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 3. Megastygarctides hekatae sp. nov. measurements of selected morphological structures. SMF 1482 measured before SEM. Numbers are given in micrometres (µm). Abbreviations: na — data not available.

	Holotype	Paratype
specimen	slide	SEM stub
code	SMF 1484	SMF 1482
sex	female	female
Body length	193.3	185.6
Body width	na	42.3
Median cirrus	28.0	27.9
Internal cirri	23.3	18.9
External cirri	36.3	na
Cirri A	28.6	31.8
Primary clavae	17.0	17.9
Secondary clavae	24.5	20.1
Cirri E	64.5	61.0
Leg IV sensory organ	3.6	4.3
Leg I claws	16.5	14.4
Leg II claws	14.5	13.9
Leg III claws	14.0	14.0
Leg IV claws	19.5	18.7
Anus- - gonopore	13.0	17.0