Family Sphaeromidae
Sub-family Sphaerominae-Sphaerominae Platybranchiatae

Cassidina typa M. Edwards, 1840.

Cassidina typa M. Edwards, 1840: 224, pl. 32, figs. 10–16.

Tattersall, 1921: 226–227.

Cassidina neo-zealanica G. M. Thomson, 1889: 264, pl. 14, figs. 1–4.

Material Examined: Station BOL (VUZ. 43), 8 specimens; Station BOK (VUZ. 44), 2 males, 10mm, 6 females, 6–9 mm; Station BOL (VUZ. 48), 1 male, 12 mm; Station BOL (VUZ. 49), 1 female, 8 mm, ovigerous; 2 males, 10–11 mm.

Distribution: Cook Strait, Bay of Islands, Akaroa Harbour, Spirits Bay, Otago Harbour, Blueskin Bay.

Discussion: This flattened plate-like species is common on sandy bottoms around New Zealand from 0–100 fathoms. Thomson refers to it being found frequently on seaweed. It is common amongst the debris taken in flatfish trawls off Otago Harbour.