Table 1 Accession numbers (NCBI BioProject), classification, locality, sequencing and assembly statistics, and HaMStR ortholog recovery (out of 1031) for newly generated transcriptomes

Nematoda

PRJNA506144

Anaplectus granulosus, Plectidae, Plectida

Sweden, Stockholm city, soil (59.369243 N, 18.052779 E), ~50 individuals

PRJNA506149

Bathylaimus sp., Tripyloididae, Enoplida

Sweden, Gullmarn fjord, 53 m depth, mud (58° 15.73′ N, 11°26.10′ E), 19 individuals

PRJNA506150

Euchromadora sp., Chromadoridae, Chromadorida

Sweden, Gullmarn fjord, 53 m depth, mud (58° 15.73′ N, 11°26.10′ E), 39 individuals

PRJNA506153

Odontophora sp., Axonolaimidae, Araeolaimida

Sweden, Skagerrak near Hållö, 14–17 m depth, sand (58° 20.35′ N, 11° 12.70′ E), ~60 individuals

SRR8943407

Oncholaimidae gen. sp., Enoplida

Antarctica, Weddell Sea, 302 m depth (70° 53.52′ S, 11° 7.62′ W; PS96_163R), single individual

PRJNA506154

Pontonema sp., Oncholaimidae, Enoplida

Sweden, Skagerrak near Hållö, 14–17 m depth, sand (58° 20.35′ N, 11° 12.70′ E), one individual

PRJNA506156

Symplocostoma sp., Enchelidiidae, Enoplida

Sweden, Gullmarn fjord, 53 m depth, mud (58° 15.73′ N, 11°26.10′ E), 8 individuals

SRR8943408

Thoracostomopsidae gen. sp., Enoplida

Antarctica, Weddell Sea, 302 m depth (70° 53.52′ S, 11° 7.62′ W; PS96_156R), single individual

PRJNA506158

Tobrilus sp., Tobrilidae, Triplonchida

Sweden, Nacka, lake Källtorp, sandy sediment (59° 17.689′ N, 18° 09.608′ E), ~500 individuals

Nematomorpha

SRR8943410

Gordius sp.

USA, Virginia, Rockbridge County, pond (37° 46.74667′ N, 79° 29.78167′ W), piece of midbody of single individual

Kinorhyncha

SRR8943409

Pycnophyes sp.

Antarctica, Weddell Sea, 752.1 m depth (75° 51,14′ S, 032° 22,11′ W; PS96_1116R), single individual