74
TIIE BIOLOGY OR EUPIIAUSIIDS
Euphausia pseudogibba Ortmann, 1893
E. pseudogibba Ortmann, 1893: 12, taf. 1, fig. 6 ; Hansen, 1910: 97-99,
pl. xvi, fig. 4, a-0; Boden et al., 1955: 340-342, fig. 28.
E. pseudogibba occurs in the Atlantic, Pacific and Indian Oceans
(Fig. 23). It belongs to the " E . gibba group " of species. Atlantic:
recorded between 35"N and 40"N in the northwest, the only other record
in the Western Atlantic being off Venezuela. All other records are
between 32"N and 37"s in the Eastern Atlantic ; it does not occur in
the Mediterranean. Pacific : occurs south and west of Japan and in the
Kuroshio Extension, the South China Sea, and the East Indian
Archipelago southeastwards to the Great Barrier Reef; it is also found
in mid-ocean in the area 12"s to 18"S, 108"W to 155"W. Indian : found
north of about 30"s but the records are scattered; it is a dominant
species in the Arabian Sea. Probably lives between 280 and 500m
during the day, rising towards the surface a t night. Length 12-14 mm.
(Hansen, 1905a, 1916 ; Tattersall, 1913, 1939 ; Illig, 1930 ; Leavitt,
1935, 1938; Boden, 1954; Evans, 1961; LegarB, 1961; Brinton, 1962a;
Grice and Hart, 1962; Ponomareva, 1963, 1964; Baker, 1965.)
Euphausia paragibba Hansen, 1910
E. parugibba Hansen, 1910 : 100-101, pl. xiv, fig. 6, a-d ; Boden et ul., 1955 :
E . paragibba occurs in the Indian and Pacific Oceans but not in the
Atlantic (Fig. 23). It belongs to the " E . gibba group " of species.
Pacific : concentrated along the equator, mostly between 16O"E and
1lO"W. I n the east it extends to the Galapagos Islands and the offshore
regions of the Peru Current while in the west it occurs off the northeastern coasts of Sumatra. It is absent from the eastern equatorial
region between 7"N and 20"N but has been caught near 20"N between
Hawaii and Baja California. Indian: has been recorded in the Gulf
of Aden and Bay of Bengal extending southwards to about 30"s in the
eastern ocean. Boden records it off the western coast of South Africa ;
all other records are north of the Straits of Mozambique. Probably
lives between 280 and 700 m depth during the day, above 140 m at
night. Length 12-16 mm. (Illig, 1930; Tattersall, 1939; Boden, 1954;
Brinton, 1962a; Ponomareva, 1963, 1964; Baker, 1965; Roger, 1967b.)
Euphausia hemigibba Hansen, 19 10
339-340, fig. 27.
E. hemigibba Hansen, 1910: 100, pl. xiv, fig. 5, a-f; Boden et al., 1955: 342344, fig. 29.
E . hemigibba occurs in the Atlantic, Pacific and Indian Oceans
(Fig. 23) and belongs t o the " E . gibba group I f of species. Atlantic:
TIIE BIOLOGY OR EUPIIAUSIIDS
Euphausia pseudogibba Ortmann, 1893
E. pseudogibba Ortmann, 1893: 12, taf. 1, fig. 6 ; Hansen, 1910: 97-99,
pl. xvi, fig. 4, a-0; Boden et al., 1955: 340-342, fig. 28.
E. pseudogibba occurs in the Atlantic, Pacific and Indian Oceans
(Fig. 23). It belongs to the " E . gibba group " of species. Atlantic:
recorded between 35"N and 40"N in the northwest, the only other record
in the Western Atlantic being off Venezuela. All other records are
between 32"N and 37"s in the Eastern Atlantic ; it does not occur in
the Mediterranean. Pacific : occurs south and west of Japan and in the
Kuroshio Extension, the South China Sea, and the East Indian
Archipelago southeastwards to the Great Barrier Reef; it is also found
in mid-ocean in the area 12"s to 18"S, 108"W to 155"W. Indian : found
north of about 30"s but the records are scattered; it is a dominant
species in the Arabian Sea. Probably lives between 280 and 500m
during the day, rising towards the surface a t night. Length 12-14 mm.
(Hansen, 1905a, 1916 ; Tattersall, 1913, 1939 ; Illig, 1930 ; Leavitt,
1935, 1938; Boden, 1954; Evans, 1961; LegarB, 1961; Brinton, 1962a;
Grice and Hart, 1962; Ponomareva, 1963, 1964; Baker, 1965.)
Euphausia paragibba Hansen, 1910
E. parugibba Hansen, 1910 : 100-101, pl. xiv, fig. 6, a-d ; Boden et ul., 1955 :
E . paragibba occurs in the Indian and Pacific Oceans but not in the
Atlantic (Fig. 23). It belongs to the " E . gibba group " of species.
Pacific : concentrated along the equator, mostly between 16O"E and
1lO"W. I n the east it extends to the Galapagos Islands and the offshore
regions of the Peru Current while in the west it occurs off the northeastern coasts of Sumatra. It is absent from the eastern equatorial
region between 7"N and 20"N but has been caught near 20"N between
Hawaii and Baja California. Indian: has been recorded in the Gulf
of Aden and Bay of Bengal extending southwards to about 30"s in the
eastern ocean. Boden records it off the western coast of South Africa ;
all other records are north of the Straits of Mozambique. Probably
lives between 280 and 700 m depth during the day, above 140 m at
night. Length 12-16 mm. (Illig, 1930; Tattersall, 1939; Boden, 1954;
Brinton, 1962a; Ponomareva, 1963, 1964; Baker, 1965; Roger, 1967b.)
Euphausia hemigibba Hansen, 19 10
339-340, fig. 27.
E. hemigibba Hansen, 1910: 100, pl. xiv, fig. 5, a-f; Boden et al., 1955: 342344, fig. 29.
E . hemigibba occurs in the Atlantic, Pacific and Indian Oceans
(Fig. 23) and belongs t o the " E . gibba group I f of species. Atlantic: