Thalestrella obscura (Mielke, 1994b) comb. nov.

Karllangia obscura Mielke, 1994b

Original description. Mielke (1994b): 148, 150–152; Figs 7–8.

Type locality. Costa Rica, beach slope of Manzanillo (Caribbean coast) .

Notes. Thalestrella obscura comb. nov. occurs sympatrically with T. pulchra comb. nov. at the type locality. It differs from the latter by the absence of well developed denticulodigitate hyaline frills on the abdominal somites and the inner seta on P1 exp-2, and by the presence of a tuft of very long setules on the male antennary allobasis near the articulation with the exopod, and only five elements on the female P5 exopod.