Penardia Cash, 1904 (ref. ID; 4670)

[ref. ID; 1618]
When inactive, rounded or ovoid; at other times expanded; exceedingly mobile; endoplasm chlorophyll-green with a pale marginal zone; filopodia, branching and anastomosing, colorless; nucleus inconspicuous; one or more contractile vacuoles, small; fresh water. (ref. ID; 1618)

[ref. ID; 1923]
Naked amoebae, with pseudopods filiform and pointed. (ref. ID; 1923)

[ref. ID; 4670]
Comments; Penardia is similar in some respects to Nucleosphaerium but it has an inconspicuous nucleus and is exceedingly motile when not at rest. After feeding Penardia is inert and ovoid. The pseudopodia are especially active when trapping food, which mainly consists of rotifers. It is unlike Nucleosphaerium also in that it has a fine network of anastomosing pseudopodia, and no mucilaginous envelope. (ref. ID; 4670)

[ref. ID; 5694]
Amoeboid protists. (ref. ID; 5694)

  1. Penardia cometa (Penard) (ref. ID; 3497, 5624)
  2. Penardia mutabilis Cash (ref. ID; 1618, 1923)

Penardia cometa (Penard) (ref. ID; 3497, 5624)


The body is round or oblong, and extrudes radially filopodia branching rarely in pelagic condition. The nucleus is usually at the center, and contractile vacuoles generally appear. Small young specimens sometimes swim with a filopodium moving as like as a flagellum. (ref. ID; 3497)


Length without pseudopodia 3-20 um. (ref. ID; 3497)

Penardia mutabilis Cash (ref. ID; 1618, 1923)


Body when at rest roughly ovoid; pseudopodia projecting from the surface at various points, slender and pointed, branching and anastomosing, ultimately forming a widely-spreading network; colorless. Habitat swampy ground. (ref. ID; 1923)


Resting form 90-100 um in diameter; extended forms (including pseudopodia) 300-400 um long. (ref. ID; 1618, 1923)