Microworld

world of amoeboid organisms

Menu

homseniophora thomseni

Turriplaca thomseni (Roijackers and Siemensma, 1988) Nicholls, 2012
basionym Rabdiophrys thomseni Roijackers and Siemensma (1988)

Diagnosis: Cells covered by both plate- and spine-scales. The spine-scales are straight, completely bent or have a straight tubular part and a curved lamella. The plate-scales are oval in outline, with a diameter of 3.0-5.4 µm. The proximal plate is perforated by many minute pores; the distal plate has 6-9 holes and is fused to the proximal plate peripherally and by many internal ridges, forming hexagonal patterns of black dots as seen by TEM. The spine-scales are 2.4-6.1 µm long. They consist of a hollow tube, terminating proximally in several struts by which the tube is fused to the base plate, and distally in up to 6 teeth. There are, however, distally some extra holes in the tubular part of the spine-scale near to the struts, thus giving a much more complicated structure. The 2 middle spines at the apex of some spine-scales are very extended and reach about the same length as the shaft (2 µm); these 2 middle spines are fused by a very thin lamella, thus forming 2 circular holes, when seen from the top of the spine-scale. In other spine-scales a third spine is extended and fused to the two middle spines, giving 3 circular holes, when viewed from the top. Then there are spine-scales that have extremely variable structures at the 2 or 3 extended spines.

Remarks: The plate-scales are identical to those of Pinaciophora rubicunda. I have collected both species together. Turriplaca thomseni differs from R. denticulata in having very variable spine-scales with their apex divided into 2 or 3 holes.
T. thomseni was collected from algae along the southern coast of Sweden, between Mörrum and Karlshamn, August 1986. It is also known from brackish water in Denmark (Thomsen 1978: Fig. 15). The plate-scale, illustrated by Thomsen (1979, Fig. 53) and identified as P. denticulata, probably belongs to T. thomseni.

Recent posts

Foraminifer drome

Unknown species, collected from the river Drôme, France, 2021 Unknown species September 2021, I found three specimens of an agglutinated foraminifer in a sample collected

Read More »

Cyclopyxis spec

Cyclopyxis spec., 168 µm Cyclopyxis spec. Diagnosis: Shell circular in ventral and dorsal view, more or less hemispherical in lateral view (height/diameter ≈ 0.5); lateral

Read More »

Difflugia fallax

Difflugia fallax, from Penard, 1902 Difflugia fallax Penard, 1890 Diagnosis: Shell hyaline or yellowish-greenish, black at low magnification, round in cross section, formed of a

Read More »

Zivkovicia compressoidea

Z. compressoidea, a-b after Chardez, 1958; c after Jung, 1942 Zivkovicia compressoidea  (Jung, 1942) new.comb. Basionym: Pontigulasia compressoidea Jung, 1942 Diagnosis: Shell ovoid and compressed,

Read More »

Zivkovicia flexa

Z. flexa, from Cash and Hopkinson, 1909 Zivkovicia flexa  (Cash and Hopkinson, 1909) Ogden, 1983 Basionym: Pontigulasia compressa var. flexa  Cash and Hopkinson, 1909 Diagnosis:

Read More »

Lagenodifflugia epiouxi

L. epiouxi, after Chardez, 1984 3 Lagenodifflugia epiouxi (Chardez, 1983) new comb. Basionym: Pontigulasia epiouxi Chardez, 1983 Diagnosis: Shell elongate, circular in cross-section or very

Read More »

Centropyxis lapponica

Centropyxis lapponica, after Grospietsch, 1954 Centropyxis lapponica  Grospietsch, 1954 Diagnosis: Shell nearly circular in circumference, without spines. Aperture clear square with rounded corners. Shell viewed

Read More »

Chaos spec. 6

Chaos spec., Crailoo, 2021 Chaos spec. This specimen was found in a samples from Crailoo, Netherlands. It was remarkable because of the absence of crystals.

Read More »

Bullinularia maxima

Bullinularia maxima – from Bobrov and Mazei, 2020 Bullinularia maxima Bobrov et Mazei, 2020 Diagnosis: Shell brown, opaque, elliptical in ventral view; ventral surface is

Read More »