Polydora haswelli/neocaeca Blake and Kudenov 1978/Williams and Radashevsky 1999

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Status

Rare, Alien

Description

Prostomium bilobed, caruncle to end chaetiger 3. P_cf_haswelli_frontpage_watermarked2 pairs of eyes arranged in trapezoid. In life dark pigment along the lateral margins of the prostomium, dark patches on the peristomium and at the base of the notopodial lobes of chaetigers 1 – 4; smaller, lighter spots on chaetigers 5 & 6. Some pigmentation around mouth and along anterior mid-ventral line.  Palps with dark bands. No notochaetae on chaetiger 1. Modified spines of chaetiger 5 slightly curved with small accessory tooth in concave side. Hooded hooks start on chaetiger 7, up to 10. Sometimes accompanied by fine companion chaetae. Branchiae start on chaetiger 7, last 5 chaetigers abranchiate; don’t touch along mid-dorsum. Pygidium saucer-shaped.

38 mm for 193 chaetigers

Ecology
Bores into shell of scallop, Pecten sulcicostatus.

Distribution
South Africa; only in False Bay.

 

Note
Identity in dispute, needs clarification, molecular evidence confirms alien status.

Citation: Simon C. A. and van Niekerk S. E. (2012), Polydora haswelli/neocaeca Blake and Kudenov 1978/Williams and Radashevsky 1999 modified May 2015, The Simon Polychaete Lab- http://thesimonpolychaetelab.com/polydora-cf-haswelli/, Date Accessed:June 24, 2019.