Trinematidae

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Genus Corythion

In ventral view, the shell is ovoid; in lateral view the shell is compressed; cross-section lenticular lateral margins often slightly acute. Shell is covered by on type of body plates: circular, rectangular, imbricated, irregularly distributed but at lateral margins in rows. Aperture is invaginated, oval, semicircular or circular, surrounded by plates with one central tooth. Some species have short organic or siliceous spines. Type species: Corythion dubium Tarànek, 1881

Genus Playfairina

Shell is circular in cross section, tapering towards the aperture; fundus rounded or pointed. Shell is covered large and small idiosomes, arrangement in most cases as in Trinema. Aperture is circular, not invaginated, surrounded by one row of denticulated marginal plates. Pseudopoida are unknown, but doe to the homologies in shell morphology Playfairina is placed here. Two species. Ecology: mosses, soils. Type species: Playfairina caudata (Playfair, 1917) Thomas, 1961

Genus Trinema

In ventral view, shell is ovoid or broad oval, sometimes with almost parallel sides. In lateral view, the dorsal side is arched or flattened towards the aperture, ventral side is either flat or concave. Shell is covered by body-scales of two types: large circular plates and smaller circular or broad elliptical scales in between, overlapping. Aperture is sub-terminal or ventral, circular or oval, invaginated, surrounded by rows of toothed apertural plates. Ecology: freshwaters, mosses, soils. Type species: Trinema enchelys (Ehrenberg, 1838) Leidy, 1878

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