86
THE BIOLOGY OF EUPHAUSIIDS
Abramova, 1959 ; Dion and Nouvel, 1960 ; Furnestin, 1960 ; Bacescu
andMayer, 1961 ; Brinton, 1962a; Soulier, 1963a,b; Fraser, 1961, 1964;
Kinzer, 1963 ; Zelikman, 1964; Grindley and Penrith, 1965; CasanovaSoulier, 1968b.)
Nematoscelis tenella G. 0. Sam, 1883
N . tenella G. 0. Sars, 1883b : 28-29 ; 1885 : 133-134, PI. xxv, figs. 5, 7 ; Hansen.
1910: 110-112, pl. xv, fig. 4, a-m; 1912: 263-264, pl. x, fig. 3, a-c; Boden et al.,
1955: 366-368, fig. 41. N. mantis Chun, 1896: 165.
This mesopelagic species is widely distributed in the Atlantic,
Pacific and Indian Oceans (Fig. 29). Atlantic: Illig recorded it off
northwest Scotland a t 59' 39" 8'49.5'W but all other records are
south of about 35"N ; there appears to be a gap in its distribution between
the equator and 30"s and it has not been found in the western South
Atlantic. Pacific : occurs south of 40"N except in the cooler part of the
California Current and its southward extension into the Eastern
Equatorial Basin ; it is also scarce in the region of the Peru Current. It
is present in the East China and South China Seas and in the East
Indian Archipelago. Indian : present in the Arabian Sea and has been
found in the Gulf of Aden ; except for the Straits of Mozambique and
one record near 30"s 90"E it is only present between about 12"N and
10"s. It probably lives above 300m depth during the day although
Ruud considers that it lives at greater depths. Length 15-21 mm.
(Sars, 1885 ; Hansen, 1905b, 1915, 1916 ; Tattersall, 1912a, 1927, 1936c,
1939; Illig, 1930; Leavitt, 1935, 1938; Ruud, 1936; Lebour, 1950;
Boden, 1954, 1961a; Lewis, 1954; Brinton, 1962a; Ponomareva, 1963,
1964; Grindley and Penrith, 1965; Roger, 1967b.)
Nematoscelis microps G. 0 . Sars, 1883
N . microps G. 0. Sars, 1883b : 28 ; 1885 : 131-133, pl. xxv, figs. 1-4 ; Hansen,
1910 : 107-109, pl. xv, fig. 2, a-k; 1912 : 259-261, pl. ix, fig. 4, a-d, pl. x, fig. 1,
a-b; Boden et al., 1955: 368-369, fig. 42. N. rostrata G. 0 . Sam, 188313: 29;
1885 : 135-136, 169-170, pl. xv, figs. 8-10, pl. xxxi, figs. 23-29.
N . microps is found in the Atlantic, Pacific and Indian Oceans
(Fig. 30). It is difficult to distinguish this species from N . atlantica
which was first recognized in 1910; consequently, some of the early
records, as well as later ones, ascribed to N . microps are probably
actually of N . atlantica. Atlantic: it has been found as far north as
northwest Scotland but normally occurs between about 40"N and 40"s ;
it is only rarely present in the Mediterranean (Bacescu and Mayer,
1961) and is not common as is suggested by records in the literature.
Pacific: found between about 40"N and 40"s in the western Pacific
THE BIOLOGY OF EUPHAUSIIDS
Abramova, 1959 ; Dion and Nouvel, 1960 ; Furnestin, 1960 ; Bacescu
andMayer, 1961 ; Brinton, 1962a; Soulier, 1963a,b; Fraser, 1961, 1964;
Kinzer, 1963 ; Zelikman, 1964; Grindley and Penrith, 1965; CasanovaSoulier, 1968b.)
Nematoscelis tenella G. 0. Sam, 1883
N . tenella G. 0. Sars, 1883b : 28-29 ; 1885 : 133-134, PI. xxv, figs. 5, 7 ; Hansen.
1910: 110-112, pl. xv, fig. 4, a-m; 1912: 263-264, pl. x, fig. 3, a-c; Boden et al.,
1955: 366-368, fig. 41. N. mantis Chun, 1896: 165.
This mesopelagic species is widely distributed in the Atlantic,
Pacific and Indian Oceans (Fig. 29). Atlantic: Illig recorded it off
northwest Scotland a t 59' 39" 8'49.5'W but all other records are
south of about 35"N ; there appears to be a gap in its distribution between
the equator and 30"s and it has not been found in the western South
Atlantic. Pacific : occurs south of 40"N except in the cooler part of the
California Current and its southward extension into the Eastern
Equatorial Basin ; it is also scarce in the region of the Peru Current. It
is present in the East China and South China Seas and in the East
Indian Archipelago. Indian : present in the Arabian Sea and has been
found in the Gulf of Aden ; except for the Straits of Mozambique and
one record near 30"s 90"E it is only present between about 12"N and
10"s. It probably lives above 300m depth during the day although
Ruud considers that it lives at greater depths. Length 15-21 mm.
(Sars, 1885 ; Hansen, 1905b, 1915, 1916 ; Tattersall, 1912a, 1927, 1936c,
1939; Illig, 1930; Leavitt, 1935, 1938; Ruud, 1936; Lebour, 1950;
Boden, 1954, 1961a; Lewis, 1954; Brinton, 1962a; Ponomareva, 1963,
1964; Grindley and Penrith, 1965; Roger, 1967b.)
Nematoscelis microps G. 0 . Sars, 1883
N . microps G. 0. Sars, 1883b : 28 ; 1885 : 131-133, pl. xxv, figs. 1-4 ; Hansen,
1910 : 107-109, pl. xv, fig. 2, a-k; 1912 : 259-261, pl. ix, fig. 4, a-d, pl. x, fig. 1,
a-b; Boden et al., 1955: 368-369, fig. 42. N. rostrata G. 0 . Sam, 188313: 29;
1885 : 135-136, 169-170, pl. xv, figs. 8-10, pl. xxxi, figs. 23-29.
N . microps is found in the Atlantic, Pacific and Indian Oceans
(Fig. 30). It is difficult to distinguish this species from N . atlantica
which was first recognized in 1910; consequently, some of the early
records, as well as later ones, ascribed to N . microps are probably
actually of N . atlantica. Atlantic: it has been found as far north as
northwest Scotland but normally occurs between about 40"N and 40"s ;
it is only rarely present in the Mediterranean (Bacescu and Mayer,
1961) and is not common as is suggested by records in the literature.
Pacific: found between about 40"N and 40"s in the western Pacific