REVIEW OF THE SYSTEMATICS AND ECOLOGY OF OCEANIC SQUIDS
225
1. Egea inermis Joubin, 1933
This is known only from the types which were collected at 33’51”
66”43’W with an open net fished to 50 m. The mantle length of the
largest is 4.4 cm.
TAONIINAE
Most of the generic names within this sub-family are of little value
and have been used indiscriminately in the past. In some cases a
generic term has been used to delineate a structural form which almost
certainly corresponds to a development stage. Thus, Bathothuuma,
Sandalops and Corynomma have all the features of young larval
taoniids as indicated by species in which a sufficiently good series of
sizes have been collected to determine the changes in form during
growth (Muus, 1956). These early larval features are, eyes on long
peduncles, very short arms, an elongation of the head anterior to the
eyes or “rostrum ” and a sac-like body with small terminal fins.
(Fig. 49). The species of the genera Taonidium and Teuthowenia have
eyes on rather shorter peduncles bet still have short arms and a
distinct rostrum although the latter is short in some species. Fusocranchia has sessile eyes and no rostrum but it also has minute arms, a
sac-like body and pedunculate fins. The species in Megalocranchia and
Helicocranchia have sessile eyes, relatively long arms and virtually
no rostrum. Throughout the series there is also a trend towards a
more elongate and pointed body with larger elongated fins; in the
genera Taonius, Phusmatopsis and Galiteuthis, which reach from 30 cm
to 1 m in mantle length, these trends are extended. I n Fig. 49 the
developmental trends are shown longitudinally and the genera have
been grouped transversely according to structural features which either
relate them to, or separate them from, other species of their own
“level” or of other “levels” of development. It is hoped that further
work on developmental series will connect up some of these “genera”.
In the light of the above remarks, it will be seen that the following
ecological details must be treated with extreme caution.
I. Sandabps
The members of the three species are all extremely small and have
early larval characters (Fig. 49).
1. Sandalops ecthambus Berry, 1920
The type and only specimen was taken north of Little Bahama
Bank in the North Atlantic at a depth of 0-100 m. It has a mantle
length of 2.2 cm.
K’
225
1. Egea inermis Joubin, 1933
This is known only from the types which were collected at 33’51”
66”43’W with an open net fished to 50 m. The mantle length of the
largest is 4.4 cm.
TAONIINAE
Most of the generic names within this sub-family are of little value
and have been used indiscriminately in the past. In some cases a
generic term has been used to delineate a structural form which almost
certainly corresponds to a development stage. Thus, Bathothuuma,
Sandalops and Corynomma have all the features of young larval
taoniids as indicated by species in which a sufficiently good series of
sizes have been collected to determine the changes in form during
growth (Muus, 1956). These early larval features are, eyes on long
peduncles, very short arms, an elongation of the head anterior to the
eyes or “rostrum ” and a sac-like body with small terminal fins.
(Fig. 49). The species of the genera Taonidium and Teuthowenia have
eyes on rather shorter peduncles bet still have short arms and a
distinct rostrum although the latter is short in some species. Fusocranchia has sessile eyes and no rostrum but it also has minute arms, a
sac-like body and pedunculate fins. The species in Megalocranchia and
Helicocranchia have sessile eyes, relatively long arms and virtually
no rostrum. Throughout the series there is also a trend towards a
more elongate and pointed body with larger elongated fins; in the
genera Taonius, Phusmatopsis and Galiteuthis, which reach from 30 cm
to 1 m in mantle length, these trends are extended. I n Fig. 49 the
developmental trends are shown longitudinally and the genera have
been grouped transversely according to structural features which either
relate them to, or separate them from, other species of their own
“level” or of other “levels” of development. It is hoped that further
work on developmental series will connect up some of these “genera”.
In the light of the above remarks, it will be seen that the following
ecological details must be treated with extreme caution.
I. Sandabps
The members of the three species are all extremely small and have
early larval characters (Fig. 49).
1. Sandalops ecthambus Berry, 1920
The type and only specimen was taken north of Little Bahama
Bank in the North Atlantic at a depth of 0-100 m. It has a mantle
length of 2.2 cm.
K’