102
THE BIOLOGY OF EUPHAUSIIDS
Boden, 1954; Lewis, 1954; Nepgen, 1957; Dion and Nouvel, 1960;
Bacescu and Mayer, 1961; Legark, 1961; Brinton, 1962a; Grice and
Hart, 1962 ; Kinzer, 1963 ; Ponomareva, 1963, 1964, 1968 ; Soulier,
1963a,b ; Grindley and Penrith, 1965 ; Roger, 1967b ; CasanovaSoulier, 1968b).
Stylocheiron maximum Hansen, 1908
S. maximum Hansen, 190th : 92 ; 1910 : 121-122, pl. xvi, fig. 6, a-d; Banner,
This mesopelagic species along with the related species S. abbreviaturn and S . robustum form the "Stylocheiron maximum group " of
species. It is found in the Atlantic, Pacific, and Indian Oceans (Fig. 36).
Atlantic : occurs commonly between about 45"N and 40"s but is sometimes found as far north as southern Greenland and Iceland ; has not
been recorded off South America south of 10"s. Pacific : present from
the Aleutian Islands to 50"s and even to 63"s ; the records are widely
scattered but it appears to be absent from the region between 10"N
and 20"N west of Central America. Indian : found off the African coast
and between 10"N and 10"s but not present in the Gulf of Aden and
Red Sea. Lives below 500 m depth. Length : males 20-25 mm, females
25-30 mm. (Hansen, 1908a, 1916; Tattersall, 1927, 1939; Denis, 1929;
Illig, 1930; Leavitt, 1935, 1938; Ruud, 1936; Einarsson, 1945; Boden,
1954; Lewis, 1954; Fraser, 1956, 1961; Nepgen, 1957; Dahl, 1961;
Brinton, 1962a; Ponomareva, 1963, 1964; Grindley and Penrith, 1965;
Roger, 1967b ; Casanova-Soulier, 1968b.)
1950 : 39-42, pl. iv, fig. 26, a-j ; Boden el al., 1955 : 391-393, fig. 55.
Stylocheiron robustum Brinton, 1962
S. robustum Brinton, 1962b : 17P178, figs. 4-5.
This mesopelagic species belongs to the "Stylocheiron maximurn
group " of species and is closely related to S. abbreviatum. It is confined
to the warmest parts of the Pacific Ocean, in areas with water temperatures greater than 14°C a t 200 m depth (Fig. 36). The only record of
this species outside the Pacific is a single individual taken off South
Africa at 32'05% 17'31%. Probably lives below 300 m, moving towards
the surface at night. Length 15-16 mm. (Brinton, 1962a,b.)
THE BIOLOGY OF EUPHAUSIIDS
Boden, 1954; Lewis, 1954; Nepgen, 1957; Dion and Nouvel, 1960;
Bacescu and Mayer, 1961; Legark, 1961; Brinton, 1962a; Grice and
Hart, 1962 ; Kinzer, 1963 ; Ponomareva, 1963, 1964, 1968 ; Soulier,
1963a,b ; Grindley and Penrith, 1965 ; Roger, 1967b ; CasanovaSoulier, 1968b).
Stylocheiron maximum Hansen, 1908
S. maximum Hansen, 190th : 92 ; 1910 : 121-122, pl. xvi, fig. 6, a-d; Banner,
This mesopelagic species along with the related species S. abbreviaturn and S . robustum form the "Stylocheiron maximum group " of
species. It is found in the Atlantic, Pacific, and Indian Oceans (Fig. 36).
Atlantic : occurs commonly between about 45"N and 40"s but is sometimes found as far north as southern Greenland and Iceland ; has not
been recorded off South America south of 10"s. Pacific : present from
the Aleutian Islands to 50"s and even to 63"s ; the records are widely
scattered but it appears to be absent from the region between 10"N
and 20"N west of Central America. Indian : found off the African coast
and between 10"N and 10"s but not present in the Gulf of Aden and
Red Sea. Lives below 500 m depth. Length : males 20-25 mm, females
25-30 mm. (Hansen, 1908a, 1916; Tattersall, 1927, 1939; Denis, 1929;
Illig, 1930; Leavitt, 1935, 1938; Ruud, 1936; Einarsson, 1945; Boden,
1954; Lewis, 1954; Fraser, 1956, 1961; Nepgen, 1957; Dahl, 1961;
Brinton, 1962a; Ponomareva, 1963, 1964; Grindley and Penrith, 1965;
Roger, 1967b ; Casanova-Soulier, 1968b.)
1950 : 39-42, pl. iv, fig. 26, a-j ; Boden el al., 1955 : 391-393, fig. 55.
Stylocheiron robustum Brinton, 1962
S. robustum Brinton, 1962b : 17P178, figs. 4-5.
This mesopelagic species belongs to the "Stylocheiron maximurn
group " of species and is closely related to S. abbreviatum. It is confined
to the warmest parts of the Pacific Ocean, in areas with water temperatures greater than 14°C a t 200 m depth (Fig. 36). The only record of
this species outside the Pacific is a single individual taken off South
Africa at 32'05% 17'31%. Probably lives below 300 m, moving towards
the surface at night. Length 15-16 mm. (Brinton, 1962a,b.)