world of amoeboid organisms

Menu
From Siemensma, 1991

Pterocystis pulchra (Dürrschmidt,1987 ) Siemensma, 1991

Diagnosis: Periplast, 20-30 µm. in diameter covered with 2 types of scales. Plate scales, 3.0-3.3 x 1.7-2.0 µm, are ovoid to ellipsoidal or sometimes asymmetrical. They are thin with deeply concave middle parts, elevated submarginal parts and slightly inflexed margins. They are patternless, the central ridge indicated only as a slightly darker line. The spine scales are rather numerous, 3.0-4.0 µm long, max. 3.1-3.8 µm broad, of almost funnel- or calyx-like appearance. The shaft is reduced to a dark narrow ridge, probably hollow, because of its less dense centre. The lateral wings are continued along the whole length of the shaft, reaching their maximum breadth in the middle distance of the scale. From here towards the proximal end they are closely anchylosed with the basal wing and, after considerable narrowing, form a patternless hollow stalk, which can be long and slender or short and stumpy, Distally the scales are of differing lengths; commonly the front parts are shorter and slightly curved outwards, and the rear parts straighter, reaching their max. length near the distal shaft end. The lateral wings are ornamented by thin deli­cate ribs, which run from the shaft to the outer margin transversally or obliquely. Ribs are also present on the front part of the calyx but here they run inwards from the outer margin.

Ecology: Type habitat: Swamp on the left-hand side of the southbound Pan American High­way, 42 km south of Puerto Montt, (1981)

Pterocystis pulchra, Rotes Wasser, Germany – Photomicrograph Eckhard Völker, Berlin
Pterocystis pulchra, Rotes Wasser, Germany – Photomicrograph Eckhard Völker, Berlin
Pterocystis pulchra, Rotes Wasser, Germany – Photomicrograph Eckhard Völker, Berlin
Pterocystis pulchra>, Rotes Wasser, Germany – Photomicrograph Eckhard Völker, Berlin
Recent posts

Cyclopyxis magna

Cyclopyxis magna – from Stepanek, 1967 Cyclopyxis magna Stepanek, 1967 Diagnosis: Test relatively high, covered with large mineral grains. The edge of the pseudostome is

Read More »

Cyclopyxis marinus

Cyclopyxis marinus – from Decloitre, 1977 Cyclopyxis marinus Decloitre, 1977 Diagnosis: Compared to Cyclopyxis aplanata the pseudostome is very minimally invaginated. It is surrounded by

Read More »

Cyclopyxis triangularistoma

Cyclopyxis triangularistoma – from Decloitre, 1980 Cyclopyxis triangularistoma Decloitre, 1980 Diagnosis: Ventral side exclusively covered with very small mineral grains, giving it a pearled appearance.

Read More »

Cyclopyxis pirini

Cyclopyxis pirini – from Golemansky 1974 Cyclopyxis pirini Golemansky 1974 Diagnosis: Ventrally, the test is circular. Laterally, the test is low hemispherical with a more

Read More »

Cyclopyxis eurystoma alta

C. eurystoma f. alta, after Jung, 1942 Cyclopyxis eurystoma f. alta  Jung, 1942 Diagnosis:  Test and coverage as the type. However, the side profile is

Read More »

Cyclopyxis kahli crucigenia

C. kahli var. crucigenia, after Stepanek, 1963 Cyclopyxis kahli var. crucigenia  Stepanek, 1963 Diagnosis:  This variety differs from the type by a small and highly

Read More »