Ionella agassizi Bonnier, 1900
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Family:  Bopyridae ()
Max. size:  0.5 cm TL (male/unsexed); 1 cm TL (female)
Environment:  benthic; marine; depth range 0 - 10 m
Distribution:  Southeast Pacific: Probably endemic to Chile.
Diagnosis:  Females are 0.8 to 1 cm in length and 1.1 to 1.5 cm in width. In both live and preserved specimens, they are whitish-yellowish in color and have tiny dark visible eyes. Its antennae is absent or strongly reduced and the pereopods are small. Oostegites large flaps forming completely enclosed marsupium, which contains thousands of embryos. Males on the other hand are 0.3 to 0.5 in length. They are whitish in color and have visibly small elongated eyes. Pereon segments with small pereopods. Pleotelson is very small, that looks like an inflated tubercle.
Biology:  It is parasitic on ghost shrimp Neotrypaea uncinata found on sand flats, where it inhabits the branchial chamber (Ref. 87801).
IUCN Red List Status: Not Evaluated (N.E.) Ref. 123251)
Threat to humans: 
Country info:   
 

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