Hannes
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federgeistchen.bsky.social
Hannes
@federgeistchen.bsky.social
210 followers 93 following 250 posts
Worm enthusiast 🪱 mollusc maniac 🐌 and crustacean fanatic 🦀
I just prefer my animals boneless…

23 | wildlife photographer | biology student

Non-animal-related account: @eyekosaeder.bsky.social
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federgeistchen.bsky.social
Hannes @federgeistchen.bsky.social · Nov 12
It is finally #WormWednesday again! 🪱
The perfect time to post my photo of this 40 cm long beast! :D

Scientific name: Phyllodoce lineata

↓ thread with more info ↓

#marinelife #polychaetes #invertebrates
Phyllodoce lineata against a black background. The head (top middle-left) has a bright yellow main colour, turning more muddy towards the tip. There are 4 short antennae located at the front as well as 4 pairs of long "tentacles" (tentacular cirri), 3 of which point backwards, and 1 forwards. In the front half, the back of the body, which is segmented as in all annelids, is also yellow with 3 brown spots per segment (one in the center, 2 on either side at the base of the parapodia). This gives the worm a stripy look. In the back half, the worm is entirely brown. The bottom side of the worm is a light turquoise colour and slightly iridescent. On each segment, the worm carries to leaf-shaped appendages, sometimes referred to as paddles.
Reposted by Hannes
natclarke.bsky.social
Felt a little festive at the microscope this morning for #FluorescenceFriday 🎄

Here’s the nervous system of a juvenile sea star ⭐️

Green = acetylated tubulin, red = nuclei

Happy holidays!
Confocal microscopy image of a juvenile sea star (Patiria miniata) viewed from the oral side. The animal has a five-armed, star-shaped body with a central nerve ring. The nervous system is labeled in green, forming radial nerve cords extending into each arm, and cell nuclei are labeled in red throughout the animal. The image appears against a black background and has a holiday-ornament-like appearance.
December 19, 2025 at 5:32 PM
federgeistchen.bsky.social
Happy new year! :D
I have no pictures of fireworks, but I have this one of a siliceous sponge skeleton from the university collection.

#MarineLife #Photography
Sponge skeleton against black background: The whole thing is tube shaped, only the upper third is visible, coming into the frame from the bottom right corner. At the end, the spicules form an organic web-like structure, fanning out towards edges. On the side, the spicules are arranges horizontally and vertically, forming rectangles. There are additional fan-like formations at regular intervals.
January 2, 2026 at 12:32 PM
Reposted by Hannes
xenomatt.bsky.social
A juvenile jack sheltering in a crystal jelly. They are part of the daily diel migration which brings plankton and associated critters up from the depths to the surface at night.
Pic from Balayan Bay, Anilao

#Fishmas #MarineLife 🌿🐟
A white fish with yellow bars and yellow fin rays. Its dorsal and anal fins have very long yellow filaments extending from them. It is sheltering in the tentacles of a round, translucent jellyfish with short tentacles. #Blackwater #UnderwaterPhotography #MacroPhotography #Macro #Wildlife #WildlifePhotography #Nature #NaturePhotography A white fish with yellow bars and yellow fin rays. Its dorsal and anal fins have very long yellow filaments extending from them. It is sheltering in the tentacles of a round, translucent jellyfish with short tentacles. #Blackwater #UnderwaterPhotography #MacroPhotography #Macro #Wildlife #WildlifePhotography #Nature #NaturePhotography
December 19, 2025 at 1:02 AM
federgeistchen.bsky.social
For the 17th day of #Crustmas, I have another water flea. This one was found in a tropical greenhouse. It's Macrothrix sp., but the exact species is probably not determinable without DNA analysis(?)

Look at the snoot! :D

#pondlife #microscopy
A brightfield image of Macrothrix sp. It's shape is roughly like that of a daphniid, but it has an elephant-trunk-like snoot and long spines at the posterior margin of the carapace. It is completely transparent, only the gut is slightly yellowish
December 17, 2025 at 5:47 PM
federgeistchen.bsky.social
A copepod for #Crustmas day 15 🦀
This one's a Calanoid copepod from Spain which I sadly do not know how to ID further ( Help much appreciated! :D )
The enlarged antenna segments are interesting as well. I have no idea what they are for and why they're only on one antenna.

#marinelife #copepod
A calanoid copepod under the microscope. It has very long antennae with one antennae having thickened and orange segments in the center. Apart from that, the copepod appears colourless
December 15, 2025 at 6:17 PM
federgeistchen.bsky.social
It's the fourteenth day of #Crustmas and I bring you another amphipod. I really like its slight blue and red colouration. :D
It is probably Apohyale perieri, but I'm not quite sure.

#MarineLife #Crustacean #Amphipod
Amphipod against a black background. The main colour is blue with red margins on each of the tergites. The eyes and antennae are reddish as well. The last two pairs of pereopods extend backwards and have white tips. Overall, the body is smooth and rounded.
December 14, 2025 at 7:07 PM
federgeistchen.bsky.social
Omg it’s so precious! #crustmas
December 14, 2025 at 8:41 AM
Reposted by Hannes
k-hermit.com
🦐☘,, #invertebrates
December 14, 2025 at 8:33 AM
federgeistchen.bsky.social
#Crustmas Day 13 🦀
I‘ve posted this species recently (about a month ago), but this one has a different colouration and not such an enlarged claw. This is Pisidia longicornis, the Long-clawed Porcelain Crab.

#marinelife #crab
Pisidia longicornis against a black background. A brown individual with a marbled patterning on legs and back. It has a round body with three long legs visible on either side as well as a pair of claws. The right claw is slightly enlarged. It has very long antennae and big, round, red eyes.
December 13, 2025 at 5:06 PM
federgeistchen.bsky.social
#Crustmas Day 12
Green Shromp!

It’s the Chamaeleon Prawn (Hippolyte varians) and very variable in colouration as the name suggests. I don’t know what influences colour, but all I found at that region were green.

#MarineLife #Shrimp
Green shrimp against a black background. It has a long pointy rostrum and very large scaphocerites. The telson and uropods are also pretty long. Sadly I didn’t manage to take a lateral photo as it was quite jumpy
December 12, 2025 at 8:12 PM
Reposted by Hannes
dhilrukshi.bsky.social
Slipper Lobster Metamorphosis

Crustaceans display some of the most spectacular metamorphoses from free-swimming meroplankton to reef-dwelling adults.

Slipper lobsters (below) are closely related to rock lobsters but have a flattened body and short, wide antennae.

#Crustmas
Slipper lobster larva - it looks like a translucent, spider-like creature with large eyes. Image: https://australian.museum/learn/animals/plankton/crustacean-metamorphoses/ Slipper lobster juvenile. Image: https://australian.museum/learn/animals/plankton/crustacean-metamorphoses/
December 9, 2025 at 1:02 PM
federgeistchen.bsky.social
Also for #Crustmas: Fluffy crab! (not actually a true crab)
Porcellana platycheles, the Hairy Porcellain Crab.

#MarineLife
December 10, 2025 at 5:51 PM
federgeistchen.bsky.social
For the 10th day of #Crustmas 🦐, I found this Scapholebris (cf. mucronata) Daphniid that is infested with Chlorella(?) green algae.

I believe, they are parasitic, judging by the Daphniid‘s reduced mobility & the strange twitching motion of the antennae.

#microscopy #pondlife #parasites #crustacean
December 10, 2025 at 5:38 PM
Reposted by Hannes
martynwarren.bsky.social
Procreate tracks the number of individual marks I make, and I’m currently on 66,816!
A progress screenshot of my tiger beetle drawing, showing that one elytra is nearly finished, but the beetle is still lacking some much-needed legs.
December 9, 2025 at 5:16 PM
federgeistchen.bsky.social
#Crustmas Day 9

This is one of the prettiest copepods I‘ve found. It‘s called Hersiliodes latericius and was found in coastal waters in Spain

#MarineLife #Copepods #Crustacean
A copepod against black background. It’s white/transparent with orange patterning and orange egg sacs.
December 9, 2025 at 4:53 PM
Reposted by Hannes
dadrummond.art
Omg #Crustmas
December 8, 2025 at 3:59 PM
Reposted by Hannes
xenomatt.bsky.social
A pair of Coleman Shrimp (Periclimenes colemani) in between the spines of a variable fire urchin.

#MarineLife #Invertebrates #Crustmas 🌿
Two shrimp on a sea urchin. The shrimp are white, with brown spots on their bodies and brown bands on their legs and claws. Both are facing the camera; one is much bigger than the other. The urchin has reddish skin, covered in white and brown banded spines with blue ends. #UnderwaterPhotography #Macro #MacroPhotography #Wildlife #WildlifePhotography #Nature
December 8, 2025 at 10:13 PM
Reposted by Hannes
noncompliantcyborg.bsky.social
Just think this gossamer worm needs a moment again 🐙🦑🐡
A gossamer worm swims past a colorful nebula, drawing its orange tail behind it.
December 9, 2025 at 6:10 AM
federgeistchen.bsky.social
For Day 8 of #Crustmas, I bring you Greenhouse isopods!
Back in June, the botanical gardens in Germany hosted a BioBlitz during which I got to dig around a bit in the greenhouses.

#1 Philosciidae indet.
#2 Nagurus cristatus
#3 Reductoniscus costulatus
#4 Venezillo parvus

#Isopods #MacroPhotography
A dark brown isopod sitting on a piece of bark. It has subtle markings on its back and rather long legs and antennae. They are also really fast. I found them in the Victoria lily house in the stony flower bed right next to the pool. A very ornate isopod sitting on a piece of mulch. Unfortunately the first half is out of focus. The pereon has a yellowish base colour with a broad grey center stripe that's sort of fractal-ly and grey margins. The pleon is fully grey. The pleotelson and uropods are bright yellow. A very tiny isopod sitting on some mulch. It is off white to beige in colour. Only the pereon is visible. Each tergite has two transversal rows of little teeth-like protrusions, which get bigger and more hooked further towards the posterior An ornate "pill bug" in a white collection dish. It is similar in colour and pattern to Nagurus cristatus, except that the yellowish parts on the tergites form distinct oval shapes. Editionally, the colouring continues through the pleon and pleotelson. It is also built more compactly and more rounded.
December 8, 2025 at 6:57 PM
federgeistchen.bsky.social
#Crustmas day 7 (belatedly) 🦀
I came back from a rehearsal weekend with my orchestra yesterday and I was too exhausted to post anything.

The pic I planned to send yesterday is this Xantho pilipes which has some very nice markings on its back, in my opinion

#marinelife #crab
A closeup of Xantho pilipes against black background. Its legs are fluffy (which has likely inspired the name "pilipes"). The back is white with a red marking in the middle that sort of looks like a space ship(??). The legs and claws are of an equal red with the tips being darker.
December 8, 2025 at 6:39 PM
federgeistchen.bsky.social
#Crustmas day 6! 🦐

I saw some posts with these ostracods (Strandesia sp.(?)) yesterday, so I wanted to share this one. Found in the greenhouses of the botanical gardens in Bonn. If anyone can help ID, that would be amazing! :D

#microscopy #ostracods #crustacean
A greenish pill-shaped ostracod with a big thorn-shaped ala. The rest of the animal can roughly be made out through the carapace. The margin of the carapace has small perforations as well as a few hairs.
December 6, 2025 at 12:23 PM
Reposted by Hannes
montereybayaquarium.org
Siphonophores are champions of community collaboration. 🤝🏆
This isn't one animal. It's actually a colony of individual animals called zooids. Each has a specialized role. From the orb-like swimming nectophores to the bright orange stinging tentacles, they're essential to the survival of all.
A translucent siphonophore drifts up to the left, with bubble-like orbs near the top of its body and dangling orange tentacles on the lower half.
December 5, 2025 at 10:01 PM
Reposted by Hannes
mossworm.bsky.social
I am loading all of the worlds' biodiversity databases with many pictures of things called "? Strandesia" because I don't have the heart to open up hundreds of indvidual ostracods to look at the adductor muscle scars, but they look a lot like this guy named Strandesia. I'm sorry.
Strandesia bicuspis is an oblong ostracod with a dorsal fin like extension of its shell valve. Photo is of a preserved specimen so it's mostly pale, but they're usually green in life
June 18, 2025 at 6:58 PM
Reposted by Hannes
nicknc.bsky.social
These little guys that I posted last December are still thriving in a water-filled saucer in my greenhouse.

Easy pets, if difficult to see and not at all affectionate.
A tiny freshwater crustacean, like a little seed with legs.
December 5, 2025 at 11:54 AM
federgeistchen.bsky.social
Day 5 of #Crustmas
Presumably a female Cymodoce truncata. No spoilers, but some individuals of this species have some really beautiful patterning (I‘m saving those pics for later) :P

#MarineLife #Isopods #Crustaceans
Pale brown isopod against a black background. It has a relatively sturdy build, two pairs of rather short antennae the posterior end is pointed. Its uropods (2 per side) end at about the same level as the point and are spaced quite far apart. It also has some red algae on its butt
December 5, 2025 at 1:36 PM