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. 2007 Jun 13;2(6):e522. doi: 10.1371/journal.pone.0000522

Figure 1. A mating pair of Acilius sulcatus.

Figure 1

The male on top has access to air with the abdominal apex and can replenish the air supply kept in the subelytral space [30]. The female below the surface is at this stage beyond reach of atmospheric oxygen.