Distribution
|
Boreal (Skagerak, Norwegian Sea)
|
Lusitanian (French Atlantic coast, Irish Sea)
|
NW Atlantic, Maine, USA
|
Pacific; Moss Beach, San Mateo, California,
|
Depth
|
Sublittoral, 30–150 m
|
Intertidal
|
Intertidal
|
Probably intertidal
|
Bottom type
|
Clay
|
Sand, gravel
|
Mudflat
|
Probably sand
|
Max body length (mm)
|
c. 15
|
75
|
470
|
25
|
# of gill pores
|
9–17
|
14–50
|
>100
| |
Proboscis colouration
|
Uniformly light pink to golden yellow
|
Yellow with dark green spots
|
Cream-white
|
White
|
Proboscis stalk colouration
|
Light, whitish
|
Dark green or dark brown
| | |
Collar colouration
|
White with transversal yellow bands
|
Yellow with dark green spots
|
Cream-white to orange-brown
|
Yellow
|
Trunk colouration
|
Uniformly light golden yellow
|
Pigmentation of different colours
|
Branchial region translucent yellow to light yellow-brown; hepatic region brown; intestinal region pale yellow, fades posteriorly
|
White
|
Dorsal mesenterium above the pericardium
|
Absent
|
Well developed
|
Large and well developed
|
Lower half large and well developed, upper half tapering
|