. Bulletin - United States National Museum. Science. COPEPODS OF THE WOODS HOLE KEGION" 521 Trunk straight, spindle-shaped, narrower than the cephalothorax; caudal rami small. First antennae 3-segmented; second antennae biramose, the exopod 2-segmented; second maxillae and maxillipeds close together and about the same size, often with a large process between the bases of the second maxillae. KEY TO THE SPECIES (FEMALES) 1. A single pair of posterior processes, either dorsal or ventral 2 Two pairs of posterior processes, one dorsal, one ventral 3 2. Posterior processes cylindrical, widely
. Bulletin - United States National Museum. Science. COPEPODS OF THE WOODS HOLE KEGION" 521 Trunk straight, spindle-shaped, narrower than the cephalothorax; caudal rami small. First antennae 3-segmented; second antennae biramose, the exopod 2-segmented; second maxillae and maxillipeds close together and about the same size, often with a large process between the bases of the second maxillae. KEY TO THE SPECIES (FEMALES) 1. A single pair of posterior processes, either dorsal or ventral 2 Two pairs of posterior processes, one dorsal, one ventral 3 2. Posterior processes cylindrical, widely separated and dorsal to the ovisacs; no genital process concava (p. 521) Posterior processes laminate, close together and ventral to ovi- sacs ; genital process present niitrata (p. 522) 3. Ventral processes two and a half times as long as dorsal; trunk twice as long as cephalothorax elegans (p. 522) Ventral processes little longer than dorsal; trunk only half as long as cephalothorax gulosa (p. 523) BRACHIELLA CONCAVA Wilson Figure 300 BracMella concava Wilson, Proc. U. S. Nat. Mas., vol. 44, p. 262, pi. 51, 1913. Occurrence.—A single female taken from the gill arches of the sting ray {Dasytatus mwmus) captured at Menem- sha Bight, Marthas Vineyard, August, 1925. Distribution.—Jamaica, West Indies (Wilson). Color.—Head and neck a clear carti- lage gray; trunk yellowish; oviducts white; eggs straw yellow, deepening in color with development. Female.—Cephalothorax flexed back- ward and longer than the trunk; head much enlarged; trunk short, oval, strongly depressed, its dorsal surface crenate; pos- terior processes attached close together on the midline, but turned outward at first and then backward, thus becoming widely separated, each four times as long as wide; ovisacs the same diameter as the processes but twice as long. First antenna indistinctly segmented; second antennae turned across the frontal margin; second maxillae separate to their tips, bulla bell-shaped. L
Size: 1153px × 2166px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
