“Pseudione paucisecta, new species
Body of female ovate, twice as long as wide, twisted somewhat to one side. Color, uniformly light yellow.
Head very large, triangular in shape, with frontal margin widely rounded or arcuate. A wide frontal border, somewhat irregular in outline, surrounds the anterior portion. Eyes absent. First pair of antennae consist of three joints; second pair of five joints.
Ovarian bosses present on the anterior portion of the first four thoracic segments; lateral to these, on the anterior portion of the segments, are the wide epimeral plates, which have a tendency to be irregular along the lateral margin. The epimera occupy the whole of the lateral margin of the three posterior segments, and are produced laterally into irregular processes.
The segments of the abdomen are distinct with the epimera extending as narrow, elongated plates on either side of the first five segments. Terminal segment knoblike in appearance with well-rounded margins.
Pleopoda consist of five pairs of double-branched narrow, elongated tapering lamellae directed backward, the inner branches being smaller than the outer branches in the last two segments. The uropodal are a single pair of lamellae, both lamellae being irregular in outline.
The five pairs of incubatory plates completely enclose the incubatory pouch, meeting in the median ventral line. The terminal lobe of the distal segment of the first pair is not defined. All the legs have a high and narrowly rounded expansion or carina about the middle of the basis.
The male is twice as long as broad. Head transverse; eyes absent. Segments of thorax of equal length. Abdomen short, occupying less than one-sixth of the entire length and composed of only five segments, all distinct, with terminal segment small, rounded.
Only one specimen was taken by the U.S. Fish Commission steamer Albatross off Port Ortway, Patagonia. Parasitic on Munida curvipes Benedict.
Type.—Cat. No. 29096, U. S.N.M.”
(Richardson, 1904a: 85-86)
