Tuesday, October 18, 2011


butterfly is a mainly day-flying insect of the order Lepidoptera, the butterflies and moths. Like other holometabolous insects, the butterfly's life cycle consists of four parts: egglarva,pupa and adult. Most species are diurnal. Butterflies have large, often brightly coloured wings, and conspicuous, fluttering flight. Butterflies comprise the true butterflies (superfamilyPapilionoidea), the skippers (superfamily Hesperioidea) and the moth-butterflies (superfamilyHedyloidea). All the many other families within the Lepidoptera are referred to as moths. The earliest known butterfly fossils date to the mid Eocene epoch, between 40-50 million years ago.[1]

Butterflies exhibit polymorphismmimicry and aposematism. Some, like the Monarch, willmigrate over long distances. Some butterflies have evolved symbiotic and parasitic relationships with social insects such as ants. Some species are pests because in their larval stages they can damage domestic crops or trees; however, some species are agents ofpollination of some plants, and caterpillars of a few butterflies (e.g., Harvesters) eat harmful insects. Culturally, butterflies are a popular motif in the visual and literary arts.

Tuesday, September 13, 2011


History of studies on butterflies

The first work dealing with Sri Lankan butterflies was that of Frederic Moore in 1880, followed by pioneering stuidies based on field observations by Ormiston[disambiguation needed] in 1924, Woodhouse[disambiguation needed] and Henry[disambiguation needed] in 1942 and byWoodhouse[disambiguation needed] in 1950. Bernard d'Abrera published his work in 1998 based on examination of specimens in the Natural History Museum in London. Recently, papers have been published on status of particular butterfly families, check-lists of various localities, life-cycles and natural history as well as butterfly migration.

Endemism

The Ceylon Birdwing is one of the largest endemics of the country and is found in large numbers in the Sinharaja Forest Reserve.[3] Eleven families of the order are represented in Sri Lanka, viz. DanaidaeSatyridaeAmathusiidaeNymphalidaeAcraeidaeLibytheidaeRiodinidae,LycaenidaePieridaePapilionidae and Hesperiidae.[1]

New species

In 2008, Dr. Michael van der Poorten discovered a new species of Sri Lankan butterfly, the first such discovery in 60 years.[4] The species has been identified as Catopsilia Scylla.

Conservation

Habitat destruction and degradation, air pollutionover-usage of pesticides, and over-exploitation for ornamental trade are the main threats to butterflies in Sri Lanka.[2] Prolonged droughts and over-predation also pose a threat to them. Opportunistic predators such as ants and birds prey on butterfly eggs, caterpillarspupae and adult individuals. The Ceylon Rose and Ceylon Birdwing species are presently included in the appendices of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). This United Nations initiative aims to protect these species against over-exploitation by restricting trade across borders.

Endemic species

Ceylon Birdwing is the largest butterfly endemic to Sri Lanka.
A majority of endemic species are restricted to the wet zone forests.[2]
Common nameBinomial name
Ceylon Tree-NymphIdea iasonia
Ceylon TigerParantica taprobana
Ceylon PalmflyElymnias singhala
Ceylon TreebrownLethe daretis
Ceylon ForesterLethe dynsate
Cingalese BushbrownMycalesis rama
Jewel Four-ringYpthima singala
Blue Oak LeafKallima philarchus
Ormiston's OakblueArhopala ormistoni
Ceylon CeruleanJamides coruscans
Milky CeruleanJamides lacteata
Woodhouse's Four LineblueNacaduba ollyetti
Pale Ceylon Six LineblueNacaduba sinhala
Green's SilverlineSpindasis greeni
Clouded SilverlineSpindasis nubilus
Ceylon Indigo RoyalTajuria arida
Ceylon Hedge BlueUdara lanka
Lesser AlbatrossAppias galene
One Spot Grass YellowEurema andersonii
Ceylon RosePachliopta jophon
Common BirdwingTroides darsius
Black FlatCelaenorrhinus spilothyrus
Decorated AceHalpe decorata
source: srilankaninsects.net[1