3. DISTRIBUTION AND SYNONYMY
95
found in the Mediterranean. Pacific : widespread between 40"N and
35'5. Indian : except for the Straits of Mozambique, it is not recorded
south of about 10"s nor north of about 10"N but Illig has one record
at 27'58% 91'40'E; Torelli records it as present in the Red Sea and
Ponomareva (1968) confirms its presence there. Probably lives between
50 and 300m during the day, moving towards the surface at night.
Length 10-12 mm. (Sars, 1885 ; Ortmann, 1893 ; Tattersall, 1912a,
1913, 1924, 1927, 1936c, 1939 ; Hansen, 1915, 1916 ; Illig, 1930 ; Torelli,
1934; Leavitt, 1935, 1938; Ruud, 1936; Moore, 1949; Lebour, 1950;
Boden, 1954; Lewis, 1954; Nepgen, 1957; Evans, 1961; LegarB, 1961;
Brinton, 1962a; Grice and Hart, 1962; Ponomareva, 1963, 1964, 1968.)
Stylocheiron afine Hansen, 19 10
S . afine Hansen, 1910: 118-120, pl. xvi, fig. 4, a-d; 1912: 278-279; Boden
et al., 1955: 382-383, fig. 49.
This species belongs to the "Stylocheiron longicorne group " of
species. The morphology of this species is variable but the geographical
distribution of the various forms has only been determined in the
Pacific (Fig. 33). Atlantic: it is present between 40"N and 40'8, but
more common in the eastern than western Atlantic ; it does not occur
in the Mediterranean. Indian : found north of about 30"s but mainly
north of 10"s in the Arabian Sea, Red Sea, and Gulfs of Aden and
Oman. Pacific: present between 30" to 40"N and 30"s but different
forms of this species have distinct distributions. (1) " Indo-Australian
Form "-present
from 40"N down the western regions to the East
Indies and North Australia. (2) " California Current Form "-occurs
in the very localized area of this current off Baja California.
(3) " East Equatorial Form "-found off Central America extending to
18OOW in the North Equatorial Current and Equatorial Countercurrent, and to about 140"W in the South Equatorial Current, and
again westwards t o about 135"w between latitudes 10"s to 15"s.
(4) " West Equatorial Form "-mainly
found between 15"N and 15"s
extending from the East Indies eastwards to about 1lO"W. (5) " Central
Form "-present in central areas of the Pacific between 35" to 40"N and
10" to 20"N in the North Pacific and between 10" to 30"s in the South
Pacific. Usually lives above 300 m depth. Length 7-8 mm. (Hansen,
1915, 1916; Illig, 1930; Torelli, 1934; Leavitt, 1935, 1938; Tattersall,
1936a, 1939; Boden, 1954, 1961a; Nepgen, 1957; Legark, 1961;
Brinton, 1962a; Grice and Hart, 1962; Ponomareva, 1963, 1964, 1968.)
49
95
found in the Mediterranean. Pacific : widespread between 40"N and
35'5. Indian : except for the Straits of Mozambique, it is not recorded
south of about 10"s nor north of about 10"N but Illig has one record
at 27'58% 91'40'E; Torelli records it as present in the Red Sea and
Ponomareva (1968) confirms its presence there. Probably lives between
50 and 300m during the day, moving towards the surface at night.
Length 10-12 mm. (Sars, 1885 ; Ortmann, 1893 ; Tattersall, 1912a,
1913, 1924, 1927, 1936c, 1939 ; Hansen, 1915, 1916 ; Illig, 1930 ; Torelli,
1934; Leavitt, 1935, 1938; Ruud, 1936; Moore, 1949; Lebour, 1950;
Boden, 1954; Lewis, 1954; Nepgen, 1957; Evans, 1961; LegarB, 1961;
Brinton, 1962a; Grice and Hart, 1962; Ponomareva, 1963, 1964, 1968.)
Stylocheiron afine Hansen, 19 10
S . afine Hansen, 1910: 118-120, pl. xvi, fig. 4, a-d; 1912: 278-279; Boden
et al., 1955: 382-383, fig. 49.
This species belongs to the "Stylocheiron longicorne group " of
species. The morphology of this species is variable but the geographical
distribution of the various forms has only been determined in the
Pacific (Fig. 33). Atlantic: it is present between 40"N and 40'8, but
more common in the eastern than western Atlantic ; it does not occur
in the Mediterranean. Indian : found north of about 30"s but mainly
north of 10"s in the Arabian Sea, Red Sea, and Gulfs of Aden and
Oman. Pacific: present between 30" to 40"N and 30"s but different
forms of this species have distinct distributions. (1) " Indo-Australian
Form "-present
from 40"N down the western regions to the East
Indies and North Australia. (2) " California Current Form "-occurs
in the very localized area of this current off Baja California.
(3) " East Equatorial Form "-found off Central America extending to
18OOW in the North Equatorial Current and Equatorial Countercurrent, and to about 140"W in the South Equatorial Current, and
again westwards t o about 135"w between latitudes 10"s to 15"s.
(4) " West Equatorial Form "-mainly
found between 15"N and 15"s
extending from the East Indies eastwards to about 1lO"W. (5) " Central
Form "-present in central areas of the Pacific between 35" to 40"N and
10" to 20"N in the North Pacific and between 10" to 30"s in the South
Pacific. Usually lives above 300 m depth. Length 7-8 mm. (Hansen,
1915, 1916; Illig, 1930; Torelli, 1934; Leavitt, 1935, 1938; Tattersall,
1936a, 1939; Boden, 1954, 1961a; Nepgen, 1957; Legark, 1961;
Brinton, 1962a; Grice and Hart, 1962; Ponomareva, 1963, 1964, 1968.)
49