D. millbayana Lemche, 1976.
Hydroid prey Plumularia setacea. 1: polyp colony with scale. 2: magnified hydrothecae. 3: magnified gonothecae. Plate LXVI, modified, Hincks (1868).
The body, length 6.8 mm, has sparse surface mottling of small irregular dark red spots. No subepidermal red or brown pigment in mesial face of cerata (4). Four concentric rings of rounded tubercles (5), can have up to five. Each tubercle has a dark red to black spheroid (6) and many white granules. The cerata have irregular dark red to black spots on the surface between tubercles (7).
Menai Strait, Wales. June 2018. Leg. P. Brazier & L. Kay, det. B. Picton.