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Mozambique Diary: Sibylla

A portrait of the Precious Sibyl mantis (Sibylla pretiosa) – it is easy to get the impression that this insect really thinks.

A portrait of the Precious Sibyl mantis (Sibylla pretiosa) – it is easy to get the impression that this insect really thinks.

These days, if God speaks directly to you, be it about the precise date for the end of the world or his opinion about somebody else’s sexual preferences, you are either a crazy nut or a Westboro Baptist crazier nut. Ancient Greeks, clearly more open minded about such things, referred to a woman with powers to prophesy God’s actions with a much nicer-sounding honorific – Sibyl. Perhaps the 19th century Swedish entomologist C. Stål saw some of that craziness in the facial features of a gracile praying mantis from southern Africa, and christened it Sibylla pretiosa – the Precious Sibyl. Looking at this remarkably anthropomorphic insect it is indeed easy to get the impression that some strange thoughts are percolating in its brain.

The Precious Sibyl mantids (Sibylla pretiosa) are usually found high on the branches of savanna trees.

The Precious Sibyl mantids (Sibylla pretiosa) are usually found high on the branches of savanna trees.

I first encountered Sibylla many years ago in Zimbabwe, amazed at the sight of large mantids, nearly ghost-like in their slender built and pale coloration, that were zipping up and down smooth tree trunks. Last year I once again found Sibylla while collecting insects high in the canopy of a large Combretum tree in Gorongosa National Park. Alas, it was a tiny nymph. This month, however, while in Gorongosa during the peak of the rainy season, Sibyllas were plentiful on tree trunks and at the lights of the Chitengo Camp.

A male Sibylla cleaning his antennae.

A male Sibylla cleaning his antennae.

Despite their fragile appearance, these insects are skilled hunters, capable of catching and devouring prey at least half as long and nearly as heavy as themselves. They slowly stalk crickets and moths found on the bark, constantly vibrating their antennae in a fashion similar to that in many parasitoid wasps, which may indicate the use of chemical signals in detection of their prey. I have also seen these mantids feeding at night, which further supports the possibility of using non-visual cues while hunting.

Young Sibylla are very spindly looking and are found usually on leaves and tips of thin branches.

Young Sibylla are very spindly looking and are found usually on leaves and tips of thin branches.

Although superficially similar to empusid mantids, Sibylla is more closely related to another amazing dead leaf mimic, the Ghost mantis (Phyllocrania paradoxa), which I yet need to find in Gorongosa (but I was told by a resident that he had seen one). Most of the 14 known species of the genus Sibylla are found in West and Central Africa, and the individuals from Gorongosa are the first records of this genus of insects in Mozambique.

Sibylla mantids are closely related to the otherworldly Ghost mantids (Phyllocrania paradoxa). I have not yet found one in Gorongosa, but I am pretty sure that we have them there.

Sibylla mantids are closely related to the otherworldly Ghost mantids (Phyllocrania paradoxa). I have not yet found one in Gorongosa, but I am pretty sure that we have them there.

Alas, having caught quite a few individuals of Sibylla attracted to my mercury vapor lamp in Gorongosa, I am now convinced that this pretty insect does not have the powers to foretell the future. Otherwise they would have known that if you come to my light, you never leave.

Sibylla are voracious predators of insects found on tree bark and branches.

Sibylla mantids are voracious predators of insects found on tree bark and branches.

Mozambique Diary: The Cat mantis

I decided to christen this impressive praying mantis (Heterochaeta orientalis) the Cat mantis, on the account of its head morphology, but even its defensive behavior reminds me of a cranky cat (is there any other kind?).

I decided to christen this impressive praying mantis (Heterochaeta orientalis) the Cat mantis, on the account of its head morphology, but even its defensive behavior reminds me of a cranky cat. (Is there any other kind?)

Arriving in Gorongosa National Park in Mozambique at this time of the year, when the grasslands are bone dry and green has all but disappeared from the color palette of this immense ecosystem, I did not expect to see too many insects. Sure, there will always be ants and a bunch of grasshoppers, but the bulk of the insect fauna pretty much disappears until the onset of rains in November. The nights are quite cold when the atmosphere is devoid of the buffering layer of humidity and consequently few insects are active around the lights of the camp. But those that do come are often stunning. Some of the first animals that I spotted when I resumed my nightly patrols around the lights of the Chitengo camp were huge praying mantids Heterochaeta orientalis, whose head morphology immediately brought to my mind a scrawny, long-eared house cat, and that’s what I decided to call them. The Cat mantids are probably some of the largest in Africa, with the females’ body length approaching 20 cm. Males are about 15 cm long, which still makes for an imposing insect.

Despite his huge size, a Cat mantis (Heterochaeta orientalis) is virtually impossible to spot in its natural setting of bare branches in the woodland savanna of Gorongosa.

Despite his huge size, a Cat mantis is virtually impossible to spot in its natural setting of bare branches in the dry woodland savanna of Gorongosa.

Little is known about this species’ biology. I have always found Heterochaeta on tall shrubs and bushes in the woodland savanna, albeit finding them is definitely not easy – despite their size they are some of the most cryptic insects of Gorongosa. It is enough to take your eyes off an individual sitting on a branch for a few seconds to completely lose sense of its whereabouts. When resting on a branch these insects hold their long raptorial legs outstretched to the sides in an uncanny resemblance of two dead twigs coming off a larger branch, very unlike the typical “praying” stance of other mantids, who tend to hold their raptorial legs neatly folded under the pronotum. The pointy protuberances on the Cat mantis’ eyes enhance the illusion that this animal is just a dead, spiky stick. Clearly, their main defense mechanism is to remain undetected by either predator or prey.

While resting on a branch the Cat mantis keeps its forelegs outstretched to the side, enhancing the illusion of being just another dead stick.

While resting on a branch the Cat mantis keeps its forelegs outstretched to the side, enhancing the illusion of being just another dead stick.

But in addition to its superb crypsis the Cat mantis has another trick up its sleeve when it comes to avoiding being eaten. When I first tried to pick up one of the individuals that came to the light, it immediately responded by rearing up its body, opening the front legs to reveal a bright patch on the underside, and fanning its wings to flash a beautiful, contrastingly yellow and black pattern. This color combination signifies danger (think wasps and their stingers) and many potential predators may pause before attacking the Cat mantis, giving it time to fly away. The mantis is bluffing, of course, as other than a very weak pinch it can deliver with its long forelegs it does not have any real weapons or chemical defenses.

When cornered the Cat mantis rears up to make itself look bigger and flashes beautifully yellow and black hind wings that normally lie hidden under the cryptically colored front wings.

When cornered the Cat mantis rears up to make itself look bigger and flashes beautifully yellow and black hind wings that normally lie hidden under the cryptically colored front wings.

Ever since I first came to Mozambique I have been marveling at the praying mantis fauna of Gorongosa, which is the richest that I have seen anywhere in the world. My species list is approaching 50, but the actual number is almost certainly greater. Their abundance is also exceptionally high, and it is not rare for me to get 5-10 individuals of praying mantids in a single sweep of an insect net across the tall grassland. What drives this richness is something that I am interested in understanding, but it may be related to an equally high abundance of orthopteroid insects, the main prey item of many mantids.

A male Cat mantis at sunset.

A male Cat mantis at sunset.

Empusids

A portrait of a male empusid Idolomorpha dentifrons from Gorongosa National Park, Mozambique. This photo is a composite of four vertical frames.

A portrait of a male empusid Idolomorpha dentifrons from Gorongosa National Park, Mozambique. This photo is a composite of four vertical frames.

In about a week I should be back in Mozambique and this blog will likely get more interesting. We have an exciting project developing in Gorongosa National Park, one that is bound to generate a lot of good data and influence biodiversity science in the country for years to come. More about it soon. But in the meantime I thought I would put a spotlight on a relatively little known group of organisms that one can easily see in Mozambique – the empusid praying mantids.

The family Empusidae is a small lineage of mantids, with only 28 described species found mostly in drier regions of Africa and a handful of additional species in southern Europe and SE Asia. It is one of the very few families of mantids known to be monophyletic, and it shows – they all share remarkable morphology that makes them stand out among other members of this singular order of insects. Two main body types are common – they are either thin and stick-like or, while still being rather spindly, the body is covered with large lobes and flaps, making them excellent mimics of dried, shriveled leaves.

The stick-like variety, such as the genera Empusa, Hemiempusa, and Idolomorpha, are usually found in grassy vegetation, where they hunt small insects, such as planthoppers and grasshopper nymphs. Earlier this year I ran across a gorgeous male specimen of Idolomorpha dentifrons on the Cheringoma Plateau of Gorongosa, but had troubles photographing it in a way that would properly convey its incredibly elongate morphology. In the end I took a series of vertical photos of its head and front legs that I stitched together in PS, and here is the result. Male empusids are unusual in having pectinate antennae, the kind usually seen in silk moths and other insects with well-developed pheromonal communication, where the female emits sex pheromones and males follow the faint scent trail. Not surprisingly, such behavior was recently demonstrated to be present in empusids (Gemeno et al. 2005. J. Ins. Behav. 18: 389-403).

The leaf-like morphology can be seen in the Devil’s mantis (Idolomantis diabolica), arguably one of the most striking and beautiful praying mantids in the world. The body of immature individuals resembles a dry, withered leaf, except for the brighter colors on the underside of the raptorial front legs. Adults turn pale green and white, and the pattern on their front legs becomes brightly red, resembling vivid petals of a flower. There is a reason for this – Devil’s mantids are specialized hunters of pollinators, such as bees and butterflies, and presumably this bright coloration fools some insects into coming dangerously too close.

Devil’s mantids are known to occur in woodland savannas of Kenya and Tanzania, but on my recent visit to the National Natural History Museum in Maputo I discovered in its entomological collection a few ancient specimens from various parts of Mozambique. One had been collected in the 1960’s tantalizingly close to Gorongosa. Knowing that there is a chance of being able to see this gorgeous creature in its natural habitat, I am now obsessed with trying to find it. I didn’t succeed on my recent visit to Mozambique, but maybe I’ll have better luck this time. Watch this space.

Nymphs of the Devil's mantis (Idolomantis diabolica) resemble dry, shriveled leaves, which allows them to blend among the vegetation, where they hunt fast flying insects. Interestingly, this species is not interested in slower insects and those that walk or crawl on the vegetation – the prey must be flying really fast to elicit this predator's response. (This photo shows a captive individual.)

Nymphs of the Devil’s mantis (Idolomantis diabolica) resemble dry, shriveled leaves, which allows them to blend among the vegetation where they hunt flying insects. Interestingly, this species is not interested in slower insects and those that walk or crawl on the vegetation – the prey must be flying really fast to elicit this predator’s response. (This species has recently become popular in the pet trade, and this photo shows a captive individual.)

The Cape empusid mantis (Hemiempusa capensis) devouring a grasshopper.

The Cape empusid mantis (Hemiempusa capensis) from South Africa devouring a grasshopper.

Male empusid (I. dentifrons) cleaning his pectinate antennae.

Male empusid (I. dentifrons) cleaning his pectinate antennae.

Mozambique Diary: A reversal of fortune

Miomantis is a large genus of small praying mantids, with about 75 species known from across Africa. Females, like this individual, are usually short winged, while males are fully winged and are excellent fliers.

Miomantis is a large genus of small, delicately built praying mantids, with about 75 species known from across Africa. Females, like this individual, are usually short winged, while males are fully winged and are excellent fliers.

Gorongosa National Park is heaven for praying mantids – nowhere else in the world have I seen so many different species or similarly high abundance of these insects. This appears to be a good indicator of the overall condition of this ecosystem, with almost unlimited availability of prey. Usually this means grasshoppers and other insects, but occasionally arachnids and even small lizards fall prey to some of the mantids.

Last night I was walking along a path in the camp and noticed a small praying mantis of the genus Miomantis getting ready to catch a fat green spider that was beginning to spin a web by one of the lights that illuminated the pathway. These mantids are no longer than a half of your pinky finger and delicate in their built, and usually feed only on small flying insects. But this female was clearly very hungry. She struck the spider and caught it in her raptorial front legs. “Good for you”, I thought, “this will be enough food to produce several clutches of eggs.”

This poor mantis clearly overestimated her hunting abilities – the spider she had caught not only managed to escape her grip, but also killed and eventually ate her.

This poor mantis clearly overestimated her hunting abilities – the spider she had caught not only managed to escape her grip, but also killed and eventually ate most of her.

I decided to take a photo of this feat and ran to get my camera. But when I came back I saw that the situation had turned tragic for the huntress – the spider had managed to free itself from her clutches, bit her, and was quickly spinning strands of silk around her. The spider was slightly injured, too, as evidenced by droplets of hemolymph oozing from several points on its body but, in the end, it won fair and square.

Slipping out of the skeleton

A time-lapse video of a male Chinese mantis (Tenodera parasinensis) undergoing his final molt. I recorded it last night over the period of 5:35 hours; this movie contains 494 individual frames taken with Canon 6D.

Note: If the quality of the video clip embedded below is poor, click here to see the uncompressed video.

Mom would have been so proud

A couple of months ago tiny Chinese mantids overran my house, having hatched unexpectedly from an ootheca that was supposed to stay dormant until spring. Last night the first female of the batch successfully molted into adulthood (the first male had his imaginal molt three days earlier), thus completing the cycle that started when I adopted “Florimonde”, an old Chinese mantis that had flown into a friend’s house in Cambridge last fall.
Insect molts are one of the most amazing spectacles of the natural world and I don’t think I will ever tire of watching these incredible transformations. And although I didn’t get much sleep last night (she did not begin her molt until 6 AM), it was definitely worth it.

The complete developmental cycle of Chinese mantis (Tenodera parasinensis) - it began on December 4th, 2012 and ended with the final molt on February 17th, 2013.

The complete developmental cycle of Chinese mantis (Tenodera parasinensis) – it began on December 4th, 2012 and ended with the final molt on February 17th, 2013.

A female Chinese mantis expanding her wings after the final (imaginal) molt.

A female Chinese mantis expanding her wings after the final (imaginal) molt.

African Tuesday: Being bark

How many insects can you see? I was thrilled to discover that lantern bugs (Druentia variegata) in Gorongosa are visited by several species of insects seeking their sweet honeydew.

How many insects can you see? I was thrilled to discover that lantern bugs (Druentia variegata) in Gorongosa are visited by several species of insects seeking their sweet honeydew.

When I first read “Out of Africa”, which to this day remains one of my favorite books, the one thing that left me oddly dissatisfied was the lack of attention to trees of the savanna – their smell and colors, the texture of their bark and, most importantly, all the wonderful creatures that the author must have seen among the leaves and branches. How could Isak Dinesen devote so much attention to lions and illicit romance, and not mention amorphoscelid mantids? Sheesh, what was his problem? But perhaps I was asking too much – after all, not everybody spent their childhood picking coreid bugs and geometrid moths off tree trunks, but I wasn’t happy until I could run my hand along the smooth stem of a southern African Acacia, and gasp at the sudden discovery of a gecko hiding in plain sight.

Tree bark may not appear to be a particularly exciting habitat to live in. It is essentially two dimensional, devoid of bright colors, flat. Of course it seems so only from our gargantuan, human perspective. In fact bark is a rich, diverse ecosystem, replete with deep rifts and valleys, covered by amazing vegetation, and as dangerous to live in as the heart of the savanna.

The last time I visited Africa was a few months ago, on the floodplains of Mozambique’s spectacular Gorongosa National Park. It was the beginning of the dry season, and grass was already turning yellow and stiff. With every scorching day fewer and fewer insects were active in the grasslands, and so I turned my attention to the mottled surfaces of tree trunks, hoping to find some hidden treasures. And I wasn’t disappointed.

Bark katydid (Cymatomera denticollis) looks just like a flake of bark.

Bark katydid (Cymatomera denticollis) looks just like a flake of bark.

My first discovery was somewhat accidental – it turned out to be one of nature’s most wonderful callers, a maker of melodious, bird-like trills, and I ran into him thanks to my own nature’s call. With a bottle of beer in hand, I was making my way towards a latrine (I was at a small social shindig at one of the field camps), when my other hand met something soft, velvety, and clearly alive on a stem of a small tree. What in any other person would have elicited an immediate withdrawal response, the many years of pursuit of all things small and agile caused my hand to instinctively grasp the animal tighter. Holding onto the tree and still not knowing what was under my hand, I set down the beer bottle and gently pulled the animal off the bark. When I realized what I was holding I nearly failed to deliver the reason of my night walk to its intended destination (i.e., I almost peed my pants) – it was a bark katydid (Cymatomera denticollis), an elusive creature that I only had seen once a decade earlier, and had been trying to find again ever since.

When threatened, bark katydids fan their wings to reveal aposematic coloration and spray the attacker with foul-smelling chemical.

When threatened, bark katydids fan their wings to reveal aposematic coloration and spray the attacker with foul-smelling chemical.

A bark katydid is nothing like your typical, green, leaf-like variety. Its body is flat, covered with fine fuzz that makes them feel warm and soft, and the legs have small lobes that make the animal blend perfectly amongst lichen-covered flakes of African bark. But crypsis is not its only defense – if feeling threatened, the katydid fans its wings, revealing a brightly yellow and black abdomen, and sends a cloud of noxious, foul-smelling chemicals. And this is exactly what happened when I opened my hand to see what was in it, and I nearly dropped the precious animal.

Trees of the southern African savanna are home to wingless grasshoppers of the family Lentulidae. They display many characteristics typical of juvenile stages, and entomologists speculate that this group may be an example of neoteny. (Mecostibus mopanei, Gorongosa).

Trees of the southern African savanna are home to wingless grasshoppers of the family Lentulidae. They display many characteristics typical of juvenile stages, and entomologists speculate that this group may be an example of neoteny. (Mecostibus mopanei, Gorongosa).

Over the next couple of months I spent many hours scanning the surface of tree bark in Gorongosa. This simple activity allowed me to discover and collect not only a wide range of fascinating creatures, but also make several interesting discoveries about their behavior. Among others, I found that African lantern bugs (Fulgoridae) might be a part of a complex trophic interaction, similar to what I had studied in Costa Rica, and I will be looking into this system later this year. Most people come to Gorongosa for the landscapes of the Rift Valley and lions. I am going back for the cracks in the bark and tree mantids.

A young praying mantis (Theopompa sp.) is nearly invisible on a lichen-covered bar, and as dangerous to animals living on trees as a lion is to grazers of the Gorongosa plains.

A young praying mantis (Theopompa sp.) is nearly invisible on a lichen-covered bark, and as dangerous to animals living on trees as a lion is to grazers of the Gorongosa plains.

The bark of baobabs (Adansonia digitata), a common tree of Gorongosa,  is a great place to look for cryptic animals.

The bark of baobabs (Adansonia digitata), a common tree of Gorongosa, is a great place to look for cryptic animals.