Athersuch, Horne & Whittaker, 1983
Carapace large, 0.85-1 mm long, strongly inflated, with prominent alar expansions. Greatest width well behind mid-length. Compressed posteroventral marginal area relatively broad. Posterior margin denticulate. Dorsomedian sulcus weak. Distal process of male copulatory appendage relatively large, proximally broad, distally narrow, with a sinuous posterior margin.
Previous records of B. turgida from British waters are now considered to be erroneousand can be referred to either B. robinsoni or B. bradleyi. B. robinsoni is more elongate than either B. bradleyi or B. turgida.
So far known only from British coastal marine sublittoral waters.