65: PLATYTROCfIDAE (TUBESHOULDERS)
D 18-20; A 15-17; P 16-20; V 9. Supraorbitals not rigidly attached to
frontals. Two white bodies behind eye separated from each other by a distance greater than length of ventral body.
Attains 21 cm. Also known from northern Atlantic and
Pacific oceans. Mesopelagic.
65.2 Holtbyrnia laticauda
Sazonov, 1976
Holtbyrnia laticauda Sazonov, 1976: 17 (Tasman Sea); Sazonov &
Trunov, 1978: 88*.
D 19-21; A 15-17; P 16-20; V 9-10. Supraorbitals rigidly attached to
frontals. Two white bodies behind eye separated from each other by a distance less than length of ventral body.
Attains 30 cm. Distribution from eastern Atlantic to New
Zealand between 31° and 46°S. Mesopelagic.
65.2 Holtbyrnia laticauda: 12 em SL.
Genus Maulisia Parr, 1960
Four species; 2 in our area. Some records of M. mauli
from the South Atlantic and Indian oceans may be M. argipalla Matsui & Rosenblatt, 1979, which has the top of
head widest at the supraorbital and a round thoracic photophore . M. argipalla is known only from the North Atlantic
and eastern Pacific.
KEY TO SPECIES
la LL with papillae or unmarked; a large opening
several scale rows wide behind shoulder girdle;
photophores present ................................................ M. mauli
Ib About 50 enlarged modified scales in LL; no
opening several scale rows wide behind shoulder
girdle; photophores absent .................................. M. microlepis
65.3 Maulisia mauli
Parr, 1960
Maulisia mauli Parr , 1960: 82, Figs. 56-58 (Madeira); Sazonov &
Trunov, 1978: 95.
65.3 Maulisia mauli: 18 em SL.
224
D 17-22; A 15-19; P 17-20; V 7-9; 79-95 midlateral scale series; GR
(7-8)+(15-18) = 23-26. Thoracic photophore a short bar; top of head
widest at frontals.
Attains 20 cm. Atlantic and Indian oceans; mesopelagic
and bathypelagic.
65.4 Maulisia microlepis
Sazonov & Golovan, 1976
Maulisia microiepis Sazonov & Golovan, 1976: 10, Fig. 3 (off Namibia);
Sazonov & Trunov, 1978: 95; Pakhorukov, 1980: 23.
D 17-21; A 15-18; P 13-18; V 8-9; 112-125 midlateral scale series; GR
(8-9)+(20-23) = 29-3\.
Attains 25 cm. Off Namibia; also in North Atlantic.
Bathype\agic.
65.4 Maulisia microlepis: 22 .5 em SL.
Genus Normichthys Parr, 1951
Two species, 1 in our area. N. operosus Parr, 1951 has
been recorded from the eastern Atlantic at 18°S; it has
larger scales (80-100 midlateral scale series) than N.
yahganorum .
65.5 Normichthys yahganorum
Lavenberg, 1965
Normichthys yahganorum Lavenberg, 1965: 3 Figs. 1-2 (off Chile);
Sazonov & Trunov, 1978: 96*'
D 17-20; A 16-19; P 14-19; V 6-8; 100-125 midlateral scale series; GR
(6-8)+(17-21) = 24-28. Depth 3.4-4.0. Rudimentary photophores usually
present at V base and near anus.
Attains 16 cm. Circumglobal; distributed mostly between
30 0 S and 50 0 S, southernmost record 59°S. Bathypelagic.
65.5 Normichthys yahganorum: 16.5 em (after Sazonov & Trunov, 1978).
Genus Pellisolus Parr, 1951
Five species, 1 in our area. Sazonov & Trunov apparently included M. perforatus in Mentodus because of its
D 18-20; A 15-17; P 16-20; V 9. Supraorbitals not rigidly attached to
frontals. Two white bodies behind eye separated from each other by a distance greater than length of ventral body.
Attains 21 cm. Also known from northern Atlantic and
Pacific oceans. Mesopelagic.
65.2 Holtbyrnia laticauda
Sazonov, 1976
Holtbyrnia laticauda Sazonov, 1976: 17 (Tasman Sea); Sazonov &
Trunov, 1978: 88*.
D 19-21; A 15-17; P 16-20; V 9-10. Supraorbitals rigidly attached to
frontals. Two white bodies behind eye separated from each other by a distance less than length of ventral body.
Attains 30 cm. Distribution from eastern Atlantic to New
Zealand between 31° and 46°S. Mesopelagic.
65.2 Holtbyrnia laticauda: 12 em SL.
Genus Maulisia Parr, 1960
Four species; 2 in our area. Some records of M. mauli
from the South Atlantic and Indian oceans may be M. argipalla Matsui & Rosenblatt, 1979, which has the top of
head widest at the supraorbital and a round thoracic photophore . M. argipalla is known only from the North Atlantic
and eastern Pacific.
KEY TO SPECIES
la LL with papillae or unmarked; a large opening
several scale rows wide behind shoulder girdle;
photophores present ................................................ M. mauli
Ib About 50 enlarged modified scales in LL; no
opening several scale rows wide behind shoulder
girdle; photophores absent .................................. M. microlepis
65.3 Maulisia mauli
Parr, 1960
Maulisia mauli Parr , 1960: 82, Figs. 56-58 (Madeira); Sazonov &
Trunov, 1978: 95.
65.3 Maulisia mauli: 18 em SL.
224
D 17-22; A 15-19; P 17-20; V 7-9; 79-95 midlateral scale series; GR
(7-8)+(15-18) = 23-26. Thoracic photophore a short bar; top of head
widest at frontals.
Attains 20 cm. Atlantic and Indian oceans; mesopelagic
and bathypelagic.
65.4 Maulisia microlepis
Sazonov & Golovan, 1976
Maulisia microiepis Sazonov & Golovan, 1976: 10, Fig. 3 (off Namibia);
Sazonov & Trunov, 1978: 95; Pakhorukov, 1980: 23.
D 17-21; A 15-18; P 13-18; V 8-9; 112-125 midlateral scale series; GR
(8-9)+(20-23) = 29-3\.
Attains 25 cm. Off Namibia; also in North Atlantic.
Bathype\agic.
65.4 Maulisia microlepis: 22 .5 em SL.
Genus Normichthys Parr, 1951
Two species, 1 in our area. N. operosus Parr, 1951 has
been recorded from the eastern Atlantic at 18°S; it has
larger scales (80-100 midlateral scale series) than N.
yahganorum .
65.5 Normichthys yahganorum
Lavenberg, 1965
Normichthys yahganorum Lavenberg, 1965: 3 Figs. 1-2 (off Chile);
Sazonov & Trunov, 1978: 96*'
D 17-20; A 16-19; P 14-19; V 6-8; 100-125 midlateral scale series; GR
(6-8)+(17-21) = 24-28. Depth 3.4-4.0. Rudimentary photophores usually
present at V base and near anus.
Attains 16 cm. Circumglobal; distributed mostly between
30 0 S and 50 0 S, southernmost record 59°S. Bathypelagic.
65.5 Normichthys yahganorum: 16.5 em (after Sazonov & Trunov, 1978).
Genus Pellisolus Parr, 1951
Five species, 1 in our area. Sazonov & Trunov apparently included M. perforatus in Mentodus because of its