Boccardia pseudonatrix Day, 1961

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Pest, Indigenous


Prostomium bilobed. CaruncleB_pseudonatrix_frontpage_watermarked to chaetiger 2. 1 or 2 pairs of eyes. Brown pigmentation on caruncle, palps brown with white bars. In life may have luminescent spots on dorsal anterior.Notochaetae on chaetiger 1. Modified spines of chaetiger 5 in dorsal row with swollen tips, a raised central cone and raised outer ridge, ventral row falcate. Mid-dorsal ridge from chaetiger 5 to middle of chaetiger 8. Hooded hooks from chaetiger 7, up to 8 per ramus. Branchiae on chaetiger 2 longer than on chaetigers 3 & 4; never overlap mid-dorsum; posterior third of body abranchiate. Dorsal of posterior chaetigers with white glands. Pygidium reduced, forming pair of flattened cushions.

Largest specimen: 20 mm for 83 chaetigers


South Africa: Kleinzee & Paternoster on oyster farms, Knysna (type locality), Hamburg and Haga Haga.
New Zealand, Australia


Adelphophagic, egg capsule single ‘sausage’.


Originally recorded boring in rock in Knysna. Bore into farmed abalone Haliotis midae and oysters Crassostrea gigas and wild oysters Saccostrea cuccullata.


Citation: Simon C. A. and van Niekerk S. E. (2012), Boccardia pseudonatrix Day, 1961 modified May 2015, The Simon Polychaete Lab-, Date Accessed:June 24, 2019.