60
THE BIOLOGY O F EUPHAUSIIDS
middle area of the eastern central zone. It is present between about
40"N and 25"N and again between about 10's and 20"-30"s in the
eastern Pacific; its latitudinal range is much greater in the western
Pacific, being present throughout the whole area except between about
3"N and 8' s north and westwards from New Guinea. Indian: occurs
between 15'N and 40'5, found in the Gulf of Aden ; again a tendency
for it to live in areas of less than 4 000 m depth. Ponomareva (1968)
records it from the Red Sea. Lives a t approximately the same depths as
E. recurva, that is 140 to 700 m during the day, above 100 m a t night.
Length 10-15 mm. (Hansen, 1905b, 1915,1916; Tattersall, 1906, 1927,
1936c; Illig, 1930; Leavitt, 1935, 1938; Boden, 1954, 1961a; Lewis,
1954; Nepgen, 1957; Evans, 1961; Legar6, 1961; Brinton, 1962a;
Grice and Hart, 1962 ; Ponomareva, 1963, 1964, 1968 ; Baker, 1965.)
Euphausia brevis Hansen, 1905
E . brewis Hansen, 1905b: 15-16; 1912: 239-241, pl. viii, fig. 1, a-g; Boden
et al., 1955 : 328-330, fig. 21.
A widespread species occurring in all three oceans (Fig. 19).
Atlantic : found between about 50"N and 40"s. Legar6 found a damaged
specimen, which he identified as E. brevis, off Venezuela. It is rare in
the eastern Atlantic between about 20"N and 11"s but occurs throughout the Mediterranean except in the extreme eastern region. Pacific:
this species is biantitropical in the Pacific, occurring between 35"N and
10"N and again between about 8"s and 35"s. It is concentrated within
the centres of its two ranges of distribution unlike E. mutica and
E . recurva which tend to be concentrated round their periphery.
Indian : found between 9"N and 35"s. Ponomareva (1 968) records it
from the Red Sea. This species seems to occur in areas of depth less
than 4 000 m in the Atlantic and Indian Oceans. Occurs between 300
and 500 m depth during the day, above 100 m at night. Length 8.5 to
10 mm. (Hansen, 1905b, 1915, 1916 ; Tattersall, 1913, 1924, 1927,
1936c, 1939; Colosi, 1922b; Illig, 1930; Leavitt, 1935, 1938; Ruud,
1936; Gurney, 1947; Moore, 1949, 1950, 1952; Lebour, 1950; Boden,
1954, 1961a; Lewis, 1954; Dion and Nouvel, 1960; Bacescu and Mayer,
1961 ; Legark, 1961 ; Brinton, 1962a; Grice and Hart, 1962 ; Kinzer,
1963 ; Ponomareva, 1963, 1964, 1968 ; Baker, 1965; Casanova-Soulier,
196813.)
Euphausia diomedeae Ortmann, 1894
E . diomedeae Ortmann, 1894 : 102, pl. 1, fig. 3 ; Hansen, 1910 : 91-93, pl. xiii,
fig. 4, a-0 ; 1912 : 235, pl. vii, fig. 4a ; Boden et al., 1955 : 330-331, fig. 22. E. mutica
Hansen, 1905b : 14-15 (partim) ($de Hansen, 1910 : 91-93).
THE BIOLOGY O F EUPHAUSIIDS
middle area of the eastern central zone. It is present between about
40"N and 25"N and again between about 10's and 20"-30"s in the
eastern Pacific; its latitudinal range is much greater in the western
Pacific, being present throughout the whole area except between about
3"N and 8' s north and westwards from New Guinea. Indian: occurs
between 15'N and 40'5, found in the Gulf of Aden ; again a tendency
for it to live in areas of less than 4 000 m depth. Ponomareva (1968)
records it from the Red Sea. Lives a t approximately the same depths as
E. recurva, that is 140 to 700 m during the day, above 100 m a t night.
Length 10-15 mm. (Hansen, 1905b, 1915,1916; Tattersall, 1906, 1927,
1936c; Illig, 1930; Leavitt, 1935, 1938; Boden, 1954, 1961a; Lewis,
1954; Nepgen, 1957; Evans, 1961; Legar6, 1961; Brinton, 1962a;
Grice and Hart, 1962 ; Ponomareva, 1963, 1964, 1968 ; Baker, 1965.)
Euphausia brevis Hansen, 1905
E . brewis Hansen, 1905b: 15-16; 1912: 239-241, pl. viii, fig. 1, a-g; Boden
et al., 1955 : 328-330, fig. 21.
A widespread species occurring in all three oceans (Fig. 19).
Atlantic : found between about 50"N and 40"s. Legar6 found a damaged
specimen, which he identified as E. brevis, off Venezuela. It is rare in
the eastern Atlantic between about 20"N and 11"s but occurs throughout the Mediterranean except in the extreme eastern region. Pacific:
this species is biantitropical in the Pacific, occurring between 35"N and
10"N and again between about 8"s and 35"s. It is concentrated within
the centres of its two ranges of distribution unlike E. mutica and
E . recurva which tend to be concentrated round their periphery.
Indian : found between 9"N and 35"s. Ponomareva (1 968) records it
from the Red Sea. This species seems to occur in areas of depth less
than 4 000 m in the Atlantic and Indian Oceans. Occurs between 300
and 500 m depth during the day, above 100 m at night. Length 8.5 to
10 mm. (Hansen, 1905b, 1915, 1916 ; Tattersall, 1913, 1924, 1927,
1936c, 1939; Colosi, 1922b; Illig, 1930; Leavitt, 1935, 1938; Ruud,
1936; Gurney, 1947; Moore, 1949, 1950, 1952; Lebour, 1950; Boden,
1954, 1961a; Lewis, 1954; Dion and Nouvel, 1960; Bacescu and Mayer,
1961 ; Legark, 1961 ; Brinton, 1962a; Grice and Hart, 1962 ; Kinzer,
1963 ; Ponomareva, 1963, 1964, 1968 ; Baker, 1965; Casanova-Soulier,
196813.)
Euphausia diomedeae Ortmann, 1894
E . diomedeae Ortmann, 1894 : 102, pl. 1, fig. 3 ; Hansen, 1910 : 91-93, pl. xiii,
fig. 4, a-0 ; 1912 : 235, pl. vii, fig. 4a ; Boden et al., 1955 : 330-331, fig. 22. E. mutica
Hansen, 1905b : 14-15 (partim) ($de Hansen, 1910 : 91-93).