world of amoeboid organisms

Menu
Pterocystis paliformis
From Siemensma, 1991

Pterocystis paliformis (Dürrschmidt, 1987) Siemensma, 1991

Diagnosis: Periplast 8-15 µm in diameter (measurement based on whole mount); details of protoplast unknown. Scales of two types. The spine scales are almost spade-form, 4.5 µm long and max. 2.3 µm breadth. The shaft is reduced to a short hollow ridge of varying breadth, ending distally with a blunt apex. The lateral wings and the basal wing are narrow rimmed and joined to the spade-like form of the spine scales. The wings on either side of the shaft run almost parallel to it but then narrow abruptly and terminate sub-apically. The area around the “shaft base” is depressed to a concavity. The plate scales, 2.5 X 1.5 µm, are elliptical or ovoid. The scales are thin and narrow- rimmed. The central swelling is rudimentarily developed and slightly shifted to the smaller pole of the scale.

Remarks: A. paliformis is conspicuous by virtue of the remarkable similarity between the plate and spine scales. It appears that the structure, which forms the shaft in the spine scales might be identical with the central swelling in the plate scales. Other corresponding points are the concave depression at the basal end of the shaft and the way the width of the shaft and the central swelling varies in both scale types.

Distribution: Chile, New Zealand.

Recent posts

Cyclopyxis arenata

Cyclopyxis arenata – after Boltovskoy and Lena, 1966 Cyclopyxis arenata (Cushman, 1930) Boltovskoy, 1956 Basionym: Pseudarcella arenata Cushman, 1930 Diagnosis: Hemispherical shell. Convex dorsal side,

Read More »

Cyclopyxis overview 2

C. impressa C. impressa C. stellata C. stellata C. crucistoma C. crucistoma C. crucigenia C. crucigenia C. grospietschi C. grospietschi C. triquestrus C. triquestrus C.

Read More »

Cyclopyxis profundistoma

Cyclopyxis profundistoma – from Kufferath, 1932 Cyclopyxis profundistoma Kufferath, 1932 Diagnosis: The yellowish grey colored test is made of coarser mineral particles, which are connected

Read More »

Cyclopyxis maynei

Cyclopyxis maynei – from Kufferath, 1932 Cyclopyxis maynei Kufferath, 1932 Diagnosis: Test cylindrical, characterized by the size of the aperture, which is 87-97 μm wide

Read More »

Cyclopyxis kahli obliqua

C. kahli var. obliqua , after Decloitre, 1978 Cyclopyxis kahli var. obliqua   Decloitre, 1978 Diagnosis:  Test with all the characteristics of the type species

Read More »