Lagis koreni is an infaunal segmented worm typically 2-3 cm in length and relatively thick. The body is divided into 3 distinct sections- a plate-like head, an abdomen with chaetae on the anterior 15 segments and a flattened, posterior appendage (scaphe) lacking chaetae. The head of Lagis koreni possesses an opercular plate for sealing its burrow, 2 pairs of tentacles plus numerous buccal cirri and 2 distinctive bundles of golden spines (paleae) used for burrowing. It is white in colour with pink iridescence, 2 pairs of red gills, and a red ventral vessel which is visible owing to its overall transparency. It lives head-down in a conical tube with a mucous extension.Adult densities may exceed 1000m², e.g. Eagle (1975), but numbers characteristically fluctuate widely from year to year, owing to variations in recruitment success and mortality. Lagis koreni often co-occurs with high densities of Abra alba (e.g. Eagle 1975). Lagis koreni is a significant food-source for commercially important demersal fish, especially dab and plaice, e.g. Macer (1967), Lockwood (1980) and Basimi & Grove (1985). The genus Lagis is often considered synonomous with Pectinaria, with the former sometimes considered a subgenus of the latter (e.g. Degraer et al. 2006).
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