| Physical description |
1 encoded moving image (8.23 min.) : sd., col. |
| Note |
Filmed at the Medical Research Council's Tsetse Research Laboratories, Langford, Bristol and at Kariba, Zimbabawe. |
| Credits |
Made by Wellcome Trust Film Unit -- written and narrated by Dr. L.G. Goodwin, F.R.S.; directed and photographed by Douglas Fisher. |
| Partial contents |
Segment 1 Close-up shots of the tsetse fly are seen. The commentary explains that adult flies measure from 6mm to 14mm in length and are found in habitats ranging from the rain forest to the dry savannah woodland. The species Glossina Morsitans occurs in the savannah woodlands at the end of the dry seasons; there is close-up footage of one lowering its proboscis into the skin of a man's hand. Glossina Morsitans feed on warthogs, antelopes and cattle; we see further shots of it feeding on its host, sucking up the host's blood, doubling the fly's own weight. The distinction between male and female tsetse is shown as is their mating process. A sex recognition pheromone is produced to assist mating and a male is shown attempting to mate with a decoy soaked in the pheromone solution. A detailed diagram showing the sexual organs of the female tsetse fly and the reproductive cycle is shown. The tsetse fly is unusual in that it produces only one larvae at a time. The larvae feed on milk produced by the uterine glands and moult twice as they grow, swelling to the size of the mother's abdomen. We see the mother fly give birth to the larvae, which comes out tail first. Time start:00:00:00:00 Time end: 00:04:38:11 Length: 00:04:38:11 |
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Segment 2 The larvae burrows itself head first into the soil. The buried larvae is shown in a time-lapse sequence pupating into a black puparium. An x-ray of it shows the two moults that take place in the pupae; the first producing the pupa, the second the imago. A man in woodland collects tsetse flies for laboratory work. We are shown in close-up how the imago breaks the anterior end of the puparium and struggles out underground, then crawls to the surface. A further time-lapse sequence shows the imago at rest while its wing veins fill with fluid, then dry out. The fly searches for a new host and the life cycle is complete. Time start: 00:04:38:11 Time end: 00:08:22:12 Length: 00:03:44:01 |
| Access |
Unrestricted |
| Summary |
The twenty-two species of blood-feeding tsetse fly are found only in tropical Africa - all can carry the trypanosome parasite that causes African sleeping sickness (African Trypanosomiasis) in man and Nagana in cattle and other domesticated animals.This film gives a detailed account of the life-cycle of the tsetse fly, with special reference to Glossina morsitans. The fly does not lay eggs but gives birth to one living larva at a time, which burrows into the earth and pupates. When the pupa hatches, the adult fly struggles to the surface and goes in search of its first blood meal. Each of these stages is shown in close-up detail. 2 segments. |
| Target audience |
General public |
| Language |
In English |
| Copyright |
Wellcome Trust 1987; 2008 |
| Topic-MESH |
Tsetse Flies -- growth & development.
|
|
Trypanosomiasis, African.
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| Place name |
Medical Research Council's Tsetse Research Laboratories, (Langford, Bristol, England)
|
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Medical Research Council's Tsetse Research Laboratories (Kariba, Zimbabawe)
|
| Genre/Technique |
Encoded moving images.
|
| System no. |
.b16658231
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