LOWER BEAK
We examined beaks of E. atlantica from two individuals (101, 105 mm ML). The following characters are taken from Clarke (1986). Arithmetic means from the two squid are used for characters requiring measurements.
- Pigmentation - Normal.
- Pigmentation pattern - See photographs.
- (Wing length)/(visible rostral edge) (profile) - 1.7
- Height/baseline (profile) - 1.13
- (Length from rostral tip to wing tip projected on baseline)/baseline (profile) - 0.21
- (Hood length)/(crest length) (profile) - 0.62
- (Crest length)/baseline (profile) - 0.65
- (Rostral base)/(visible rostral edge) (profile) - 0.98
- (Hood length)/(visible rostral edge) (profile) - 0.82
- Rostral width ratio [LRL/(length between jaw angles)] - 2.78
- Visible rostral angle (profile) - Obtuse
- - 30. As in E. famelica
Figure. Left and right side views of the same lower beak of E. atlantica, 105 mm ML, 4.7 mm LRL, immature male, 34°N, 35°W (North Atlantic). Photographs by R. Young.
Figure. Left and right side views of the same lower beak of E. atlantica, 101 mm ML, 4.1 mm LRL, immature female, 34°N, 35°W (North Atlantic). Photographs by R. Young.
Figure. Left and right side-oblique views of the same lower beak of E. atlantica, 105 mm ML, immature male, 34°N, 35°W (North Atlantic). Photographs by R. Young.
Figure. Front (left) and rear (right) views of the same lower beak of E. atlantica, 105 mm ML, immature male, 34°N, 35°W (North Atlantic). Photographs by R. Young.
Figure. Top view of the lower beak of E. atlantica, 105 mm ML, immature male, 34°N, 35°W (North Atlantic). Photograph by R. Young.
Figure. Two slightly different oblique rear-views of the same lower beak of E. atlantica, 105 mm ML, immature male, 34°N, 35°W (North Atlantic) showing the width of the lateral wall ridge (arrow). Photographs by R. Young.
Comments
E. atlantica lower beaks are very similar to those of E. famelica and the few beaks we have examined are insufficient to determine if they can be separated. To distinguish E. atlantica (and E. famelica) from other slender-beaked mastigoteuthids (ie, Mastigopsis. hjorti and Mastigotragus pyrodes) the page on E. famelica beaks.
UPPER BEAK
Figure. Side views of the upper beak of E. atlantica. Left - 101 mm ML, immature female, 34°N, 35°W. Right - 105 mm ML, immature male, 34°N, 35°W. Photographs by R. Young.
Figure. Various views of the upper beak of E. atlantica, 105 mm ML, immature male, 34°N, 35°W. Left - Frontal view. Middle - Top view. Right - Bottom view. Photographs by R. Young.
Comments
To be added.
