#cirrata

[e-quarium]

༄.°⋆｡˚ Baby Cirrate Octopus !!

[herpsandbirds]

Flying in the deep: the description of a new species of Grimpoteuthis (Octopoda: Cirrata: Grimpoteuthidae) from the Caroline Seamount, with ecological adaptation of dumbo octopuses

Yan Tang, Xiaodong Zheng & Junlong Zhang

Abstract

The dumbo octopus is a deep-sea benthic macrofauna belonging to the Cirrata. It is considered a primitive taxon, displaying adaptive characteristics for deep-sea environments. In the course of a 2017 survey, a single specimen of Grimpoteuthis was captured at a depth of 1240.0 m on the Caroline Seamount in the Western Pacific Ocean. Through integrative taxonomy, this species was identified as new to science and named Grimpoteuthis feitiana sp. nov. In this study, the mitogenomes of the new species, together with another unidentified Grimpoteuthis sp. sampled from the Zhenbei Seamount, were fully sequenced. Phylogenetic analyses strongly supported the monophyly of the Grimpoteuthis and its close relationship with Luteuthis. Grimpoteuthidae was grouped with Opisthoteuthidae, Cirroctopodidae, and Cirroteuthidae in succession. Our analyses revealed that certain residues in the mitochondrial genes of deep-sea octopods have undergone positive selection, potentially contributing to their adaptations to energetic requirements. Our study emphasizes the importance of increasing sample size to offer further morphological and phylogenetic evidence and insights into octopus adaptations to the deep-sea environment in future studies.

Source: Organisms, Diversity, & Evolution

[cephalopodidentifier]

i didnt have any octopus photos on hand, so i went ahead and drew two myself... hopefully they're recognizable enough to be identified! happy world octopus day!

Closest IDs: Opistoteuthidae (Dumbo octopuses) and Octopodoidea (Typical octopuses and allies)

Reasoning: I’d recognize that little guy anywhere. Not sure if the right octopus is E. dofleini (because the skin texture looks quite rippled and I don’t see an ocellus) or O. cyanea (star pattern around the eye, little spot on the mantle)

Thank you for the drawings! 💙

[todropscience]

NEW SPECIES OF DUMBO OCTOPUS DISCOVERED IN THE PACIFIC OCEAN

The dumbo octopuses are a group of deep-sea cephalopods with around 45 species know to date. These octopuses have “fins” on the sides of the head, resembling elephant ears, and have relativelly small sizes.

Now, using a cominantion of minimally invasive gene analysis and non-invasive techniques digital photography, a team of german biologists has discovered a new species of dumbo octopus, named Emperor dumbo Grimpoteuthis imperator, living at more than 4000 m depth in the northern part of the Emperor Seamounts, an undersea mountain chain in the northwestern part of the North Pacific.

- Map of the North Pacific Ocean. Red dot shown location of the Emperor seamounts, from where the Emperor Dumbo was discovered. 

Usually, collecting and describing organisms from the deep ocean implies invasive methods, requiring dissection to examine internal organism, and even partial destruction of specimes. Thus, this methodology help to maintain valuable specimes for further researchs.

-Collected in July 2016, using a chain bag dredge, the specimen reached 30 cm in size, and was identified as a mature male.  Using a combination of MRI, micro-CT, researchers were able to build the first interactive 3D model of a cephalopod beak.

Researchers make available a digital copy of the animal, so anybody interested can download it from the online database "MorphoBank" for further research and learning purposes. The preserved octopus itself is kept in the archives of the Museum für Naturkunde in Berlin, Germany. 

Reference:  Ziegler and  Sagorny. 2021. Holistic description of new deep sea megafauna (Cephalopoda: Cirrata) using a minimally invasive approach. BMC Biol.

[Photo description: Main photo, a single octopuses with different views of its body, showing their arms, mouth and fins.

[todropscience]

DUMBO OCTOPUS HATCHLINGS LOOKS LIKE ADULTS

Cirrate octopods, cephalopods known as the dumbo octopuses are among the largest invertebrates of the deep sea. These organisms have long been known to lay single, large egg capsules on hard substrates on the ocean bottom, including cold-water octocorals. Although juveniles have previously been collected in the midwater, cirrate hatchlings have so far never been observed. However, researchers has been able to locate a dumbo octopus eggs in a submarine mountain at 1,900 m, and have discovered that they look and act like adults from the moment they hatch.

The egg capsule is comprised of an external egg case as well as the chorion and developing embryo. Development in cirrates proceeds for an extended time without parental care

-  Dumbo octopus hatchling, with opened egg case attached to octocoral Chrysogorgia artospira collected at 1,965 m depth on Kelvin Seamount, Atlantic Ocean. 

The baby dumbo octopus behavior shows that cirrate hatchlings possess all morphological features required for movement via fin-swimming, for visually and chemically sensing their environment, and for prey capture. The presence of a large internal yolk sac reduces the risk of failure at first feeding. This is enough evidence that dumbo octopods hatch as competent juveniles.

Cold-water octocorals appear to be critical in cirrate life cycle, and their destruction by bottom trawling or mining will impact populations of mobile animals like the charismatic dumbo octopods

Photo: Tim Shank

Reference: Shea et al., 2018.  Dumbo octopod hatchling provides insight into early cirrate life cycle. Current Biology.

[dinoboyo66]

Hey Fellas🦖

A new #Palaeontology short detailing the new prehistoric octopus #nanaimoteuthis is now available on YouTube.

Check it out here: https://youtube.com/shorts/pxGffNzwxW4?si=oos7r9poPGwr5siz

Enjoy!!!

[exxos-von-steamboldt]

Top predators drive changes in ecosystem structure. For the last ~370 million years, large-sized vertebrates have dominated the apex of the marine food chain, while invertebrates have served as smaller prey. Here we describe invertebrate top predators ...

[onehourgameplay]

Cirrata - 1080p Gameplay, Walkthrough. ▲One Hour Gameplay #Cirrata #Gameplay #Walkthrough #OneHourGameplay