. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. SYSTEMATIC REPORT 73 In B. rostrata the lateral margins of the telson are armed with eight to ten very long strongly developed spines, the spaces between them being occupied with a number of much smaller spines in graduated series. In B. illigi the lateral spines are shorter and relatively stout and, although they do show some arrangement in series, there is no very marked difference between the sizes of the large spines and the small ones. The form of the cleft of the telson is the most strikin
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. SYSTEMATIC REPORT 73 In B. rostrata the lateral margins of the telson are armed with eight to ten very long strongly developed spines, the spaces between them being occupied with a number of much smaller spines in graduated series. In B. illigi the lateral spines are shorter and relatively stout and, although they do show some arrangement in series, there is no very marked difference between the sizes of the large spines and the small ones. The form of the cleft of the telson is the most striking difference between the two species. In B. illigi it is deeper than in B. rostrata and its proximal end is rounded without lateral slits or a dilated area. The unarmed portion of the outer margin of the exopod of the uropod is relatively much longer than in B. rostrata and its distal end is marked by two spines instead of one. The endopod. Fig. 11. Boreomysis plebeja Hansen. A, telson and right uropod of male in dorsal view, x 16. Boreomysis illigi (B-E). B, anterior margin of carapace of female in dorsal view, x 12; C, anterior end of female in lateral view, x 12; D, right antenna, x 16; E, telson and right uropod in dorsal view, x 16. is armed with two long spines distal to the statocyst; in B. rostrata there is only one spine. The form of the eye is very characteristic in B. illigi. It is larger than in B. rostrata and the long, strong ocular papilla, with a large ganglion clearly visible at its base, projects forward beyond the anterior margin of the cornea. Distribution. Illig's male specimens were taken at two stations in the Atlantic, one to the south of the Canary Isles and the other to the south of Sierra Leone, and at one station in the Indian Ocean near Ras Hafun. The Discovery records extend its known geographical range considerably to the southward in the eastern waters of the South Atlantic. It appears to have a considerable vertical range. Illig's specimen
Size: 1744px × 1433px
Photo credit: © Paul Fearn / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, booksubjectocean, booksubjectscientificexpediti
