Hooge MD 2003 (citation) - Haplogonaria stradbrokensis belongs to the genus Haplogonaria by virtue of its unpaired ovary, paired testes, and seminal bursa that lacks a bursal nozzle. This species is most similar to H. arenaria (Ax, 1959), and H. pellita (Marcus, 1951). Compared to H. arenaria, H. stradbrokensis has a larger, more convoluted seminal bursa, and a seminal vesicle with a thicker wall. H. stradbrokensis has fewer rhabdoids, a larger seminal bursa that is positioned closer to the ventral body wall, and a shorter vagina than does H. pellita.
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