96
THE BIOLOGY OF EUPHAUSIIDS
Stylocheiron suhmii G. 0. Sars, 1883
S. suhmii G. 0. Sam, 188313: 31-42; 1885: 142-144, pl. xxvii, figs. 1-4;
Hansen, 1912 : 271-278, pl. xi, fig. 3, a-b ; Boden et al., 1955 : 383-385, fig. 50.
S. mastigophorum Chun, 1896 : 144, pl. ix (partim).
This species belongs to the "Xtylocheiron Zongicorne group '' of
species and is present in the Atlantic, Pacific and Indian Oceans
(Fig. 34). Atlantic: found in the tropical regions between about 40"N
and 40"s but occasionally recorded farther northwards ; present
throughout the Mediterranean although relatively rare in the Ligurian
and Catalonian Seas. Pacific: present between 40"N and about 5" to
10"N in the North Pacific and again between 5" to 10"s and 35"s in the
South Pacific ; commonest in central Pacific regions. Indian : found
between 10"N and about 30"s and in the Red Sea and Gulf of Aden.
Probably lives a t about 300 m depth. Length 6-7 mm. (Sars, 1885;
Hansen, 190% ; Holt and Tattersall, 1905b ; Tattersall, 1912a, 1924,
1927, 1936c ; Colosi, 1922b ; Lebour, 1926c, 1950 ; Illig, 1930 ; Torelli,
1934; Leavitt, 1935, 1938; Ruud, 1936; Gurney, 1947; Moore, 1949;
Boden, 1954, 1961a; Lewis, 1954; Furnestin, 1960; Bacescu and
Mayer, 1961; Legark, 1961; Brinton, 1962a; Grice and Hart, 1962;
Kinzer, 1963 ; Ponomareva, 1963, 1964 ; Casanova-Soulier, 1968b.)
Xtylocheiron microphthalma Hansen, 1910
S. microphthalma Hansen, 1910: 117-118, pl. xvi, fig. 3, a-d; Boden et al.,
This species belongs to the "Stylocheiron longicorne group " of
species. It has been recorded twice from the Atlantic, a t 24"13'N
17"Ol'W by Illig and at 34'13" 12'16'W by Boden. All other records
are from the Pacific and Indian Oceans (Fig. 34). Pacific: it is more
common in the western tropical Pacific than in the eastern, occurring
between 40"N and 20"s in the west and between about 20"N and 20%
in the east. Indian : present between about l0"N and 10"s. The depth
a t which it occurs is not well known but probably above 700 m and on
occasion even above 280 m. Length 6-7 mm. (Tattersall, 1912a;
Hansen, 1916; Illig, 1930; Boden, 1961a; Brinton, 1962a; Ponomareva,
1963, 1964.)
1955: 385-386, fig. 51.
Xtylocheiron insulare Hansen, 1910
S. insdare Hansen, 1910: 115-117, pl. xvi, fig. 2, a-i.
This species belongs to the "Xtylocheiron longicorne group " of
species and lives in the East Indian Archipelago (Fig. 34). It has not
been found elsewhere except by Leavitt a t 36"50'N 69"lS'W to
THE BIOLOGY OF EUPHAUSIIDS
Stylocheiron suhmii G. 0. Sars, 1883
S. suhmii G. 0. Sam, 188313: 31-42; 1885: 142-144, pl. xxvii, figs. 1-4;
Hansen, 1912 : 271-278, pl. xi, fig. 3, a-b ; Boden et al., 1955 : 383-385, fig. 50.
S. mastigophorum Chun, 1896 : 144, pl. ix (partim).
This species belongs to the "Xtylocheiron Zongicorne group '' of
species and is present in the Atlantic, Pacific and Indian Oceans
(Fig. 34). Atlantic: found in the tropical regions between about 40"N
and 40"s but occasionally recorded farther northwards ; present
throughout the Mediterranean although relatively rare in the Ligurian
and Catalonian Seas. Pacific: present between 40"N and about 5" to
10"N in the North Pacific and again between 5" to 10"s and 35"s in the
South Pacific ; commonest in central Pacific regions. Indian : found
between 10"N and about 30"s and in the Red Sea and Gulf of Aden.
Probably lives a t about 300 m depth. Length 6-7 mm. (Sars, 1885;
Hansen, 190% ; Holt and Tattersall, 1905b ; Tattersall, 1912a, 1924,
1927, 1936c ; Colosi, 1922b ; Lebour, 1926c, 1950 ; Illig, 1930 ; Torelli,
1934; Leavitt, 1935, 1938; Ruud, 1936; Gurney, 1947; Moore, 1949;
Boden, 1954, 1961a; Lewis, 1954; Furnestin, 1960; Bacescu and
Mayer, 1961; Legark, 1961; Brinton, 1962a; Grice and Hart, 1962;
Kinzer, 1963 ; Ponomareva, 1963, 1964 ; Casanova-Soulier, 1968b.)
Xtylocheiron microphthalma Hansen, 1910
S. microphthalma Hansen, 1910: 117-118, pl. xvi, fig. 3, a-d; Boden et al.,
This species belongs to the "Stylocheiron longicorne group " of
species. It has been recorded twice from the Atlantic, a t 24"13'N
17"Ol'W by Illig and at 34'13" 12'16'W by Boden. All other records
are from the Pacific and Indian Oceans (Fig. 34). Pacific: it is more
common in the western tropical Pacific than in the eastern, occurring
between 40"N and 20"s in the west and between about 20"N and 20%
in the east. Indian : present between about l0"N and 10"s. The depth
a t which it occurs is not well known but probably above 700 m and on
occasion even above 280 m. Length 6-7 mm. (Tattersall, 1912a;
Hansen, 1916; Illig, 1930; Boden, 1961a; Brinton, 1962a; Ponomareva,
1963, 1964.)
1955: 385-386, fig. 51.
Xtylocheiron insulare Hansen, 1910
S. insdare Hansen, 1910: 115-117, pl. xvi, fig. 2, a-i.
This species belongs to the "Xtylocheiron longicorne group " of
species and lives in the East Indian Archipelago (Fig. 34). It has not
been found elsewhere except by Leavitt a t 36"50'N 69"lS'W to