100
THE BIOLOGY OF EUPHAUSIIDS
occurring in the Atlantic, Pacific and Indian Oceans (Fig. 35). There are
two morphological forms of this species-the " Short Form " and the
" Long Form ". The individual distributions of these forms are only
known in the Pacific. Atlantic: recorded between 65"N and 40"s but
most common between about 50"N and 40"X, present throughout the
Mediterranean but not in the Sea of Marmara. Indian: occurs north
of about 30"s throughout the Bay of Bengal and Arabian Sea and
extending into the Gulfs of Aden and Oman. Pacific: the " Short
Form " occurs in the northern and southern central regions of the ocean,
the northern and southern populations meeting in the central and
western equatorial regions. The " Long Form " is distributed beyond
the northern, eastern and southern limits of the distributional range of
the " Short Form " but is also present throughout the equatorial
regions of the eastern and western Pacific. Probably lives between 300
and 500 m depth. Length: males 6.5-9.5 mm, females up to 13 mm.
(Ortmann, 1893; Hansen, 1908a, 1916; Tattersall, 1911, 1912a, 1927,
1936c, 1939; Colosi, 1922b; Denis, 1929; Illig, 1930; Torelli, 1934;
Frost, 1935; Leavitt, 1935, 1938; Ruud, 1936; Einarsson, 1945;
Lebour, 1950; Fraser, 1950, 1961; Boden, 1954, 1961a; Lewis, 1955;
Nepgen, 1957 ; Dion and Nouvel, 1960 ; Furnestin, 1960 ; Bacescu and
Mayer, 1961; Dahl, 1961; Brinton, 1962a; Grice and Hart, 1962;
Kinzer, 1963 ; Ponomareva, 1963, 1964 ; Mauchline, 1965b ; CasanovaSoulier, 1968b).
Stylocheiron abbreviatum G. 0. Sars, 1883
S. abbrewiatum G. 0. Sam, 188313: 33; 1885: 147-149, pl. xxvii, figs. 11-13;
Hanson, 1910 : 121-123 ; 1912 : 280-283, pl. xi, fig. 5, a-f; Boden et al., 1955 :
390-391, fig. 54. S. cheEifer Chun, 1896 : lG2, taf. 1, figs. 1-8 ; Holt and Tattersall,
1905a: 110-112.
This species belongs to the "Stylocheiron m a x i m u m group " of
species and is found in the Atlantic, Pacific, and Indian Oceans (Fig. 36).
Atlantic : present between 40"N and 40"s but occasional individuals
have been caught off Iceland ; occurs throughout the Mediterranean but
not in the Sea of Marmara. Pacific: found between 40"N and 40"s
but absent from the colder parts of the California and Peru Currents
and in the eastern equatorial region between l0"N and 17"N. Indian:
present between 12"N and 30"S, in the Red Sea and Gulf of Aden, but
not in the northern Arabian Sea and Gulf of Oman. Lives between 75
and 300 m depth.
(Sars, 1885; Ortmann, 1893;
Hansen, 1905a, 1916; Holt and Tattersall, 1905b; Tattersall, 1911, 1924
1927, 1936c; Colosi, 192213; Lebour, 1926c, 1950; Denis, 1929; Illig,
1930; Torelli, 1934; Ruud, 1936; Leavitt, 1938; Legendre, 1940;
Length 15-16 mm.
THE BIOLOGY OF EUPHAUSIIDS
occurring in the Atlantic, Pacific and Indian Oceans (Fig. 35). There are
two morphological forms of this species-the " Short Form " and the
" Long Form ". The individual distributions of these forms are only
known in the Pacific. Atlantic: recorded between 65"N and 40"s but
most common between about 50"N and 40"X, present throughout the
Mediterranean but not in the Sea of Marmara. Indian: occurs north
of about 30"s throughout the Bay of Bengal and Arabian Sea and
extending into the Gulfs of Aden and Oman. Pacific: the " Short
Form " occurs in the northern and southern central regions of the ocean,
the northern and southern populations meeting in the central and
western equatorial regions. The " Long Form " is distributed beyond
the northern, eastern and southern limits of the distributional range of
the " Short Form " but is also present throughout the equatorial
regions of the eastern and western Pacific. Probably lives between 300
and 500 m depth. Length: males 6.5-9.5 mm, females up to 13 mm.
(Ortmann, 1893; Hansen, 1908a, 1916; Tattersall, 1911, 1912a, 1927,
1936c, 1939; Colosi, 1922b; Denis, 1929; Illig, 1930; Torelli, 1934;
Frost, 1935; Leavitt, 1935, 1938; Ruud, 1936; Einarsson, 1945;
Lebour, 1950; Fraser, 1950, 1961; Boden, 1954, 1961a; Lewis, 1955;
Nepgen, 1957 ; Dion and Nouvel, 1960 ; Furnestin, 1960 ; Bacescu and
Mayer, 1961; Dahl, 1961; Brinton, 1962a; Grice and Hart, 1962;
Kinzer, 1963 ; Ponomareva, 1963, 1964 ; Mauchline, 1965b ; CasanovaSoulier, 1968b).
Stylocheiron abbreviatum G. 0. Sars, 1883
S. abbrewiatum G. 0. Sam, 188313: 33; 1885: 147-149, pl. xxvii, figs. 11-13;
Hanson, 1910 : 121-123 ; 1912 : 280-283, pl. xi, fig. 5, a-f; Boden et al., 1955 :
390-391, fig. 54. S. cheEifer Chun, 1896 : lG2, taf. 1, figs. 1-8 ; Holt and Tattersall,
1905a: 110-112.
This species belongs to the "Stylocheiron m a x i m u m group " of
species and is found in the Atlantic, Pacific, and Indian Oceans (Fig. 36).
Atlantic : present between 40"N and 40"s but occasional individuals
have been caught off Iceland ; occurs throughout the Mediterranean but
not in the Sea of Marmara. Pacific: found between 40"N and 40"s
but absent from the colder parts of the California and Peru Currents
and in the eastern equatorial region between l0"N and 17"N. Indian:
present between 12"N and 30"S, in the Red Sea and Gulf of Aden, but
not in the northern Arabian Sea and Gulf of Oman. Lives between 75
and 300 m depth.
(Sars, 1885; Ortmann, 1893;
Hansen, 1905a, 1916; Holt and Tattersall, 1905b; Tattersall, 1911, 1924
1927, 1936c; Colosi, 192213; Lebour, 1926c, 1950; Denis, 1929; Illig,
1930; Torelli, 1934; Ruud, 1936; Leavitt, 1938; Legendre, 1940;
Length 15-16 mm.