3.34 Scaphocalanus curtus
Farran 1926
Scolecithrix curta Farran, 1926: p. 259, pI. 7
figs. 1-3, 5, 6.
Scaphocalanus curtus Farran, 1929: p. 250Rose, 1933: p. 149, fig. 155 - Tanaka, 1961:
p. 183, fig. 124 - Park, 1970: p. 497, figs.
lO3-112 - Hure and Scotto di Carlo, 1968: p.
2, figs. 1, 2.
Scaphocalanus subcurtus Park, 1970: p. 499,
figs. 113-119 - Bjomberg, 1963: p. 41, fig.
22.
Body length -
females: 1.12-1.23mm (17 specimens)
Female. Body slender, ovoid. Cephalothorax
2.6 times longer than wide. Head fused with
first thoracic somite; last two thoracic somites
incompletely separated. Proportional lengths
of cephalothorax and abdomen 76: 24.
Posterior comers of thorax blunty angular in
dorsal and lateral views. A1 with transparent
strip along posterior edge, starting from third
segment. Proportional lengths of abdominal
somites and furca 34: 18 : 18 : lO : 20 = lOO.
Caudal rami twice as long as wide. Endopod
of P11-jointed and bearing 4 setae; Re2 with
four small spines on posterior surface. P5
absent.
Family Scolecithricidae
Remarks
This species was originally described by
Farran (1926) as Scolecithrix. In spite of the
absence of the P5, the same Author (Farran
1929) included this species in the genus
Scaphocalanus due to its affinities with this
genus. The specimens we recorded in the
Straits of Magellan concord in size range and
morphological details with those reported in
the literature. We did not record adult males.
Distribution
S. curtus is widely distributed in all ocean
areas. It has been reported from surface and
intermediate waters off New Zealand (Farran
1929) and deep waters of the Bay of Biscay
(Farran 1926) and Sagami Bay (Tanaka 1961).
Its presence has also been recorded in the
Caribbean Sea and Gulf of Mexico (Park
1970), the Gulf of Guinea (Vervoort 1965b)
and in the SW Atlantic, off Brazil (Bjomberg
1963). The species is very common in the Bay
of Naples and in the South Adriatic
(Mediterranean Sea) from lOO to 600m
(Hure and Scotto di Carlo 1968). In the
present study, S. curtus was sampled from
lOO-500m at only two stations in the Pacific
area of the Straits of Magellan.
Farran 1926
Scolecithrix curta Farran, 1926: p. 259, pI. 7
figs. 1-3, 5, 6.
Scaphocalanus curtus Farran, 1929: p. 250Rose, 1933: p. 149, fig. 155 - Tanaka, 1961:
p. 183, fig. 124 - Park, 1970: p. 497, figs.
lO3-112 - Hure and Scotto di Carlo, 1968: p.
2, figs. 1, 2.
Scaphocalanus subcurtus Park, 1970: p. 499,
figs. 113-119 - Bjomberg, 1963: p. 41, fig.
22.
Body length -
females: 1.12-1.23mm (17 specimens)
Female. Body slender, ovoid. Cephalothorax
2.6 times longer than wide. Head fused with
first thoracic somite; last two thoracic somites
incompletely separated. Proportional lengths
of cephalothorax and abdomen 76: 24.
Posterior comers of thorax blunty angular in
dorsal and lateral views. A1 with transparent
strip along posterior edge, starting from third
segment. Proportional lengths of abdominal
somites and furca 34: 18 : 18 : lO : 20 = lOO.
Caudal rami twice as long as wide. Endopod
of P11-jointed and bearing 4 setae; Re2 with
four small spines on posterior surface. P5
absent.
Family Scolecithricidae
Remarks
This species was originally described by
Farran (1926) as Scolecithrix. In spite of the
absence of the P5, the same Author (Farran
1929) included this species in the genus
Scaphocalanus due to its affinities with this
genus. The specimens we recorded in the
Straits of Magellan concord in size range and
morphological details with those reported in
the literature. We did not record adult males.
Distribution
S. curtus is widely distributed in all ocean
areas. It has been reported from surface and
intermediate waters off New Zealand (Farran
1929) and deep waters of the Bay of Biscay
(Farran 1926) and Sagami Bay (Tanaka 1961).
Its presence has also been recorded in the
Caribbean Sea and Gulf of Mexico (Park
1970), the Gulf of Guinea (Vervoort 1965b)
and in the SW Atlantic, off Brazil (Bjomberg
1963). The species is very common in the Bay
of Naples and in the South Adriatic
(Mediterranean Sea) from lOO to 600m
(Hure and Scotto di Carlo 1968). In the
present study, S. curtus was sampled from
lOO-500m at only two stations in the Pacific
area of the Straits of Magellan.