Named for Chettusia gregaria, or sociable plover. {It belongs to the Chardadriidae family and is endangered in Europe. In 1994 only 1,000 pairs were counted.} (M 33794; M 34089) _ _.
Discovered on 25-9-1973 in Palomar by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T.