88
THE BIOLOQY OF EUPHAUSIIDS
but is absent, in the eastern Pacific, from the regions of the California
Current and westward of it; it is present along the equator between
1 l0"W and 140"W in the Eastern Equatorial Basin but absent south of
this in the area of the Peru Current and its western extension. Indian :
recorded off the African coast as far north as the Gulf of Aden and
westwards to the Bay of Bengal. There is a single record of Illig's at
about 30"s 90"E. Probably occurs between 200 and 700 m depth during
the day, rising towards the surface at night. Length 15-20 mm. (Sars,
1885; Ortmann, 1893 ; Hansen, 1905a, 1915, 1916; Tattersall, 1906,
1913, 1925, 1927, 1936c, 1939; Colosi, 1922a,b; Illig, 1930; Leavitt,
1935, 1938; Ruud, 1936; Gurney, 1947; Moore, 1949, 1952; Lebour,
1950; Boden, 1954, 1961a; Lewis, 1954; Nepgen, 1957; Legarh, 1961;
Brinton, 1962a ; Ponomareva, 1963, 1964 ; Roger, 1967b ; CasanovaSoulier, 1968b.)
Nematoscelis atlantica Hansen, 1910
N . atlantica Hansen, 1910: 106-110; Ruud, 1936: 11-14, figs. 3, 4, 16;
Boden et al., 1955 : 371-372, fig. 44.
This species lives in the Atlantic and Pacific Oceans but has not
been found in the Indian Ocean (Fig. 30). Atlantic: south of 40"N off
the American and European coasts ; there are no records of this species
in the central Atlantic Ocean but it is present in the Mediterranean
(often erroneously identified as N . microps) and southwards down the
African coast to 4 0 ' 5 . N . atlantica and N . microps are very difficult t o
distinguish from each other and so it is possible that this species is more
widespread in the Atlantic than is a t present supposed. Pacific: it
occupies the oceanic subtropical regions, being found between 13"N
and 40"N and again between about 13"s and 38"s. It lives below 150 m
depth during the day, frequently above it a t night. Length: males,
10.5-12 mm; females, 11-15 mm.
(Hansen, 1915; Colosi, 1922a;
Illig, 1930; Leavitt, 1935, 1938; Ruud, 1936; Lewis, 1954; Dion and
Nouvel, 1960 ; Brinton, 1962a ; Ponomareva, 1963 ; Soulier, 1963a,b;
Casanova-Soulier , 1968b .)
Nematoscelis lobata Hansen, 1916
N . Zobata Hansen, 1916 : 648-650, pl. Ixxxiii, fig. 2, a-f.
This species is closely related to N . microps and N . atlantica and
has only been found (Fig. 30) in the region of the Philippines at
13'43'30"N 121"E in large numbers a t 210 m depth and at 7'07'25"N
125'40'24"E at 33 m depth where two specimens were caught. (Hansen,
1916; Brinton, 1962a.)
THE BIOLOQY OF EUPHAUSIIDS
but is absent, in the eastern Pacific, from the regions of the California
Current and westward of it; it is present along the equator between
1 l0"W and 140"W in the Eastern Equatorial Basin but absent south of
this in the area of the Peru Current and its western extension. Indian :
recorded off the African coast as far north as the Gulf of Aden and
westwards to the Bay of Bengal. There is a single record of Illig's at
about 30"s 90"E. Probably occurs between 200 and 700 m depth during
the day, rising towards the surface at night. Length 15-20 mm. (Sars,
1885; Ortmann, 1893 ; Hansen, 1905a, 1915, 1916; Tattersall, 1906,
1913, 1925, 1927, 1936c, 1939; Colosi, 1922a,b; Illig, 1930; Leavitt,
1935, 1938; Ruud, 1936; Gurney, 1947; Moore, 1949, 1952; Lebour,
1950; Boden, 1954, 1961a; Lewis, 1954; Nepgen, 1957; Legarh, 1961;
Brinton, 1962a ; Ponomareva, 1963, 1964 ; Roger, 1967b ; CasanovaSoulier, 1968b.)
Nematoscelis atlantica Hansen, 1910
N . atlantica Hansen, 1910: 106-110; Ruud, 1936: 11-14, figs. 3, 4, 16;
Boden et al., 1955 : 371-372, fig. 44.
This species lives in the Atlantic and Pacific Oceans but has not
been found in the Indian Ocean (Fig. 30). Atlantic: south of 40"N off
the American and European coasts ; there are no records of this species
in the central Atlantic Ocean but it is present in the Mediterranean
(often erroneously identified as N . microps) and southwards down the
African coast to 4 0 ' 5 . N . atlantica and N . microps are very difficult t o
distinguish from each other and so it is possible that this species is more
widespread in the Atlantic than is a t present supposed. Pacific: it
occupies the oceanic subtropical regions, being found between 13"N
and 40"N and again between about 13"s and 38"s. It lives below 150 m
depth during the day, frequently above it a t night. Length: males,
10.5-12 mm; females, 11-15 mm.
(Hansen, 1915; Colosi, 1922a;
Illig, 1930; Leavitt, 1935, 1938; Ruud, 1936; Lewis, 1954; Dion and
Nouvel, 1960 ; Brinton, 1962a ; Ponomareva, 1963 ; Soulier, 1963a,b;
Casanova-Soulier , 1968b .)
Nematoscelis lobata Hansen, 1916
N . Zobata Hansen, 1916 : 648-650, pl. Ixxxiii, fig. 2, a-f.
This species is closely related to N . microps and N . atlantica and
has only been found (Fig. 30) in the region of the Philippines at
13'43'30"N 121"E in large numbers a t 210 m depth and at 7'07'25"N
125'40'24"E at 33 m depth where two specimens were caught. (Hansen,
1916; Brinton, 1962a.)