C. Chen @ Jamsteeeec
@squamiferum.bsky.social
Deep-sea biologist / Malacologist @JAMSTEC and @Senckenberg. Chemosynthesis-based ecosystems. 海洋生物学者・深海・軟体動物・化学合成生態系。
Website: https://squamiferum.net
See the collection: https://www.conchology.be/?t=92
Website: https://squamiferum.net
See the collection: https://www.conchology.be/?t=92
[New Paper] Two shrimp species, Rimicaris loihi and R. cambonae, live side by side at hydrothermal vents — yet remain genetically distinct. Our genomic data and decadal sampling reveal insights on their demography and speciation!
Out now in Molecular Ecology, OPEN ACCESS: doi.org/10.1111/mec....
Out now in Molecular Ecology, OPEN ACCESS: doi.org/10.1111/mec....
October 11, 2025 at 12:14 PM
[New Paper] Two shrimp species, Rimicaris loihi and R. cambonae, live side by side at hydrothermal vents — yet remain genetically distinct. Our genomic data and decadal sampling reveal insights on their demography and speciation!
Out now in Molecular Ecology, OPEN ACCESS: doi.org/10.1111/mec....
Out now in Molecular Ecology, OPEN ACCESS: doi.org/10.1111/mec....
[New Paper] names Chaetoderma naga, a gigantic (>13 cm) new worm-mollusc from a cold seep! Like its sister-species C. shenloong, it probably relies on endosymbiotic bacteria for energy. We named it after Nāga, a snake-god from Asian mythologies!
Out now in Moll. Res., LINK: doi.org/10.1080/1323...
Out now in Moll. Res., LINK: doi.org/10.1080/1323...
October 10, 2025 at 4:20 PM
[New Paper] names Chaetoderma naga, a gigantic (>13 cm) new worm-mollusc from a cold seep! Like its sister-species C. shenloong, it probably relies on endosymbiotic bacteria for energy. We named it after Nāga, a snake-god from Asian mythologies!
Out now in Moll. Res., LINK: doi.org/10.1080/1323...
Out now in Moll. Res., LINK: doi.org/10.1080/1323...
[New Paper] in Zootaxa names new genus Lobatoradarea in the amphipod family Calliopiidae, with 10 new species found across a wide range of marine habitats from shallow subtidal waters to a deep-sea hydrothermal vent!
Link to the paper: mapress.com/zt/article/v...
Link to the paper: mapress.com/zt/article/v...
October 2, 2025 at 1:02 AM
[New Paper] in Zootaxa names new genus Lobatoradarea in the amphipod family Calliopiidae, with 10 new species found across a wide range of marine habitats from shallow subtidal waters to a deep-sea hydrothermal vent!
Link to the paper: mapress.com/zt/article/v...
Link to the paper: mapress.com/zt/article/v...
We disembarked from research vessel R/V YOKOSUKA in #Chichijima Island, #Bonin ( #Ogasawara ) Islands! The only way back to the main island of Japan is by a biweekly 24-hours ferry trip, so we got a couple days to see the islands!
October 1, 2025 at 1:42 PM
We disembarked from research vessel R/V YOKOSUKA in #Chichijima Island, #Bonin ( #Ogasawara ) Islands! The only way back to the main island of Japan is by a biweekly 24-hours ferry trip, so we got a couple days to see the islands!
[New Paper] Names Pyropelta artemis, a new deep-sea limpet from the Off Hatsushima seep in Japan! This species 'shape-shifts' its shell to fit the substrate shape, which we likened to the moon's waxing and waning.
Just out in Contributions to Zoology, OPEN ACCESS: brill.com/view/journal...
Just out in Contributions to Zoology, OPEN ACCESS: brill.com/view/journal...
September 27, 2025 at 6:46 AM
[New Paper] Names Pyropelta artemis, a new deep-sea limpet from the Off Hatsushima seep in Japan! This species 'shape-shifts' its shell to fit the substrate shape, which we likened to the moon's waxing and waning.
Just out in Contributions to Zoology, OPEN ACCESS: brill.com/view/journal...
Just out in Contributions to Zoology, OPEN ACCESS: brill.com/view/journal...
Rare shots of JAMSTEC deep-sea research vessels: recovering HOV SHINKAI 6500 with the drilling vessel CHIKYU in the background!
Suruga Bay, Japan.
Suruga Bay, Japan.
September 26, 2025 at 1:09 AM
Rare shots of JAMSTEC deep-sea research vessels: recovering HOV SHINKAI 6500 with the drilling vessel CHIKYU in the background!
Suruga Bay, Japan.
Suruga Bay, Japan.
[New Paper] We found a SECOND SNAIL with HARD SCALES on the foot -- Ifremeria nautilei lives in deep-sea hot vents and makes chitinous scales not by secretion but by cell differentiation, like our own skin!
@royalsocietypublishing.org Proceedings B, OPEN ACCESS: doi.org/10.1098/rspb...
@royalsocietypublishing.org Proceedings B, OPEN ACCESS: doi.org/10.1098/rspb...
August 27, 2025 at 4:08 AM
[New Paper] We found a SECOND SNAIL with HARD SCALES on the foot -- Ifremeria nautilei lives in deep-sea hot vents and makes chitinous scales not by secretion but by cell differentiation, like our own skin!
@royalsocietypublishing.org Proceedings B, OPEN ACCESS: doi.org/10.1098/rspb...
@royalsocietypublishing.org Proceedings B, OPEN ACCESS: doi.org/10.1098/rspb...
[New Paper] in @zse.pensoft.net names Bathylepeta wadatsumi, the world’s DEEPEST true limpet from 6 km deep! Giant sized (4 cm) for this depth, we named it after the god of sea in Japan & also the Large Monk “Wadatsumi” from the manga series ONE PIECE!
OPEN ACCESS: doi.org/10.3897/zse....
OPEN ACCESS: doi.org/10.3897/zse....
July 25, 2025 at 1:15 AM
[New Paper] in @zse.pensoft.net names Bathylepeta wadatsumi, the world’s DEEPEST true limpet from 6 km deep! Giant sized (4 cm) for this depth, we named it after the god of sea in Japan & also the Large Monk “Wadatsumi” from the manga series ONE PIECE!
OPEN ACCESS: doi.org/10.3897/zse....
OPEN ACCESS: doi.org/10.3897/zse....
[New Paper] in European J of Taxonomy names 1 new genus and 3 new species of XENOPHYOPHORES -- giant single-celled foraminifera! We integrate in situ imagery, dissection, SEM, micro-CT, and molecular phylogeny for unprecedentedly detailed descriptions for xenos.
OPEN ACCESS: doi.org/10.5852/ejt....
OPEN ACCESS: doi.org/10.5852/ejt....
July 24, 2025 at 7:19 AM
[New Paper] in European J of Taxonomy names 1 new genus and 3 new species of XENOPHYOPHORES -- giant single-celled foraminifera! We integrate in situ imagery, dissection, SEM, micro-CT, and molecular phylogeny for unprecedentedly detailed descriptions for xenos.
OPEN ACCESS: doi.org/10.5852/ejt....
OPEN ACCESS: doi.org/10.5852/ejt....
[New Paper] Reveals 4 distinct metapopulations in the hot vent mussel Bathymodiolus septemdierum found across the Indo-W Pacific! With implications for conservation in the face of upcoming deep-sea mining.
Out now in Journal of Biogeography, OPEN ACCESS: doi.org/10.1111/jbi....
Out now in Journal of Biogeography, OPEN ACCESS: doi.org/10.1111/jbi....
July 19, 2025 at 11:16 AM
[New Paper] Reveals 4 distinct metapopulations in the hot vent mussel Bathymodiolus septemdierum found across the Indo-W Pacific! With implications for conservation in the face of upcoming deep-sea mining.
Out now in Journal of Biogeography, OPEN ACCESS: doi.org/10.1111/jbi....
Out now in Journal of Biogeography, OPEN ACCESS: doi.org/10.1111/jbi....
[New Paper] reporting 8 distinct mollusc eggs from abyssal and hadal depths of Aleutian Trench is now out in Progress in Oceanography! With a potential Dumbo Octopus egg + at least 5 snail eggs!
OPEN ACCESS: www.sciencedirect.com/science/arti...
With @sigwartae.bsky.social @oceanspecies.bsky.social
OPEN ACCESS: www.sciencedirect.com/science/arti...
With @sigwartae.bsky.social @oceanspecies.bsky.social
July 13, 2025 at 4:53 PM
[New Paper] reporting 8 distinct mollusc eggs from abyssal and hadal depths of Aleutian Trench is now out in Progress in Oceanography! With a potential Dumbo Octopus egg + at least 5 snail eggs!
OPEN ACCESS: www.sciencedirect.com/science/arti...
With @sigwartae.bsky.social @oceanspecies.bsky.social
OPEN ACCESS: www.sciencedirect.com/science/arti...
With @sigwartae.bsky.social @oceanspecies.bsky.social
[New Paper] Uses phylogenomics to resolve how deep-sea symbiotic vesicomyid clams evolved to conquer the abyss; revising some the genus-level taxonomy along the way!
Just out in the journal Cladistics, read for FREE here: onlinelibrary.wiley.com/share/author...
Just out in the journal Cladistics, read for FREE here: onlinelibrary.wiley.com/share/author...
June 24, 2025 at 9:04 AM
[New Paper] Uses phylogenomics to resolve how deep-sea symbiotic vesicomyid clams evolved to conquer the abyss; revising some the genus-level taxonomy along the way!
Just out in the journal Cladistics, read for FREE here: onlinelibrary.wiley.com/share/author...
Just out in the journal Cladistics, read for FREE here: onlinelibrary.wiley.com/share/author...
[New Paper] @zoojlinnsoc.bsky.social reports three capitellid polychaetes from Indian Ocean deep-sea hot vents, two of them described as new species! Phylogenetic analysis reveals two independent origins of capitellids in chemosynthetic ecosystems.
FREE ACCESS: academic.oup.com/zoolinnean/a...
FREE ACCESS: academic.oup.com/zoolinnean/a...
June 16, 2025 at 9:34 AM
[New Paper] @zoojlinnsoc.bsky.social reports three capitellid polychaetes from Indian Ocean deep-sea hot vents, two of them described as new species! Phylogenetic analysis reveals two independent origins of capitellids in chemosynthetic ecosystems.
FREE ACCESS: academic.oup.com/zoolinnean/a...
FREE ACCESS: academic.oup.com/zoolinnean/a...
[New Paper] in The Nautilus names Naquetia confusa, a new species of muricid snail from Palawan, Philippines! It was previously confused with the morphologically similar N. vokesae from the Indian Ocean.
Read the paper: www.researchgate.net/publication/...
Read the paper: www.researchgate.net/publication/...
June 10, 2025 at 11:35 PM
[New Paper] in The Nautilus names Naquetia confusa, a new species of muricid snail from Palawan, Philippines! It was previously confused with the morphologically similar N. vokesae from the Indian Ocean.
Read the paper: www.researchgate.net/publication/...
Read the paper: www.researchgate.net/publication/...
[New Paper] @zoojlinnsoc.bsky.social presents 2 NEW deep-sea vent snails from Atlantic! Being giants for their genera, they're named after the giants "Gargantua and Pantagruel" in François Rabelais' novels. Peltospira gargantua is likely to have symbionts!
OPEN ACCESS: doi.org/10.1093/zool...
OPEN ACCESS: doi.org/10.1093/zool...
June 6, 2025 at 2:08 AM
[New Paper] @zoojlinnsoc.bsky.social presents 2 NEW deep-sea vent snails from Atlantic! Being giants for their genera, they're named after the giants "Gargantua and Pantagruel" in François Rabelais' novels. Peltospira gargantua is likely to have symbionts!
OPEN ACCESS: doi.org/10.1093/zool...
OPEN ACCESS: doi.org/10.1093/zool...
April 4, 2025 at 10:53 PM
The Divine Dragon Glistenworm (Chaetoderma shenloong) we named is one of the TOP-TEN MARINE SPECIES OF 2024 @WRMarineSpecies !! It is actually a wormy mollusc from methane seeps, and uses a new organelle “dracosphera” (“Dragon Ball”) to house symbiotic bacteria!
Our paper: doi.org/10.3897/zse....
Our paper: doi.org/10.3897/zse....
March 19, 2025 at 1:06 AM
The Divine Dragon Glistenworm (Chaetoderma shenloong) we named is one of the TOP-TEN MARINE SPECIES OF 2024 @WRMarineSpecies !! It is actually a wormy mollusc from methane seeps, and uses a new organelle “dracosphera” (“Dragon Ball”) to house symbiotic bacteria!
Our paper: doi.org/10.3897/zse....
Our paper: doi.org/10.3897/zse....
[New Paper] in Ecology reveals deep-sea snails in family Laubierinidae as obligate associates of crinoids (likely parasitic), including first-ever in situ observations of all 4 genera! This relationship was last seen in fossils >200 mil years old!
FREE READ: onlinelibrary.wiley.com/share/author...
FREE READ: onlinelibrary.wiley.com/share/author...
March 8, 2025 at 1:48 AM
[New Paper] in Ecology reveals deep-sea snails in family Laubierinidae as obligate associates of crinoids (likely parasitic), including first-ever in situ observations of all 4 genera! This relationship was last seen in fossils >200 mil years old!
FREE READ: onlinelibrary.wiley.com/share/author...
FREE READ: onlinelibrary.wiley.com/share/author...
[New Paper] in @commsbio.bsky.social analyses the scale and shell proteomes of the Scaly-foot Snail! We show that the scale largely contains co-opted proteins found in shells of other molluscs -- and the shell actually has more novel proteins than the scale!
OPEN ACCESS: doi.org/10.1038/s420...
OPEN ACCESS: doi.org/10.1038/s420...
March 3, 2025 at 3:45 AM
[New Paper] in @commsbio.bsky.social analyses the scale and shell proteomes of the Scaly-foot Snail! We show that the scale largely contains co-opted proteins found in shells of other molluscs -- and the shell actually has more novel proteins than the scale!
OPEN ACCESS: doi.org/10.1038/s420...
OPEN ACCESS: doi.org/10.1038/s420...
“Throughout the long evolutionary history of molluscs and continuing today, aspects of a flexible genome led to a flexible phenome: endless forms of molluscs showcase the power of animal evolution.”
Read the whole paper here (FREE!): doi.org/10.1126/scie...
Read the whole paper here (FREE!): doi.org/10.1126/scie...
February 27, 2025 at 11:34 PM
“Throughout the long evolutionary history of molluscs and continuing today, aspects of a flexible genome led to a flexible phenome: endless forms of molluscs showcase the power of animal evolution.”
Read the whole paper here (FREE!): doi.org/10.1126/scie...
Read the whole paper here (FREE!): doi.org/10.1126/scie...
Evolutionary history of molluscs was contentious for decades due to conflicting genetic data vs morphology and fossils. Our tree resolves previous controversies; also provide key insights on what the ancestral mollusc looked like!
@oceanspecies.bsky.social @sgn.one @sigwartae.bsky.social
@oceanspecies.bsky.social @sgn.one @sigwartae.bsky.social
February 27, 2025 at 11:32 PM
Evolutionary history of molluscs was contentious for decades due to conflicting genetic data vs morphology and fossils. Our tree resolves previous controversies; also provide key insights on what the ancestral mollusc looked like!
@oceanspecies.bsky.social @sgn.one @sigwartae.bsky.social
@oceanspecies.bsky.social @sgn.one @sigwartae.bsky.social
[New Paper] is on the COVER of @science.org !!
FIRST genome-phylogeny of MOLLUSCS (snails, clams, octopus, etc.) complete with ALL classes —incl. the mythical "living fossil" Monoplacophora— reveals how they evolved the most diverse body forms of all animals!
OPEN ACCESS: doi.org/10.1126/scie...
FIRST genome-phylogeny of MOLLUSCS (snails, clams, octopus, etc.) complete with ALL classes —incl. the mythical "living fossil" Monoplacophora— reveals how they evolved the most diverse body forms of all animals!
OPEN ACCESS: doi.org/10.1126/scie...
February 27, 2025 at 11:32 PM
[New Paper] is on the COVER of @science.org !!
FIRST genome-phylogeny of MOLLUSCS (snails, clams, octopus, etc.) complete with ALL classes —incl. the mythical "living fossil" Monoplacophora— reveals how they evolved the most diverse body forms of all animals!
OPEN ACCESS: doi.org/10.1126/scie...
FIRST genome-phylogeny of MOLLUSCS (snails, clams, octopus, etc.) complete with ALL classes —incl. the mythical "living fossil" Monoplacophora— reveals how they evolved the most diverse body forms of all animals!
OPEN ACCESS: doi.org/10.1126/scie...
[New Paper] led by @sigwartae.bsky.social in Progress in Oceanography reveals distribution patterns of #deepsea #molluscs from Bering Sea and Aleutian Trench -- using 212 species (>4200 specimens) collected between 3500~7300 m deep!
OPEN ACCESS: doi.org/10.1016/j.po...
@oceanspecies.bsky.social
OPEN ACCESS: doi.org/10.1016/j.po...
@oceanspecies.bsky.social
February 25, 2025 at 8:22 AM
[New Paper] led by @sigwartae.bsky.social in Progress in Oceanography reveals distribution patterns of #deepsea #molluscs from Bering Sea and Aleutian Trench -- using 212 species (>4200 specimens) collected between 3500~7300 m deep!
OPEN ACCESS: doi.org/10.1016/j.po...
@oceanspecies.bsky.social
OPEN ACCESS: doi.org/10.1016/j.po...
@oceanspecies.bsky.social
[New Paper] Meet Delectopecten thermus, a new species of Glass Scallop from a deep-sea hot vent in Okinawa Trough, Japan! We also present its mitogenome, the first for this early-diverging pectinid genus; providing key insights to gene order evolution in this family.
LINK: doi.org/10.1071/IS24...
LINK: doi.org/10.1071/IS24...
February 10, 2025 at 3:20 AM
[New Paper] Meet Delectopecten thermus, a new species of Glass Scallop from a deep-sea hot vent in Okinawa Trough, Japan! We also present its mitogenome, the first for this early-diverging pectinid genus; providing key insights to gene order evolution in this family.
LINK: doi.org/10.1071/IS24...
LINK: doi.org/10.1071/IS24...
[New Paper] @royalsocietypublishing.org Proceedings B reveals dominant circatidal biological rhythms (~12.4 hr) in the deep-sea hot vent shrimp Rimicaris leurokolos, through a 72 hr free-running experiment + transcriptomic analyses!
LINK: royalsocietypublishing.org/doi/10.1098/...
LINK: royalsocietypublishing.org/doi/10.1098/...
February 5, 2025 at 2:11 AM
[New Paper] @royalsocietypublishing.org Proceedings B reveals dominant circatidal biological rhythms (~12.4 hr) in the deep-sea hot vent shrimp Rimicaris leurokolos, through a 72 hr free-running experiment + transcriptomic analyses!
LINK: royalsocietypublishing.org/doi/10.1098/...
LINK: royalsocietypublishing.org/doi/10.1098/...