Mexico, USA & Canada
Family - NYMPHALIDAE
Tribe - HELICONIINI
Heliconius cydno galanthus
© Maris Pukitis
The tribe Heliconiini, colloquially known as Longwings, includes 71
species, all confined exclusively to the neotropics.
Heliconiini includes the genera Heliconius,
The 39 Heliconius species are much
studied by geneticists and taxonomists. Many of them produce a
staggering variety of colour forms -
Heliconius erato e.g. produces no less than 29 geographical
forms, each of which corresponds almost exactly in colour and
pattern to a "sister" subspecies of Heliconius
melpomene flying in the same area.
All Heliconius species have elongated
black wings, marked with simple but striking patterns usually
featuring streaks or patches of red and cream, or blue and cream. A
few, such as sara,
cydno have a metallic blue sheen over the basal area of both
wings. All are characterised by their delicate fluttering flight,
long straight antennae, and fondness for flowers.
There are 13
subspecies of cydno - distributed
variously from Mexico to
Colombia, Venezuela and Ecuador. In some subspecies such as
zelinde from Colombia the normally broad white band on the
forewing is reduced in size or sometimes split into 2 distinct
narrow bands resembling those of wallacei
and sara. In
hermogenes, also from Colombia, the band is broken up into a
series of widely scattered small white spots. Most of the other
races have a single broad white band as in
galanthus, but have varying amounts of white on the
Heliconius cydno galanthis is found
to Costa Rica.
The butterfly is found in forested
areas at altitudes between sea level and about 1600m.
To be completed.
butterflies are characterised by having a very delicate fluttering
flight, particularly when hovering around flowers. They commonly
nectar at Hamelia,
Lantana and Palicourea.
Unlike other butterflies,
Heliconius females feed on pollen as well
Studies of ethilla have shown that
females deprived of pollen can only produce about 15% of the number of
eggs laid by females that have access to it. This probably applies
equally to other Heliconius species
including melpomene. The pollen from
and Gurania flowers provides amino acids
that can't be obtained from nectar or other sources, and contributes
greatly to the longevity of the butterflies - some
Heliconius species are known to live for
up to 9 months as adults.
Studies have shown that
Heliconius butterflies have home ranges
within which they can memorise the locations of nectar and pollen
sources, host plants and communal roosting sites. They are able to
plan the most efficient route by which to visit all nectar / pollen
sources in the vicinity by using simple calculations akin to what
mathematicians call the "travelling salesman algorithm". Erlich &
Gilbert demonstrated that individual butterflies memorise the location
of particular Psiguria plants, which they
visit daily, following a predefined circuit through the forest.
In the genus Heliconius most species rely
entirely on airborne chemicals to locate mates. Males of
ismenius and cydno are attracted
by pheromones to the pupae of conspecific females. The day before
emergence a female pupa will usually have several males in close
attendance. A frantic battle takes place the instant she hatches, as
the males all struggle to copulate with her, not even allowing her
time to expand and dry her wings. In some other
Heliconius species such as
sara the males don't even wait until the female emerges.
Instead they physically break open her pupa and copulate as soon as
her genitalia are accessible.