Osedax fenrisi is a species of bone-eating worm in the family Siboglinidae, discovered on a whale carcass in the deep sea near Antarctica. This species is adapted to extreme environments, feeding on the lipids within whale bones through root-like structures that penetrate the bone. It relies on symbiotic bacteria housed in these root structures to metabolize the organic material. Named after the Norse god Fenrir, this species highlights the unique adaptations of deep-sea organisms to nutrient-limited habitats.
Animalia (Kingdom); Annelida (Phylum); Polychaeta (Class); Sedentaria (Subclass); Canalipalpata (Infraclass); Sabellida (Order); Siboglinidae (Family); Osedax (Genus); Osedax fenrisi (Species)
Osedax fenrisi Eilertsen, Dahlgren & Rapp, 2020
1. Eilertsen M H, Dahlgren T G, Rapp H T. A new species of Osedax (Siboglinidae: Annelida) from colonization experiments in the Arctic deep sea[J]. Frontiers in Marine Science, 2020, 7: 443. (Eilertsen et al., 2020)
Holotype female; preserved trunk 2.4 mm long, 0.3 mm wide; crown of palps 1.7 mm long. Pinnules long, some extending up to half the length of the palps, inserted dorsally, with a distal bulb or knob. Oviduct short, emerging from the rim of the trunk, extending between the base of the dorsal palps a quarter of the length of palps. Trunk with inconspicuous collar on anterior margin, thicker on the ventral side including a “bump”. No demarcation of upper and lower trunk. Live specimen with red palps. Color of trunk pale or white. Color of the collar not observed. Preserved specimens without pigmentation. Tube cylindrical and not very gelatinous. Root structure bulbous. Ovisac an ellipsoidal mass. Males not observed in 10 preserved specimens investigated with dissecting microscope.
named after the Fenris wolf, son of the Norse god Loki, for whom the vent field where the species was discovered is named
Aegirs Kilde Hydrothermal vent area, Arctic Mid-Oceanic Ridge 2340 m depth at 73.5671, 8.15881 (73 34' 01.6" N, 8 09' 31.70" E )
| Species | Phylum | Common Name | Ecosystem | Depth | Habitat | NCBI Taxonomy ID |
|---|---|---|---|---|---|---|
| Osedax fenrisi | Annelida | - | Hydrothermal vent | 2,316 | Aegirs Kilde Hydrothermal vent area, Arctic Mid-Oceanic Ridge | 2741452 |
| Genome Assembly | Genome Size | Assembly level | Released year | WGS accession | Submitter | BioProject | BUSCO completeness (%) | Scaffold/Contig N50 (kb) | GC content (%) | Repeat Rate (%) | Gene Number |
|---|---|---|---|---|---|---|---|---|---|---|---|
| wsOseFenr1.1 | 699.1Mb | Chromosome | 2024 | CAXHSG01 | WELLCOME SANGER INSTITUTE | PRJEB74226 | 90.10 | 99,500/1,900 | 27.5 | - | 19,023 |
| Gene ID | Description |
|---|---|
| ENSTGOP00000002813.1 | SOLUTE CARRIER FAMILY 35 |
| ENSTGOP00000002814.1 | DOUBLESEX AND MAB-3 RELATED TRANSCRIPTION FACTOR DMRT |
| ENSTGOP00000002815.1 | GCIP-INTERACTING PROTEIN P29 |
| ENSTGOP00000002817.1 | C2 DOMAIN-CONTAINING PROTEIN |
| ENSTGOP00000002818.1 | - |
| ENSTGOP00000002819.1 | NEGATIVE ELONGATION FACTOR COMPLEX MEMBER B |
| ENSTGOP00000002820.1 | SPHINGOMYELIN PHOSPHODIESTERASE |
| ENSTGOP00000002821.1 | - |
| ENSTGOP00000002822.1 | G-PROTEIN COUPLED RECEPTOR |
| ENSTGOP00000002823.1 | GCIP-INTERACTING PROTEIN P29 |
| ENSTGOP00000002825.1 | NEUROPEPTIDE Y RECEPTOR |
| ENSTGOP00000002826.1 | - |
| ENSTGOP00000002827.1 | PBS LYASE HEAT-LIKE PROTEIN |
| ENSTGOP00000002829.1 | G-PROTEIN COUPLED RECEPTOR |
| ENSTGOP00000002830.1 | INTEGRIN BETA-1-BINDING PROTEIN 1 |
| ENSTGOP00000002831.1 | GH08155P |
| ENSTGOP00000002832.1 | ADENINE NUCLEOTIDE ALPHA HYDROLASES-LIKE SUPERFAMILY PROTEIN |
| ENSTGOP00000002834.1 | HEAT SHOCK FACTOR BINDING PROTEIN 1 |
| ENSTGOP00000002835.1 | JMJC DOMAIN-CONTAINING HISTONE DEMETHYLATION PROTEIN |
| ENSTGOP00000002836.1 | 40S RIBOSOMAL PROTEIN S7 |
