Psammina aff. limbata, Kamenskaya, Gooday & Tendal, 2015

Holzmann, Maria, Barrenechea-Angeles, Inés, Lim, Swee-Cheng & Pawlowski, Jan, 2024, New xenophyophores (Foraminifera, Monothalamea) from the eastern Clarion-Clipperton Zone (equatorial Pacific), Zootaxa 5419 (2), pp. 151-188 : 177

Psammina aff. limbata form 1 sensu Gooday et al. 2018

Supplementary Fig. S6

Psammina aff. limbata form 1. Gooday et al., 2018, 930–934, Figs 3–5 , Supplementary Fig. S1C–F .

Material examined. Box core 040. Specimen RC1699 (morphology). Box core 036. Specimen RC1588 (morphology). Dried.

Remarks. RC1677 ( Fig. 6A, B ). The specimen includes only the upper fan-shaped part of the test, which has broken off near the top of the stalk. The fan is ~ 11 mm and whole fragment is 8.4 mm high. There is a very obvious pale rim, devoid of the stercomare that occupy the remainder of the test. The specimen is undoubtedly the same as the form described by Gooday et al. (2018), particularly in terms of the agglutinated particles, which includes numerous agglutinated foraminifera, many of them orange in colour. This form is probably the same as Psammina limbata from the Russian license area, although this cannot be confirmed in the absence of genetic data for any of the Russian specimens.

RC1558 ( Fig. 6C–F ). The specimen was dried soon after collection and is greyish-brown in overall colour. The upper part is fan shaped, gently curved, and somewhat asymmetrical, merging into the stalk on one side and joining it more abruptly and at a higher point on the other side. The maximum width is 25.7 mm and the overall height 22.4 mm, of which ~ 5.9 mm is occupied by the stalk and ~ 16.6 mm by the fan. The fan-like part is 1.80–2.06 mm thick. The stalk is strongly tapered, from about 5.88 mm to 1.56 mm. The bases of several rod-like ‘roots’ arise from the lower part of the fan and the top of the stalk, 5 on one side, 2 on the other.

The test surface is fairly smooth, apart from clearly-developed, concentrically zoned undulations. The wall comprises a matrix of small mineral grains and tiny spicule fragments in which are embedded radiolarians, a few longer spicules and occasional agglutinated foraminiferan tests and larger mineral grains. The margin of the fan is abraided, exposing the interior, which comprises an open meshwork of spicules to which are attached radiolarians. The test wall is very thin, around 40–60 µm.

Figures

FIGURE 1. PhyML phylogenetic tree based on the 3'end fragment of the SSU rRNA gene, showing the evolutionary relationships of 79 foraminiferal sequences belonging to monothalamids. Specimens marked in bold indicate those for which sequences were acquired during the present study. The tree is unrooted. Specimens are identified by their accession numbers. Numbers at nodes indicate bootstrap values (BVs). Only BVs>70% are shown.

FIGURE 3. Aschemonella tani Gooday & Holzmann sp. nov.; holotype RC1555 (BC036). A, Shipboard photograph showing grouping of structures on nodule summit; numbers 1–3 identify parts illustrated in other photographs. B–F, Laboratory photographs. B, Part 1 from top of nodule. C, Part 2. D, E, Part 3 viewed from different sides. F, Detail of Part 3.

FIGURE 4. Aschemonella tani Gooday & Holzmann sp. nov., laboratory photographs of fragments from holotype; RC1555 (BC036). A, Detail of Part 1 from summit of nodule showing dark stercomare seen through wall of test. B, Part 2 broken open to expose stercomare. C, Detail of stercomare in Part 2. D, Granellare strands.

FIGURE 5. Abyssalia foliformis Gooday & Holzmann 2020; RC0612 (BC015). A, Shipboard photograph of unique test fragment. B–F, Laboratory photographs of test fragment; the stercomare had been lost from the central part of the fragment. C, D, Details of fragment showing granellare. E, Fragments of cytoplasm detached from test; note that the fragments are partly attached to sponge spicules. F, Loose stercomare pellets that had fallen out of the test.

FIGURE 6. Abyssalia aff. foliformis, shipboard photographs; RC0615 (BC011).A, B, Two different side views. C, Test viewed from above. D–F, Details of test; the yellow tube in E is probably part of a Saccorhiza ramosa test.