Why Evolution is True is a blog written by Jerry Coyne, centered on evolution and biology but also dealing with diverse topics like politics, culture, and cats.
Today’s batch of photos comes from regular reader and photo-provider Mark Sturtevant, who notes, “This batch is unusual in that it includes a vertebrate.” Mark’s notes and IDs are indented (the links are also his), and you can enlarge his photos by clicking on them.
Here are more wildlife pictures that were taken a couple summers ago, all in the general vicinity of where I live in Michigan.
One of the locally unique kinds of insects that can be found in what I call the Magic Field is the oil blister beetle (Meloe sp.). I don’t think it a stretch to say that they have one of the strangest reproductive biologies in the animal kingdom, as summarized here. The individual shown below is a male, and I have just learned at this writing that their specialized antennae are used to clasp the female antennae during mating. The second picture was taken with my wide-angle macro lens.
Next up are a couple staged pictures of a brown lacewing, possibly Micromus posticus, which came to the porch light one evening. A trick well known in the hobby is that membranous wings can give a nice iridescent effect if you photograph them against a dark background.
Here is a thread-legged bug, Emesaya brevipennis, which also came to the porch light. These large-ish walking stick-like predatory Hemipterans have incredibly long rear legs, as can be seen in the linked picture. When sitting still, they eventually take on this pose where their mantis-like fore-legs are positioned as shown.
Next up is a staged photograph of a helmeted treehopper, Glossonotus acuminatus. I don’t see this species in my immediate area, but they are common a couple hours south of me.
The next picture is another treehopper, Entylia carinata, photographed in my backyard. It was being tended by what look to be false honeypot ants, Prenolepis imparis. These ants seek the sugary secretions from fallen fruits and also from plant feeding Hemipterans, and their abdomens can become quite engorged as a result. There were actually so many ants that it was hard to see the treehopper. But this picture was made as a composite of several pictures, pieced together with layer masks to remove most of the ants and to show more of the treehopper.
Next up is a monarch butterfly, Danaus plexippus, sleeping in a cherry tree at a local park. Taken very late in the season, this one was perhaps on its southward migration.
Lastly, I have a cherry tree in the yard, and here is an Eastern chipmunk (Tamias striatus),having a nibble from some of the old fruits as fall and winter began to set in. It was definitely suspicious of me.
I decided to have the AI art generator Dall-E 2 produce some different interpretations of that last picture, and here are some results. All I did was drop the picture in, and these came out. I don’t know how it seems to know what it’s looking at.
Today we have some insect and spider photos from Mark Sturtevant. His narrative and IDs are indented, and you can enlarge the photos by clicking on them.
Here are more pictures from a couple summers ago.
All summer, there will be webs of orb weaving spiders in my yard, and these will reliably be owned by a couple species in the genus Araneus. There was an especially large web in the garden, and so I set out to see if the lady was still around (they often aren’t). The inspection involves looking for a “sincere” looking curled leaf, either at 10 o’clock or 2 o’clock. This would be where they will hide. Sure enough, at one of those positions was a curled leaf with a tell-tale foot sitting on a special strand of silk that ran to the hub of the web. She was home.
But what did she look like? I coaxed her out, and here she is. Identifying these things can be tricky. I lean toward the marbled orb weaver (A. marmoratus), based especially on markings on the underside, but it could also be the cross orb weaver (A. diadematus), which was introduced from Europe. Anyway, she was fat with eggs. A postscript to this story is the following spring I found a large mass of tiny orb weaver spiderlings in the same area, and pictures are in the queue.
During the same time period, I found two new species of orb weavers in the yard. First was this neat little green one with beautiful lichen-like camouflage. This is the humpbacked orb weaver, Eustala anastera. Here I photographed her on a background of lichens.
And then there was this other new one that had this lovely woven basket retreat. Here is the retreat, and you can see the spider inside. I did not know that orb weavers could do that!
Here is the spider. It’s the lattice orb weaver, Araneus thaddeus. She really wanted to be back in her retreat, so of course that is where she went afterwards.
One day when out in a local park, this mating pair of bumblebees sort of plopped down on the boardwalk in front of me. They appear to be the common Eastern bumblebee, Bombus impatiens, which is by far the most common of our bumblebees here. Can you spot the stinger?
While we are going at it, here is a mating pair of locust borer beetles (Megacyllene robiniae) on goldenrod— their most common host flower. These two gave me quite a work-out, chasing them around the plant while I tried to get pictures of their stripey undersides. Locust borers are thought to be mimics of yellowjacket wasps.
One day while deep in the woods (slightly lost, but what else is new), I came across this lovely fly diligently feeding on bird poo. This is a member of a small and obscure family called flutterflies, after their long wings. The species is Toxonerva superba.
Returning to the yard, one evening there was this loudly singing insect in the back yard. It turned out to be this conehead katydid, Neoconocephalis sp. As a kid, I used to be rather afraid of these things since they can give a nasty bite and they do have a taste for meat. But here, a piece of lettuce was sufficient bribery for this one to settle down for pictures.
The last pictures are two of my favorites from the summer, as it does sort of capture how I look at times.
Thank Ceiling Cat, for readers have responded by sending in several batches of new wildlife photos. Today’s is from regular contributor Mark Sturtevant, who loves his arthropods. Here are photos of some, along with two mushroom photos (click all to enlarge); Mark’s notes are indented:
Here are more pictures of mostly local arthropods from two summers ago. The photographs were taken from area parks where I live in eastern Michigan. Many pictures are manual focus stacks to increase depth of focus.
The spiders shown in the first pictures are different species of sac spiders. These are small wandering spiders. The first is the long-legged sac spider (Cheiracanthium sp.), a common year-long resident in houses. They are a welcome sight on our walls during the long winters here, although I have learned in preparing this that their venom can cause necrotic effects in humans:
The second species is the broad-faced sac spider, Trachelas tranquillus. I don’t see these in houses, but they commonly turn up in bushes near the house. Their bite can also result in complications:
The spiders shown in the next pictures are in the nursery web spider family, so-named because females tend to their hatchlings in a web “nursery” on top of plants. The first is pretty much our largest spider, Dolomedes tenebrosus. You can have a gander at the linked picture to learn that these are indeed spiders of impressive size:
The second species is a smaller kind of nursery web spider called Pisaurina mira. It took a lot of experimentation with camera settings to combine flash and ambient light to preserve the glow of sunlight through the leaf:
The next picture shows a handsome male Pike slender jumping spiderMarpissa pikei. I can sometimes get them by using a sweep net in tall grasses. These elongate jumping spiders are a delight to work with because unlike most jumping spiders they are willing to sit still for me so long as they can align themselves on a blade of grass:
The grasshopper nymph shown next was also picked up in a sweep net. This is the northern green-striped grasshopper (Chortophaga viridifasciata) that I posed on my straw hat for pictures:
This is a predatory robber fly. I can’t get the ID on this small one, and that will be the case for some of the other pictures below (sorry!):
Next is a rather strange caterpillar that I also have not been able to identify. It looks like an inchworm, but actually caterpillars from different families also have this look.
The cryptically shaped moth shown next is definitely known to me. This is a common looper moth, Autographaprecationis, that turned up at a porch light one evening:
The last pictures are of mushrooms (species unknown), and they were taken with the inexpensive Opteka wide-angle macro lens. I always carry that lens around when I’m out with the cameras in case scenes like these turn up. The pictures are assembled from two or more pictures taken at different flash powers and shutter speeds to either expose for the foreground or the background. The different pictures were then blended together thru layer masks. A thing that is rather strange about wide angle macro lenses is that although it does not look like it, the subjects are less than an inch away from the lens:
Again I appeal to readers to send in their good wildlife photos. Let’s keep this feature going!
Today’s post features photos by stalwart regular Mark Sturtevant. Mark’s captions and IDs are indented, and you can enlarge the photos by clicking on them.
Here are insect pictures from two summers ago.
I had recently shown the European earwig, Forficula auricularia, and here we go again. The rear pincers are modified cerci appendages that many insects have. Cerci are commonly used as sensory appendages, but earwigs have adapted them for a number of uses that include defense, handling prey (they are omnivores), and males use them for jousting. Toward that end, earwig cerci are dimorphic between the sexes. The first picture is a female, and the next are males. Besides being larger, male cerci come in different sizes and sometimes they are asymmetric. You can see males fighting with their cerci in this video. It also explains why some cerci are a bit lopsided.
There seems to be some debate about name “earwig”. There is the myth that they may crawl into peoples’ ears, but another claim is that the name has to do with their remarkable hind wings that are ear-shaped when unfolded. The unfurling of their wings is pretty impressive, and you can see that in slow motion below:
Next is a picture of a spined assassin bug, Sinea diadema. This is a predatory insect.
I was in the woods one day when I came across this unidentified leaf beetle (Chrysomelidae) in a bush. I was negotiating how to photograph the beetle, but a stink bug nymph suddenly appeared from behind and impaled it! Some stink bugs are predators, and I have seen them with dispatched prey that are much larger and more powerful than they are. One can fairly wonder how such slow insects might be predatory, but I guess it just takes a poke from their proboscis and their victim is secured. The stink bug is Podisus sp.
The beetle dragged the bug behind for several minutes, but the bug grimly hung on. Meanwhile, a bundle of needle-like styli would be scissoring their way into the beetles’ innards, and digestive juices would be injected.
Gradually, the beetle began to slow, and then it was immobilized. A small murder in the woods!
Next up is a two-striped planthopper, Acanalonia bivittata. “Planthoppers” encompass a number of insect families, this one being Fulgoridae. There are also “leafhoppers” and “treehoppers”. One day I should try to memorize what the differences are supposed to be. All of these and other related families were once in their own insect order, the Homoptera (“uniform wing). But now they are awkwardly but I expect correctly absorbed into the order Hemiptera (“half wing”), along with the above stink bug.
Here is a nymph of what is likely the two-spotted tree cricket, Neoxabea bipunctata. This is a young male, and you can see it is developing the specialized front wings that are used by males for chirping, and the larger fan-like hind wings which they fly with. In adults, the hind wings are of course folded up and covered by the front wings. But at this earlier stage the position of the wings are curiously reversed so that the hind wings cover the front wings.
I had found this tiger beetle that was disabled, and so I could pick it up. Tiger beetles are predators that use their good vision and considerable speed to tackle small prey. There is dispute about the taxonomy of this group. They had long been placed in their own beetle family (Cicindelidae), but others have placed them within the ground beetle family (Carabidae). I can say only that there are many ground beetles that resemble tiger beetles, and tiger beetles that look like ground beetles, and whatever side you are on there is agreement they are closely related. Tiger beetle mandibles look pretty imposing, but the bite strength of this small one isn’t detectable. I did not think to get the species.
Next is a large ichneumon wasp, Megarhyssa macrurus, which had apparently recently emerged as an adult and was not quite ready to fly. The extraordinary ovipositor hanging off the rear is considerably longer than its body, and is used to drill into wood to lay an egg in a wood-boring sawfly larva.
Finally, I expect that most people know that scorpions fluoresce under UV light. Actually, UV fluorescence appears here and there among arthropods in general, and plants will also fluoresce under UV. It’s fun to go out at night with an inexpensive LED UV flashlight to see what turns up. Your own back yard becomes fairly transformed into a semi-alien world. Leaves, flowers, and sometimes arthropods will blaze in day-glo colors.
I had found that aphids also fluorescence under UV light. Here are poplar tree aphids (Chaitophorus populicola), first in regular light, and then under UV light. There are two issues here, though. There is some motion blur from the aphids because the exposure needed to be long. And although the aphid fluorescent color seems pretty accurate, the leaf color is wrong since it is supposed to be deep red under UV. My current flashlight is cheap, and it certainly does not put out only UV light.
Today’s photos are a batch of microorganisms and small creatures sent in by reader Mary Rasmussen. Her captions and narrative are indented, and you can enlarge the photos by clicking on them.
If there’s water, there’s probably something living in it.
I collected a half gallon of water, muck, detritus, rocks, a tiny aquatic plant and 3 snails from some very shallow temporary pools along the Lake Michigan shore. Lake Michigan’s depth varies year-to-year. The pools sometimes last a few years and sometimes just a few weeks. This year the lake level was down and the pools dried up by the end of summer.
I put the water etc. in a 12 inch square glass aquarium with an L.E.D. light on top. These are the creatures living in the water that I was able to photograph.
The last 2 photos are Seed Shrimp that were living in 2 inches of water that had collected in a truck rut in a gravel road.
Aquatic Sowbugs (order: Isopoda) a freshwater crustacean, lived at the bottom of the tank, feeding on organic matter.
Two Hydra (phylum Cnidaria, class Hydrozoa, genus Hydra) After a month there were many of these predators in the tank. I could watch them for hours.
Hydra don’t show any signs of deteriorating with age, and there is speculation that they may be immortal. (I’m sorry but I can’t identify that creature on the left.)
Hydra with bud. The bud is a clone of the parent and will break free when mature.
A freshwater snail laid a trail of eggs on the aquarium wall. These are close to hatching.
Seed Shrimps (subphylum Crustacea, class Ostracoda) have a hard shell and use their antennae to move through the water. These were barely visible in the water of a truck rut.
I used a Nikon D500 camera with three off-camera flashes. For larger creatures (Sowbug, Hydra) I used a Nikkor 105mm macro lens with extension tubes. For smaller creatures (snail eggs, Cyclops, See Shrimp) I used a Laowa 25mm f/2.8 2.5-5X Ultra Macro lens with extension tubes.
Today’s reader introduces himself and his pictures below. Semyon’s words are indented, and you can click the photos to enlarge them. I believe this is the first Russian contributor we’ve had. Welcome!
My name is Semyon Morozov. I’m sending you my wildlife photos.
These photos were taken in August 2016 in my small homeland, Kurgan Oblast (Russia, the south of the West Siberian Plain). Photo hunting was successful at that time!
Here’s a female wasp spider (Argiope bruennichi). Look at these white things on her web: they are called stabilimenta. Their function is not completely clear. Scientists assumed that these structures stabilized the web, but then other explanations appeared, such as protection from predators or attracting prey.
Eurydema ventralis is a shield bug that feeds on crucifers and some other plants. The bug sits on a leaf of Parthenocissus that has been cut by a leafcutter bee (Megachile sp.).
The yellow-winged darter (Sympetrum flaveolum) is one of the most common dragonflies in this area.
This is an odd caterpillar of the grey dagger (Acronicta psi). It was ready to pupate, so I took it home for observation.
But instead, a fat larva of some parasitoid wasp crawled out of the caterpillar! Then the larva pupated, and after 16 days an imago appeared from the pupa.
And here’s the Roesel’s bush-cricket (Roeseliana roeselii). This individual has a saber-like ovipositor at the end of the abdomen, which indicates that it’s a female.
All these arthropods were dwellers of the garden. Now let’s go beyond it. What are these cupcake-like things on the rotten stump? These are the fruiting bodies (aethalia) of the slime mold (Fuligo septica, I guess). These are not fungi but organisms, the life cycle of which includes both a single-celled amoeba-like stage and a macroscopic one.
In the meadow, I found a wasp spider again. This female caught another predator, a dragonfly (it’s most likely the yellow-winged darter).
There was a pond nearby, next to which I met a caterpillar of the drinker moth (Euthrix potatoria). It’s said that the insect was so named because of the caterpillars’ passion for dew.
I found another caterpillar on the pond shore. It was a larva of the reed dagger (Symira albovenosa = Acronicta albovenosa), a moth that likes reed beds.
And finally, here are exuviae of some dragonfly. These are the remains of an exoskeleton that a larva left after molting.
It looks as if I’ll be in Chicago over Coynezaa, so do send in your photos, and we’ll see if we can keep this feature going over the holidays.
Today’s batch of photos come from Mark Sturtevant, whose IDs and captions are indented. Click the photos to enlarge them.
First up is a bundle of assassin bug eggs. A very common species of this predatory insect is Zelus luridus, and so that is most likely what will hatch from these eggs:
The European earwig (Forficula auricularia) is commonly seen up on plants, and they can accumulate in considerable numbers. Because they nibble on flowers and leaves, gardenersgenerally view them as pests. However, they also eat small arthropods, including aphids. I like them because they are so weird looking, and their matte finish photographs so nicely. The pinchers on the rear are modified cerci (those being appendages that many insects have). When alarmed, they will curl their abdomen like a scorpion, and they do look pretty fierce that way but it’s all a bluff since they cannot pinch in the slightest. But there are claims that other earwig species can use them as weapons of a sort:
In my younger years, the pink spotted ladybeetle (Coleomegilla maculata) was a common sight, but they are pretty rare where I live now. It was therefore exciting to at last find a pink ladybeetle when I was out “bugging” with the camera, but for some reason this one wasn’t moving. One can see why in the picture. Do you see the small cocoon underneath the beetle? That is the cocoon of a parasitic Braconid wasp! So this beetle was unfortunately parasitized, and its body was being used as a kind of protective shield:
Wolf spiders are most active at night, and then they can be easily found by using a flashlight to spot them through their brilliant eye-shine. So I went out to a remote park one evening to look for wolf spiders. The experience was rather startling, since a walk through the woods at night (which was a bit creepy, to be honest) revealed a veritable milky way of tiny glowing green eyes lighting up the trail. The wolf spiders on the trail were all small, but I had no idea they would be so numerous! After about a mile, the woods opened up to a large field and a full moon. More tiny glowing eyes, but not so many. Then I came across a set of eyes that were much bigger, and behind those was a very big wolf spider! A strikingly colored female. After admiring her, she was respectfully scooted into a bug cage. A bit more searching turned up a male of what was clearly the same species. Fortunately, I had two bug cages, and so in he went. Then it was time to go home with the prizes.
When I could get out again, I returned to the field in the day time with the spiders so that they could be properly photographed and then released. The species is Hogna baltimoriana. The female easily had a leg span of about 3 inches, while the skinny male was much smaller:
Bringing up the rear are male and female jumping spiders (Phidippus clarus) that are in an endearing and committed relationship. The male is in plain view, while the female is seen as a vague outline in her silken retreat. According to BugGuide, females of this species are frequently seen hanging out at the top of plants like this. The male, having found her, is now guarding his “intended” against any rival males. Although disturbed by my presence, he would not leave her side:
