#Proboscidactyla flavicirrata

[noncompliantcyborg]

Telling apart two tiny Salish Sea jellies

Both these jellies are ~1 cm wide and have a very similar shape and coloration, especially with the ring of golden dots at the base of the tentacles and the cross shape formed by how their gut attaches inside the bell. This makes them easy to mix up in the water, but if you get closer you can tell them apart by their radial canals - those transparent structures coming off the yellow cross and down to the tentacles.

Trichydra pudica (left) - has four straight radial canals that go from each point of the gut down to the bottom of the bell. These four radial canals have curved but unbranched branches coming off both sides of the main radial canals.

Proboscidactyla flavicirrata (right) - radial canals start at each of the four points of the gut but branch immediately and repeatedly until there is a branch that ends at each of the tentacles. This branching looks like phylogenetic trees.

[aticketplz]

エイレネクラゲの仲間　Eirene sp.

エダクダクラゲ　Proboscidactyla flavicirrata

ベニクラゲの仲間　Turritopsis spp.

ヒトモシクラゲ　Aequorea macrodactyla

クラゲ展示が充実していてこのへんでは見慣れない種類がたくさん見られてよかった

@もぐらんぴあ

The jellyfish exhibit was also extensive, and I was glad to see so many rare types of jellyfish that are not often seen in my area.

@Moguranpia

[gallery-f]

プランクトン観察日記 2024/4/22-4/25

クラゲの正体を調べるべく、ネットで情報を集めようとしたが99%以上海水のクラゲばかりの紹介であって、ぼくの調べ方では淡水にいるのはマミズクラゲ1種類しか見つからなかった。しかしマミズクラゲは最大20cmにもなるそうで、これは1mm より小さいものだから、幼生であってもサイズ的におかしい気がして。それに大人のマミズクラゲとこれではたとえ成長段階が違っていても似ていないのである。

そこで、丸善へ行った折、生物学の棚でくらげ図鑑をいくつか立ち読みしてみたところ、淡水のくらげはマミズクラゲ以外にも10種類ぐらいいるようなのである。その中でも

エダクダクラゲ（Proboscidactyla flavicirrata）

というのに形がそこはかとなく似ている感じがした。しかもこれは大人になっても大きさが3mmから10mmということで、とても小さい。問題は生息域が北海道から東北らしくて、それが相違点だ。

エダクダクラゲは多毛類のエラコに寄生するらしく、多毛類といえば水槽内にアエオロソーマがいる。似たような習性ならばアエオロソーマに寄生していた可能性もある。

[namakos]

Proboscidactyla flavicirrata / エダクダクラゲ

Proboscidactyla flavicirrata

Proboscidactyla flavicirrata A diameter is less than 1 centimeter.

エダクダクラゲ 傘の直径は1cm弱。

Animalia Cnidaria Hydrozoa Anthoathecata Proboscidactylidae 動物界 刺胞動物門 ヒドロ虫綱 花クラゲ目 エダクダクラゲ科 The photo taken at Umikirara Aquarium, Nagasaki, Japan.

[noncompliantcyborg]

Some moments from nightlighting this year in the Salish Sea.

In order of appearance, this video features:

0:00 - Dendronotus iris, the giant nudibranch - first shown up close to show off its highly branched cerata, and then seen swimming. 0:22 - A harbor seal, Phoca vitulina richardii, swimming around the light while it hunts fish. 0:39 - Shrimp and fish circling the light. 1:08 - A squid jets by 1:12 - thousands of long thin larval fish school around the light 1:20 - A large cross jellyfish, Mitrocoma cellularia, pulses its bell to swim, fanning out its many fine tentacles 1:30 - many small fish swarm the pale blue light, blotting out portions of it 1:52 - a long yellow polychaete worm dances and weaves through the water column 2:04 - the crystal jellyfish, Aequorea victoria, swims with an incredible amount of Pleurobrachia bachei ctenophores and other animals in the background and then we zoom past to see more ctenophores. 2:18 - an egg yolk jelly, Phacellophora camtschatica swims by in deep blue water 2:30 - a nudibranch with long narrow cerata, Cumanotus sp., swims by swinging its body back and forth, whipping its cerata around. 2:43 - a sea gooseberry, Pleurobrachia bachei, spins through its fanned out tentacles in a gorgeous dance 2:57 - a small hydrozoan jelly with a yellow mouth and dots around its bell, Proboscidactyla flavicirrata, bounces, pulses, and then turns to the side showing off its branched radial canals 3:11 - a sea gooseberry, Pleurobrachia bachei, spins and casts rainbows with its ctenes, mouth up to the camera 3:21 - an odd gregarious jelly, Clytia gregaria, with an extra radial canal giving it a star shaped mouth, swims in the dark 3:27 - outro card "Thanks for Watching" with instagram, facebook, and bluesky icons and the handle ‪@NonCompliantCyborg‬