Penard Labs

Penard Labs

●●●● Sphaerothecina

Kosakyan 2016

Test rigid or more or less flexible, either completely chitinoid or comprising recycled organic or mineral particles held together by an organic cement, or composed of self-secreted chitinoid or siliceous elements; always rounded in radial symmetry but varying in height from flattened saucer-shaped, hemispheric or more elongated to egg-shaped; pseudostome circular or lobed, surrounded by a collar; produces thick, digitate pseudopodia (lobopodia).

●●●●● Arcella

Ehrenberg 1832

Test more or less circular, aperture central, invaginated, in many species surrounded by a tube or a circle of pores.

  •  Arcella gibossa top view

    Arcella gibossa top view

  •  Arcella gibossa test details

    Arcella gibossa test details


  •  Arcella gibossa top view

    Arcella gibossa top view

  •  Arcella gibossa side view

    Arcella gibossa side view

  •  Arcella gibossa

    Arcella gibossa

Arcella gibbosa Penard 1890

●●●●● Netzelia

Ogden 1979

Test is rounded, with radial symmetry aperture is rounded and lobed.

  •  Netzelia oviformis

    Netzelia oviformis

  •  Netzelia oviformis

    Netzelia oviformis

Netzelia oviformis (Cash 1909) Ogden 1979
  •  Netzelia tuberculata

    Netzelia tuberculata

  •  Netzelia tuberculata

    Netzelia tuberculata

  •  Netzelia tuberculata

    Netzelia tuberculata

Netzelia tuberculata Wallich 1864

●●●●● Pyxidicula

Ehrenberg 1838

Shell bowl-shaped, rigid, areolate, organic. Aperture almost as wide as the cell.

  •  Pyxidicula patens

    Pyxidicula patens

  •  Pyxidicula patens

    Pyxidicula patens

Pyxidicula patens Claparède and Lachman 1858

●●●●● Trigonopyxis

Penard 1912

Aperture centric, irregular, frequently triangular, always surrounded by a ring of organic cement.

  •  Trigonopyxis arcula

    Trigonopyxis arcula

  •  Trigonopyxis arcula

    Trigonopyxis arcula

Trigonopyxis arcula (Leidy 1879) Penard 1912