40
Table 2
Comparison of morphological characteristics among four harmful shell borers, Polydora brevipalpa
, P. uncinata
, P. haswelli
, and P. aura
from Japan, South Korea,
northeast China, and Australia
Polydora
species
Body color
Pigmentation
Occipital
tentacle
Notochaetae
on chaetiger 5 Special notochaetae in posterior chaetigers
Palps
Prostomium
Chaetigers 1–4 Pygidium
Polydora
brevipalpa
Tan
Black bars
Absent
Absent
Absent or white
or black
Absent
Absent
Absent
Polydora uncinata
Tan
Black bars
or absent
Black or absent Black or absent Absent or black Present
Present
Recurved hook accompanying capillaries
Polydora haswelli
Tan
Black bars
Black or absent Black or absent Absent
Absent
Present
Absent
Polydora aura
Orange
or tan
Absent
Absent
Absent
Absent
Present Absent
Tight cylindrical bundles of short needles
accompanying capillaries
Bold entries show distinguishable characters of the species
W. Sato-Okoshi et al.