Tuesday 21 May
Jumping weevil (Rhynchaenus testaceus)
What’s the World’s Favourite Species?Find out here.
Jumping weevil fact file
- Find out more
- Print factsheet
Jumping weevil description
This small jumping weevil, formerly known as Orchestes scutellaris (2), is reddish in colour, and has a long, elongated snout known as a 'rostrum' (4). It also has enlarged hind femora adapted to jumping (a characteristic of the genus) (2).
- Length: 2.5 - 3.5 mm (2)
Jumping weevil biology
Very little is known of the ecology of the species, but it is known that the larvae live and feed inside alder leaves (3). Larvae produce short, serpentine leaf mines culminating abruptly in an enlarged leaf edge 'blotch'. When fully grown, larvae pupate in a rounded leaf edge cocoon. Adults have been found throughout the summer from May to September. It seems likely that they emerge in July and August and hibernate as adults. (This is known to be the case with the commoner closely related R. fagi). Other species of Rhynchaenus are known to produce sound by 'stridulation' in a similar way to grasshoppers; it is not known whether R. testaceus shares this characteristic (2).Top
Jumping weevil range
This weevil has always been scarce, but since 1940 it has been found only very sporadically, in east Cornwall in 1978, west Norfolk in 1987 and 1988, and Huntingdonshire in 1991 (3), 2001 and 2002 (2). Outside Britain it has a wide distribution, occurring in northern USA and southern Canada, and throughout much of Europe, reaching into Asia (3).Top
Jumping weevil habitatTop
Jumping weevil status
Classified as Vulnerable in Great Britain (3).Top
Jumping weevil threats
The reasons for the scarcity of this weevil are unclear (3); it is possible that its preference for alder growing in unusually dry conditions is a limiting factor. Furthermore, the beetle is inconspicuous so it may well be under-recorded (2).Top
Jumping weevil conservation
Listed under the UK Biodiversity Action Plan (UK BAP), the main aims for the conservation of this species are to maintain the current populations, with enhancement by the year 2010 and to establish populations at 6 sites within the former range before 2010 (3). Research into the weevil's biology and habitat preferences is currently being carried out at the University of Leeds, in order to inform conservation management recommendations (2).Top
Find out more
For more on English Nature's Species Recovery Programme see:
Information authenticated by Jon Mellings (independent ecologist).Top
- Term used to describe wet habitats. In East Anglia it is used to refer to wet woodlands, especially alder woods.
- Femora (or femur)
- In insects, the third segment in the leg, the largest segment of the leg in most adult insects. In tetrapods (vertebrates with four limbs) the upper bone of the hind limb.
- A winter survival strategy characteristic of some mammals in which an animal's metabolic rate slows down and a state of deep sleep is attained. Whilst hibernating, animals survive on stored reserves of fat that they have accumulated in summer. In insects, the correct term for hibernation is 'diapause', a temporary pause in development and growth. Any stage of the lifecycle (eggs, larvae, pupae or adults) may enter diapause, which is typically associated with winter.
- Stage in an animal's lifecycle after it hatches from the egg. Larvae are typically very different in appearance to adults; they are able to feed and move around but usually are unable to reproduce.
- The process of forming a pupa, the stage in an insect's development, when huge changes occur that reorganise the larval form into the adult form. In butterflies the pupa is also called a chrysalis.
- National Biodiversity Network Species Dictionary (September 2002) http://www.nhm.ac.uk/nbn/
- Mellings, J. (2002) Pers. Comm.
- UK BAP (September 2002) http://www.ukbap.org.uk
- Personal observation from images
- English Nature. Species and habitat associations (September 2002) http://www.english-nature.org.uk/baps/species/overview.asp?Id=552&Habitat_Key=4&sType=C&PrevPage=habitat
MyARKive offers the scrapbook feature to signed-up members, allowing you to organize your favourite ARKive images and videos and share them with friends.
Terms and Conditions of Use of Materials
Copyright in this website and materials contained on this website (Material) belongs to Wildscreen or its licensors.
Visitors to this website (End Users) are entitled to:
- view the contents of, and Material on, the website;
- download and retain copies of the Material on their personal systems in digital form in low resolution for their own personal use;
- teachers, lecturers and students may incorporate the Material in their educational material (including, but not limited to, their lesson plans, presentations, worksheets and projects) in hard copy and digital format for use within a registered educational establishment, provided that the integrity of the Material is maintained and that copyright ownership and authorship is appropriately acknowledged by the End User.
End Users shall not copy or otherwise extract, alter or manipulate Material other than as permitted in these Terms and Conditions of Use of Materials.
Additional use of flagged material
Green flagged material
Certain Material on this website (Licence 4 Material) displays a green flag next to the Material and is available for not-for-profit conservation or educational use. This material may be used by End Users, who are individuals or organisations that are in our opinion not-for-profit, for their not-for-profit conservation or not-for-profit educational purposes. Low resolution, watermarked images may be copied from this website by such End Users for such purposes. If you require high resolution or non-watermarked versions of the Material, please contact Wildscreen with details of your proposed use.
Creative commons material
Certain Material on this website has been licensed to Wildscreen under a Creative Commons Licence. These images are clearly marked with the Creative Commons buttons and may be used by End Users only in the way allowed by the specific Creative Commons Licence under which they have been submitted. Please see http://creativecommons.org for details.
Any other use
Please contact the copyright owners directly (copyright and contact details are shown for each media item) to negotiate terms and conditions for any use of Material other than those expressly permitted above. Please note that many of the contributors to ARKive are commercial operators and may request a fee for such use.
Save as permitted above, no person or organisation is permitted to incorporate any copyright material from this website into any other work or publication in any format (this includes but is not limited to: websites, Apps, CDs, DVDs, intranets, extranets, signage, digital communications or on printed materials for external or other distribution). Use of the Material for promotional, administrative or for-profit purposes is not permitted.