228: CHIASMODONTIDAE (SWALLOWERS)
Most captures have been at depths exceeding 750 m.
Tropical/subtropical in the 3 major oceans.
228.2 Chiasmodon niger: head (drawn after Norman, 1929); specimen found
dead on surface containing a fish larger than itself (after Goode & Bean,
1896).
Genus Dysalotus MacGilchrist, 1905
Two species, both presumed to occur off southern Africa.
KEY TO SPECIES
la Single row of emergent prickles above and below
LL; vomerine teeth present ................................ D. oligoscolus
la
~~~~ -,~"::.~.~.<:'~.<~
~
;;;~
'. .
lb
1 b More than 1 row of prickles above and below
LL; vomerine teeth lacking ............................. .. ...... . D. alcocki
228.3 Dysa/otus a/cocki: 22.5 cm type (after Norman, 1929).
228.4 Dysa/otus o/igosco/us: 13 cm holotype (after Johnson & Cohen, 1974).
732
228.3 Dysalotus alcocki
MacGilchrist, 1905
Dysalotus alcocki MacGilchrist, 1905: 268 (Bay of Bengal) ; Alcock &
MacGilchrist , 1905: PI. 37, Fig. I; Johnson & Cohen, 1974: 31 *.
D X-XI+26-28; A 1,26-28; P !l-13; vertebrae 39-40.
Majority of adults have been taken in depths exceeding
1 000 m; apparently no adults have been taken in hauls
restricted to the upper 700 m. Tropical/subtropical in the 3
major oceans; known from relatively few, widely-scattered
localities from Sargasso Sea to equatorial Pacific at
137°16'W. Has yet to be taken within our area due to
inadequate sampling.
228.4 Dysalotus o/igoscolus
Johnson & Cohen, 1974
Dysalotus oligoscolus Johnson & Cohen, 1974: 32, Fig. II. Dysalotus
alcocki (non MacGilchrist): Norman , 1929: 541 * (in part, specimen from
South Atlantic).
D X-XII+24-26; A 1,24-27; P !l-12; vertebrae 38-40.
All adults have been taken in depths exceeding 1 500 m.
Tropical/subtropical in the 3 major oceans; known from
relatively few, widely-scattered localities from South Atlantic to off Baja California. Not yet taken in our area , but very
wide distribution suggests that it probably does occur here .
Genus Ka/i Lloyd, 1909
Five species, all presumed to occur off southern Africa .
KEY TO SPECIES
la Segmented Drays 18-21 ............................ .. ............ .. .... ..... 2
Ib Segmented Drays 22-26 ......... .... ...... .. ....... ... .... ......... ......... 3
Most captures have been at depths exceeding 750 m.
Tropical/subtropical in the 3 major oceans.
228.2 Chiasmodon niger: head (drawn after Norman, 1929); specimen found
dead on surface containing a fish larger than itself (after Goode & Bean,
1896).
Genus Dysalotus MacGilchrist, 1905
Two species, both presumed to occur off southern Africa.
KEY TO SPECIES
la Single row of emergent prickles above and below
LL; vomerine teeth present ................................ D. oligoscolus
la
~~~~ -,~"::.~.~.<:'~.<~
~
;;;~
'. .
lb
1 b More than 1 row of prickles above and below
LL; vomerine teeth lacking ............................. .. ...... . D. alcocki
228.3 Dysa/otus a/cocki: 22.5 cm type (after Norman, 1929).
228.4 Dysa/otus o/igosco/us: 13 cm holotype (after Johnson & Cohen, 1974).
732
228.3 Dysalotus alcocki
MacGilchrist, 1905
Dysalotus alcocki MacGilchrist, 1905: 268 (Bay of Bengal) ; Alcock &
MacGilchrist , 1905: PI. 37, Fig. I; Johnson & Cohen, 1974: 31 *.
D X-XI+26-28; A 1,26-28; P !l-13; vertebrae 39-40.
Majority of adults have been taken in depths exceeding
1 000 m; apparently no adults have been taken in hauls
restricted to the upper 700 m. Tropical/subtropical in the 3
major oceans; known from relatively few, widely-scattered
localities from Sargasso Sea to equatorial Pacific at
137°16'W. Has yet to be taken within our area due to
inadequate sampling.
228.4 Dysalotus o/igoscolus
Johnson & Cohen, 1974
Dysalotus oligoscolus Johnson & Cohen, 1974: 32, Fig. II. Dysalotus
alcocki (non MacGilchrist): Norman , 1929: 541 * (in part, specimen from
South Atlantic).
D X-XII+24-26; A 1,24-27; P !l-12; vertebrae 38-40.
All adults have been taken in depths exceeding 1 500 m.
Tropical/subtropical in the 3 major oceans; known from
relatively few, widely-scattered localities from South Atlantic to off Baja California. Not yet taken in our area , but very
wide distribution suggests that it probably does occur here .
Genus Ka/i Lloyd, 1909
Five species, all presumed to occur off southern Africa .
KEY TO SPECIES
la Segmented Drays 18-21 ............................ .. ............ .. .... ..... 2
Ib Segmented Drays 22-26 ......... .... ...... .. ....... ... .... ......... ......... 3