Nannastacidae

Nannastacidae is a family of crustaceans belonging to the order Cumacea. Cumaceans, commonly known as hooded shrimp or comma shrimp, are small, marine peracarid crustaceans found in various marine environments worldwide. The family Nannastacidae is characterized by specific morphological features, though variations exist within the group. Members of this family are typically small, with a carapace that forms a distinct "hood" over the anterior part of the body. Their bodies are generally elongated and segmented.

These crustaceans are benthic, meaning they live on the seafloor. They inhabit a range of substrates, from fine mud and sand to gravel and shell fragments. Nannastacidae are deposit feeders, using their specialized mouthparts to sift through sediment for organic matter. Their life cycle involves direct development, with young hatching as miniature adults.

The taxonomic classification within Nannastacidae includes several genera, each with its own suite of species. Distinguishing between genera and species often relies on subtle differences in antennal structure, pereopod morphology, and the shape of the telson. Research on Nannastacidae contributes to our understanding of marine biodiversity and the ecological roles of benthic invertebrates in sediment ecosystems. Their presence and abundance can serve as indicators of environmental conditions in their habitats.