Family BAIRDIIDAE Sars, 1888

Museums

Regional Maps

• Bairdidae Sars, G.O. 1888. Nye Bidrag til Kundskaben om Middlehavets Invertebratfauna. 4. Ostracoda Mediterranea. Archiv for Mathematik og Naturvidenskab, Kristiania 12: 173-324 [288].

  Type genus:

   Bairdia McCoy, 1844.

Diagnosis

Carapace mostly 1.5 mm long or less, usually with characteristic "cocked hat" shape. Valves smooth or ornamented with reticulation, spines, nodes, tubercles, ribs, etc. Valves marginal zone with well-developed fused zone and calcified inner lamella, often with selvage and lists. Hinge robust and simple. Adductor muscle scar: group of 7–12 scars in loose rosette or radial pattern. Normal pores simple. Female with 7 pairs of appendages and caudal ramus. Antennula with 7 segments. Antenna with 4 segments, without swimming setae. Exopod: short segment with 1 or 2 long setae. Mandibular branchial plate small with 3 rays. Maxillular branchial plate with many unreflexed and 6–8 reflexed rays. Male brush-shaped organ always present. Last three thoracopods all walking legs consisting of protopod, usually 4-segmented endopod and branchial plate (reduced on second and third thoracopod, well developed on first one). No Zenker's organ present. Copulatory complex external (not enclosed by peniferal sheath). Caudal ramus usually well developed, each ramus with 2 terminal claws and up to 5 setae on posterior margin. In males caudal ramus incorporated into posterior (proximal) part of male copulatory appendage.

Diagnosis References

Horne, D.J., Cohen, A. & Martens, K. 2002. Taxonomy, morphology and biology of Quaternary and living Ostracoda. Geophysical Monograph 131: 5-36 [33]

History of changes