. Bulletin - United States National Museum. Science. 42 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM mens the posterior body is usually bent back at right angles to the anterior body, as noted by Scott and Pesta. Family PSEUDOCALANIDAE Genus CLAUSOCALANUS Giesbrecht, 1888 Head fused with the first segment; fourth and fifth segments also fused, with rounded posterior corners; urosome 4-segmented; exopod of second antenna 6-segmented, longer than the endopod; first an- tennae just reaching the genital segment; exopods of the first four pairs of legs 3-segmented; first endopod 1-segmented, second
. Bulletin - United States National Museum. Science. 42 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM mens the posterior body is usually bent back at right angles to the anterior body, as noted by Scott and Pesta. Family PSEUDOCALANIDAE Genus CLAUSOCALANUS Giesbrecht, 1888 Head fused with the first segment; fourth and fifth segments also fused, with rounded posterior corners; urosome 4-segmented; exopod of second antenna 6-segmented, longer than the endopod; first an- tennae just reaching the genital segment; exopods of the first four pairs of legs 3-segmented; first endopod 1-segmented, second endopod 2-segmented, third and fourth endopods 3-segmented; fifth legs uni- ramose, 3-segmented; basi- pods and exopods of second and third legs considerably wider than those of the fourth legs. One species. CLAUSOCALANUS ARCUICORNIS (Dana) FiGtJBB 24 Calanus arouicornis Dana, Proc. Amer. Acad. Arts and Sci., vol. 2, p. 12, 1849. Claiisocalantis arcuicornis Gies- brecht and ScHMErL, Das Tierreich, Lief. 6, Copepoda p. 27, 1898. Occurrence.—Three males and numerous females were 'Clausocalanus arcuicornis: a. Female, taken by Wheeler at the SUr- b, male, dorsal; c, fifth legs, male; f^ce in the Gulf Stream south of Marthas Vineyard. Distribution.—^Messina (Glaus) ; Mediterranean, tropical Atlantic and Pacific (Giesbrecht) ; Indian Ocean, Ked Sea (Thompson and Scott); northern Atlantic (Cleve) ; Arabian Sea, Indian Ocean, Malay Archipelago (Cleve). Color.—Not very transparent, with red pigment in some parts of the thoracic segments, on the dorsal and ventral surfaces, and in the genital segment. In the male the pigment is on the whole more abundant and may extend into the basal segments of the first anten- nae. In rare instances all the cuticle has a violet color; the eggs are rose colored (Wheeler).. Figure dorsal d, fifth legs, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colorat
Size: 1089px × 2295px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
