#polychaete worms

[iguanodont]

Mentioned briefly in my last post, but I do in fact have holographic worm stickers for sale now.

There’s far more to the world of Annelida than the humble nightcrawlers you find in your yard; many species are found in marine environments, where they take such varied forms as the fearsome bobbit worm or the ethereal tomopteris. Here I’ve rendered a ragworm (family Nerididae); a sort of polychaete (bristle worm) found in benthic marine (and occasionally freshwater) environments the world over.

Some cool facts to win you over:

1. The largest ragworm in the world is the king ragworm (Alitta virens), which ready achieves lengths of 4 ft/120 cm.

2. Ragworms are an important part of the live sea-bait industry. Unfortunately that also means they have been harvested so extensively in some areas that their populations are threatened.

3. Ragworms reproduce through a bizarre process called epitoky, in which the benthic worm either transforms into a free-swimming reproductive morph, or buds off several free swimming sex-clones to party in the world above. Either way, it will be the final act of the animal’s life.

4. Ragworms, like bobbit worms, have large, eversible mandibles in their pharynx that they extrude to give a nasty bite.

5. On the topic of ragworm jaws, the material they are made of is very strong and lightweight, despite lacking the calcium mineralization of most other animals with hard body structures. There is some research investigating its structure for aerospace engineering applications!

[vestaignis]

Сабеллиды – семейство сидячих многощетинковых червей, распространенных в донных сообществах всех океанов. К сидячему образу жизни сабеллиды приходят не сразу. На стадии личинки червь безмятежно дрейфует в океанических водах. Взрослые особи живут в песке или в илистом грунте мелководной зоны. Сабеллиды - социальные животные, образующие большие колонии в тех местах, где достаточно пищи. На переднем конце тела сабеллид расположена пара перистых, покрытых ресничным эпителием пальп. С помощью этих перьеобразных щупальцев-жабр черви собирают из толщи воды и с поверхности грунта частицы, которые затем используют в пищу или для построения трубки. Кусочки грунта они смешивают со слизью и строят трубки из материала, напоминающего пергамент. Длина трубок в зависимости от вида колеблется от 2 до 10 см. Пальпы одновременно служат и органами дыхания, так как через их поверхность осуществляется интенсивный газообмен. Кроны этих щупальцев выступают из торчащих на дне трубок подобно лепесткам великолепных цветов. Однако при малейшем движении воды «цветы» мгновенно втягиваются, оставляя на поверхности лишь низкие серые «пеньки». Окраска щупальцев-жабр червей разнообразная, но чаще всего это бежевые, желтые, коричневые, черные, темно-красные, лиловые и белые цвета. Зоологи обнаружили более 10 тысяч видов этих животных.

Sabellidae are a family of sessile polychaete worms common in benthic communities of all oceans. Sabellids do not immediately adopt a sedentary lifestyle. At the larval stage, the worm drifts serenely in ocean waters. Adults live in sand or muddy soil in the shallow water zone. Sabellids are social animals, forming large colonies in places where there is enough food. At the anterior end of the sabellid body there is a pair of feathery palps covered with ciliated epithelium. With the help of these feather-like tentacles-gills, the worms collect particles from the water column and from the surface of the soil, which are then used for food or to build a tube.They mix pieces of soil with mucus and build tubes from a material resembling parchment. The length of the tubes, depending on the type, ranges from 2 to 10 cm. The palps also serve as respiratory organs, since intensive gas exchange occurs through their surface. The crowns of these tentacles protrude from tubes protruding from the bottom like the petals of magnificent flowers. However, at the slightest movement of water, the “flowers” ​​are instantly retracted, leaving only low gray “stumps” on the surface. The color of the tentacles-gills of worms is varied, but most often they are beige, yellow, brown, black, dark red, purple and white. Zoologists have discovered more than 10 thousand species of these animals.

Источник:https://m.vk.com/video-177833227_456240992?list=f6ce210ae901f2fd35&from=wall-3724862_1674, /ru.wikipedia.org/wiki/Сабеллиды, /vk.com/volgbioclub //www.gismeteo.ru/news/animals/raspushit-perya-kto-takie-sabellidy-i-zachem-im-nuzhny-pjoryshki/, /muzei-kholmsk.shl.muzkult.ru/Sabellids, //pofoto.club/32013-sabellidy.html, /zoogalaktika.ru/photos/invertebrata/annelida/polychaeta.

[rattyexplores]

14/09/23 - Syllidae sp.

14/09/23 - Annelida sp.

14/09/23 - Unidentified

14/09/23 - Annelida sp.

14/09/23 - Unidentified

14/09/23 - Annelida sp.

Marine worms collected from tidepools

14/09/23

QLD:CQC - Yeppoon, tidepools

[uncharismatic-fauna]

Stop a Moment for the Sand Striker

Also known as the bobbit worm, Eunice aphroditois is a marine bristle worm endemic to both the Atlantic and Pacific oceans, in waters up to 95 m (311 ft) deep. Because they spend most of their time under ground, the sand striker is rarely seen. However, they can be found in both coral reefs and deeper, rocky or sandy ocean floors-- anywhere they can hide and ambush prey.

This species of bristle worm is famous for its hunting methods. Individuals live in burrows deep under ground, with an entrance covered by sand or rocks, and only emerge at night. They keep these burrows stable by secreting a mucus-like substance which coats the sandy walls and keeps them in place. Because their eyes are rudimentary at best, sand strikers use their five antennae to sense passing prey-- usually fish, but also algae or organic debris. When their target is close enough, E. aphroditois ambushes it and drags it back down into the burrow with its large mandibles. This process is extraordinarily fast; bobbit worms have been clocked moving at 6 m (20 ft) per second. The mandibles are also retractible, which helps the bobbit worm swallow its prey.

Though only their heads are usually visible, the sand striker has an impressive body. They can grow to be 1- 3 m (3-10 ft) long, although they’re typically only 25 mm (1 in) wide. Like other bristle worms, their bodies are made up of segments, protected by a hard, irridescent exoskeleton. Most sand strikers are deep purple or black, although individuals in a variety of colors have been documented. In addition to their exoskeleton, bobbit worms also sport sharp, venomous tentacles down the length of their body to deter threats. Adults are typically avoided by other, larger predators, but juveniles can be targeted by fish.

E. aphroditois lacks external reproductive organs, and instead is a broadcast spawner. When they’re ready to mate, female sand strikers produce a pheromone that attracts males and signals them to release their sperm. The females them release their eggs into the water, where they become fertilized and develop into larvae. These larvae swim freely for several months to a year, during which many become food for other animals. The survivors begin to segment and burrow into the sand, where they become sexually mature. In the wild, bobbit worms can live anywhere from 3-5 years, though some biologists believe they may have a longer lifespan of 10-15 years.

Conservation status: E. aphroditois has not been evaluated by the IUCN. However, populations in coral reefs are threatened by habitat decline.

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Photos

Richard Zerpe

Department of Biomedicine, University of Basel

Chutinun Mora

[xidyl]

Feather Duster Worm sketch

[odetoscavengers]

YEAR OF THE DRAGON

[bethanythebogwitch]

Wet Beast Wednesday: bone-eating worm

Happy (almost) Halloween from us at Wet Beast Wednesday. What better to celebrate the spooky holiday than with a spooky animal? These critters are so spooky they even scare skeletons. Sometimes called zombie worms or bone worms, bone-eating worms are scavengers that play an important role in deep seas. Try not to get too scared.

(Image: a cluster of bone-eating worms on a bone. Their plumes are visible, looking like red feathery structures emerging from a clump of brown sludge. End ID)

Bone-eating worms are members of the genus Osedax, with 26 species currently known. My favorite is Osedax mucofloris, which means "bone-eating snot flower". They are small tube worms, reaching between 2.5 and 7 cm (1 to 2.7 in) in length. The body is divided into three segments, the trunk, ovisac, and root. The trunk makes up the majority of the body and it topped by red plumes that act as gills. At the base of the trunk is the ovisac, where eggs are produced. Below that are the roots that bore through the bones the worms live on. This is done by secreting carbonic acid that is produced through anaerobic respiration. The roots also produce a mucus sheath whose purpose is not fully known. It may protect the body from the acid or may prevent the acid from dissolving the hole the worm lives in. As with other tubeworms, the worm generated a protective sheathe to live in. Normally, the plumes extend out of the sheathe to respirate, but when threatened, they will withdraw into the tube.

(Image: a bone worm removed from the bone. It is a long, translucent tube with reddish plumes on one and a lump of wavy roots on the other. End ID)

Bone-eating worms lack a mouth, anus, and digestive system. To obtain nutrients, they exist in a symbiotic relationship with bacteria. As the worms break down the bone, they release lipids and proteins that the bacteria consume to produce energy in the form of glycogen, which is transferred to the worm. The worm then uses the glycogen to power itself and feeds it to the bacteria to keep them alive. The worms also use collagen, which is the primary component of bone. Many of the symbiotic bacteria species need the collagen, which the worm provides by breaking down the bone. Curiously, many of the symbionts produce toxins that disrupt the membranes at the roots, leading to infection. The bacteria are also found surviving outside of symbiosis with the worms Because of this, it is debatable whether the relationship between the worm and its bacteria is mutualistic (both parties benefit) or commensal (one party benefits, the other neither benefits nor suffers).

(Image: a cleared view of bone worm plumes emerging from a bone. End ID)

Bone-eating worms are found worldwide in oceanic depths ranging from 10 to 4,200 meters (30 to 14,000 ft). They are most commonly found on the skeletons of whales, but will also colonize fish bones and even, in one experiment, cow bones. Whale bones seem to be preferred both because of their large size and the large quantity of lipids found within. Whale skeletons can often be seen covered with bone worms, giving them the appearance of red shag carpeting. As the worms break down bones, other animals can take better advantage of the nutrients within. The presence of bone worms at a whale fall has been shown to increase the biodiversity of the site. Bone-eating worms are ecosystem engineers, organisms that significantly alter their habitat. They have been doing this since before whales existed. Fossil sea turtle and plesiosaur bones have been found with signs of bone worm colonization.

(Image: a lone bone worm with its tube visible. Its plumes are whitish. End ID)

The bone-eating worms have one of the most dramatic cases of sexual dimorphism in the animal kingdom. All the worms you see when you look at a whale skeleton are females. The males are 20,000 times smaller and fully microscopic. They still resemble larvae, making them a case of neoteny, an adaptation where juvenile characteristics are retained into adulthood. Harems of males live inside the females' tubes and feed on the nutrients released by the bacteria. As the female generates eggs, the males fertilize them. The eggs hatch inside the female's tube and stay for a while to mature before being released into the water. The fact that the worms are so widely distributed indicated that the larvae can travel vast distances to find a new set of bones, but the means they use to do so is unclear. The extreme sexual dimorphism reduces competition between males and females and ensures the males will always have an available mate to pass on their genes. The species Osedax pirapus do not follow this form of dimorphism. Males are still smaller than females, but they actually look like worms and share the same lifestyle. This increases competition between males and females, but ensures that males can make far more sperm due to their greater size.

(Image: a collection of images of multiple species of bone-eating worms. Source. End ID)

[toadalled]

I edited my leech sketch to make a ragworm for a customer

[critter-creature-or-beast]

By Jenny - Flickr: "Aliens" movie star!, CC BY 2.0

[tgithursday]

My bobbit worm Fakemon :)

Babbit is based off of the larvae and Annihilid is the adult worm!

[have-you-seen-this-animal]

Photos thanks to Oceana & Scuba!

[onenicebugperday]

there's this strange sort of beast that's inspired arguments on pinterest, and I was wondering if you or your other followers could identify it. personally I am of the opinion that it is some variety of Leggéd Worm

It's marine, not a bug. I'm no sort of expert on marine life but it looks like a polychaete worm to me. No idea what species since there are thousands. The "legs" aren't used for walking but rather for swimming.

[prettycreepyprettycrawly]

A painter preoccupied with bobbit worms.

[considernature]

Maann nobody gives a shit about bristle worms but LOOK at these fellas

What good dudes! That last guy can turn into a bear trap like this:

Bam! Now he's a bear trap!

[alphynix]

Soft-bodied annelid worms only very rarely fossilize, so the group's origins during the Cambrian Period are still rather poorly understood. So far about thirteen different species have been found in sites of exceptional preservation, showing that even very early on in their evolution these worms had already diversified into a wide range of ecologies including bottom-feeders, carnivores, swimmers, tube-builders, and even symbiotes sharing living space with early acorn worms.

Ursactis comosa here adds a fourteenth species to the list. Found in a newly-discovered outcrop of the 508-million-year-old Burgess Shale fossil deposits in western Canada, it's known from nearly 600 specimens clustered together in several large groups, making it the current best-known and most numerous of all Cambrian annelids.

Up to about 1.5cm long (~0.6"), it was a polychaete-like worm bearing bundles of long bristles. There was a pair of large sensory palps on its head, and its body was made up of an unusually small number of segments – just 10, with larger individuals just increasing the size of their segments instead of adding on additional ones like most modern annelids.

Unlike other Cambrian annelids it also shows some evidence of basic tagmatization, differentiating some of the rear segments of its body with much longer bristles.

The large numbers of Ursactis found preserved in one place suggests these worms were exhibiting some sort of swarming behavior. Since ages from juveniles to fully-grown adults are represented together, and their anatomy indicates they were crawling detritivores, they were probably all taking advantage of a particularly nutrient-rich patch of seafloor at the time they were abruptly buried in a mudslide.

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[grox-empire]

HAPPY LATE BIRTHDAY TO THE WORMLORD, @krillrot!

Version without VHS filter below cut: