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submitted 1 month ago by Sal@mander.xyz to c/herpetology@mander.xyz

This is a Trachycephalus typhonius, formerly Trachycephalus venulosus, from Yucatan.

These frogs secrete a sticky and irritant milk-like fliud through its skin when bothered. Several years ago I got some some of that fluid into my eyes by accident - that hurts similar to scratching one's eye after touching a spicy pepper. So, they are not terribly toxic but I certainly do not recommend the experience.

Funnily enough I just ran a search and found a publication of someone who describes a similar but worse experience: https://www.thebhs.org/publications/the-herpetological-bulletin/issue-number-152-summer-2020-1/3101-09-a-caution-on-handling-i-trachycephalus-venulosus-i-anura-hylidae-toxic-effects-of-skin-secretion-on-human-eyes/file

You may notice that the finger pads of this frog look green. That's because its bones are green! A characteristic feature of this species. Here is a photo (not mine) of a skeleton of one of these : https://www.pybio.org/wp-content/uploads/2008/06/t-ven31.jpg

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submitted 2 months ago* (last edited 2 months ago) by Sal@mander.xyz to c/herpetology@mander.xyz

A new paper on a Bolitoglossid showed up in my alerts today! 🥳

It is a one-pager and comes with a beautiful photo of a foraging arboreal salamander 😄

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Imantodes cenchoa (mander.xyz)
submitted 2 months ago* (last edited 2 months ago) by Sal@mander.xyz to c/herpetology@mander.xyz

Found this Imantodes cenchoa sleeping on top of a leaf in Punta Laguna, Quintana Roo.

Here is a photo of where it was sleeping:

There are a few different snakes of the genus Imantodes in Yucatán. What sets this species apart is that the row of scales on its back consists of enlarged scales. Here is a closeup emphasizing that row of scales. The green arrow points at an enlarged mid-dorsal scale, the blue arrow at a regular scale.

In comparison, here is a photo from an Imantodes tenuissimus that I took back in 2009 in Mérida, Yucatán (with a less sharp camera), and a closeup of its mid-dorsal scales that does not show this enlargement.

Imantodes tenuissimus

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submitted 2 months ago* (last edited 2 months ago) by Sal@mander.xyz to c/herpetology@mander.xyz

One of my favorite frogs! Spent some time specifically looking for it. Managed to find two near Cobá, in Quintana Roo (in the Yucatán peninsula). This frog hides in holes in lime stone and tree trunks, and makes use of its flat head to block the entrance. This type of defense is known as phragmosis.

Some other shots:

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Anole sleeping (mander.xyz)
submitted 2 months ago by Sal@mander.xyz to c/herpetology@mander.xyz

Found this anole in Yucatan. I am not sure of its exact species - probably an Anolis sp..

Anoles often sleep at the tips of leaves and twigs. My guess is that this is a strategy to prevent nocturnal predators sneaking up on them through the branches without making its bed vibrate. When woken up they can quickly drop down.

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Leatherleaf slug (mander.xyz)
submitted 2 months ago by Sal@mander.xyz to c/invertebrates@mander.xyz

These are quite common in Yucatan, Mexico.

The leatherleaf slugs belong to the family Veronicellidae. This particular one could be Sarasinula plebeia, but it is not so easy to definitively ID these.

I originally identified this species a few years ago from the description on this website, but since then they have added an update stating that my original source is also unsure on this one.

UPDATE: It seems that IDing certain slugs by pictures isn’t a good idea. In 2024 when pictures on this page were uploaded to iNaturalist, another user suggested a different species in the genus Leidyula, and then user “deneb16,” a mollusk specialist at UNAM, Mexico’s main university, added the comment that all Mexican species of the family this slug belongs to can’t be identified without dissecting their sexual organs. The family, she agrees, is the Leatherleaf Slug Family, the Veroncellidae.

So, I am not 100% of the species, but it is a leatherleaf slug.

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submitted 3 months ago by Sal@mander.xyz to c/herpetology@mander.xyz

adult greenhouse frog

baby greenhouse frog

Found many of these frogs under a wet trash bag in a back yard in Mérida, Yucatán. I made use of a handheld flash with a remote trigger for lighting, and a Sigma 105 mm as my macro lens.

These frogs do not seem to match with any of the local frogs reported in Julian C. Lee's field guide to the amphibians and reptiles of the maya world.

From a reverse image search, I mostly found images of the green house frog Eleutherodactylus planirostris. Eleutherodactylus planirostris is native to Cuba and the Bahamas, and is often introduced with plants that come from green houses in those areas. These frogs go from tadpole to frog while still inside of the egg, which explains why the baby frogs are so small.

The visual aspect, the incredibly small baby frogs, and the fact that they were found in a back yard in the city with greenhouse plants, all lead me to conclude that it is likely Eleutherodactylus planirostris.

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submitted 5 months ago by Sal@mander.xyz to c/earthscience@mander.xyz
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submitted 5 months ago by Sal@mander.xyz to c/herpetology@mander.xyz
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Prey specificity of predatory venoms (onlinelibrary.wiley.com)
submitted 5 months ago by Sal@mander.xyz to c/biology@mander.xyz
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submitted 5 months ago by Sal@mander.xyz to c/herpetology@mander.xyz
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submitted 6 months ago* (last edited 6 months ago) by Sal@mander.xyz to c/herpetology@mander.xyz
[-] Sal@mander.xyz 34 points 9 months ago

If the timing is right, I would bring a mushroom grow bag with mushrooms sprouting.

If not... probably my radiacode gamma spectrometer and some of my radioactive items. Maybe a clock with radium painted dials and a piece of trinitite. I think that there are many different points of discussion that can be of interest to a broad audience (radioactivity, spectroscopy, electronics, US labor law story of the radium girls, nuclear explosions, background radiation.... etc). As a bonus I can bring a UV flash light and show the radium fluorescence. Adults love UV flash lights.

[-] Sal@mander.xyz 50 points 9 months ago* (last edited 9 months ago)

I think that they are referring to Paxillus involotus

It is quite an interesting mushroom. It was considered "safe to eat" for a long time, but it contains an antigen that a human's immune system can learn to attack.

The antigen is still of unknown structure but it stimulates the formation of IgG antibodies in the blood serum.

I once looked into whether this immune response builds up over many exposures, or if it is a random event that has a probability of happening for each exposure. I don't remember finding a convincing answer... If it is a random event, then mushroom could be considered a "Russian roulette" mushroom that will usually provide a nice meal, but, if unlucky, you may experience the following:

Poisoning symptoms are rapid in onset, consisting initially of vomiting, diarrhea, abdominal pain, and associated decreased blood volume. Shortly after these initial symptoms appear, hemolysis develops, resulting in reduced urine output, hemoglobin in the urine or outright absence of urine formation, and anemia. Hemolysis may lead to numerous complications including acute kidney injury, shock, acute respiratory failure, and disseminated intravascular coagulation. These complications can cause significant morbidity with fatalities having been reported.

I agree with you that this is probably unrelated to the "generally similar to humans" comment. I feel like this fantasy is a combination of the above fact mixed in with the fact that the Fungi belong to the Opisthokonts, which places them closer to animals than plants, and so they share some interesting cellular characteristics with us. This places them closer to animals than plants, but "generally similar to humans" is perhaps a bit of a stretch ^_^

But, it is just a meme about a guy being hyped about mushrooms. Hopefully people don't expect memes to be super accurate 😁

[-] Sal@mander.xyz 30 points 9 months ago

First of all, congratulations for bringing a baby girl into this world!! You must be really excited! I am very happy for you!

This looks very cool. I set up a wiki (https://ibis.mander.xyz/) and I will make an effort to populate it with some Lemmy lore and interesting science/tech 😄 Hopefully I can set some time aside and help with a tiny bit of code too.

[-] Sal@mander.xyz 30 points 9 months ago

The authors of the paper uploaded 6 videos in the supporting info. It looks like mucus to me, but it is difficult to see. I cropped one video in which you can see strings of the "milk": https://i.imgur.com/9RvVSgz.mp4

You can get the zip file with the 6 videos here: https://www.science.org/doi/suppl/10.1126/science.adi5379/suppl_file/science.adi5379_movies_s1_to_s6.zip

I also found a video of a frog feeding its tadpoles through the skin: https://static-content.springer.com/esm/art%3A10.1007%2Fs10682-023-10259-z/MediaObjects/10682_2023_10259_MOESM2_ESM.mp4

The frog video comes from this paper: https://link.springer.com/article/10.1007/s10682-023-10259-z

[-] Sal@mander.xyz 30 points 10 months ago

Search engines like google aggregate data from multiple sites. I may want to download a datasheet for an electronic component, find an answer to a technical question, find a language learning course site, or look for museums in my area.

Usually I make specific searches with very specific conditions, so I tend to get few and relevant results. I think search engines have their place.

[-] Sal@mander.xyz 29 points 11 months ago

There is one account that has a single comment from 5 months ago that is downvoting most posts and comments. That one is very suspicious

Other than that... No other accounts are as obvious. A few do have some reoccurrences but most of those votes do seem organic on first inspection.

[-] Sal@mander.xyz 42 points 1 year ago* (last edited 1 year ago)
  • Password hashing occurs server-side. Even without removing the hashing step an admin can intercept the plaintext password during login. Use unique safe passwords.

  • An admin can intercept the jwt authentication cookie and use any account that lives in the instance.

  • Private messages are stored as plaintext in the database

  • Admins can see who upvotes/downvotes what

  • These are not things that are unique to Lemmy. This is common.

  • To avoid having to trust your admin, run an instance.

[-] Sal@mander.xyz 31 points 1 year ago* (last edited 1 year ago)

Full genome sequencing.

The price of sequencing continues to decrease as the technology evolves. I have already seen claims of under $1,000 for a full human genome. I haven't looked carefully into those claims, but I think we are around there. In some years full genomes will be so cheap to sequence that it will be routine. I want to buy one of those small Oxford Nanopore MinION sequencers in the future. I'll use it like a pokedex.

[-] Sal@mander.xyz 28 points 1 year ago* (last edited 1 year ago)

We may have reached peak archaeology now, but human society peaked around A.D. 550 in Mexico

[-] Sal@mander.xyz 30 points 1 year ago* (last edited 1 year ago)

Cool. Thank you for doing this!

[-] Sal@mander.xyz 54 points 1 year ago

Really cool! I'm excited to learn more about you and the project!

What's the format? Should we submit questions beforehand, or will you process questions that arrive at the start time? I've never participated in an AMA 😅

[-] Sal@mander.xyz 48 points 2 years ago* (last edited 2 years ago)

My view is: I don't like this cultural element, and I am glad that I live in a country without it. But if I am a visitor from abroad I would not resist the local culture and try to impose my own values. If I am aware of this cultural element and I dislike it, my options would be to either avoid restaurants and other tipping situations as much as I can, or simply account for the tip when making my financial decisions, and pay it.

If I live in the country then it is different, because then I am more entitled to be a driver of change. Personally, my approach would be to support businesses with explicit no-tipping policy, and to refuse receiving tips myself.

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Sal

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