86: MYCTOPHIDAE (LANTERNFISHES)
DB-IS; A 20-21; P 14-16; GR (5-6)+(15-18); AO 14-16, in single series
but noticeably depressed behind A base. Mature males with single, supracaudalluminous gland; mature females with single, small, supracaudal
gland and 1-3 small, infracaudalluminous patches.
Attains 70 mm. High-oceanic, mesopelagic; from surface
and to 100 m at night. Not yet recorded in our area. Southern oceans as a convergence species.
86.46 Electrona paucirastra: 7 em SL.
86.47 Electrona risso
(Cocco, 1829)
Scopelus risso Cocco, 1829: 144 (Messina). Myctophum rissoi: Norman,
1930: 320. Electrona rissoi: Trunov, 1968: 745*; Nafpaktitis & Nafpaktitis, 1969: 10*; Hulley, 1972: 220; 1972: 240; Kotthaus, 1972: 13*;
Wisner, 1976: 30*; Gj~saeter, 1981: 220. Electrona risso: Hulley, 1981:
44*.
DB-IS; A 18-20; P 14-17; GR (7-8)+(16-20); AO 10-12, only slightly
depressed behind A base. Males with supracaudal or infracaudalluminous gland or both; females with one supracaudal and one infracaudal
luminous gland, occasionally with either supracaudal or infracaudal
luminous gland.
Attains 82 mm. High-oceanic, mesopelagic; 225 - 750 m
(day); 90 - 375 m and 450 - 550 m (night), exhibiting size
stratification with depth. Off east and west coasts in our
area. Widespread species in Atlantic (55°N-40 0 S), Mediterranean, Indian Ocean (OO-40 0 S), Tasman Sea and Cook
Strait, and eastern Pacific (42°N-20 0 S).
.""~'-.- ~-~\,
\
86.47 Eiectrona risso: 6.5 em SL.
86.48 Electrona subaspera
(GUnther, 1864)
Scopelus (Dasyscopelus) subasper Gunther, 1864: 411 (43°00'S,
123°00'E). Myctophum subasperum: Norman, 1930: 323 (in part). Electrona subaspera: Andriashev, 1962: 245 (in part); Hulley, 1981: 47*.
298
DB-IS; A 20-22; P 13-16; GR (7-9)+(18-22); AO 16-18, moderately
depressed posterior to A base. Mature males with 1-3 luminous scales
supracaudally, forming gland; mature females with supracaudal and
infracaudalluminous glands, variously arranged, occasionally with either
supracaudal or infracaudal gland.
Attains 127 mm. High-oceanic, mesopelagic; from surface to 200 m at night. Taken once in our area (40
0
S, 10
0
E).
Circumglobal between Subtropical Convergence and
Antarctic Polar Front.
86.48 Electrona subaspera: 5 em SL.
Genus Gonichthys Gistel, 1850
Anal fin base considerably longer than Dbase. Dn and
Vn present; 5 PO; 4 VO; SAO series forming obtuse angle;
AO series divided into AOa and AOp; 1 Pol. Mature males
with supracaudal gland only, consisting of separate or
slightly overlapping luminous structures bordered by black
pigment; mature females with series of non-overlapping
luminous patches infracaudally. Four species; probably 2 in
our area.
KEY TO SPECIES
la LL incomplete, with last perforated scale below
about origin of adipose fin; A origin behind
vertical through base of last Dray ............................... G. cocco
1 b LL complete, all scales perforated; A origin
slightly before vertical through base of last Dray .......... G. barnesi
86.49 Gonichthys barnesi
Whitley, 1943
Gonichthys barnesi Whitley, 1943: 174 (Lord Howe Id.); Hulley, 1981:
107*; 1984: 76. Myctophum cocco (non Cocco): Smith, SFSA No. 196*.
86.49 Gonichthys barnesi: 4 em SL.
~
-= c>-c:>a:c..~
o
0'
•
•
•
. . . .
.. , _
DB-IS; A 20-21; P 14-16; GR (5-6)+(15-18); AO 14-16, in single series
but noticeably depressed behind A base. Mature males with single, supracaudalluminous gland; mature females with single, small, supracaudal
gland and 1-3 small, infracaudalluminous patches.
Attains 70 mm. High-oceanic, mesopelagic; from surface
and to 100 m at night. Not yet recorded in our area. Southern oceans as a convergence species.
86.46 Electrona paucirastra: 7 em SL.
86.47 Electrona risso
(Cocco, 1829)
Scopelus risso Cocco, 1829: 144 (Messina). Myctophum rissoi: Norman,
1930: 320. Electrona rissoi: Trunov, 1968: 745*; Nafpaktitis & Nafpaktitis, 1969: 10*; Hulley, 1972: 220; 1972: 240; Kotthaus, 1972: 13*;
Wisner, 1976: 30*; Gj~saeter, 1981: 220. Electrona risso: Hulley, 1981:
44*.
DB-IS; A 18-20; P 14-17; GR (7-8)+(16-20); AO 10-12, only slightly
depressed behind A base. Males with supracaudal or infracaudalluminous gland or both; females with one supracaudal and one infracaudal
luminous gland, occasionally with either supracaudal or infracaudal
luminous gland.
Attains 82 mm. High-oceanic, mesopelagic; 225 - 750 m
(day); 90 - 375 m and 450 - 550 m (night), exhibiting size
stratification with depth. Off east and west coasts in our
area. Widespread species in Atlantic (55°N-40 0 S), Mediterranean, Indian Ocean (OO-40 0 S), Tasman Sea and Cook
Strait, and eastern Pacific (42°N-20 0 S).
.""~'-.- ~-~\,
\
86.47 Eiectrona risso: 6.5 em SL.
86.48 Electrona subaspera
(GUnther, 1864)
Scopelus (Dasyscopelus) subasper Gunther, 1864: 411 (43°00'S,
123°00'E). Myctophum subasperum: Norman, 1930: 323 (in part). Electrona subaspera: Andriashev, 1962: 245 (in part); Hulley, 1981: 47*.
298
DB-IS; A 20-22; P 13-16; GR (7-9)+(18-22); AO 16-18, moderately
depressed posterior to A base. Mature males with 1-3 luminous scales
supracaudally, forming gland; mature females with supracaudal and
infracaudalluminous glands, variously arranged, occasionally with either
supracaudal or infracaudal gland.
Attains 127 mm. High-oceanic, mesopelagic; from surface to 200 m at night. Taken once in our area (40
0
S, 10
0
E).
Circumglobal between Subtropical Convergence and
Antarctic Polar Front.
86.48 Electrona subaspera: 5 em SL.
Genus Gonichthys Gistel, 1850
Anal fin base considerably longer than Dbase. Dn and
Vn present; 5 PO; 4 VO; SAO series forming obtuse angle;
AO series divided into AOa and AOp; 1 Pol. Mature males
with supracaudal gland only, consisting of separate or
slightly overlapping luminous structures bordered by black
pigment; mature females with series of non-overlapping
luminous patches infracaudally. Four species; probably 2 in
our area.
KEY TO SPECIES
la LL incomplete, with last perforated scale below
about origin of adipose fin; A origin behind
vertical through base of last Dray ............................... G. cocco
1 b LL complete, all scales perforated; A origin
slightly before vertical through base of last Dray .......... G. barnesi
86.49 Gonichthys barnesi
Whitley, 1943
Gonichthys barnesi Whitley, 1943: 174 (Lord Howe Id.); Hulley, 1981:
107*; 1984: 76. Myctophum cocco (non Cocco): Smith, SFSA No. 196*.
86.49 Gonichthys barnesi: 4 em SL.
~
-= c>-c:>a:c..~
o
0'
•
•
•
. . . .
.. , _