Research on the mosquitoes of Angola - Systematic Catalog of ...

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RIBgIRO, H. & RAMOS, H. Cunha -- <strong>Research</strong> on the mosquitoes of Angola X by C. tigripes, Ae. aegypti, C. p. pipiens, C. decens, C. trifilatus and C. pruina. 10 out of the 20 breeding sites with the associate tigripes were ground water, while other 6 consisted of artificial containers and 4 were rock-pools. From the above data concerning breeding of C. duttoni, it seems probable that this mosquito was once mainly a plant breeder and that, later, as it is usual in such cases, it was able to use rock-pools. From these, also as usual, artificial containers in peridomestic habitat could then be invaded, which seem to be now the most favoured kind of all the larval biotopes of duttoni, at least in Angola. At the same time, however, it seems that C. duttoni was also able to develope another trend for breeding in ground water which has also become an important breeding area for this mosquito. As the relative importance of these two kinds of breeding areas is reversed in the case of its redoubtable predator and main associate C. tigripes (see under 7.1.1), it would be interesting to ascertain the impcrtance of the selection pressure exerted by this predator on the development of the ability of C. duttoni for exploring peridomestic habitat. Fig. 9 illustrates a typical breeding site of C. duttoni. 7.5.9--Culex (CuIex) ethiopicus Edwards, 1912 New record for Angola. MATERIAL EXAMINED. All the following locality records for C. ethiopicus are based on the examination of laboratory reared adults: BERO RIVER (N. of Virei), 7 9, 12 /5 plus 7 larvae, 12.V.1969; CAINDE, 4 9, 2 /5, 16 larvae, same date; CALAI, 1 9, 2 /5, 4 larvae, 27.IV. 1966 and 24.V.1967; CARACULO. 8 2, 6 /5, 14.V. 1969; CHITADO, 1 /5, 21.II.1970; CUBAL, 4 9, 1 /5, 15.IX.1970; LAGOA DOS PARALELOS, I 9, 1 /5, 4 larvae, 7.V.1969; LUINGA, 1 /5, 1.X.1969; MACULAMA, 1 ,o, 5 larvae, 21.V.1969; MOnAMEDES, 4 9, 9 /5, 13 larvae, 20.X.1967 and 29.IV. 1969; MUNHINO, 4 9, I /5, 6 larvae, 7.V.1969. TAXONIOMIC NOTES. In our adult specimens of C. ethiopicus the pale apical bands on tergites are sometimes widened laterally, while in some of the specimens tergites vI-VIII are mostly pale. The colour of these pale markings on tergites varies in the Angolan material from pure white to yellow. The distinction between adult ethiopicus and Estud., Ens. e Doc. -- 134 79
RIBgIRO, H. & RAMOS, H. Cunha -- <strong>Research</strong> on the mosquitoes of Angola -- X the form of bilaeniorhynchus occurring in Africa (? domesticus) is given in the adult key. As stated by Hopkins (24), larvae of C. ethiopicus are indistin- guishable from those of C. bitaeniorhynchus, though both can usually be separated from larval annulioris. On the other side, all our ethiopicus and annulioris larvae are distinguishable from those of auran- tapex }injaensis by means of the chaetotaxy of abdominal segment viii (see larval key). DISTRIBUTION. Map 9 shows the known distribution of C. ethiopicus in Angola, mainly confined to the driest areas of the country (see also Maps 2 and 3). It is probable, however, that ethiopicus be a qdite generalized species and that several of our larval records of the group throughout Angola (Cariango, Dala Tando, Dinde, Dirico, Ebanga, Huambo, Hunguria, Lonjava and Quilengues) belong, in fact, to this species, namely those from the aridest of these areas. BIOEClOLOGICAL NOTES. All our adult specimens of C. ethiopicus were reared in the laboratory from larva or pupa. C. ethiopicus is a ground water breederø Twelve breedings places were recorded by the writers for this mosquito: 8 pools in river beds, 3 open ground pools and a small pond. The larval biotopes were always unshaded or scarcely shaded, usually with clean water and often without any vegetation. No filamentous green algae were recorded. The breeding 'wate,r wais ialways acid, With a pH, measured in 10 biotopes, varying from 5.3 to 6.7 (mean 6.2). The salt content (NaCl) of the water, also examined in 10 biotopes, was always low, ranging from 0.1 to 2.1 (mean 0.8) g/1. Seven Anophelines and four other Culicines were recorded in the ethiopicus breeding places. The species more often found as associates were: An. gambiae (7 biotopes), An. listeri and An. pretoriensis (6 each), C. simpsoni form A (4) and C. univittatus (3). Fig. 10 shows a typical ethiopicus breeding place. As no adults were ever found inside human habitations nor collectors were ever bitten when exposed near its prolific breeding places, it seems that C. ethiopicus is a zoophilic mosquito also in Angola. 80 Es,ud.. Etts. c Doc.- 134
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!NTA DE INVESTIOAQOE8 IENTIFICAS DO
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ESTUDOS, ENSAIOS E DOCUMENTOS N. ø
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VOLUMES J/ PUBLICADOS NA COLEC(3,O
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36--A Entomofauta dos Produtos Arma
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75 -- Notas sobre a Criaqo de Gado
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CDU 576.895.711 (673) JUNTA DE INVE
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I --INTRODUCTION With this paper on
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4--ON THE ZOOGEOGRAPHY OF ANGOLA On
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RSUM Dans ce travail, les auteurs f
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REFERENCES 1--ROQUE, A. B.--
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