Plagiopyla minuta, POWERS, 1933

PLAGIOPYLA MINUTA POWERS, 1933

1933: Plagiopyla minuta – Powers, Biol. Bull., 65: 117; pl. II; fig. 11 (original description, illustrated, no type material available).

1946: Plagiopyla minuta Powers, 1933 Kudo, Protozoology , 3rd edn, CC Thomas ed., Springfield, 596–597 pp.; fig. 282b (revision).

1954: Plagiopyla minuta Powers, 1933 – Beers, J. Protozool., 1: 86–89; figs 1–4 (illustrated record).

1984: Plagiopyla minuta Powers, 1933 – Berger & Lynn, J. Protozool., 31: 436, 441–442; figs 1A, 5–7, 29–30 (ultrastructural study).

2007: Plagiopyla minuta Powers, 1933 – Jankowski, Russian Acad. Sci. , p. 792 (revision).

Improved diagnosis ( Fig. 18F): Body length 50–75 µm, body width 36–46 µm. Number of somatic kineties estimated around 50. Striated band present (estimated length: 48 µm; width: 3 µm). One dumb-bell-shaped to ovoid macronucleus (estimated size: 30 × 15 µm) and a single, compact-type micronucleus. One contractile vacuole. Cytoproct, located on the dorsal part of the cell (estimated length: 12 µm). Spindle-shaped extrusomes.

Ty p e l o c a l i t y: I n t e s t i n e o f t h e s e a u r c h i n Strongylocentrotus droebachiensis . Found in the Bay of Fundy, USA ( Powers, 1933).

E c o l o g y a n d d i s t r i b u t i o n: E n d o c o m m e n s a l o f Strongylocentrotus droebachiensis . Found in USA in the Bay of Fundy ( Powers, 1933) and Mt. Desert Island, Maine ( Beers, 1954), Canada, Logy Bay ( Berger & Lynn, 1984).