Boccardia pseudonatrix Day, 1961

Pest, Indigenous

Up to 20 mm for 83 chaetigers. Prostomium strongly bilobed. Caruncle to chaetiger 2. 1 or 2 pairs of eyes. Brown pigmentation on anterior part of prostomium, 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. Hooded hooks from chaetiger 7, up to 8 per ramus.
Mid-dorsal ridge from chaetiger 5 to middle of chaetiger 8.
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.

Adelphophagic, egg capsule single ‘sausage’. Larvae tinged with yellow-gold.

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

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

Very similar morphology to Boccardia semibranchiata from Spain. Taxonomy of these species require further investigation.

Cite as: Van Niekerk, S. and Simon C.A. (2012) Boccardia pseudonatrix Day, 1961, modified May 2019. (, Accessed on <day/month/year>)