#paguridae

[alphynix]

Strange Symmetries #13: The Hermit Crab Cycle

Hermit crabs are crustaceans that first appeared at the start of the Jurassic, about 201 million years ago. Despite their common name they aren't actually true crabs, instead being a classic example of convergently evolving a crab-like body plan via carcinization.

They also have noticeably asymmetric bodies, with abdomens that coil to one side and differently-sized front claws.

Pagurus bernhardus by Arnstein Rønning | CC BY 3.0

And while modern hermit crabs are famous for inhabiting scavenged snail shells, their fossil record suggests this wasn't always the case.

Originally, they seem to have lived in ammonite shells.

Palaeopagurus vandenengeli lived in what is now northern England during the Early Cretaceous, about 130 million years ago. Around 4-5cm long (~1.6-2"), it was found preserved inside the shell of the ammonite species Simbirskites gottschei.

Its left claw was much larger than its right, and together they would have been used to block the shell opening when it was hiding away inside. And while the exact shape of its abdomen isn't known, it probably asymmetrically coiled to the side to accomodate the spiralling shape of the host shell.

Hermit crabs seem to have switched over to using gastropod shells by the Late Cretaceous, around 90-80 million years ago, possibly due to marine snails developing much stronger sturdier shells during this period in response to the increasing prevalence of specialized shell-crushing predators. The more upright snail shells would also have been much easier to drag around the seafloor than ammonite shells – and meant that they were ultimately less affected by the total disappearance of ammonites during end-Cretaceous mass extinction.

———

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[k-star-holic]

Evil community Lee Soo-hyun "Shopping for me, buying 5,000 won accessories"

Source: k-star-holic.blogspot.com

[flying-potato2]

guy named pvc pipe

[drhoz]

#1964 - Diacanthurus rubricatus

photo by @purrdence​ 

A large Pagurid hermit crab, endemic to most of the coastlines of New Zealand. I don’t have much other information on them, unfortunately. Often found with anemones living on the shell, and a small copepod Kioloaria tapui that lives in the tip of the shell, discovered in 1982.  ‘tapui’, means ‘close friend'.

[murruspins]

Am doing okay, it's good that you are too! I'd love to hear about any of the two, I find hermit crabs cute :>

- @batsbolts-andfangs

I’m glad you’re doing good!!

As you may know, hermit crabs are, well, crabs ofcourse! They belong to the family Paguridae and Coenobitidae! These crabs use empty snail shells (e.g., whelk or periwinkle) or other hollow objects as their home! However, painted shells are no good. Painted shells can poison them, and they will end up dying from them :(. So if you see a hermit crab with a painted shell, give them a regular shell if you can find one nearby! They’ll slowly switch shells. Might just save their life :3!!

Many people own hermit crabs, there are many species so I can’t go into direct care like heating and humidity as they’re all different depending on the subspecies. However, hermit crabs need both water and land to survive! Hermit crabs, can infact drown. To properly house hermit crabs, you should have a enclosure which is mainly land, with two large pools of water, one salt one fresh, as they require both to survive. They also require calcium in their enclosure! One way to provide this is by giving them cuttlefish bones and they’ll chip away at it overtime. Hermit crabs can not survive on pellets or food targeted as "hermit crab food". They require a fresh mix of fruit, veg, meat/protein, and more. They’re not easy to feed! You have to do a lot of research into their diet. One of the most common reasons for hermit crab death in captivity is diet.

Please note that hermit crabs CANNOT be bred in captivity, as of today. Maybe in the future it’ll become possible, but so far we have had no success breeding these crabs. We don’t know why, but it’s just not happening. So any hermit crab you buy, will be wild caught. Ontop of that, Hermit crabs experience immense stress when suddenly in a new environment. To deal with this, you have to slowly build up their habitat around them, or you’ll have a stressed hermit who will die. Overall, hermitcrabs are decently hard to keep, but if you’re commited, they’ll make wonderful pets. Just be careful who you buy one from, what you put in the enclosure, and what you feed them. Do your proper research, as usual!

Now onto fun facts!

• These crustaceans have been misnamed for two reasons: First, they’re not true crabs, like blue crabs, in that they don’t have a uniformly hard exoskeleton and can’t grow their own shells. Instead, hermit crabs have a hard exoskeleton on the front part of their bodies but a soft tail on the other half, which they protect using the discarded shells of other animals, like whelks. They’re more closely related to certain kinds of lobsters than to true crabs!

• Hermit crabs have a curled tail with a hook that enables their bodies to fit inside these borrowed shells.

• Sometimes when a new shell turns up, hermit crabs will form a line, biggest to smallest, to see which animal fits the new shell

• Hermit crabs are social creatures, and must be kept in duos or more! You’ll also find them like this in the wild!

• There are over 800 species of hermit crabs worldwide!

Thank you for coming to murruyu’s rant!

[snnjsktch]

Hermit crabs (Paguridae) and Anemone simbiosis / Hermit crabs using trash as shells

[todropscience]

A tiny and cute hermit crab (Pagurus cf. villosus), living in a dog whelks shell (Nassarius gayi).

[only-fragments]

#2550

Paguridae what a pink-fleshed thing I amall soft meat and squinting eyesflinching at every sudden sound out in the world I am horribly exposedclothes offer no comfort from others’ perceptionbuildings no shelter from the world’s ugliness only in my home biome am I safearmored by evergreens and blackberriessecure in my shelter of seawater and songbirds yet as glaciers melt and wildfires rageand…

[jannis-world-connection]

#Repost from @pezdepie with @ming.app . A ratos, convencido, digo que todos los días subiré una imagen nueva pero la procrastinación es el elemento incólume de estos días. La cuarentena silenciosa y la propaganda del mundo. Hoy, en esta fotografía les traigo un individuo de la familia Paguridae. La familia Paguridae es una familia de anomuros mayormente representado por los cangrejos ermitaño, la foto corresponde al ermitaño más común de nuestras cosas, Pagurus edwarsi, este animalito habita mayormente la zona intermareal encontrándose también en lugares de mayor profundidad. Encontrándose desde el Callao Perú hasta el sur de las costas chilenas. Este animal recibe su nombre de ermitaño debido a que habita caparazones vacíos de distintos caracoles (gasteropodos) como por ej, Tegula atra, T. tridentata, encontrándose también en O. peruviana entre otros. A medida que este animalito va creciendo va buscando nuevas conchas donde refugiarse, ya que sin la protección de algun caparazón externo es presa fácil debido a la falta de calcio en su propio caparazón. Su rostro es corto, abdomen suave y enrollado (ayudándolo a encajar muy bien dentro de alguna conchita) cuanso este animal busca un nuevo hogar puede tener la suerte de encontrar alguna vivienda vacía o emprender una verdadera guerra para hacerse de un nuevo hogar que le brinde seguridad. Haz como el cangrejo ermitaño 🦀 y quédate en el refugio de tu casa, ordena tu conchita y haz tiempo hasta que pase este temblor. A 29 años de la reivindicación los ermitaños del mundo celebran. #ecología #biología #educacioninfantil #educacionambiental @buceoiquique #cuidemosnuestropatrimonio #educacion #patrimonionaturalsubmarino #playablanca #areasmarinasproteguidas @aula_azul #underwaterphoto #freediving #underwaterworld #ilovedive #Iquique #uwlife #uwphotography #scuba #scubadiving @chileesmar https://www.instagram.com/p/B-c7zZ7hZSI/?igshid=6uhjcsywxpj3

[weblack6668]

[足球] 三場

新發財情報已發佈到 http://black66.com/1911/

[足球] 三場

[足球] 三場

作者yeisyuan (葉葉)

看板SportLottery

標題[足球] 三場

時間Tue May 28 00:10:00 2019

30/87

倒到懷疑人生

550 諾爾雪平 @ 哈馬比 大2.5

（1:2）

551 天狼星 @ 歐瑞布羅 大2.5

（2:1）

感覺有機會倒打，雙方過去也很會繼續大

504 斯圖加特 @ 柏林聯 大2.5

（1:2）

柏林聯上去啦，史特加真的廢 主場喜迎升甲 可喜可賀 可喜可樂(′・ω・)σ

睡覺單三個大，全過前五樓不重複100P

惡夢美夢起床就知

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推 nimlbank : (′・ω・)σ 05/28 00:14

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→ gintoki1231 : Ye 05/28 00:15

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推 shenasu : 瑞典兩場都下盤領先中 不過我只看雙打和 05/28 01:40

推 shenasu : 奧布雷治半場沒射正 05/28 01:58

推 Paguridae : 最近哈馬比上半追破蛋很穩 9勝1敗 05/28 12:04

[gallinagomedia]

Le bernard-l'hermite (ou pagure)

Pagurus bernhardus

Common hermit-crab

Le bernard-l'hermite dispose d'une carapace mais incomplète; son ventre nu le rend vulnérable. Pour se protéger, rien de tel qu'une coquille de gastéropode dans laquelle il rentre à reculons.”

Ses 10 pattes assurent différentes fonctions  : “Les trois paires avant dont ses deux pinces lui servent à se déplacer. Son avant-dernière paire de pattes lui sert à accrocher sa coquille, sa dernière paire arrière l'attache à l'axe central de sa coquille.

Sa pince droite est plus grande que la gauche. Elle lui sert aussi à boucher l'entrée de sa coquille d'emprunt en cas de danger.”

Il est présent en Méditerranée.

 source : www.nausicaa.fr/

photo : © OCEANA Juan Cuetos 20160820_Vesterhavet 2745 par Oceana Europe

[jeremiah-dixon-the-surveyor]

寄居蟹  PAGURIDAE.

[todropscience]

Researchers have just discovered a new hermit crab species!!  Named Candy striped hermit crab (Pylopaguropsis mollymullerae), this species is described based on specimens from the shallow reefs of Bonaire, Lesser Antilles, southern Caribbean Sea. The description it was release in the january issue of zookeys.

Populations of this new species were discovered and photographed in the Bonaire National Marine Park under a large coral ledge, at a depth of 13.7 m, living in crevices close to flaming reef lobsters (Enoplometopus antillensis), and broad banded moray (Channomuraena vittata).

The highly visible color pattern of bright red stripes on white background typical of decapods known to have cleaning symbioses with fish, dense hair-like setaes on antennae, and preference for a crevicular habitat, combined with brief in situ nocturnal observations, suggests the possibility that Candy striped hermit crab engages in “cleaner” activities or functions as a “den commensal” with moray eels.

- In situ video of Pylopaguropsis mollymullerae 

Reference (Open Access): Lemaitre. 2017. Discovery of A New Species of Hermit Crab of the Genus Pylopaguropsis Alcock, 1905 from the Caribbean: “Den Commensal” or “Cleaner”? (Crustacea, Anomura, Paguridae). ZooKeys.

[weblack6668]

[發錢] 感謝澳甲賜我吃穿

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[發錢] 感謝澳甲賜我吃穿

[發錢] 感謝澳甲賜我吃穿

作者xxyyzz4901 (xyz)

看板SportLottery

標題[發錢] 感謝澳甲賜我吃穿

時間Sat Feb 2 20:46:01 2019

我的好麻吉水手今年已賜我兩次場中被逆轉的十幾倍高賠 今天新朋友貓叫也加入行列讓我尻到串關讓和 猜到我這張下注時間或最接近的板友 選兩位各500塊沾沾喜 提示 玩火箭場中下注的

View post on imgur.com

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[todropscience]

In another times, hermits crab used shell from another mollusc groups, not just gastropods, but also ammonoid shells. As shows one of the few (if it isn´t the unique)  fossil pagurid inside a cephalopod shell

Ammonoids are an extinct group of cephalopods, unique in having full exoskeletal spiraled shells, as opposed to squids and octopuses.  However, despite having an external shell like modern Nautiluses, they are evolutionarily more related to the squids and octopuses.

Modern hermit crabs always use empty shells and never kill the original occupant,  probably these paguridos did the same.

Reference (Open Access):  Fraaije, 2003. The oldest in situ hermit crab from the lower cretaceous of speeton, uk. Paleontology 

via Deep Sea News

[todropscience]

Este es un fragmento de la BBC Life Story, y captura un comportamiento animal hermoso y muy poco conocido de los cangrejos ermitaños.

Cuando una concha llega a la orilla, los paguridos, como también se les conoce a estos crustáceos; se miden entre sí y luego se alinean de mayor a menor, hasta que aparece un cangrejo con el tamaño adecuado para la concha.

Entonces, los cangrejos pasan sus viejas conchas en orden hacia atrás, tomando una nueva desde adelante. De esa manera, cada cangrejo ermitaño en la fila encuentra su nuevo hogar con poca molestia.

Más BBC Life Story

english version