Diagnosis
Male 2nd pleopod with multi-segmented exopod and endopod. Male 3rd pleopod with exopod styliform, ending in 2 simple setae; endopod multi-segmented, no curved spines at tip.
Female pleopods: 1st pair biramous, 2nd to 5th pairs uniramous.
Species treated:
Gastrosaccus brevifissura
Gastrosaccus kempi
Gastrosaccus namibensis
Gastrosaccus olivae
Gastrosaccus psammodytes