The scaly-foot gastropod Chrysomallon squamiferum is a species of deep-sea hydrothermal-vent snail, a marine gastropod mollusc in the family Peltospiridae. This vent-endemic gastropod is known only from deep-sea hydrothermal vents in the Indian Ocean, where it has been found at depths of about 2,400–2,900 m. It differs greatly from other deep-sea gastropods, even the closely related neomphalines. It is widely distributed in the deep-sea hydrothermal vents of the Indian Ocean, which are around 2,780 metres in depth.
Animalia (Kingdom); Mollusca (Phylum); Gastropoda (Class); Vetigastropoda (Subclass); Neomphalida (Order); Neomphaloidea (Superfamily); Peltospiridae (Family); Chrysomallon (Genus); Chrysomallon squamiferum (Species)
Chrysomallon squamiferum C. Chen, K. Linse, Copley & A. D. Rogers, 2015
1. Chen C, Linse K, Copley J T, et al. The ‘scaly-foot gastropod’: a new genus and species of hydrothermal vent-endemic gastropod (Neomphalina: Peltospiridae) from the Indian Ocean[J]. Journal of Molluscan Studies, 2015, 81(3): 322-334. (Chen et al., 2015)
Shell. Three whorls, globose with depressed spire, tightly coiled. Milky white, thin. Aperture ellip- tic, very large. Shape between neritiform and limpet-form. Surface sculptured with subtle, closely-spaced ribs. Fine growth lines present. Periostracum thick, brown, envelopes shell edge. Exterior often coated by a black layer of iron sulphide. Columellar region covered by thin callus. Average shell diameter 32 mm for adults (100 specimens), maximum shell diameter 45.5 mm. Protoconch not seen.
squamiferum (Latin) meaning scale-bearing, referring to the numerous hard sclerites covering the foot. Used as an adjective
Known from the following three hydrothermal vent fields in the Indian Ocean, found on active black smokers as well as on diffuse flow sites. Longqi vent field (37847.0270S 49838.9630E), SWIR, around 2,780 m depth; Kairei vent field (25819.239S, 70802.429E), Central Indian Ridge, depth 2,415 to 2,460 m (Van Dover et al., 2001); and Solitaire vent field (19833.413S, 65850.888E), Central Indian Ridge, depth 2,606 m (Nakamura et al., 2012).
| Species | Phylum | Common Name | Ecosystem | Depth | Habitat | NCBI Taxonomy ID |
|---|---|---|---|---|---|---|
| Chrysomallon squamiferum | Mollusca | Scaly-foot Snail | Hydrothermal vent | 2,415-2,785 | Kairei hydrothermal vent field (25°19.23ʹS, 70°02.42ʹE) | 216257 |
| Genome Assembly | Genome Size | Assembly level | Released year | WGS accession | Submitter | BioProject | BUSCO completeness (%) | Scaffold/Contig N50 (kb) | GC content (%) | Repeat Rate (%) | Gene Number |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Csq_v1.1.fa | 404.6Mb | Chromosome | 2020 | SMMR01 | Hong Kong University of Science and Technology | PRJNA523081 | 96.60 | 30,198/1,883 | 29.82 | 25.22 | 16,917 |
| Title | Journal | Pubmed ID |
|---|---|---|
| The Scaly-foot Snail genome and implications for the origins of biomineralised armour | nature communications | 32269225 |
| Gene ID | Description |
|---|---|
| CsqKR_Scaf256_2.14 | N-ACETYLGALACTOSAMINYLTRANSFERASE |
| CsqKR_Scaf256_2.16 | SERINE PROTEASE FAMILY S10 SERINE CARBOXYPEPTIDASE |
| CsqKR_Scaf256_2.22 | CYCLIC AMP RESPONSE ELEMENT-BINDING PROTEIN B |
| CsqKR_Scaf256_2.34 | - |
| CsqKR_Scaf256_3.1 | - |
| CsqKR_Scaf256_3.11 | ETS |
| CsqKR_Scaf256_3.12 | - |
| CsqKR_Scaf256_3.13 | SHORT-CHAIN DEHYDROGENASE/REDUCTASE |
| CsqKR_Scaf256_3.14 | - |
| CsqKR_Scaf256_3.16 | TETRASPANIN |
| CsqKR_Scaf256_4.17 | MEDIATOR OF RNA POLYMERASE II TRANSCRIPTION SUBUNIT 25 |
| CsqKR_Scaf256_4.22 | PAX6 NEIGHBOR PROTEIN PAXNEB |
| CsqKR_Scaf256_4.23 | NADH-CYTOCHROME B5 REDUCTASE |
| CsqKR_Scaf256_4.31 | PROTEIN-TYROSINE-PHOSPHATASE |
| CsqKR_Scaf256_4.32 | F-BOX ONLY PROTEIN 47 |
| CsqKR_Scaf256_5.0 | - |
| CsqKR_Scaf256_5.17 | OPSIN |
| CsqKR_Scaf256_5.18 | ETS |
| CsqKR_Scaf256_5.26 | SORTING NEXIN |
| CsqKR_Scaf256_5.29 | ATP-DEPENDENT PERMEASE MDL1, MITOCHONDRIAL |
