LAGYNIDAE Schultze, 1854
Lagynidae Carpenter. 1861 (*486), p. 458, nom. corr. pro family Lagynida.
Lagynida Schultze, 1854 (*2824), p. 52.
Plagiophryiinae Vejdovský.1881(*3284), p. 138( subfamily). Diplophryidae Taránek, 1882 (*3129), p. 235. Myxothecinae Rhumbler,1895 (*2616), p. 79 (subfamily). Microcometidae Poche. 1913 (*2433), p. 175. Armyxothecnia Rhumbler, 1913 (*2621), p. 343 (subfamily; err. emend.).
Lagyninae Galloway, 1933 (*1205), p. 41 (subfamily). Belariini De Saedeleer, 1934 (*947), p. 7.79 (tribe). Mikrogromiidae De Saedeleer, 1934 (*947), p. 7, 68. Mikrogromiini De Saedeleer, 1934 (*947), p. 7, 68 (tribe). Heterogromiini De Saedeleer, 1934 (*947), p. 7, 82 (tribe). Microgromiidae Doflein and Reichenow, 1952 (*965), p. 730 (err. emend.).
Microcometesidae Grospietsch. 1958 (*1315), p. 35, 57 (err. emend.).
Test small, membranous to firm, protein‑aceous, and may have ferruginous surface crust, rarely includes agglutinated matter; aperture single or with numerous apertures that are not localized; may form colonies; biflagellate gametes. Holocene.