The glass katydid

November 6, 2013 • 12:23 pm

If you’re a photographer, insect aficionado, or both, you should be checking Harvard biologist Piotr Naskrecki’s website The Smaller Majority.  There you’ll find some of the most amazing animals in the world, all photographed with loving care.

The latest oddity is the glass katydid (Phlugis teres, described in 1773) from the Neotropics. As it ages it changes from completely transparent to green. As Piotr notes:

I coined the name Glasss katydid after seeing for the first time young nymphs of Phlugis teres, a species found in Suriname, who display remarkable, nearly complete transparency of their bodies. These minute insects truly look as if they were made of glass and, peering closely, it is possible to see most of their internal organs, including the entire tracheal system. Unfortunately, these katydids lose most of the transparency as they get older, and eventually acquire pale green coloration, occasionally marked with brown accents.

The nymph sitting on Piotr’s finger (all photos copyright by Naskrecki and used with permission):

phlugis_nymph

It’s not clear (pardon the pun) whether this change in transparency is a direct adaptation or simply a byproduct of something else. I’m not aware of other insects that do this (correct me if I’m wrong), although perhaps in this species the nymphs live in places different from adults.  The green-ness of the adults, pervasive in katydids, probably hides them from both predators and prey.

More on this species from Naskrecki:

Glass katydids are sit-and-wait predators who spend most of the day sitting upside down on the underside of large, thin leaves, usually at the edge of the rainforest or in open, shrubby habitats. They prefer leaves that are fully exposed to the sun so that any insect landing on its upper surface will cast a dark, sharply defined shadow. And that shadow is what Glass katydids are waiting for – it tells them whether the insect is a hard beetle (not good) or a soft fly (excellent), and if the insect looks like a good meal they launch themselves from under the leaf and onto its surface, and capture the victim with their long, very spiny legs in a blink of an eye.

Check out the spines:

phlugis_nymph2
(Naskrecki’s caption): As they age, Glass katydids begin to lose their transparency, and older nymphs and adults acquire pale green coloration.

The species is notable for one other thing: its high-pitched sound:

In addition to being some of the most sophisticated and fastest orthopteran predators, Glass katydids are famous for the sound they produce – their call exceeds the frequency of 55 kHz, which is about three times the frequency a human ear is capable of hearing. A closely related genus Archnoscelis holds the record of producing the highest frequency call among all invertebrates – a whopping 129 kHz, twice the frequency of echolocation of most bats, and about 10 times more than the hearing ability of most adult humans. Another reminder that the ability to look cool and do amazing things seems to be inversely correlated with the body size.

Piotr has discovered a new and yet unnamed species of katydid in Mozambique, which he’ll post about soon.  He gives a photo of another new and unnamed species from Costa Rica:

phlugis_cr
(Piotr’s caption): Their huge eyes are a good indication of Glass katydids’ mode of hunting – they are diurnal sit-and-wait predators of small flies and other soft insects. This newly discovered, yet unnamed species of Phlugis from Costa Rica hunts small flying insects along the edges of mid-elevation rainforest.

Katydids, by the way, are in the order Orthoptera, along with grasshoppers, locusts, and crickets, but, within that group, they’re members of the family Tettigoniidae. It would do you good to look over the orders of insects. Some you’ll know already, but you might pick up a few other names. There will be a pop quiz.

Shermer and Harris pwn Chopra at Caltech

November 6, 2013 • 9:56 am

I’ve deliberately neglected Deepak Chopra for most of my life, as I don’t need the tsouris.  But now, after having listened to him more and more, I find out that he’s not only a dreadful purveyor of woo, but also a pretty nasty guy when he’s challenged.

In this ten-minute clip, apparently filmed at Caltech, Shermer and, especially, Sam Harris, simply take Chopra’s woo-peddling to pieces.  Chopra comes off looking really bad. And he won’t let other people talk.

In truth, I think any of us could fabricate and peddle the same stuff that Chopra does, and make a million dollars doing so. As Harris says, “This is a game. . . for people who don’t know much about science and how science is done.”

Lots of people seem to vilify Sam for his views, something I don’t fully understand since I think they often distort those views; but one thing can’t be denied: on the debating platform, Sam is the true heir of Christopher Hitchens.

The BBC and Chopra buy into woomeister Rupert Sheldrake’s “Galileo syndrome”

November 6, 2013 • 6:43 am

Rupert Sheldrake is a pseudoscientist who has made his name promoting various kinds of woo, including telepathy (including in d*gs!), immaterial minds, and his crazy idea of “morphic resonance,” a Jung-ian theory in which all of nature participates in some giant collective memory. (He was once a real scientist, trained in biochemistry and cell biology at Cambridge, but somehow he went off the rails.)

I’ve crossed swords with Sheldrake before when I campaigned against his Tedx talk, which was filled with his crazy ideas. I and several others pointed out that what he said violated the mission of Tedx to present innovative but sound science. This resulted in TEDx taking Sheldrake’s talk off of their website and putting it in a special “time out” room for misbehaving woomeisters.

I’m sure most of you know of Sheldrake. He enjoys a certain popularity in the US and UK among those who think that there must be “something more out there”—with “more” meaning psychic phenomena. I don’t really understand a penchant for things that aren’t supported by evidence, but that’s probably a failure of empathy on my part as well as a product of my scientific training. I am sure, though, that some of the same psychological tendencies that promote sympathy for woo also promote sympathy for religion.

Sheldrake and his supporters always defend themselves as beleaguered scientists whose correct theories are unfairly attacked or neglected because they buck the current “materialistic paradigm.” That is, he thinks himself an unrecognized and persecuted Galileo figure. The proper answer to this is given on the NeuroLogica website:

The definitive assessment of this comparison comes from the original version of the movie, Bedazzled (highly recommended). Dudley Moore’s character calls Satan a nutcase (for claiming to be Satan), and Satan replies, “They said the same of Jesus Christ, Freud and Galileo.” Moore then replies, “They said it of a lot of nutcases too.”

Last summer someone decided to fix Sheldrake’s Wikipedia article, which, edited by his supporters, had been promoting Sheldrake’s woo in violation of Wikipedia policies on fringe science and pseudoscience. Perhaps you don’t know about these policies, but you can read about them at the link. That discussion begins like this:

When discussing topics that reliable sources say are pseudoscientific or fringe theories, editors should be careful not to present the pseudoscientific fringe views alongside the scientific or academic consensus as though they are opposing but still equal views. While pseudoscience may in some cases be significant to an article, it should not obfuscate the description or prominence of the mainstream views.

It’s a pretty good policy, and prevents people like Sheldrake and his deluded supporters from editing Wikipedia articles to give unwarranted credibility to their pseudoscience. And that policy allowed the rationalists to come in and clean up Sheldrake’s page, which they did.

Sheldrake eventually noticed his new, non-woo-spouting page, and responded in October on his own blog (“Science set free”) with a paranoid post called “Wikipedia under threat”. A sample:

This summer, soon after the TED controversy, a commando squad of skeptics captured the Wikipedia page about me. They have occupied and controlled it ever since, rewriting my biography with as much negative bias as possible, to the point of defamation. At the beginning of the “Talk” page, on which editorial changes are discussed, they have posted a warning to editors who do not share their biases: “A common objection made by new arrivals is that the article presents Sheldrake’s work in an unsympathetic light and that criticism of it is too extensive or violates Wikipedia’s Neutral Point of View policy.”

If you want some amusement, have a look at the Wikipedia “talk” page on Sheldrake’s bio. It will give you a newfound respect for Wikipedia editorsas the skeptics are over there are just trying to make sure, as per Wikipedia policy, that Sheldrake’s pseudoscience is not presented as credible science.

Sheldrake continues his rant on his website, blaming the editing of his page on the “Guerilla Skeptics,” a group dedicated to policing dubious pseudoscientific claims and giving skeptics themselves decent Wikipedia pages. Sheldrake writes:

The Guerrilla Skeptics are well trained, highly motivated, have an ideological agenda, and operate in teams, contrary to Wikipedia rules. The mastermind behind this organization is Susan Gerbik [sic]. She explains how her teams work in a training video. She now has over 90 guerrillas operating in 17 different languages. The teams are coordinated through secret Facebook pages. They check the credentials of new recruits to avoid infiltration. Their aim is to “control information”, and Ms Gerbik glories in the power that she and her warriors wield. They have already seized control of many Wikipedia pages, deleted entries on subjects they disapprove of, and boosted the biographies of atheists.

The “ideological agenda” here, though, is simply that false or unsupported claims not be presented as the truth. If that’s an agenda, I’m all for it.

But Sheldrake is dead wrong in his accusations. The person who did most of the woo-removing edits of Sheldrake’s page has posted an article decisively refuting the claim that there is a Guerrilla Skeptic “conspiracy” to debunk Sheldrake (the author says that he/she is not a member of this group, nor were they involved). Further, Tim Farley of Skeptical Software tools has investigated the edits thoroughly and confirmed that  no Guerrilla Skeptics seem to have been involved. Finally, Farley checked with the GSoW boss, Ms. Gerbic, who denies involvement. Farley concludes:

. . . the central claim, that Guerrilla Skeptics are controlling Sheldrake’s bio, is demonstrably false.  It is a classic conspiracy theory. I asked Susan Gerbic directly, and she confirmed that Sheldrake’s bio was not on their current project list. But you don’t need Susan’s word, just search for the name “Sheldrake” at the project blog and you find only a post about a related article, and no indication they had worked on Sheldrake’s bio. (Believe me, they’re not shy about showing off their work – it’s part of their outreach efforts).

Look in the editing history of the people actually editing Sheldrake’s article, and you’ll find only cursory overlap with articles the guerrilla skeptics have bragged about editing.

So Sheldrake and Weiler et. al. are actually complaining about the wrong thing entirely! Instead of floating conspiracy theories about the Guerrilla Skeptics, they should be studying the Wikipedia rules and trying to understand why it is their edits keep getting rejected.

Sheldrake not only paints himself as a martyr again, but singles out the wrong group for “persecuting” him.

Sadly, now the the BBC World Service itself is being played a fool by Sheldrake, as they have put The Woomeister on their station to proclaim his conspiracy theories.

If you go here on the BBC, and listen to the 5-minute interview with Sheldrake (starts 8:02, ends 12:44), you’ll see the sympathetic ear that the BBC interviewer lends to Sheldrake, not questioning his claims in the least.

Much of what Sheldrake says in the interview is untrue, and it’s all in service of telling the world not to believe his Wikipedia page as it was sabotaged by Guerrilla Skeptics, which also is “distorting hundreds of pages on Wikipedia.” That is a lie, and Sheldrake should know better because that segment was broadcast only 5 days ago, after, three weeks after Farley’s piece was published. Nor does the BBC interviewer talk to the Guerrilla Skeptics, seek any contrary views, or ask Sheldrake any hard questions. The interviewer apparently didn’t investigate this whole issue beforehand. It’s just dreadful reporting. To be fair, the BBC says that they’ll talk about the “reliability of Wikipedia and Sheldrake’s Wikipedia page” this week. If anybody hears that segment, let us know. [Note: Matthew Cobb points out to me that the BBC interviewer, Dan Damon, describes himself and his wife as “keen churchgoers.“]

But I’m wondering why the BBC gives Sheldrake a voice at all. Why do their readers need to hear his paranoid rants? Would they allow a creationist to go on the air and argue that mainstream biologists are in a conspiracy to suppress the truth of a young earth and creation ex nihilo?

Finally, Sheldrake’s American counterpart, Deepak Chopra, has written a piece on his own website decrying Wikipedia skepticism and the persecution of Sheldrake. Indeed, it takes one purveyor of woo to understand another. In a piece called “The rise and fall of militant skepticism,” Deepak writes

You can see the results at the Wikipedia entry for Rupert Sheldrake, the British biologist who has served as a lightning rod for militant skeptics for several decades. Intelligent, highly trained, an impeccable thinker, and a true advocate for experimentation and validation, Sheldrake had the temerity to be skeptical about the everyday way that science is conducted. He made his first splash by questioning the accepted assumptions of Darwinian evolution, and most recently he published a cogent, well-received book about the hidden weaknesses in the scientific method, titled Science Set Free. His avowed aim is to expand science beyond its conventional boundaries in the hope that a new path to discovery can be opened up.

But you’d never know it from Sheldrake’s Wikipedia entry, which is largely derogatory and even defamatory, thanks to a concerted attack by a stubborn band of militant skeptics. Since I am close to Sheldrake personally and have Wikipedia woes of my own, it’s not fair for me to offer accusations over the extent to which Wikipedia is under attack. But the skeptics have been caught in the act, which is the pickle they find themselves in, as I mentioned at the outset of this post.

You can read a detailed account in a series of online posts written by Craig Weiler at his blog The Weiler Psi. Confronting the militant pests at Wikipedia resembles taking hold of a tar baby, as Weiler relates in his most recent post, pointedly entitled “Wikipedia: The Only Way to Win Is Not to Play.” The unsavory fact is that skeptics have figured out how to game Wikipedia’s attempts to provide fairness, and we are all the loser for it.

Steve Novella has written a cogent takedown of the paranoia of both Chopra and Sheldrake on a post on Skepticblog called “Chopra shoots at skepticism and misses.” Novella also has a few interesting words about whether the idea of God is a testable hypothesis.

There is, I suppose, a form of “militant skepticism” that is so skeptical that it won’t accept anything. But I’m not aware of anyone adhering to that view, except perhaps some postmodernists. Others are skeptical of some things that are, to all reasonable people, demonstrably true (there are some of these). But the critics of Sheldrake and Chopra are not “militant skeptics.”They are simply people who demand evidence for bizarre claims of psychic phenomena and universal consciousness.

Let’s face it: we’ll never be free of people who lap up the woo of people like Chopra and Shedrake. There’s something about human psychology that is susceptible to this kind of stuff. All we can do is decry it as often as we can, and hope that those on the fence will listen to us. That is what Steve Novella and the Guerrilla Skeptics are doing, and more power to them.

h/t: Darren

Fly with ant-mimic wings

November 5, 2013 • 12:17 pm

Several readers have called my attention to yet another amazing case of mimicry, this time in a tephritid fly (the “true” fruit flies). Most people became alerted to this by a semi-viral tw**t by Ziya Tong, which notes that “Goniurellia tridens is a 3-in-1 insect,” and that the photo below was taken by Peter Roosenschoon in Dubai. Roosenschoon is a conservation officer at the Dubai Desert Conservation Reserve.

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Those aren’t ants bedecking the fly’s wings; they’re the normal wing markings of this species. But why would a fly have antlike markings on its wing? [UPDATE: Note comments at bottom where an ant expert and two others (including Matthew) think that these are spiderlike markings.  I’m coming around to that point of view.]

The issue is discussed in a New York Times‘s “Dot Earth” column by Andrew Revkin, which refers back to the original article in the original article by Anna Zacharias in The National, a United Arab Emirates newspaper. Zacharias describes it:

The image on the wing is absolutely perfect,” says Dr Brigitte Howarth, the fly specialist at Zayed University who first discovered G tridens in the UAE. [JAC: the species has been known since 1910, and is found in the Near and Middle East, Asia, and Asia.]

. . .In the UAE alone, 27 picture wing species are known. Some have wings bearing simple shapes but others, like G tridens, are far more complex.

Dr Howarth first saw G tridens on an oleander shrub in northern Oman. “I was looking at the stem of the leaves and I noticed that there were some insects crawling around. When I sort of honed in I started to notice what I thought was a couple of ants moving around.”

At first she suspected an infestation on the fly’s wings. “But it was so symmetrical that I thought, ‘oh this is not possible’. When I got it under the microscope I realised that these were insects painted onto the wings.”

In contrast to its wings and brilliant green eyes, the fly’s body is a dull greenish grey – “almost cryptically coloured,” says Dr Howarth – that blends into the leaves where it is found

Here’s a photo (uncredited) of a pinned specimen from The National:

Screen shot 2013-11-05 at 4.54.26 AM

But why the ant markings? Howarth, interviewed by Zacharias, explains:

When threatened, the fly flashes its wings to give the appearance of ants walking back and forth. The predator gets confused and the fly zips off.

That doesn’t make a lot of sense to me.  Why doesn’t the fly just “zip off” by flying away when it sees a predator? Confusing a predator by waving your wings just wastes time.  Now some tephritids have spider-like markings on them, and that makes more sense.  Apparently the predator is a jumping spider, and when it sneaks up on a fly, it sees the spider markings, mistakes them for another spider of its species, and displays to it. That display gives away the spider’s presence, allowing the fly to get away.  But I can’t see this happening with ants.

Howarth also suggests a sexual function:

This defence mechanism may also make the fly attractive to potential mates – something that is less of a concern for the average housefly.

“A lot of flies, if a male sees a female that is suitable it just flies up and tries to latch on,” said Dr Howarth. But G tridens has an altogether more amorous courtship, showing off its wings in a colourful dance. And Dr Howarth believes it is no exception.

“If you look at the behaviour, it tells you a lot about the functionality,” said Dr Howarth. “Not everybody gets to mate. The ones that do have something about them that make them more attractive.

“Is it the same in other invertebrates, who knows? It’s very possible that those are in fact for courtship behaviour.”

That makes even less sense.  Yes, marks on the wings can help courtship, but why would ant-shaped markings on the wings be necessary for that? It’s not like females are attracted to ant shapes because the flies eat ants, because they don’t. No, there’s something here about the resemblance to the ants that facilitates the fly’s survival or reproduction.  Howarth’s final statement doesn’t make a lot of sense to me, either:

This elaborate behaviour may be a response to the fly’s restrictive environment. “Something that can survive anywhere doesn’t need to have as many protection factors,” said Dr Howarth.

The more realistic the picture on the wing, the better its chance of survival and reproduction.

The truth is that we don’t really know why this fly has antlike markings, but we can predict that studying how the fly uses its wings, and knowing more about its ecology, will suggest some testable hypotheses. I’m too harried to think about alternatives now, but I bet some readers, particularly our entomologists and field biologists, can suggest an evolutionary explanation for ant markings.

Finally, here’s a flickr picture by Drew Gardner (I cropped it a bit), who notes, “Another pictured wing fly. This is a small fly about 3 mm long which came to the mercury vapour light. Each wing has an almost perfect picture of an insect, complete with head, thorax and abdomen and six legs.”

Screen shot 2013-11-05 at 5.01.24 AM

h/t: Diana MacPherson, Matthew Cobb, and several others I’ve forgotten (sorry!)

____

EDIT from Matthew Cobb: Not everyone agrees with the ‘ant’ diagnosis. Starting with ant supremo Alex Wild (a.k.a. @Myrmecos). The following discussion took place on Tw*tter.

https://twitter.com/CMBuddle/status/397804207765331969