Marine tardigrades (Heterotardigrada) from Senghor Seamount, Eastern Tropical Atlantic, with the description of two new species from the taxon Stygarctidae Author Trokhymchuk, Roman Ruslanovych 0000-0001-9570-0226 Naturalis Biodiversity Center, Darwinweg 2, 2333 CR, Leiden, Netherlands & German Centre for Marine Biodiversity Research, Senckenberg am Meer, Südstrand 44, 26382, Wilhelmshaven, Germany Author Hansen, Jesper Guldberg 0000-0003-0054-0237 Natural History Museum of Denmark, University of Copenhagen, Universitetsparken 15, 2100, Copenhagen, Denmark Author Pysarenko, Uliana https://orcid.org/0009-0001-1775-5050 V. N. Karazin Kharkiv National University, Svobody Square 4, 61022, Kharkiv, Ukraine Author Subota, Kateryna https://orcid.org/0009-0001-3747-2373 V. N. Karazin Kharkiv National University, Svobody Square 4, 61022, Kharkiv, Ukraine Author Kieneke, Alexander 0000-0001-8180-2483 German Centre for Marine Biodiversity Research, Senckenberg am Meer, Südstrand 44, 26382, Wilhelmshaven, Germany text ZooKeys 2026 2026-10-27 1295 333 358 journal article 316776 10.3897/zookeys.1295.205902 0c78ef06-3b49-4690-99d8-fe5d940fc1ec CF6C5701-4EFD-4B84-800B-0A377DEB79D3

Table 4. Parastygarctus potercha sp. nov. measurements of selected morphological structures. Numbers are given in micrometers (µm). Abbreviations: Min — minimum value, na — data not available, SD — standard deviation.

	Holotype	Paratype	Paratype	Paratype	Paratype	Paratype	Paratype	Paratype	Paratype	Paratype	Paratype	Paratype	Mean	SD	Min
specimen	slide	slide	slide	slide	slide	slide	digital	slide	SEM stub	slide	slide	slide
code	SMF 1493	SMF 1494	SMF 1427	SMF 1490	SMF 1496	SMF 1541	SMF 1604	SMF 1453	SMF 1483	SMF 1491	SMF 1492	SMF 1495
sex	female	female	male	male	undetermined	undetermined	undetermined	juvenile	juvenile	juvenile	juvenile	juvenile
Body length	69.0	70.0	85.3	89.3	65.0	52.5	78.0	64.0	76.7	74.0	69.0	52.7	70, 5	11, 3	52, 5
Body width	21.0	18.0	22.3	22.3	na	na	na	17.3	20.3	18.0	17.5	14.0	19, 0	2, 7	14
Median cirrus	8.5	9.3	9.0	9.0	6.7	10.0	8.0	na	10.8	6.0	10.0	10.0	8, 8	1, 5	6
Internal cirri	7.0	7.0	11.0	10.3	na	5.0	na	7.0	8.6	7.0	na	6.0	7, 7	2, 0	5
External cirri	10.5	9.7	9.5	9.0	6.7	6.0	na	11.0	10.9	8.3	7.0	7.3	8, 7	1, 8	6
Cirri A	9.8	13.0	13.0	11.8	7.5	7.8	na	9.6	12, 7	8.3	9.6	11.0	10, 4	2, 1	7, 5
Primary clavae	4.7	5.0	6.3	4.5	4.5	3.0	na	5.0	5.2	4.3	5.0	4.5	4, 7	0, 8	3
Secondary clavae	4.0	4.2	6.0	4.3	2.5	3.0	na	4.3	4.8	3.3	na	2.7	3, 9	1, 1	2, 5
Cirri E	23.0	28.5	18.5	20.5	22.0	19.7	27.3	24.5	21.1	18.5	21.3	15.5	21, 7	3, 7	15, 5
Leg IV sensory organ	1.7	2.0	2.3	2.0	1.5	1.5	na	na	na	1.5	1.5	1.5	1, 7	0, 3	1, 5
Leg I claws	5.5	4.7	6.3	6.8	5.2	5.3	na	6.3	5.5	4.5	na	5.2	5, 5	0, 7	4, 5
Leg II claws	4.5	4.3	5.3	5.0	5.0	4.7	na	na	5.5	4.0	na	4.3	4, 7	0, 5	4
Leg III claws	4.0	4.2	4.3	5.0	5.0	4.7	na	4.6	5.6	3.3	3.7	4.5	4, 4	0, 6	3, 3
Leg IV claws	6.5	7.5	7.0	8.0	5.8	6.7	na	4.5	7.0	5.0	5.7	6.5	6, 4	1, 0	4, 5
Anus – gonopore	6.0	5.7	2.5	2.5	na	na	na	na	na	na	2.0	na	3, 7	1, 9	2