Corine PicardMay 9, 2025
Un superbe Nephtys assimilis, trouvé lors d'une sortie estran à Le Croisic.
#biologie #marine #ver #annelid #polychete #polychaete #estran
Bob Nicholls ArtApr 29, 2025

My 25 years of palaeoart chronology...

Here's a study of Kingnites, commissioned in 2022 for a project I cannot talk about yet. Kingnites, is an exceptionally large (1m long) Silurian polychaete annelid.

#Art #Painting #PaleoArt #PalaeoArt #SciArt #SciComm #DigitalArt #Illustration #Dinosaurs #Palaeontology #Paleontology #Kingnites #Silurian #Polychaete #Annelid #Worm #Fossil

Gaspar JekelyApr 17, 2024
Beautiful new study by Michael Bok, Macali & Garm on the high-resolution eyes of the enigmatic alciopid annelids, from Ponza island.
"Our results show that the eyes of alciopids possess the anatomical, morphological, and physiological properties requisite for high resolution tasks and object vision"
https://doi.org/10.1016/j.cub.2024.02.055
#annelid #Evolution #eye @biology @mikebok
PLOS BiologyApr 11, 2024
.@SoerenHaefker @FRKT_labs &co reveal high individual diversity in #circadian behavioral patterns in the marine #annelid #Platynereis, showing that behavioral rhythmicity is not correlated with oscillations in core clock genes. @maxperutzlabs #PLOSBiology https://plos.io/49wKz9q
Molecular circadian rhythms are robust in marine annelids lacking rhythmic behavior

Behavioral rhythmicity is often used as a readout for organismal rhythmicity. This study reports high individual diversity in circadian behavioral patterns in a marine annelid worm, showing that behavioral rhythmicity is not correlated with the relative fraction of cycling transcripts or with oscillations in core clock genes.

Gaspar JekelyMar 8, 2024
A beautiful new species of deep-sea nereid #annelid with gills on its parapodia.
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0297961
A remarkable new deep-sea nereidid (Annelida: Nereididae) with gills

Nereidid polychaetes are well known from shallow marine habitats, but their diversity in the deep sea is poorly known. Here we describe an unusual new nereidid species found at methane seeps off the Pacific coast of Costa Rica. Specimens of Pectinereis strickrotti gen. nov., sp. nov. had been observed dating back to 2009 swimming just above the seafloor at ~1,000 m depth but were not successfully captured until 2018. Male epitokes were collected as well as a fragment of an infaunal female found in a pushcore sample. The specimens were all confirmed as the same species based on mitochondrial COI. Phylogenetic analyses, including one based on available whole mitochondrial genomes for nereidids, revealed no close relative, allowing for the placement of the new species in its own genus within the subfamily Nereidinae. This was supported by the unusual non-reproductive and epitokous morphology, including parapodial cirrostyles as pectinate gills, hooked aciculae, elfin-shoe-shaped ventral cirrophores, and elongate, fusiform dorsal ligules emerging sub-medially to enlarged cirrophores. Additionally, the gill-bearing subfamily Dendronereidinae, generally regarded as a junior synonym of Gymnonereidinae, is reviewed and it is here reinstated and as a monogeneric taxon.

Lukas VFN 🇪🇺Sep 24, 2023

Insights into the #biodiversity of #annelids in the world's largest #DeepSea mineral exploration region https://phys.org/news/2023-09-insights-biodiversity-annelids-world-largest.html

#Checklist of newly-vouchered #annelid taxa from the #ClarionClippertonZone, central #Pacific Ocean, based on morphology and genetic delimitation: Helena Wiklund et al. https://bdj.pensoft.net/article/86921/

"Annelids represent one of the largest group of macroinvertebrates living within the mud covering the sea floor of #CCZ, both in terms of number of individuals and species."

Insights into the biodiversity of annelids in the world's largest deep-sea mineral exploration region

The demand for rare raw materials, such as cobalt, is fueling the exploration of the deep-sea floor for mining. Commercial deep-sea mining is currently prohibited in areas beyond national jurisdiction, but companies are permitted exploratory operations in certain areas to assess their mineral wealth and measure environmental baselines.

Phys.org
Matt WillemsenAug 15, 2023
Cambrian Annelid Worm Had Bizarre Blade-Like Chaetae
Chaetae are stiff bristles made of chitin that characterize many species of annelid worms.
https://www.sci.news/paleontology/shaihuludia-shurikeni-12163.html #cambrian #worm #chaetae #annelid
Show threadGaspar JekelyMar 2, 2023
Hydrostatic pressure is a dominant cue in the sea and many aquatic organisms are known to respond to changes in pressure, however the neuronal mechanisms have remained unclear.
We studied the larvae of the marine #annelid #Platynereis and found that they respond to increases in pressure by increased upward swimming.
#neuroscience
2/9
KaylinQFeb 2, 2023

"Researchers at Durham University, UK, and Northwest University, Xi'an, China, examined 15 exceptionally preserved fossils of the #annelid #worm #Iotuba #chengjiangensis dating from the early #Cambrian period 515 million years ago.

The fossilized remains included evidence of the worms' guts and kidneys and revealed they had an unexpectedly complex structure similar to that of other #annelid #worms."

https://phys.org/news/2023-01-ancient-fossils-evolution-sea-worm.html

Ancient fossils shed new light on evolution of sea worm

Ancient fossils have shed new light on a type of sea worm linking it to the time of an evolutionary explosion that gave rise to modern animal life.

Phys.org
Lukas VFN 🇪🇺Feb 1, 2023

Ancient #fossils shed new light on #evolution of sea worm https://phys.org/news/2023-01-ancient-fossils-evolution-sea-worm.html

The #Cambrian cirratuliform Iotuba denotes an early #annelid radiation https://royalsocietypublishing.org/doi/10.1098/rspb.2022.2014

#Annelids—or segmented #worms—diversified into different lineages some 200 million years earlier than previously thought and were part of the evolutionary leap known as the #CambrianExplosion.

Ancient fossils shed new light on evolution of sea worm

Ancient fossils have shed new light on a type of sea worm linking it to the time of an evolutionary explosion that gave rise to modern animal life.

Phys.org