Raphidiophrys ovalis (Dürrschmidt, 1985) Siemensma and Roijackers, 1988

Diagnosis: scales ovate, with inflected, sharp-edged, narrow rims; scale size 6.4-12.7 X 3.0-6.4 µm, with a L/B-ratio of 1.4-2.3; number of septa along the border varying from 65-70 per 10 µm.
The size of the scales is larger than the type, but this species shows a large variation in scale size within a specimen (Nicholls and Dürrschmidt 1985; Fig. 45). Calculations derived from that photomicrograph showed a range between 4.4 and 9.0 µm. The shape and structure of the scales in my specimens resemble closely that of the type.
The upper plate of the scale is very fragile and sensitive to drying. Notwithstanding the weight of other scales, they easily collapse or split along the septa.
Scales of R. ovalis were published by Siemensma (1981) under name of R. intermedia and were considered by Nicholls and Dürrschmidt (1985) to belong to a subspecies of R. orbicularis elegans. The distinctly ovate shape and the fragile structure of these scales, strongly different from all other known Raphidiophrys, justify the recognition at species level.

Recent posts

Centropyxiella arenaria

  Centropyxiella arenaria , after Valkanov, 1970   Centropyxiella arenaria  Valkanov, 1970 Diagnosis: Test with almost parallel sides, covered with mineral grains; length varying strongly,

Read More »

Centropyxiella

  Genus Centropyxiella  Valkanov, 1970 Diagnosis: Test with plagiostome, embedded with xenosomes. Border of the pseudostome bent outwardly, in contrary to Centropyxis where the border

Read More »

Centropyxis armata

  Centropyxis armata, after Van Oye, 1952   Centropyxis armata  (Van Oye, 1952) n. comb.Basionym: Cyclopyxis armata Van Oye, 1952 Diagnosis: Test chitinoid, with relatively long

Read More »

Archerella elliptica

  Archerella elliptica, after Van Oye, 1956   Archerella elliptica  (Decloitre, 1974) n. comb.Basionym: Ditrema elliptica Decloitre, 1974   Diagnosis: Test elliptical with two apertures. Dimensions:

Read More »

Archerella jollyi

  Archerella jollyi, after Van Oye, 1956   Archerella jollyi  (Van Oye, 1956) n. comb.Basionym: Amphitrema jollyi Van Oye, 1956   Diagnosis: This species differs

Read More »