Homogammina sp.

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 : 178

Homogammina sp.

Supplementary Fig. S8

Homogammina sp. Gooday et al. 2017, Supplementary Fig. 7c .

‘Mud xenophyophore’ Gooday and Wawrzyniak-Wydrowska 2023, Fig. 6C , Supplementary Fig. S16C, D.

Material examined. Box core 034. Specimen RC1494 (morphology only). Box core 034. Specimen RC1495 (stercomare only). Box core 040. Specimen RC1700 (stercomare only).

This species is represented by at least 7 fragments, the largest of which is roughly rectangular and may be largely intact (Supplementary Fig. S8A ). It measures 22.8 mm long, 15.4 mm wide and 2.9 to 4.9 mm thick. The test is light brownish and consists of fine-grained sediment (‘mud’). Much of the surface, which appears to be undamaged, is slightly undulating but otherwise featureless. However, the sides are abraided and expose the test interior. This is homogeneous except for being ramified by black stercomare branches, generally 67–110 µm wide, which stand out clearly against much lighter-coloured test material. The only other feature of note is a domed komokiacean, measuring 3.70 mm wide and 3.20 mm high, attached to one side of the test. It is densely covered with grey dots, presumably stercomata-filled chambers.

The stercomare is more resilient to damage than the test and sometimes found as strands, to which cling small amount fine coherent ‘mud’, the remains of test material. Two examples are illustrated in Supplementary Fig. S8D, E , one of them from the same box core (BC034) as the main test fragment. The stercomare branches are somewhat crooked and of distinctly uneven width, with wider sections sometimes separated by narrow necks (particularly in RC 1495). They branch frequently with occasional anastomoses and with some branches ending blindly. A scale is only available for photographs of specimen RC 1700 in which the branches range from 38 to 75 µm wide, occasionally up to ~100 µm.

Remarks. This species is probably the same as Homogammina sp. of Gooday et al. (2017a) from the UK-1 license area and ‘Mud xenophyophore’ of Gooday and Wawrzyniak-Wydrowska (2023) from InterOcean Metal (IOM) license area. These specimens were also ramified by dark grey stercomare branches.

Figures

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.

FIGURE 7. Abyssalia aff. foliformis, laboratory photographs; Specimen RC0615 (BC011). A, Fragment. B, Detail of edge. C–D, Broken edge showing granellare embedded in dak stercomare masses.

FIGURE 8. Claraclippia seminuda Gooday & Holzmann gen. & sp. nov., shipboard photographs; holotype, RC0202 (BC005). A, B, Test photographed on the surface of the box core immediately after collection. C, D, Test removed from box core. E, F, Details of test; note the small open spaces.Arrows indicate the same feature in A–D; asterisk indicate point of attachment. Scales are not available for B and C.