72
THE BIOLOGY O F EUPHAUSIIDS
Euphausia gibboides Ortmann, 1893
E. gibboides Ortmann, 1893: 12, taf. I, fig. 5 ; Hansen, 1911: 33; 1912:
E. gibboides is closely related to E. fallax and E. sanzoi, the three
species being distinguished by small differences in the petasma of the
males. The distributional patterns of E. gibboides in the Atlantic and
Pacific are similar (Fig. 24). Atlantic: occurs between l0"N and 40"N
to 45"N in the west but follows the Canaries Current southwards in the
eastern Atlantic and has been recorded in the southeast as far south as
40"s. Pacific: occurs between 30"N and 40"N to 45"N in the west but
in the east is present in the California Current ; it seems to be absent in
the east between 20"N and l0"N but occurs again south of this and
extends westwards to the Galapagos Islands and southwards to about
35"s ; Roger (1967a) has extended its western limit at the equator to
148'07'W.
Indian : Brinton considers that Illig's and Tattersall's
records of this species in the Indian Ocean may in fact be of E. sanzoi
and that E . gibboides is absent from this ocean. Usually occurs between
280 and 700 m depth during the day, above 280 m at night. Length
22-27 mm. (Ortmann, 1893 ; Hansen, 1905a, 1915 ; Tattersall, 1913,
1925, 1927, 1936~) 1939; Illig, 1930; Leavitt, 1935, 1938; Ruud, 1936;
Lewis, 1954; Boden, 1961a; Legarb, 1961 ; Brinton, 1962a; Ponomareva,
1963, 1964; Roger, 1967a,b.)
252-255, pl. ix, fig. 2, a-h; Boden et al., 1955: 347-349, fig. 32.
Euphausia fallax Hansen, 191 6
E. fallax Hansen, 1916 : 645-646, pl. Ixxxiii, fig. 1, a-d. E. consuelae Boone,
1935 : 206-209, pls. 58-59 (fide Sheard, 1953 : 13).
This species has been recorded in the Philippine Archipelago (Fig.
24). Hansen recorded E . gibboides from the Fiji Islands and the South
China Sea and these records, according to Brinton, are more likely to
be of E . fallax than E. gibboides. (Hansen, 1916; Brinton, 1962a.)
Euphausia sanzoi Torelli, 1934
E. sanzoi Torelli, 1934 : 7-8, figs. 2-5.
This species was first described from the Red Sea (Fig. 24) but
Brinton thinks that Illig's and Tattersall's records of E . gibboides from
the Indian Ocean and Red Sea are in fact records of E. sanxoi. (Torelli,
1934 ; Illig, 1930 ; Tattersall, 1925, 1939 ; Brinton, 1962a ; Ponomareva,
1968.)
THE BIOLOGY O F EUPHAUSIIDS
Euphausia gibboides Ortmann, 1893
E. gibboides Ortmann, 1893: 12, taf. I, fig. 5 ; Hansen, 1911: 33; 1912:
E. gibboides is closely related to E. fallax and E. sanzoi, the three
species being distinguished by small differences in the petasma of the
males. The distributional patterns of E. gibboides in the Atlantic and
Pacific are similar (Fig. 24). Atlantic: occurs between l0"N and 40"N
to 45"N in the west but follows the Canaries Current southwards in the
eastern Atlantic and has been recorded in the southeast as far south as
40"s. Pacific: occurs between 30"N and 40"N to 45"N in the west but
in the east is present in the California Current ; it seems to be absent in
the east between 20"N and l0"N but occurs again south of this and
extends westwards to the Galapagos Islands and southwards to about
35"s ; Roger (1967a) has extended its western limit at the equator to
148'07'W.
Indian : Brinton considers that Illig's and Tattersall's
records of this species in the Indian Ocean may in fact be of E. sanzoi
and that E . gibboides is absent from this ocean. Usually occurs between
280 and 700 m depth during the day, above 280 m at night. Length
22-27 mm. (Ortmann, 1893 ; Hansen, 1905a, 1915 ; Tattersall, 1913,
1925, 1927, 1936~) 1939; Illig, 1930; Leavitt, 1935, 1938; Ruud, 1936;
Lewis, 1954; Boden, 1961a; Legarb, 1961 ; Brinton, 1962a; Ponomareva,
1963, 1964; Roger, 1967a,b.)
252-255, pl. ix, fig. 2, a-h; Boden et al., 1955: 347-349, fig. 32.
Euphausia fallax Hansen, 191 6
E. fallax Hansen, 1916 : 645-646, pl. Ixxxiii, fig. 1, a-d. E. consuelae Boone,
1935 : 206-209, pls. 58-59 (fide Sheard, 1953 : 13).
This species has been recorded in the Philippine Archipelago (Fig.
24). Hansen recorded E . gibboides from the Fiji Islands and the South
China Sea and these records, according to Brinton, are more likely to
be of E . fallax than E. gibboides. (Hansen, 1916; Brinton, 1962a.)
Euphausia sanzoi Torelli, 1934
E. sanzoi Torelli, 1934 : 7-8, figs. 2-5.
This species was first described from the Red Sea (Fig. 24) but
Brinton thinks that Illig's and Tattersall's records of E . gibboides from
the Indian Ocean and Red Sea are in fact records of E. sanxoi. (Torelli,
1934 ; Illig, 1930 ; Tattersall, 1925, 1939 ; Brinton, 1962a ; Ponomareva,
1968.)