, in the coastal waters of the Gulf of
Alaska and, unlike T . raschii, in the offshore waters of the Gulf. It is
also found along the Californian coast and occasionally offshore between
about 40"N and 20"N. Nemoto has one record from 59"N 177"W in
the Bering Sea and Hansen has two records, both at about 55"N; it,
therefore, rarely occurs in the centre of the Bering Sea. Mostly present
above 100 m depth. Length 20-30 mm. (Hansen, 1915; Brinton,
1962a; Nemoto, 1962a; Ponomareva, 1963.)
Thysanozssa longipes Brandt, 1851
T . longipes Brandt, 1851 : 128, pl. vi, figs. 1-14 ; Hansen, 1911 : 38,40; Banner,
1950: 21-24; Boden et al., 1955: 352-354, fig. 34. T . armata Marukawa, 1928:
4, pl. ii, figs. 19-22. T . gregaria Hansen, 1915: 101.
Thysanozssa inspinata Nemoto, 1963
T . inspinata Nemoto, 1963a.
T. longipes is restricted to the southern part of the Bering Sea and
to the North Pacific (Fig. 26). Brinton defined the southern limit of
the " spined form " of this species as 40"N in the west and 50"N in the
Gulf of Alaska and the southern limit of the " spineless form " as 41°N
to 42"N. Nemoto (1963a) considers that the " spineless form " of
T . longipes is in fact a distinct species which he named T . inspinata.
Accepting this, T . longipes is distributed north of 40"N in the western
Pacific and north of 50"N in the Gulf of Alaska while T . inspinata
occurs southwards to 41"N to 42"N (Fig. 26). T . longipes has been
recorded northwards to about 62"N in the Bering Sea and Schmitt
found one specimen off Point Barrow. The northern limit of T . inspinata
may be the Aleutian Islands. They occur between 140 m and 280 m
depth during the day, approaching the surface a t night. T . longipes,
length 22-30 mm; T . inspinata, length 12-17 mm. (Hansen, 1915;
Schmitt, 1919 ; Nemoto, 1959, 1962a, 1963a; Brinton, 1962a; Ponomareva, 1963.)
Thysanoessa inermis (Kroyer, 1846)
Thysanopoda inermis Krcayer, 1846 : pl. vii, fig. 2 ; 1859 : 294-295, pl. v, fig. 24.
T. neglecta Krcayer, 1846 : pl. vii, fig. 3 ; Hansen, 1887a : 54. Thysanoessa aberdonensis Sim, 1872: pl. v, figs. 1-8. Euphausia inermis 0. 0. Rars, 1883a:
51, tab. 1, fig. 15. Thysanoessa borealis G. 0. Sars, 1883a: 53, tab. 1, figs. 16-18;
Boreophausia inermis G. 0. Sars, 1886 : 13 ; Hansen, 188713 : 253, pl. xxiii, fig. 3.
Rhoda inermis Sim, 1872 : 186 ; Stebbing, 1893 : 263 ; Zimmer, 1904 : 420, figs. 6-9.