Abstract
Clam shrimps of the family 1.ynccidac differ markedly from all other families of the Conchostraca. The biology and morphology of the genus Lynceus are poorly known. In North America the genus is represented by four species: L. brachyurus, L. mucronatus, L. brevifrons and L. grarcilicornis. The last species, previously known from two localities in Texas, is reported from an ephemeral pond in north Florida. Amoung the characters distinguishing L. gracilicornis from North American congeners arc dimorphic male claspers and a broad, straight rostral margin. Females are distinct in having a smoothly rounded, distal rostra1 margin. External and internal morphology are described using light and scanning electron microscopy. Scanning electron microscopy reveals the presence of frontal setose sensory fields and a small rostral pit in both sexe5. Numerous setal types are described from the claspers and posterior thoracopods. Internal structures include a large anterior hepatopancreas, C‐shaped gut and large paired gonads ventro‐lateral to the gut.
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