Research Article |
Corresponding author: Steen Dupont ( steen.dupont@nhm.ac.uk ) Academic editor: Shaun Winterton
© 2015 Steen Dupont, Benjamin Price, Vladimir Blagoderov.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Dupont S, Price B, Blagoderov V (2015) IMp: The customizable LEGO® Pinned Insect Manipulator. ZooKeys 481: 131-138. https://doi.org/10.3897/zookeys.481.8788
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We present a pinned insect manipulator (IMp) constructed of LEGO® building bricks with two axes of movement and two axes of rotation. In addition we present three variants of the IMp to emphasise the modular design, which facilitates resizing to meet the full range of pinned insect specimens, is fully customizable, collapsible, affordable and does not require specialist tools or knowledge to assemble.
Specimen Manipulator, Entomology, Stage, Digitization, Imaging
Natural history collections are one of the most fundamentally important institutions in science, where voucher specimens are housed in perpetuity, embodying the research of generations of scientists. Within entomology collections insects were historically preserved by drying on an appropriately sized pin. Today insect groups are preserved in ethanol, mounted on microscope slides or in paper or plastic envelopes, but the dry pinned method has not changed for the majority of insect orders since its development in the early 18th century. This has resulted in millions of pinned insect specimens housed in natural history collections globally, for example the pinned insect collection of the Natural History Museum (NHM) in London comprises 136500 drawers and is estimated to contain 27 million pinned specimens.
Although pinned specimens preserve well they become fragile with age and are prone to damage when handled. This has become especially apparent in the digital age where there is an increased focus on mobilizing the vast amounts of biodiversity data stored in the collections through digitization activities. Institutions are now able to provide images of specimens on request (termed a “digital loan” at the NHM), when researchers cannot view the specimens directly and they are too fragile to ship. In addition some institutions do not loan primary type material, compounding the need to image specimens in order to examine them remotely. The net result of improving access to collections through digitization efforts is that the specimens are made available without the need of excessive handling. This goal however can only be achieved when there are images of multiple taxonomically meaningful views available, as required for accurate remote examination.
Most commonly, pinned insect specimens are observed through stereo microscopes at the 10-80× range of magnification. Under magnification specimens can become difficult to handle as minute movements are amplified. In order to provide stabilization specimens are often pinned to a flexible material such as cork, plastazote foam or putty when the desired angle is found or alternatively the specimen is mounted into a specimen manipulator that enables repositioning during observation.
With the rapid increase in collections digitization, museum specimens are handled to a much larger extent than ever before. Positioning and repositioning of specimens during digitization is often required for the majority of specimen handling in a collection. As handling of pinned specimens carries the most immediate risk of damage, especially to the fragile extremities (e.g. legs, antenna and wings) specimen manipulators are of great value to the overall preservation of a functioning pinned natural history collection.
A good insect specimen manipulator requires the following properties: (i) Foremost the manipulator should allow for easy positioning and repositioning of specimens especially if used for imaging at multiple views or comparing structures at different angles; (ii) Stability to prevent the specimen moving once in the correct position; (iii) Capability of fine scale adjustment to enable positioning the specimen under magnification and (iv) Open design to allow for both specimen placement/removal and adequate illumination of the specimen to be examined.
There are several good designs available from commercial and amateur DIY websites such as the Universal Stage (http://extreme-macro.co.uk/universal-stage/), Rose Entomology (http://www.roseentomology.com/Pinned_Specimen_Manipulator.htm), BioQuip Microscope Stages 6186 and 6188 (http://www.bioquip.com/search/DispProduct.asp?pid=6186; http://www.bioquip.com/search/DispProduct.asp?pid=6188) and the Watkins & Doncaster Insect Examination Stage (http://www.watdon.co.uk/acatalog/Microscope_Accessories.html). In addition there are variants of the steel / brass ball & ring stage combination (Ento / Ergo Ball: details available on request).
Previous authors have provided custom designs for insect specimen manipulators (
The idea of a holding mechanism for pinned specimens is as old as the pinned specimen itself. The design of these particular models were inspired by the daily grind of comparative morphology and the association to mass digitization and digital loans that the first author has had at the natural history museums of Denmark and London. Although the LEGO® brick has always been a working tool it has served more as a means of prototyping ideas, but in this case the authors found the plastic bricks to have the right properties for the product presented here. It is in fact the simple nature of the LEGO® bricks, their availability and ease of use that we feel make these models so customizable, user friendly, affordable and hassle free.
The Insect specimen manipulator (IMp) and subsequent size/design variants were built and designed using both the LEGO® building blocks and the LEGO® Digital designer software version 4.3.8 (http://ldd.lego.com/en-gb/) using beams, beam connectors, connecting pins, an 8 tooth spur gear and a worm gear. For a complete parts list and assembly manual for all IMp models see the supplementary information (https://doi.org/10.5519/0036449).
The data underpinning the analysis reported in this paper are deposited in the NHM Data Portal at https://doi.org/10.5519/0036449.
Etymology: IMp is an abbreviation of Insect Manipulator and references the attendant imp of folklore that is usually cast as the small, mischievous helper, associated with witches and warlocks, the academics of mythology.
Initially a single enclosed IMp design was conceived (Figures
The four different sized manipulators shown for comparison: a Giant-IMp b IMp models with encasing support beams c Open-IMp d Micro-IMp models that are not encased. The specimens in the manipulators are: a Nosa tristis (Hagen, 1853) – Neuroptera: Myrmeleontidaeb Perissoneura paradoxa McLachlan, 1871 – Trichoptera: Odontoceridaec Pteronarcys californica Newport, 1848 – Plecoptera: Pteronarcyidae and d Psychopsis coelivaga (Walker, 1853) – Neuroptera: Psychopsidae.
The IMp model shown from a side view (A), front view (B), top view (C) and without the stabilizing case exposing the pivot arm wherein the specimen is placed (D). Figure labels and abbreviations: pivot handle (1), 8 tooth gear (2), worm gear (3), connector peg that holds and rotates the specimen (4), axis of movement 1 (A1), axis of movement 2 (A2), axis of rotation 1 (R1) and axis of rotation 2 (R2).
Model name | Maximum specimen size |
Cost |
Design |
---|---|---|---|
IMp | 50 | 9 | closed |
Micro- | 30 | 7 | open |
Open- | 60 | 8 | open |
Giant- | 110 | 15 | closed |
The bricks for all models can be bought directly from the LEGO® websites’ Pick a Brick (http://shop.lego.com/en-GB/Pick-A-Brick-ByTheme) and the Bricks and Pieces selection (https://service.lego.com/en-gb/replacementparts#BasicInfo). Besides the LEGO® bricks the models each require a small plastazote foam / cork plug or other material that will allow for the pin to be held in place (Figure
We believe the insect specimen manipulators presented here are a valuable addition to any entomologist’s toolbox and that the use of any insect manipulator is in the interest of anyone dealing with valuable specimens as the actual handling of the specimen is reduced to a minimum during examination. In case of the original IMp and Giant-IMp models the specimens are further protected from accidental contact during examination by the supporting cube structure. These LEGO® based manipulators benefit from their modular design as they are inexpensive and made from readily available components. Furthermore, even the largest of the models can be disassembled for travel. The open design further allows for the addition of portable lighting solutions (such as LEDs) and an endless amount of customization which makes them ideal for specimen imaging. Future modifications of the IMp models may include the addition of motorized control, using Arduino controllers or native LEGO® motors and software from the LEGO® mindstorms range.
The authors welcome correspondence on ideas for the next generation of IMps, and although the current models are easy to assemble the authors are happy to assist if no children can be sourced locally.
We would like to thank the Villum Kann Rasmussen Foundation and the Carlsberg Fund for their support, the Natural History Museum of London for providing facilities and workspace; and the Sackler Biodiversity Imaging lab for providing imaging equipment and microscopes that were used to evaluate the model designs. We would also like to thank the reviewers for their efforts and comments.
Annotated building instructions
Data type: Adobe PDF file.
Explanation note: Assembly manual for all IMp models.
Video demontration
Data type: MOV file.