Leaf beetles
By Dave Hubble
()
About this ebook
Leaf beetles are one of the largest groups of beetles, with tens of thousands of species worldwide and around 280 in Britain. They belong mainly to the family Chrysomelidae, but also to two small closely related families, the Megalopodidae and Orsodacnidae. This book provides a comprehensive overview with detailed and accessible coverage of the natural history, ecology and biology of leaf beetles.
Topics cover the life history of leaf beetles, biology, their environment, natural enemies and interactions with humans. There is a thorough discussion about identification of British species, including detail on the juvenile stages (eggs, larvae, pupae) and a concise key to adults. A chapter is dedicated to study techniques and materials. The book is illustrated throughout with colour photographs and line drawings.
Leaf beetles is a vital resource for entomology students and educators, naturalists, nature conservationists, those involved in agriculture, horticulture and the management of stored produce.
Dave Hubble
Dave Hubble is a freelance ecologist. He is the organiser of the UK's Chrysomelidae Recording Scheme and recently wrote the AIDGAP key to UK species. He also teaches Environmental Science at the Open University. Dave's blog can be found at davehubbleecology.blogspot.co.uk
Related to Leaf beetles
Titles in the series (10)
Ladybirds Rating: 0 out of 5 stars0 ratingsAphid predators Rating: 0 out of 5 stars0 ratingsAnimals of the surface film Rating: 0 out of 5 stars0 ratingsInsects, plants and microclimate Rating: 0 out of 5 stars0 ratingsSnails on rocky sea shores Rating: 0 out of 5 stars0 ratingsAmphibians and reptiles Rating: 0 out of 5 stars0 ratingsPonds and small lakes: Microorganisms and freshwater ecology Rating: 0 out of 5 stars0 ratingsSolitary bees Rating: 0 out of 5 stars0 ratingsLeaf beetles Rating: 0 out of 5 stars0 ratingsRock pools Rating: 0 out of 5 stars0 ratings
Related ebooks
A Guide to the Beetles of Australia Rating: 0 out of 5 stars0 ratingsDragonflies of the World Rating: 5 out of 5 stars5/5Moths Rating: 4 out of 5 stars4/5Pocket Guide to Insects Rating: 0 out of 5 stars0 ratingsField Guide to the Common Bees of California: Including Bees of the Western United States Rating: 4 out of 5 stars4/5Bumble Bees of North America: An Identification Guide Rating: 0 out of 5 stars0 ratingsAmphibians and reptiles Rating: 0 out of 5 stars0 ratingsInsects of South-Eastern Australia: An Ecological and Behavioural Guide Rating: 5 out of 5 stars5/5Reptiles of Victoria: A Guide to Identification and Ecology Rating: 0 out of 5 stars0 ratingsA Guide to Australian Moths Rating: 4 out of 5 stars4/5Field Guide to the Frogs of Australia Rating: 4 out of 5 stars4/5Raptors: The Curious Nature of Diurnal Birds of Prey Rating: 5 out of 5 stars5/5The Complete Field Guide to Dragonflies of Australia Rating: 4 out of 5 stars4/5Alien Plants Rating: 0 out of 5 stars0 ratingsBees of Australia: A Photographic Exploration Rating: 5 out of 5 stars5/5Birds and Men Rating: 0 out of 5 stars0 ratingsSolitary bees Rating: 0 out of 5 stars0 ratingsBadger Rating: 0 out of 5 stars0 ratingsThe Book of Frogs: A Life-Size Guide to Six Hundred Species from Around the World Rating: 4 out of 5 stars4/5The Complete Field Guide to Stick and Leaf Insects of Australia Rating: 5 out of 5 stars5/5A Guide to Stag Beetles of Australia Rating: 0 out of 5 stars0 ratingsBirds of Prey of Australia: A Field Guide Rating: 0 out of 5 stars0 ratingsGarter Snakes and Water Snakes: From the Experts at Advanced Vivarium Systems Rating: 0 out of 5 stars0 ratingsInsect Migration Rating: 0 out of 5 stars0 ratingsFungi Rating: 4 out of 5 stars4/5Ten Thousand Birds: Ornithology since Darwin Rating: 3 out of 5 stars3/5Rust, Smut, Mildew, & Mould: An Introduction to the Study of Microscopic Fungi Rating: 0 out of 5 stars0 ratingsWild Coast: An exploration of the places where land meets sea Rating: 2 out of 5 stars2/5RSPB Spotlight Bats Rating: 0 out of 5 stars0 ratings
Biology For You
Why We Sleep: Unlocking the Power of Sleep and Dreams Rating: 4 out of 5 stars4/5The Source: The Secrets of the Universe, the Science of the Brain Rating: 4 out of 5 stars4/5Gut: The Inside Story of Our Body's Most Underrated Organ (Revised Edition) Rating: 4 out of 5 stars4/5Peptide Protocols: Volume One Rating: 4 out of 5 stars4/5The Soul of an Octopus: A Surprising Exploration into the Wonder of Consciousness Rating: 4 out of 5 stars4/5"Cause Unknown": The Epidemic of Sudden Deaths in 2021 & 2022 Rating: 5 out of 5 stars5/5Sapiens: A Brief History of Humankind Rating: 4 out of 5 stars4/5The Laws of Connection: The Scientific Secrets of Building a Strong Social Network Rating: 0 out of 5 stars0 ratingsOur Kind of People: Inside America's Black Upper Class Rating: 3 out of 5 stars3/5The Sixth Extinction: An Unnatural History Rating: 4 out of 5 stars4/5Other Minds: The Octopus, the Sea, and the Deep Origins of Consciousness Rating: 4 out of 5 stars4/5A Crack In Creation: Gene Editing and the Unthinkable Power to Control Evolution Rating: 4 out of 5 stars4/5The Winner Effect: The Neuroscience of Success and Failure Rating: 5 out of 5 stars5/5The Art of Thinking Clearly Rating: 4 out of 5 stars4/5Lifespan: Why We Age—and Why We Don't Have To Rating: 4 out of 5 stars4/5Homo Deus: A Brief History of Tomorrow Rating: 4 out of 5 stars4/5Mothers Who Can't Love: A Healing Guide for Daughters Rating: 4 out of 5 stars4/5The Grieving Brain: The Surprising Science of How We Learn from Love and Loss Rating: 4 out of 5 stars4/5Dopamine Detox: Biohacking Your Way To Better Focus, Greater Happiness, and Peak Performance Rating: 3 out of 5 stars3/5Emotional Blackmail: When the People in Your Life Use Fear, Obligation, and Guilt to Manipulate You Rating: 4 out of 5 stars4/5The Obesity Code: the bestselling guide to unlocking the secrets of weight loss Rating: 4 out of 5 stars4/5Mother of God: An Extraordinary Journey into the Uncharted Tributaries of the Western Amazon Rating: 4 out of 5 stars4/5The Deepest Well: Healing the Long-Term Effects of Childhood Trauma and Adversity Rating: 4 out of 5 stars4/5Sapiens: A Graphic History, Volume 2: The Pillars of Civilization Rating: 4 out of 5 stars4/5Ultralearning: Master Hard Skills, Outsmart the Competition, and Accelerate Your Career Rating: 4 out of 5 stars4/5How Emotions Are Made: The Secret Life of the Brain Rating: 4 out of 5 stars4/5A Letter to Liberals: Censorship and COVID: An Attack on Science and American Ideals Rating: 3 out of 5 stars3/5The Book of Fungi: A Life-Size Guide to Six Hundred Species from around the World Rating: 4 out of 5 stars4/5
Reviews for Leaf beetles
0 ratings0 reviews
Book preview
Leaf beetles - Dave Hubble
Naturalists’ Handbooks 34
Leaf
beetles
DAVE HUBBLE
Pelagic Publishing
www.pelagicpublishing.com
Published by Pelagic Publishing
www.pelagicpublishing.com
PO Box 725, Exeter, EX1 9QU, UK
Leaf beetles
Naturalists’ Handbooks 34
Series Editor
William D.J. Kirk
ISBN 978-1-78427-150-3 (Pbk)
ISBN 978-1-78427-158-9 (ePub)
ISBN 978-1-78427-160-2 (PDF)
Text © Pelagic Publishing 2017
Dave Hubble asserts his moral right to be identified as the author of this work.
All rights reserved. Apart from short excerpts for use in research or for reviews, no part of this document may be printed or reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, now known or hereafter invented or otherwise without prior permission from the publisher.
British Library Cataloguing in Publication Data A catalogue record for this book is available from the British Library
Cover photographs
Top: Scarlet lily beetle Lilioceris lilii on damaged leaf (Henrik Larsson)
Bottom left: Donacia sp. on yellow flag iris (Dave Hubble)
Bottom-right: Alder leaf beetle Agelastica alni on garden plant (Dave Hubble)
Contents
Editor’s preface
Acknowledgements
About the author
About Naturalists’ Handbooks
1.Introduction
2.Life history
3.Leaf beetles in their environment
4.Natural enemies of leaf beetles
5.Distribution and abundance
6.Identification of adults of British and Irish leaf beetles
Key A Subfamilies and small families
Key B Subfamily Cassidinae
Key C Subfamilies Bruchinae and Amblycerinae
Key D Subfamily Donaciinae
Key E Subfamily Criocerinae
Key F Subfamily Cryptocephalinae
Key G Subfamily Galerucinae
Key H Subfamily Chrysomelinae
7.Study techniques and materials
8.Useful addresses and links
9.References and further reading
Index
Editor’s preface
Leaf beetles are a fascinating and distinctive group of plant-feeding beetles with a rich diversity of interesting features. They are not as well known as ladybird beetles, but they can match them for attractive appearance and remarkable behaviours. Many of the adults are brightly coloured or are a metallic blue, green, purple, brass or bronze colour. They include garden pests such as the lily beetle, crop pests such as the cabbage stem flea beetle and invasive pests such as the Colorado potato beetle. Some common leaf beetles are even beneficial pollinators. In contrast, there are also many rarities such as the tansy beetle and the hazel pot beetle, and species that may now be extinct in the British Isles, such as the Pashford pot beetle. There are species that exude noxious fluid or feign death to defend themselves, species that make audible squeaks and species that can jump further than fleas in relation to their body length.
This Naturalists’ Handbook provides an introduction to the natural history, behaviour and ecology of the leaf beetles, and advice on how to find and study them, together with an identification key and a checklist.
I hope that this book will encourage more people to study leaf beetles. There is much to discover about even the commonest species and they are easy to find. A wide range of habitats support leaf beetles, including gardens, crops and urban brownfield sites. Species records can make useful contributions to mapping schemes, which can then be used to show the effects of climate change or changes in land use.
This Naturalists’ Handbook on leaf beetles complements other titles in the series on beetles: Ladybirds (no. 10), Common ground beetles (no. 8) and Weevils (no. 16). Leaf beetles are also described within their habitats in Insects on cabbages and oilseed rape (no. 18) and Insects on dock plants (no. 26).
William D.J. Kirk
February 2017
Acknowledgements
First of all, my thanks go to the staff of the Biological Records Centre for all their help developing and inspiring my work as an entomologist. In particular, Helen Roy and Björn Beckmann have been instrumental in providing encouragement, access to academic reprints and other material, and giving me the initial nudge to take on the Chrysomelidae Recording Scheme.
I am equally indebted to Rebecca Farley for her generous permission to re-use material from my AIDGAP publication – essential for producing the key in this book.
Thanks are also due to Darren Mann and Amoret Spooner for access to the Oxford University Museum of Natural History’s biological collection, without which this book would be much less well illustrated.
Lastly, there are more entomologists than I can possibly name whose records have helped inform this work. Their efforts are much appreciated as without them, there would be no knowledge of species distribution or many other aspects of chrysomelid life.
About the author
Dave Hubble works in Environmental Science for The Open University, where he particularly enjoys getting students away from their computers and out into the field. He has been a fan of invertebrates and their diversity since first encountering vast arrays of pinned specimens as a child visiting London’s Natural History Museum. As well as various academic papers, he has published an identification key to leaf beetles in the AIDGAP series (2012) and wrote the latest Status Review of the group (2014). As well as being involved in various Working Groups covering topics such as Pollinators, he is a Fellow of the Royal Entomological Society, and organises the national Chrysomelid Recording Scheme. When not tinkering with small Coleoptera, he is a professional poet and artist, and is involved with various social and environmental campaigns.
About Naturalists’ Handbooks
Naturalists’ Handbooks encourage and enable those interested in natural history to undertake field study, make accurate identifications and make original contributions to research.
A typical reader may be studying natural history at sixth-form or undergraduate level, carrying out species/habitat surveys as an ecological consultant, undertaking academic research or just developing a deeper understanding of natural history.
1 Introduction
Leaf beetles are not as well known as ladybirds, but they too have many species that are distinctively patterned and dome-shaped. In addition, there are ten times more species and many of them are important crop pests. They are an attractive, fascinating and important group of beetles that deserves to be better known. The aim of this book is to introduce the leaf beetles and provide information to allow anyone to find and study them.
1.1 What are leaf beetles?
The leaf beetles are a large group with nearly 300 species in the British Isles (Table 1.1), and an estimated 40,000 worldwide in over 2,500 genera, making them one of the most diverse and regularly encountered beetle groups. As their common name suggests, they are all herbivorous and closely associated with plants, where they feed on various parts, not only leaves. Being beetles, they have biting mouthparts (unlike the piercing-sucking mouthparts of the Hemiptera or ‘true bugs’) and forewings that are hardened to form elytra (wing cases) covering the abdomen when viewed from above.
Most are in the family Chrysomelidae, with a small number of species in the closely related Megalopodidae and Orsodacnidae – collectively these three families constitute the leaf beetles and they are also generally referred to as ‘chrysomelids’, because previously, these three families were classified together in the Chrysomelidae. It is important to become familiar with the main features of the various subfamilies as this makes identification quicker, and a brief introduction to them follows.
Table 1.1 Numbers of British leaf beetles by family and subfamily
Amblycerinae. These are similar in appearance to the Bruchinae and also associated with legumes. They were previously grouped with them as a separate family.
Bruchinae. Previously considered as part of a separate family, bruchines have been variously known as seed beetles, pea weevils, bean weevils, bean beetles and beanseed beetles because of their association with the seeds of leguminous plants. Many are pests of such crops, including dried and stored produce, especially in tropical and subtropical areas.
Cassidinae. Previously considered to be a tribe (Cassidini) of the subfamily Hispinae (which is not found in Britain), cassidines are now given subfamily status. They are commonly known as the ‘tortoise beetles’ owing to their dorsally flat-domed and more-or-less rounded appearance.
Chrysomelinae. Chrysomelines are the ‘typical’ (i.e. domed, relatively large and often metallic in colour) leaf beetles and include many of the more charismatic species within the British chrysomelid fauna, such as the rare tansy beetle Chrysolina graminis.
Criocerinae. In Britain, a small subfamily of relatively elongate, parallel-sided beetles represented by eight species including the introduced lily beetle Lilioceris lilii. All have a notch on the inner edge of the eye, although this may be slight.
Cryptocephalinae. A subfamily consisting of two tribes in Britain: the Clytrini (composed of one scarce and one recently extinct species) and the Cryptocephalini (all belonging to the genus Cryptocephalus). The genus Cryptocephalus includes several rare or endangered species and they are known colloquially as ‘pot beetles’ because of the appearance of the cocoons their larvae live in. These are initially built by the female during and immediately after egg laying, with the egg being held between the rear tarsi (feet) and covered by her faeces. Once covered, the pots are dropped to the ground among leaf litter, which often forms much of the larval diet, and the larvae add their own faecal material to their cocoons as they grow. The precise structure of these cocoons varies by species.
Donaciinae. Commonly known as the ‘reed beetles’ and associated with plants in or near water bodies and wetlands. Donaciines are more elongate than many other chrysomelids and many are distinctive, being brightly metallic in colour.
Eumolpinae. A small subfamily known by a single species in Britain, Bromius obscurus. They are superficially similar to the Chrysomelinae, but can be distinguished by features of the legs.
Galerucinae. A large subfamily comprising two tribes, the Galerucini and Alticini, both of which have previously been considered separate subfamilies. The Alticini are known as ‘flea beetles’ because of the well-developed flea-like jumping abilities of the adults and have been known as both the Halticinae and Alticinae. Examples include the cabbage-stem flea beetle, Psylliodes chrysocephala.
Lamprosomatinae. A small subfamily known by a single species in Britain, Oomorphus concolor. Like the Cryptocephalinae, they form cocoons from faecal matter.
Orsodacninae. In Britain, this is the only subfamily within the family Orsodacnidae. There is a single genus Orsodacne in Britain, consisting of two species of relatively elongate beetles. The subfamily was previously placed within the Chrysomelidae.
Zeugophorinae. In Britain, this is the only subfamily within the family Megalopodidae. There is a single genus Zeugophora in Britain, consisting of three species of relatively elongate beetles. It was previously placed within the Criocerinae and later the Orsodacninae, which is now a separate family, the Orsodacnidae. Some authors (e.g. Zaitsev & Medvedev, 2009*) place it (along with the Orsodacninae) within the Chrysomelidae.
1.2 Adult external morphology
Chrysomelids are small to medium-sized beetles – in Britain ranging from a little over 1 mm in length (Mniophila muscorum and Longitarsus minusculus) to 18 mm in large specimens of Timarcha tenebricosa. Their overall shape varies from being somewhat elongate (e.g. Donaciinae) to oval and domed (in many subfamilies) or rounded and flattened (Cassidinae) (Figs. 1.1–1.5).
Fig. 1.1 Dorsal view of a typical chrysomelid.
Fig. 1.2 Ventral view of a typical chrysomelid.
Fig. 1.3 Ventral view of a typical cassidine.
Fig. 1.4 Dorsal view of a typical cassidine.
The antennae are usually thread-like (filiform), although in some taxa (e.g. Bruchidius) they may be saw-toothed (serrate) or have modified and expanded segments (e.g. males of Phyllotreta exclamationis and Phyllotreta nodicornis) (Fig. 1.6). There are 11 antennal segments except in Psylliodes species, which have 10. The antennae are never clubbed, unlike those of the ladybirds, which some leaf beetles resemble.
Fig. 1.5 A pair of Donacia showing their elongate form.
Fig. 1.6 A selection of antennal forms in the Chrysomelidae.
In the flea beetles (Alticini), the hind femora are enlarged (Fig. 1.7) and contain a chitinous ‘metafemoral spring’ which allows them to jump by releasing stored energy generated by the tibial extensor muscle (Fig. 1.8). The shape of the spring varies between genera and therefore could, in principle, be useful in identification. The tarsi are all 4-segmented and in most species at least some are bilobed (if not, then the final tarsal segment is elongate as in Macroplea).
Fig. 1.7 Hind leg of a typical alticine.
Fig. 1.8 Metafemoral spring.
The head of a chrysomelid has a pair of compound eyes and mouthparts adapted for plant-feeding. The point of attachment of the antennae relative to the eyes can be useful in identification, as can the grooves and bulges of the head (Figs. 1.9, 1.10).
In most chrysomelids, the elytra cover the full length of the abdomen, although in the Bruchinae, the final segment (pygidium) remains exposed, and in some Galerucinae they may be shortened. Gravid (egg-bearing) females of some species, such as the common green dock beetle Gastrophysa viridula, have a swollen abdomen, which forces the elytra apart. The elytra may also be patterned as in a number of Cryptocephalus species. As well as aiding identification, these spotted patterns are likely to provide protection through mimicry of