| Danaus chrysippus|
Danaus chrysippus, also known as the plain tiger or African monarch, is a medium-sized, butterfly widespread in Asia and Africa. It belongs to the Danainae ("Milkweed butterflies") subfamily of the brush-footed butterfly family, Nymphalidae. Its coloration is mimicked by multiple species.
The plain tiger can be considered the archetypical danaine of India. Accordingly, this species has been studied in greater detail than other members of its subfamily occurring in India.
The Danaus chrysippus is a medium-sized butterfly with a wingspan of about 7–8 centimetres (2.8–3.1 in). The body is black with many white spots. The wings are tawny, the upperside brighter and richer than the underside. The apical half of the forewing is black with a white band. The hindwing has three black spots around the center. The hindwing has a thin border of black enclosing a series of semicircular white spots.
Background color and extent of white on the forewings varies somewhat across the wide range; see Systematics and taxonomy below.
The male plain tiger is smaller than the female, but more brightly colored. In addition, male danaines have a number of secondary sexual characteristics. In the case of the plain tiger, these are:
- The male has a pouch on the hindwing. This spot is white with a thick black border and bulges slightly. It is a cluster of specialised scent scales used to attract females.
- The males possess two brush-like organs which can be pushed out of the tip of the abdomen.
Systematics and taxonomy
- Danaus chrysippus chrysippus
- Asia, Mediterranean region, northern tropical Africa
- Danaus chrysippus alcippus (Cramer, 1777) - formerly D. c. aegyptius
- From the Cape Verde Islands through tropical Africa to Yemen and Oman. Browner with broader white forewing spots.
- Danaus chrysippus orientis (Aurivillius, 1909) - formerly D. c. liboria
- Saint Helena, southern tropical Africa to South Africa, Madagascar, Comoros, Seychelles and Mascarenes. Small white forewing spots.
On the other hand, the former subspecies petilia is nowadays recognized as a good species, the Lesser Wanderer. More enigmatic is the status of the former subspecies (or forms) dorippus and bataviana. These are tentatively also regarded as a distinct species, the "dorippus tiger" (Danaus dorippus).
However, it appears (from analysis of mtDNA sequences, which are only inherited from the mother) that the dorippus tiger is the product of an ancient lineage of Danaus hybridizing with plain tiger females. As the plain tiger is known to be parasitized at least occasionally by Spiroplasma bacteria which selectively kill off male hosts, a subsequent scarcity of plain tiger males might have led to this hybridization and the evolution of the dorippus tiger. From the color pattern of this species, it can be assumed that the ancient lineage had no black apex on the forewings, as this character is still absent in D. dorippus.
The presumed subspecies cratippus most likely belongs to either the lesser wanderer or the dorippus tiger, but confirmation of its taxonomic status requires more research. In any case, these three species are closely related; their closest relatives, in turn, might be the soldier (D. eresimus) and queen (D. gilippus) butterflies.
Several local forms have been described from Asia:
- Danaus chrysippus chrysippus f. alcippoides
- The upper hindwing is more or less very white; about half of the individuals have a second submarginal spot in the forewing. Occasionally found in Southeast Asia, very rarely in India.
- Danaus chrysippus chrysippus f. gelderi
- The upper hindwing has white markings. Occasionally found on Sulawesi.
- Danaus chrysippus chrysippus f. bowringi
- The upper hindwing has a subapical band composed of somewhat larger spots, and an additional forewing spot as in f. alcippoides is always present. Found throughout the eastern parts of this subspecies' range.
On the other hand, the plethora of named taxa from Africa are apparently F1 or F2 hybrids between the plain tiger subspecies (the contact zone of which is in the general area of Uganda) and/or D. dorippus:
- Danaus chrysippus × alcippoides
- is D. c. chrysippus × D. c. alcippus
- Danaus × transiens, Danaus × klugii, Danaus × albinus and Danaus × semialbinus
- are D. c. alcippus × D. dorippus
It is found in many habitats including desert (pending availability of food) and right up into the mountains at altitudes up to 9,000 feet (2,700 m). It is primarily a butterfly of open country and gardens and unlike the related common tiger, is least common in damp, forested, hilly regions. It is a somewhat migratory species.
This butterfly is perhaps the most common of Indian butterflies and is a familiar sight on the subcontinent. It flies from dawn to dusk, frequenting gardens, sipping from flowers and, late in the day, fluttering low over bushes to find a resting place for the night.
As usual for diurnal butterflies, this species rests with its wings closed. When basking it sits close to the ground and spreads its wings with its back to the sun so that the wings are fully exposed to the sun's rays.
Defense against predators, mimicry
The plain tiger is protected from attacks due to the unpalatable alkaloids ingested during the larval stages. The butterfly therefore flies slowly and leisurely, generally close to the ground and in a straight line. This gives a would-be predator ample time to recognise and avoid attacking it. Inexperienced predators will try attacking it, but will learn soon enough to avoid this butterfly as the alkaloids in its body cause vomiting.
The butterfly also has a tough, leathery skin to survive such occasional attacks. When attacked it fakes death and oozes nauseating liquid which makes it smell and taste terrible. This encourages the predator to release the butterfly quickly. The plain tiger thus has the ability to recover "miraculously" from predator attacks that would kill most other butterflies.
The protection mechanisms of the plain tiger, as of the other danaines, and indeed of all colorful unpalatable butterflies, result in predators learning this memorable aspect at first hand. Predators soon associate the patterns and habits of such butterfly species with unpalatability to avoid hunting them in future. This advantage of protection has led to a number of edible butterfly species, referred to as "mimics", evolving to resemble inedible butterflies, which are referred to as the "model". The resemblance is not only in color, shapes, and markings, but also in behavioural and flight patterns. This form of mimicry—where an edible species mimics an inedible species—is known as Batesian mimicry.
The mimics can resemble the models very closely. In some cases, it requires examination in the hand and reference to field guides to tell them apart. The plain tiger is specifically mimicked by the following butterflies:
- Indian fritillary (Argyreus hyperbius) females
- Danaid eggfly (Hypolimnas misippus forma inaria) females
The following butterflies have a general resemblance to both the plain tiger and the common tiger:
- Leopard lacewing (Cethosia cyane) males and females
- Indian Tamil lacewing (Cethosia nietneri mahratta) males and females
- Common palmfly (Elymnias hypermnestra) females
The similarity between the plain and common tigers makes them Müllerian mimics, as the adverse experience a predator makes with either species will also protect the other.
The female plain tiger perches on the upperside of a leaf and, curling its abdomen around the edge, lays an egg on the underside. Only one egg is laid per leaf to avoid overcrowding of the caterpillars. The egg is silvery white, shiny, tall, bullet-shaped with an apical point and ribbed sides.
After the caterpillar hatches, its first meal is the eggshell itself. It lives its entire larval life on the lower side of the leaves. During the first few days it has a very interesting manner of feeding: It will take up a spot on the underside of the leaf and nip a complete circle around itself in the lower cuticle of the leaf. By doing this it stops the poisonous sap of its host plant from flowing into the area inside the circle. It then proceeds to eats the lower surface of this area, leaving the upper cuticle intact.
As it grows, it eats both the lower and upper cuticle of the circle thus leaving smallish circular holes in the leaves of its host plant. When its mandibles are large enough it eats the complete leaf by gnawing at the edges.
The caterpillar is uniformly cylindrical. Its body is covered with bands of black and white interspersed with thick, yellow, dorsolateral spots. The most striking characteristics are the three pairs of long and black tentacle-like appendages. The first pair is moveable and also the longest. The tentacles are present on the third, sixth and twelfth segments. The head is shiny, smooth and has alternating black and white semicircular bands. The legs and prolegs are black and the prolegs have white bands at their bases.
The pupa hangs freely from the support. It is widest at the seventh abdominal segment where it has a double chain of extremely tiny golden and black beads. There are tiny golden spots on the shoulders and wing-cases. The rest of the pupa is pale green with a smooth surface. The pupa is light pink when formed among dry or unnatural objects.
- Danaus chrysippus chrysippus mating in Hyderabad, India
- Egg at MNP, Mumbai
- Larvae of plain tiger eating its own eggshell
- Plain tiger caterpillar making "moat" to feed during the first instar
- Second instar
- Older caterpillar
- Fresh pupa at BKC, Mumbai
- Pink pupa due to pupation among inanimate objects
- A newly emerged plain tiger female in captivity
- Male D. c. chrysippus, recently emerged from chrysalis
Larval food plants
- Asclepias – milkweeds (recorded on A.cancellata, A. coarctata, A. curassavica, A. fulva, A. kaessneri, A. lineolata, A. physocarpa, A. reflexa, A. scabrifolia, A. semilunata, A. stenophylla, A. swynnertonii, A.syriaca)
- Aspidoglossum interruptum
- Calotropis – mudar (recorded on C. gigantea, C. procera)
- Caralluma burchardii (recorded from canary Islands/Spain)
- Ceropegia dichotoma (recorded from canary Islands/Spain)
- Cryptolepis buchananii
- Cynanchum (recorded on C. abyssinicum, C. acutum, C. altiscandens, C. amplexicaule, C. carnosum, C. floribundum, C. sublanceolatum)
- Gomphocarpus fruticosus
- Kanahia laniflora
- Leichardtia australis
- Leptadenia hastata
- Marsdenia leichhardtiana
- Metaplexis japonica
- Orbea variegata (recorded from canary Islands/Spain)
- Oxystelma pulchellum
- Pentatropis (recorded on P. atropurpurea, P. quinquepartita)
- Pergularia daemia
- Periploca linearifolia
- Pleurostelma cernuum
- Secamone (recorded on S. afzelii, S. parvifolia, S. platystigma
- Stapelia gigantea
- Stathmostelma (recorded on S. gigantiflorum, S. pedunculatum)
- Tylophora (recorded on T. stenoloba, T. sylvatica)
Host plants from other families include Dyerophytum indicum (Plumbaginaceae), Ficus (Moraceae; recorded on F. laevis, F. racemosa), Ipomoea (Convolvulaceae; recorded on I. alba, I. bona-nox), Lepisanthes rubiginosa (Sapindaceae) as well as some Euphorbiaceae, Malvaceae, Poaceae, Rosaceae and Scrophulariaceae.
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- List of butterflies of India
- List of butterflies of India (Nymphalidae)
- List of butterflies of India (Danainae)
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