…wishes you a Merry Christmas and a Happy New Year! May your holidays be filled with family, friends, and fun.
Copyright © Ted C. MacRae 2011
A Riot of Colors
Turkey tails (Trametes versicolor) on lichen-encrusted trunk of fallen post oak (Quercus stellata)—ventral view.
For my friend Rich and I, Thanksgiving week marks the official beginning of the winter hiking season. Fifteen years ago we began our quest to hike the entirety of the Ozark Trail, and with only ~50 of the 350 miles constructed to this point in Missouri to go we find ourselves tantalizingly close to reaching that goal. This year we started the season with 10+ miles of the northernmost Courtois Section. The rains of the previous few days had stopped, but the moisture-laden air still hung heavy under gray, overcast skies. Such a day may not be considered optimal for photography, but nothing could be further from the truth. Lichens and fungi, normally muted and inconspicuous, spring to life when awash with moisture and splash the woodlands with a riot of colors rarely seen on dry, sunny days. The dark, almost black, color of the wet bark adds to the contrast and further emphasizes the ubiquity of these “lower forms of life” amongst the now leafless trees.
Among the most distinctive of these is turkey tail (Trametes versicolor), an extraordinarily common polypore fungus that grows on the trunks of declining and dead deciduous trees—especially oaks. Like all polypore fungi, turkey tail feeds saprophytically within dead and dying wood but is more familiar to us by way of its externally produced reproductive structures, or “tails,” for the release of spores. As the specific epithet suggests, turkey tail comes in a variety of colors ranging from gray through browns to black, and the association of older tails with algal growth even adds greens to the mix. The diversity of colors is found not only within a single locality, but even on a single tree! The especially colorful example shown in these photos, made even more so by its intermixture with green crustose lichens, was found on the trunk of a post oak (Quercus stellata) tree that had fallen across the trail, and I couldn’t help but marvel at the range of colors present and the contrast between the dorsal and ventral surfaces.
Update 30 Dec 2011: Kathie Hodge has provided the following correction to my identification:
Hate to tell you, but the turkey tails in your post aren’t turkey tails, alas, they’re Trichaptum biforme. It’s one of a bunch of shelf fungi that resemble true turkey tails. You can tell them apart by the small, regular pores of Trametes, whereas Trichaptum has a rugged toothy thing going on. Also, T. biforme is paler on top, not as strongly zonate, and has a distinctly purple growing edge (and sometimes the hymenium is delightfully purple too).
Thank you, Kathie, for keeping me on the straight and narrow (and maybe I should stick with beetles in these quizzes!).
Natural light (ISO1600, f/5.6, 1/60 sec)
Full flash (ISO160, f/16, 1/200 sec)
Of course, color is a matter of perception, and I wondered what effect lighting would have on this. When it comes to macrophotography I’m an unapologetic flash-man, preferring the flexibility and sharpness of detail that flash lighting offers over the dreamier “natural” images produced with strictly ambient light. The above comparison, looking at the dorsal surface of the tails with their characteristic concentric zones of colors, did nothing to change that opinion. While some might insist that the natural light photo is a truer representation of the actual colors witnessed, to me it looks gray and faded—no doubt a result of illumination by a large gray light source (the cloudy sky). While my eyes might have seen muted shades of gray and brown, my mind saw vivid shades of rust, orange, and green—colors captured more faithfully by the full-flash illuminated photo.
The strikingly zonate upper surfaces present contrasts in texture as well as color
Congratulations to those of you who guessed some kind of polypore fungus in Super Crop Challenge #10, although nobody correctly deduced an ID below the family level. I fear my challenges have gotten too difficult, as this is the second one straight in which nobody arrived at the correct answer. Nevertheless, on points Mr. Phidippus takes top honors with 11, while Roy, Tim and John earned enough points to receive podium mentions. Session 5 overall leader, Marlin, didn’t play this time, so Mr. Phidippus now takes over the top spot—can he hold onto it as the session plays out?
Copyright © Ted C. MacRae 2011
Super Crop Challenge #10
It’s gotten a little quiet around here lately, and since we haven’t done a Super Crop Challenge for awhile let’s see if this latest version will liven things back up. This challenge strays a bit from my normal scope, so I’m not sure how difficult or easy it will prove to be. I’ll award 2 pts for all correctly stated primary rank taxa (what a mouthful!)—standard challenge rules apply, including moderated comments to give everyone a chance to submit their answers. Bonus points will be awarded to early birds if multiple participants arrive at the same correct answer, and possibly also for other relevant comments (at my discretion). Good luck!
Copyright © Ted C. MacRae 2011
Sometimes the best collecting…
Anambodera sp. (prob. undescribed) | Nothing, Arizona
As a practicing (albeit non-professional) taxonomist, I spend a goodly amount of time examining specimens collected not only by me, but by others as well. I’ve mentioned before the benefits of doing this—both to the collector, who gets names for the specimens in their collection, and to my own research in being able to cast a broader net in my search for new distributions and host associations within my two primary focus groups—Buprestidae and Cerambycidae. Such information remains surprisingly incomplete for these two popularly collected groups of beetles, and every few years I assemble whatever records that I’ve accumulated to that point for publication in the form of a “notes” paper (e.g., Nelson and MacRae 1990, Nelson et al. 1996, MacRae and Nelson 2003, MacRae 2006, MacRae and Rice 2007). Occasionally I encounter species that I have not yet collected myself (although with ~70% of Nearctic species now represented in my collection, this is becoming more and more infrequent), and in most such cases the collector graciously allows me to keep an example or two (leading to the saying, “Sometimes the best collecting is in other people’s collections!” ☺). The ultimate find, however, is a specimen or series of specimens that represent an undescribed species. Yes, even amongst North America Buprestidae and Cerambycidae there are many species still awaiting discovery (imagine the situation with other families of beetles, many receiving far less attention than these two popular groups).
The beetle shown here, a member of the genus Anambodera, represents one such species. This individual is part of a small series collected in Nothing, Arizona this past summer by Paul Kaufman, an indefatigable amateur beetle collector who has routinely over the years provided fodder for my research in the way of new state records and, more recently, new larval host records through rearing. While the key characters that separate Anambodera from the closely related and exorbitantly speciose genus Acmaeodera (front margin of epistoma not reflexed or plate-like, front angles of pronotum rounded in side view, suture between 1st and 2nd abdominal sterna visible, etc.—see Barr 1972), the coarse elytral punctation and heavily sculptured and bronzed pronotal surface are classic gestalt for Anambodera and unlike any of the small, vittate species of Acmaeodera that they resemble. This specimen keys to A. gemina, but it clearly differs from that species in a number of characters. Anambodera is restricted to western North America, and species tend to be poorly represented in collections due to their more cryptic habits (unlike Acmaeodera, most tend not to visit flowers, but are instead found alighting on rock surfaces or bare soil). As a result, the genus is still incompletely known and in bad need of revision. Dennis Haines and George Walters are working on such a revision and have already found several undescribed species among material collected in Arizona—I’m sure they will be pleased to include these specimens in their study as well.
My sincere thanks to Paul Kaufman for faithfully sending to me for examination his “catch” at the end of each season and allowing me to publish information gleaned from the included specimens. Keep it up, Paul!
REFERENCES:
Barr, W. F. 1972. New genera and species of North American Buprestidae. Occasional Papers of the Biological Society of Nevada 39:1–13.
MacRae, T. C. 2006. Distributional and biological notes on North American Buprestidae (Coleoptera), with comments on variation in Anthaxia (Haplanthaxia) viridicornis (Say) and A. (H.) viridfrons Gory. The Pan-Pacific Entomologist 82(2):166–199.
MacRae, T. C., and G. H. Nelson. 2003. Distributional and biological notes on Buprestidae (Coleoptera) in North and Central America and the West Indies, with validation of one species. The Coleopterists Bulletin 57(1):57–70.
MacRae, T. C. and M. E. Rice. 2007. Distributional and biological observations on North American Cerambycidae (Coleoptera). The Coleopterists Bulletin 61(2):227–263.
Nelson, G. H., and T. C. MacRae. 1990. Additional notes on the biology and distribution of Buprestidae (Coleoptera) in North America, III. The Coleopterists Bulletin44(3):349–354.
Nelson, G. H., R. L. Westcott and T. C. MacRae. 1996. Miscellaneous notes on Buprestidae and Schizopodidae occurring in the United States and Canada, including descriptions of previously unknown sexes of six Agrilus Curtis (Coleoptera). The Coleopterists Bulletin 50(2):183–191.
Copyright © Ted C. MacRae 2011
Swift Tiger Beetle: Species on the Brink
In July 2008, Chris Brown and I made a spur-of-the-moment trip to Hitchcock Preserve near Council Bluffs, Iowa, where only a week earlier Cylindera celeripes (Swift Tiger Beetle), one of North America’s most enigmatic tiger beetles, had just been discovered. Reportedly once common in the blufftop prairies of western Iowa and further west in eastern Nebraska and Kansas, this tiny (6–8 mm in length), flightless beetle has suffered severe population declines over the past 100 years. Only small numbers of individuals have been encountered outside of the type locality (Fort Riley, Kansas) in recent years, and in Nebraska the species is now considered extirpated (Spomer et al. 2008). Our reasons for going to Iowa had to do with our as yet unsuccessful effort to find the species in northwestern Missouri as part of our broader studies of the state’s tiger beetle fauna. Although it had never been recorded from Missouri, we felt there was some chance it might be found in the tiny loess hilltop prairie remnants still remaining in the state at the southern terminus of the Loess Hills landform. We reasoned our failure to find the species might be related to its very small size and rapid running capabilities (giving them more the appearance of small ants or spiders than tiger beetles), limited temporal occurrence, and tendency to hide amongst the bases of grass clumps (Pearson et al. 2006). If we could find the species at a locality where they were known to occur, perhaps an improved search image and better understanding of their precise microhabitat preferences would help us locate the species in Missouri.
Fig. 1. Cylindera celeripes (LeConte) adults at: a) Hitchcock Nature Center, Pottawattamie Co., Iowa (13.vii.2008); b) Alabaster Caverns State Park, Woodward Co., Oklahoma (10.vi.2009); c) same locality as “b”, note parasite (possibly Hymenoptera: Dryinidae) protruding from abdomen and ant head attached to right antenna; d) Brickyard Hill Natural Area, Atchison Co., Missouri (27.vi.2009). Photos by C.R.Brown (a) and T.C.MacRae (b-d).
We didn’t realize it at the time, but that trip marked the beginning of a two-year study that would not only see us succeed in finding C. celeripes in Iowa, but also discover new populations in Missouri and northwestern Oklahoma (Figs. 1a–d). With so much new information about the species and the long-standing concerns by many contemporary cicindelid workers about its status, it seemed appropriate to conduct a comprehensive review of the historical occurrence of this species to establish context for its contemporary occurrence and clarify implications for its long term protection and conservation. This was accomplished through compilation of label data from nearly 1,000 specimens residing in the collections of contemporary tiger beetle workers, all of the major public insect museums in the states of Iowa, Kansas, Missouri, Nebraska, Oklahoma, and Texas, and the collections at the U.S. National Museum and Florida State Collection of Arthropods. Collectively, this material is presumed to represent the bulk of material that exists for the species, representing nearly all localities recorded for the species and time periods in which it has been collected.
Label data confirmed the historical abundance of this species, especially in the vicinity of Manhattan and Fort Riley, Kansas; Lincoln and Omaha, Nebraska; and Council Bluffs, Iowa. Hundreds of specimens were routinely collected in the native grassland habitats around these areas during the late 1800s and early 1900s, their abundance documented by entomologists in both journal articles and private letters. One of the most interesting examples of the latter was by Nebraska collector F. H. Shoemaker, who wrote the following in a 1905 letter to R. H. Wolcott:
There is another trip, down the river to the big spring by the railroad track near Albright, then across the river (the heronry route) where we collect hirticollis, repanda, vulgaris [= tranquebarica], cuprascens, and – vat you call ‘im? – celeripes! I took 147 of the latter in an hour and a half Sunday, and the supply was undiminished.
Fig. 8. Historical and currently known geographical occurrence of Cylindera celeripes by county. Red = last record prior to 1920; orange = last record 1941–1960 (“?” = questionable record); green = last record 1991–1996; blue = last record 2005–2011.
Although the recent collections of C. celeripes from near Council Bluffs and through the years near Fort Riley show that the species has managed to persist in these areas, there is little question that it is far less abundant and widespread now than it was in the early 20th century (Fig. 8). Not only are the areas in which present day populations are known to occur limited, but the numbers of individuals seen in them are very low. In Missouri, the species was listed immediately after its discovery in the state as a species of conservation concern with a status of S1 (= “critically imperiled”) due to the highly restricted occurrence of suitable habitat (loess hill prairie) in the state and small populations observed within them. The situation is even worse in Nebraska, where the species has not been seen for nearly 100 years despite dedicated searches by expert contemporary tiger beetle workers such as Matt Brust and Steve Spomer. Considering the near-complete elimination of suitable native grassland habitats by conversion to agriculture and degradation of the few existing remnants due to encroachment by woody vegetation and invasive exotics, the likelihood of finding extant populations of C. celeripes in Nebraska seems remote. Only in the Red Hills of northwestern Oklahoma does the species appear to be secure due to the extensiveness of suitable areas of habitat and robust numbers of individuals observed within them at the present time. An enigmatic record exists from Arkansas, based on a single individual collected near Calico Rock in 1996. This individual represents a significant extension of the known geographical range of the species, but repeated attempts to find the species at that locality during the past year were not successful.
The persistence of populations, albeit small, in multiple areas, along with the occurrence of robust populations in northwestern Oklahoma, makes it unlikely that C. celeripesqualifies for listing as a threatened or endangered species at the federal level. Nevertheless, the limited availability of suitable habitat in many areas and low population numbers found within them clearly suggest that conservation measures are warranted at the state level, especially in Iowa, Kansas and Missouri, to prevent its extirpation from these states. In these states, land management practices should be implemented at sites known to support populations of the beetle in an effort to maintain and expand the native grassland habitats upon which they rely. These include various disturbance factors such as mechanical removal of woody vegetation, judicious use of prescribed burning, and selective grazing (taking care to do so in a manner that minimizes impacts to beetle populations).
REFERENCES:
MacRae, T. C. and C. R. Brown. 2011. Historical and contemporary occurrence of Cylindera (s. str.) celeripes (LeConte) (Coleoptera: Carabidae: Cicindelinae) and implications for its conservation. The Coleopterists Bulletin 65(3):230–241 DOI: 10.1649/072.065.0304
Pearson, D. L., C. B. Knisley and C. J. Kazilek. 2006. A Field Guide to the Tiger Beetles of the United States and Canada. Oxford University Press, New York, 227 pp.
Spomer, S. M., M. L. Brust, D. C. Backlund and S. Weins. 2008. Tiger Beetles of South Dakota & Nebraska. University of Nebraska, Department of Entomology, Lincoln, 60 pp.
Copyright © Ted C. MacRae 2011
Cycloalexy in tortoise beetle larvae
One of the first insects I encountered during my visit this past November to Reserva Ecológica Costanera Sur in Buenos Aires, Argentina were these tiny beetle larvae grouped together on a single leaf of an unidentified shrub. The presence of fringed lateral appendages and exuvial-fecal debris masses held by caudal appendages immediately identifies them as larvae in the leaf beetle subfamily Cassidinae, known commonly in North America as “tortoise beetles” due to the appearance of the adults. With nearly 3,000 species distributed throughout the world, tortoise beetles are easily recognizable as a group; however, species identifications can be much more difficult, especially in the Neotropics where the group reaches its greatest diversity (Borowiec and Świętojańska 2002–2011). Identification of larvae can be even more challenging, as the larvae of many species remain unknown, and I was unable to find adults in association with the larvae to aid my identification.
Anacassis sp. (poss. exarata) early-instar larvae on Baccharis salicifolia | Buenos Aires, Argentina
Nevertheless, host plant can be an important clue to leaf beetle identity, as most species in the family limit their feeding to a single plant genus or group of related plant genera. The shrub on which the beetles were feeding looked familiar to me, and while perusing a list of plants that have been recorded from the Reserve (Burgueño 2005) I had an “Aha!” moment when I spotted the asteraceous genus Baccharis. I decided the plant must represent Baccharis salicifolia because of its narrowly lanceolate, willow-like leaves with fine apical serrations (Cuatrecasas 1968) (see first photo). The only tortoise beetles known to feed on Baccharis are species in the genus Anacassis (McFadyen 1987), several species of which are known from Argentina, and one (Anacassis exarata) looking very much like the larvae in these photos.
Note the circular, heads-directed-inward orientation of all larvae around the periphery
The manner in which these early-instar (perhaps even newly hatched) larvae were feeding as a group while working their way down the length of the leaf towards its base is not something I had observed before. Larvae of most tortoise beetles are solitary feeders (Borowiec and Świętojańska 2002–2011), and I was further intrigued by the deliberate circular formation that the larvae had assumed. The larvae around the periphery were all facing inward, tightly packed against each other and with their exuvial-fecal debris masses directed outward. Additional larvae were seen inside the circular formation. As I manipulated the leaf for photographs, the larvae would occasionally raise their debris masses up and outward, presumably a defensive reaction to disturbance and a perceived threat. It was clear to me that the larvae had deliberately “circled their wagons” for defensive purposes.
Close body contact allows exuvial-fecal debris masses to form a protective barrier against predators
In fact, this type of defensive strategy has been reported in a number of South American cassidines, as summarized by Jolivet et al. (1990), who coined the term “cycloalexy” (from the Greek κύκλος = circle, and αλεξω = defend) to describe such strategies. Cycloalexy can either be “heads in, tails out” or vice versa and is usually associated with other repellent activities such as coordinated threat movements, regurgitation, or biting. The strategy is intended to provide protection from predators such as ants and true bugs and parasitioid wasps, although some parasitoids seem to have thwarted the strategy by depositing their eggs where they can be ingested (thus avoiding direct confrontation with the prey). Cycloalexy has been described primarily among chrysomelid beetles and tenthredinoid hymenopterans (sawflies); however, examples from a few other insect orders (e.g., Diptera, Neuroptera, Lepidoptera) are known as well (Jolivet 2008). All known cycloalexic insects are subsocial in the larval stage and often also exhibit maternal protection of eggs or newly hatched larvae.
This and several other older larvae had become solitary, presumably protected in part by greater size
In addition to this single group of early instar larvae, I noted also a few larger individuals—all of whom were feeding on the plant in a more solitary fashion. Presumably as the larvae grow larger they are more able to defend themselves, or perhaps larger larvae simply demand more “elbow room” because of the larger amounts of leaf tissue they require for feeding. If cycloalexy is beneficial for small cassidine larvae but less so for larger larvae, perhaps this behavior is actually more common than is currently realized.
REFERENCES:
Borowiec, L., and J. Świętojańska. 2002–2011. Cassidinae of the world – an interactive manual (Coleoptera: Chrysomelidae). http://www.biol.uni.wroc.pl/cassidae/katalog%20internetowy/index.htm [accessed 3 Dec 2011].
Burgueño, G. 2005. Manejo de la vetación en reservas naturales urbanas de la region metopolitana de Buenos Aires. Aves Argentinas, Asociación Ornitológica del Plata, Proyecto Reservas Naturales Urbanas, 16 pp.
Cuatrecasas, J. 1968. Notas adicionales, taxonómicas y corológicas, sobre Baccharis. Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales 13(50):201–226.
Jolivet, P. 2008. Cycloalexy. In: J. L. Capinera [Ed.], Encyclopedia of Entomology, Springer Science+Business Media B.V.
Jolivet, P., Vasconcellos-Neto, J., and Weinstein, P. 1991. Cycloalexy: A new concept in the larval defense of insects. Insecta Mundi 4(1–4) (1990):133–141.
McFadyen, P. J. 1987. Host-specificity of five Anacassis species [Col.: Chrysomelidae] introduced into Australia for the biological control of Baccharis halimifolia [Compositae]. Entomophaga 32(4):377–379.
Copyright © Ted C. MacRae 2011
‘Beetles in the Bush’ T-Shirts now available!
I’ve mentioned before my preference for simple cotton t-shirts over fancy pocketed nylon shirts while I’m out in the field (see Beetle Collecting 101: Dress for Success). Lightweight and comfortable under even the most extreme conditions, they do the job cheaply and effectively. While most any t-shirt will do, I am especially fond of the set I purchased from CafePress, each artfully emblazoned with a stylized image of Cicindela ancosisconensis by Kirk Betts at The Wild Edge. In addition to their lightweight comfort, these shirts leave curious onlookers with little doubt about what I am up to (and of course, I also clearly be stylin’!).
Of course, variety is the spice of life, and I’m happy to now announce a new design created specifically for ‘Beetles in the Bush’. My deepest appreciation to Kirk, who has once again worked his PhotoShop filters magic to create a stylized image of this blog’s icon, the jewel beetle Agelia petalii (see Buppies in the bush(veld) for the original photo of this species that I took in South Africa back in 1999). Men’s, women’s and children’s t-shirts and other apparel bearing this design are now available at the new Beetles in the Bush CafePress online store. Two versions of each item are offered—one with the image and ‘Beetles in the Bush’ logo, and another with the image only, as shown below:
Image w/ logo
Image only
A variety of t-shirt and sweatshirt styles are available, as are coffee mugs for those who (like me) prefer to start their collecting day with a jolt of java! I hope you’ll browse the product selection and find something that you like.
Show your support for ‘Beetles in the Bush’! I don’t expect to get rich off of this, but whatever proceeds from sales that I do get will go a long way towards helping fund future insect collecting and photography expeditions. If you have any feedback on the design/organization of the online store, the products offered, or future designs that you would like to see made available please let me know, either by comment or by contacting me directly.
Copyright © Ted C. MacRae 2011
Speaking of cover photos…
…here is my first—a tropical house gecko (Hemidactylus mabouia) that I photographed in Campinas, Brazil this past January. The photo (originally from my post Brazil Bugs #5 – Lagartixa) was selected for the cover of the October 2011 issue of Ecology and Evolution, having been used by Kristen H. Short and Kenneth Petren (with my permission) for their article, Multimodal dispersal during the range expansion of the tropical house gecko Hemidactylus mabouia.
Although it’s exciting to have that first cover photo under my belt, I find it mildly ironic that it’s not a beetle, insect, or even invertebrate!
Copyright © Ted C. MacRae 2011
Beetles In The Bush 