. Bulletin - United States National Museum. Science. 400 BULLETIN" 15 8, UNITED STATES NATIONAL MUSEUM second segment; terminal claw maxillipeds shutting into a socket on basal segment; fifth legs conspicuous dorsally. Total length, 13-20 mm. Remarks.—This is the largest species of the genus, and is prac- tically always found upon the external surface of its host. Both sexes are also sometimes taken while swimming freely in the plankton. CALIGUS BALISTAE Steenstrup and Liitken Figure 246 Caligus halistae Steenstrup and Lutken, Kong. Danske Vid. Selsk. Skrift., ser. 5, vol. 5, p. 356,
. Bulletin - United States National Museum. Science. 400 BULLETIN" 15 8, UNITED STATES NATIONAL MUSEUM second segment; terminal claw maxillipeds shutting into a socket on basal segment; fifth legs conspicuous dorsally. Total length, 13-20 mm. Remarks.—This is the largest species of the genus, and is prac- tically always found upon the external surface of its host. Both sexes are also sometimes taken while swimming freely in the plankton. CALIGUS BALISTAE Steenstrup and Liitken Figure 246 Caligus halistae Steenstrup and Lutken, Kong. Danske Vid. Selsk. Skrift., ser. 5, vol. 5, p. 356, pi. 1, fig. 1, 1861.—Wilson, Proc. U. S. Nat. Mus., vol. 28, p. 601, pi. 15, 1905. Occurrence.—Both sexes taken from fins of file fish [Alutera scripta) at Station 2565, Albatross, southeast of Nantucket. Distribution.—West Indies (Steentrup and Liitken, Wilson); Cape Verde (Brady) ; Sargasso Sea (Brian). Color (preserved material).—Body light yellow, tinged in the center of the carapace and genital segment with brown; egg strings orange; eye reddish. Female.—Carapace more than half the entire length; lunules small, circular, and not projecting; fourth segment very narrow and rhombic; genital segment wider than long, its posterior margin concave, with lobes but no leg rudiments at the corners; abdomen short and wide, 1-segmented; caudal rami small and well separated. Furca shaped like a bootjack; second segment of maxillipeds with a prominent knob on its outer margin near the proxi- mal end; fourth legs 3-segmented, with ^ -i-r four exceptionally long and stout spines. Figure 246.—CaJij/Ms ialistae: a. Total length, 4— mm. Female, dorsal; ft, female, Male.—Carajmce twice as loug and fourth leg • i i /» i three times as wide as the rest oi the body; fourth segment even smaller than in the female and rhombic; genital segment semilunar, the lobes at the posterior corners long, acuminate, and tipped with leg rudiments. Abdo- men 1-segmented, as long and half
Size: 1142px × 2188px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
