The amazing flies of the genus Richardia: sexual selection taken to extremes

January 28, 2017 • 7:30 am

I have a decent backlog of readers’ wildlife photos, but not enough to make me comfortable, so be sure to keep sending in your good pictures.

Today we’re taking a hiatus and featuring the amazing photographs of photographer and entomologist Gil Wizen, taken from his eponymous website (with permission; note that he also has a Twitter page and a Facebook page). I especially like these photos because they show the effect sexual selection can have on flies: in this case flies in the genus Richardia (the post from which I took these photos is “Photographing Richardia: a long way to victory“).

Gil’s photos were taken in Ecuador, and feature some really cool flies. (Note that these are copyrighted, and you must ask permission for both commerical or noncommerical reproduction.) Here, for instance, is an “antlered fly”, with Gil’s description (indented):

Males have antler-like projections from their eyes, which are used for pushing an opponent during a combat over territory or a mate. The female Richardia lacks those projections, but is characterized by a telescopic ovipositor at the tip of her abdomen, used for injecting eggs into fruits and other plant tissue.

The site also has an awesome close-up of the antlered head itself, so go over and see that. Here are the males: dorsal and frontal views. Note that the “antlers” are projections of the head itself, and are not antennae or aristae, which stick out straight in front in the first photo:

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Richardia also includes ‘hammerheaded’ flies, in which the males (but not females) have their heads elongated laterally, resembling (but not related to) the “stalk-eyed flies” (diopsids).  The fact that only males have wide heads is a clue that sexual selection is going on, and indeed it is: in the form of male-male competition. As Gil notes:

The hammerhead Richardia can sometimes be seen on the underside of broad leaves such as those of banana and heliconia plants. Males engage in head-pushing tournaments while a single female usually stands by watching and waiting for the winner to approach. He will then display a short dance, running in circles and waving his decorated wings, before mating with her.

Clearly males with bigger heads have an advantage here; that’s what’s driven both the elongated heads and the sexual dimorphism. Here’s a male:

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And a female of the same species, having a “normal” head:

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Just to show the lengths to which sexual selection can go, below is a male from a different fly genus. Yes, those are the eyes on the tip of its head, and surely this design is not only maladaptive for fly vision, but also for flight. (If it were visually and aerodynamically good, the females would have it too.) Gil’s caption:

Male hammerhead fly (Plagiocephalus latifrons), dorsal view. One of the most amazing fly species out there in my opinion!

The behavior of this fly isn’t described, but I would bet $100 that the males engage in head-butting contests or “my head is bigger than yours” comparisons, with bigger-headed males generally winning. Of course, selection will only proceed to the point where the sexual advantage of having an even longer head is counterbalanced by natural selection against that lengthening, probably based on metabolic, visual, or aerodynamic constraints.

Look at that head!!:

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Gil wondered, as did I, how these huge heads could possibly fit into a pupal case. I guessed, based on the fact that flies also expand their wings after they hatch, that these males can also expand their heads after “eclosion” (hatching from the pupal case). That in fact is what happens. In the amazing BBC video below, also posted by Gil (narrator sounds like David Attenborough), you see a stalk-eyed fly right after hatching. It gulps air bubbles and forces them into its head to expand the eyestalks!

Thanks to Gil for permission to use the photos and Matthew Cobb for calling my attention to Gil’s post.

Snarky aside: as one reader below noted, some misguided souls might suggest that this sexual dimorphism isn’t the result of evolution, but is simply a social construct: males are raised to have long eyes! Well, we know that can’t be true (how do we know that?). At any rate, male-male competition is also a likely a behavior that, imposing sexual selection, led to sexual dimorphism in body size in our own species, with males being larger and having more muscle mass than females.  Imagine what human males would look like if they had to head-butt to win a mate!

Saturday: Hili dialogue

January 28, 2017 • 6:30 am

Good morning on a chilly Saturday (in Chicago): greet January 28, 2017. It’s National Blueberry Pancake Day, and I’ll add that to this wonderful breakfast treat you must add real butter and a drizzle of good maple syrup (preferably the darkest grade). It’s also Data Privacy Day (known as “Data Protection Day” in Europe), so remember not to give out compromising or secure things (if you’re in the U.S., NEVER give out your Social Security number on the phone, particularly during tax season). Beware of robot calls purporting to be from the Internal Revenue Service: I got four of those last year but knew they were a scam. Note that the IRS will never call you, so these calls are always attempts to steal your money.

Today is also the beginning of Chinese (Lunar)New Year; and there’s a Google Doodle; or should I say a Google Cock-a-Doodle? For it’s the Year of the Rooster, and if you don’t know your year, look it up (I’m a stalwart Ox).

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On this day in 1547, Henry VIII of England died at the age of 55, a death probably hastened by obesity. His 9-year-old son became King Edward VI. In 1813, Jane Austen’s Pride and Prejudice was first published, and 7 years later a Russian expedition discovered Antarctica. On January 28, 1935, Iceland became the first Western nation to legalize therapeutic abortion. 1935! It’s also one of the world’s six most atheistic nations. On this day in 1956, Elvis Presley first appeared on US television. No, it wasn’t his famed (and censored) appearance on The Ed Sullivan Show, but a stint on CBS’s “Stage Show.” In 1965, the Canadian Parliament approved the current design for the Canadian flag (I think it should have a beaver rather than a maple leaf).

Real flag:

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Better flag:

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And, a sad day in 1986: the space shuttle Challenger blew up, killing Gregory Jarvis, Christa McAuliffe, Ronald McNair, Ellison Onizuka, Judith Resnik, Dick Scobee, and Michael J. Smith. I remember watching it live, with everyone uncomprehending and hoping beyond hope that nobody was hurt, even after the outcome was clear.

Notables born on this day include Henry Morton Stanley (1841), Colette (1873), Claes Oldenburg (1929), Alan Alda (1936), and Rick “Purpose Driven” Warren (1954). Those who died on this day, include beside Henry VIII and the seven Challenger astronauts, Charlemagne (814, probably wrong calendar) and W. B Yeats (1939), one of my favorite poets. Here’s Yeats’s grave in Drumcliff, Ireland; the inscription, penned by Yeats himself, comes from the final stanza of his great poem “Under Ben Bulben“:

Under bare Ben Bulben’s head
In Drumcliff churchyard Yeats is laid,
An ancestor was rector there
Long years ago; a church stands near,
By the road an ancient Cross.
No marble, no conventional phrase,
On limestone quarried near the spot
By his command these words are cut:
               Cast a cold eye
               On life, on death.
               Horseman, pass by!

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Meanwhile in Dobrzyn, Hili is taking apart a familiar Latin phrase (click the link if you don’t know it or who said it):

Hili: You are always thinking that you are unique.
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In Polish:
Ja: Errare humanum est.
Hili: Zawsze wam się zdaje, że jesteście tacy wyjątkowi.

Friday genitalia FTW

January 27, 2017 • 2:45 pm

Patricia Brennan is an evolutionary morphologist who teaches at Mt. Holyoke College (her website is here), and her speciality is animal genitalia. As the locus of morphological contact during reproduction, one would expect both natural and sexual selection to act very strongly on genitalia, and indeed they have (see William Eberhard’s underappreciated book Sexual Selection and Animal Genitalia). I suppose that because of a stigma attached to genitals, they aren’t studied nearly as much as they should be by evolutionary biologists. Here’s a video of Brennan and some of her work, first published at the xxfiles in Science.

Although biologists have concentrated on male genitalia, as those are often the most easily seen diagnostic features of related insects (that itself speaks to the importance of sexual selection, for why should genitals change so quickly compared to other traits?), Brennan also looks at the vaginas, which, being internal, are harder to see. She uses silicon molds to define their shape.

The male mako shark genitals described at 1:40 are way cool, and the spines on them probably show some kind of antagonism between male and female during copulation: the male wants to hold on to inject his sperm, but the spines don’t allow a female to reject such a male, and may damage her as well. You want more? Read about “traumatic insemination,” evolution’s version of Fifty Shades of Grey.

Brennan specializes in duck genitals, which can often be amazingly long and contorted (see one of her short videos at the Science page).

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Pence: evolution denialist

January 27, 2017 • 1:15 pm

Ladies and gentlemen, if you’re an American, hear the words of your new Vice President as he disses evolution. The first one is from 2002, with Pence emoting on the floor of the House of Representatives. Pence is making that old argument that evolution is “only a theory,” which is clear when he argues that evolution is not a FACT. By now we should all know what a genuine scientific theory is—and it’s not just a guess or an idle speculation.  He then asks that “other theories of the origin of species” be taught, like the creationism adhered to by this nation’s founders—a creationism described in the book of Genesis—or the “theory of intelligent design.” He then says that the “truth of faith” will become apparent, whatever that means.

Yes, ladies and gentlemen, brothers and sisters, comrades: here is your Vice President:

(See some quotes at alternative media syndicate).

And here’s Chris Matthews boring into Pence as he waffles about evolution and global warming on the “Hardball” show. (The evolution bit starts at 1:37 and continues sporadically to the end.) This took place in 2009. Pence is waffling a bit more and giving evolution a bit less of the stink-eye, but he simply refuses to sign on to the scientific facts. Sadly, Matthews keeps asking Pence if he “believes in evolution,” which puts evolution into the status of a belief system, like religion. Far better to ask if he “accepts the scientific fact of evolution.”

Pence finally says that we need to teach all the “facts” to the kids and let the kids themselves sort it out. Of course, some of the “facts” he’s referring to are misguided attacks on evolution.

Rarely does one see a reporter give a politician this hard a time on evolution and science in general. I don’t remember any reporter even asking Trump what he thought about evolution.

A new Park Service logo

January 27, 2017 • 11:30 am

Re the disaffected government employees (including scientists) who have apparently set up rogue Twitter accounts after Trump banned some agencies from tweeting, reader Hugh sent me this logo with a note:

A friend of mine from a US government resource management agency sent the attached alternative Park Service logo this morning.  I got a kick out of it and thought you may be able to use it in a post as the “Scientist Rebellion” builds steam.

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Here’s the official one:

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BioLogos author admits that God is silent, but you can hear Him (even in evolution) if you listen very, very hard

January 27, 2017 • 10:30 am

I haven’t been over to BioLogos for a while, but I see they’re still up to their old trick of trying to convince Evangelical Christians to accept evolution while remaining Evangelicals. That’s a fool’s errand, I think (see here, for instance), and my view is justified by the apparent lack of success of the BioLogos. Instead of shifting Evangelicals towards Darwins, BioLogos has itself become a source of Christian apologetics, engaging in the usual hair-splitting and in tortuous arguments about the existence of Adam and Eve.

I want to show the bizarre theology still on display there in an article about Martin Scorsese’s new film, “Silence” by BioLogos editor Jim Stump—an article called “Silence and evolution“.

Right before Christmas I mentioned “Silence” (based on a novel by Shusaku Endo); it’s about a Portuguese Jesuit priest who, ministering to his minority flock in Japan, sees them tortured horribly and killed for their faith—all while God remained silent. Why didn’t God do something? Apparently the movie and the book (neither of which I’ve essayed) still laud faith in God despite the fact that he didn’t do squat about those who worship him.

It’s not really clear why Stump is trying to mix evolution with the film, but he tries hard. His apparent thesis is that while the scientific view of evolution abjures God, and one can’t really see anything miraculous or supernatural about evolution, it’s still there if you just look hard enough—just like if you look hard enough at what happened in the movie, you can still find a way to eke a God out of a situation where he’s apparently absent.

Stump (my emphasis):

Too many people believe God’s only actions are miraculous actions. If there are normal, non-miraculous, or scientific explanations for something, then they think God had nothing to do with it. They want to see a burning bush, or they won’t believe God is speaking. They want to prove special, de novo creation or they don’t think God is creating.

I fear these attitudes, which are prevalent among the religious communities I’ve been part of, actually make it more difficult for us to see God at work in the normal circumstances of life, or more pertinently for the origins conversation, in the fossil record or in the genetic code. God has not left unambiguous evidence of his activity there, so we might see why science-minded skeptics interpret that as divine silence and content themselves with purely natural explanations. Nonetheless…I don’t think we’re being unreasonable when we look the scientific data squarely in the eyes and see something more at work. That something more is not in the gaps we don’t understand scientifically, but in the beauty and elegance of it all. There are difficult things we see too, and integrity demands we talk about them honestly. Still, it is reassuring to me how often through the eyes of faith we can see hints of the difficult things serving bigger purposes and even being transformed in the end.

Note the “not unreasonable” bit, which appears twice elsewhere in Stump’s piece (see below).  Well, I think it’s unreasonable to look at evolution and see “something more”, if that something more is any evidence for God. Certainly one can see evolution as beautiful and elegant, but that’s a human construal of a naturalistic process, just like you can see the formation of a snowflake as beautiful and elegant. Does that mean God is behind the formation of every snowflake?

Further, there’s a lot about evolution that’s not so pretty, including many painful forms of natural selection and the wholesale extinction of millions of species which died out without leaving any descendants. Is that so lovely? Why did God do that? And why, if we’re on the topic, did he “create” through such a tortuous and suffering-filled process instead of just poofing everything into being at once, as Genesis says? Don’t theologians have to answer that question?

Darwin, in fact, didn’t see any Abrahamic, beneficent God behind evolution; he saw the opposite. In a letter he wrote to his American colleague Asa Gray in 1860, Darwin said this about theology and evolution:

With respect to the theological view of the question; this is always painful to me.— I am bewildered.— I had no intention to write atheistically. But I own that I cannot see, as plainly as others do, & as I shd wish to do, evidence of design & beneficence on all sides of us. There seems to me too much misery in the world. I cannot persuade myself that a beneficent & omnipotent God would have designedly created the Ichneumonidæ with the express intention of their feeding within the living bodies of caterpillars, or that a cat should play with mice.

One can in fact “reasonably” ask this question: How much ugliness would it take in evolution (or the world itself) to give evidence against a god?

Stump goes on with his relentless confirmation bias, claiming that if you just try hard enough, you’ll find God. He’s just very quiet.  A few quotes:

Re the story of Elijah in the wilderness:

If God speaks in gentle whispers, is it any wonder we so often miss it? Our lives are filled with winds and earthquakes and fires.

And this one, which uses the “not unreasonable” trope (my emphasis):

I’ve often used this passage of Scripture to argue for the necessity of creating times of solitude and silence. In my own life, I’ve regularly gone to a monastery to get away from the hustle and bustle for a couple of days, let my mind slow down, and listen for the still, small voice. Sometimes I don’t hear anything but my own thoughts. Sometimes I think I do hear something else, but I’ll be the first to admit the evidence is slight and ambiguous enough that you wouldn’t be unreasonable in affirming either side of that debate.

Umm. . . if you’re adducing a supernatural being, and you don’t get much evidence, the reasonable thing to do is withhold judgment, not affirm a God. And if not everyone who tries gets that slight and ambiguous evidence, the best thing to do is reject the God hypothesis pending further and stronger evidence. 

Finally, we get “not unreasonable” again!:

I guess that’s one of the main things I take away from Silence. Faith is not so much a creed to assent to or a set of outward actions to perform—though I think those things have a place in the life of faith. Rather, faith is a way of looking at one’s life and choosing to see more than a series of random and meaningless events. It is possible—and I’d say, not unreasonable—to hear the gentle whisper as the voice of God, who numbers our days and orders our lives in subtle and loving ways. One of my favorite contemporary writers, Frederick Buechner, says it this way:

“In my own experience, the ways God appears in our lives are elusive and ambiguous always. There is always room for doubt in order, perhaps, that there will always be room to breathe. There is so much in life that hides God and denies the very possibility of God that there are times when it is hard not to deny God altogether. Yet it is possible to have faith nonetheless. Faith is that Nonetheless.”

In fact, both Stump and Buechner’s quotes are damning, as they clearly characterize faith as a desperate attempt to confirm something that you want to believe but have little evidence for. This is an explicitly antiscientific attitude, and is why BioLogos is constantly subverting its own mission.

h/t: Nicole Reggia

A reader’s comment on free speech: not for white supremacists!

January 27, 2017 • 9:00 am

It’s comments like the one below, which I simply threw into the bin, that make me want to keep defending free speech. As long as we have misguided folks like this one, who think that free speech is only for themselves and their friends, then someone needs to keep emphasizing what free speech is about.

This came from reader “Steve Brule,” commenting on “I’m an answerer on Askers“:

Hey i don’t know if you heard, but Richard Spencer got punched again and i was wondering when we can expect another post telling us we have to respect white supremacists and show them courtesy