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

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RIBEIRO, H. & RAMOS, H. Cunha -- <strong>Research</strong> on the mosquitoes of Angola X BIOEOOLOGICAL NOTES. Seven larval biotopes were recorded for invidiosus s.s.: margins of slow flowing rivers (3), rock-pools (2), a small ditch and a cement tank. The breeding water was usually clean, sometimes with abundant aquatic vegetation. Larvae of C. tigripes were found as associates in two biotopes and C. annulioris, C. alecerts, C. duttoni, C. perfidiosus and C. telesilla were recorded once. Fig. 12 ilustrates a breeding place of C. invidiosus (typical form). In that concerns adults, invidiosus s.s. was never seen biting and only one male was caught resting indoors, which seems to point to the zoophily (and exophily) of this mosquito. According to Someren et al. (49), C. invidiosus (s. l.) may bite man rarely. 7.5.14--Culex (Culex) invidiosus var. vexillatus Edwards, 1941 The only published Angolan records of var. vexillatus are those from Lobito, by Worth & Paterson 02) and by Ribelto & Mexia (34). MATERIAL EXAMINED. CABINDA, 1 /t, 7 larvae, 26.VIII. 1970; L.iN- DANA, 2 $, 3 /t plus 3 larvae, 24.VIII. 1970. TAXONOMIC NOTES. The male terminalia from Cabinda and Lfindana, here attributed to the form vexillatus, differ from those of the type form as follows: f more expanded and assymmetrically so, somewhat like a flag, and d and d' slightly flattened and delicately striated. Ap- pendage e is a relatively narrow, obviously striated foliole, much like that of the type form. The taxonomy of C. invidiosus s. l. and its allied forms is far from being in a satisfactory state. The examination of male terrainalia of C. invidiosus Theo. enabled Edwards (8) to describe var. vexillatus from Kampala (Uganda) and to establish for this form a distribution (op. cit., p. 339) strictly within the West African Subregion of Chapin (63), includ- ing Stanleyville (now Kisangani) and Ibadan (Southern Nigeria). At the same time, however, Edwards (op. cit., p. 338) recorded males of the type form from a larger area within Tropical Africa which included also Kampala and Southern Nigeria (Lagos). The sympatry of both the type form and var. vexillatus being not compatible with a subspecific status, the question remains if var. vexillatus must be trated as a synonym of Estud., Ens. e Dot'.- 134 85
RIBgIRO, H. & RAMOS, H. Cunha -- <strong>Research</strong> on the mosquitoes of Angola X invidiosus or as a distinct, closely allied species. And if one considers both the kind and degree of the differences between both forms and the existence of intermediate stages of development of seta f, we would be inclined to the first hypothesis. This seemed to be, in fact, the decision implicitly favoured by De Meillon & Lavoipierre (32) when these Authors described, in 1944, the form vicinalis from Yangambi (near Stanleyville - Kisangani) as a subspecies of invidiosus. However, as the type form was recorded by Edwards also from this area (Stanleyville), the taxonomic difficulties arise now with the subspecific treatment of vicinalis. On the other hand, vicinalis being a member of series decens, we cannot be but reluctant as to accept such a subspecies differing so drastically from the rioruminate one in the number and shape of the coxite lobe appendages. Finally, the situation becomes even more delicate if we consider the previous description by Edwards (op. cit., p. 340), also from Stanleyville, of a male termina2ia quite similar to that of vicinalis. Thus, the areas of Yangambi- Stanleyville (Zaire), Kampala (Uganda), Ibadan-Lagos (Southern Nigeria) and, now, that of Banana-Cabinda (Congo River mouth) are the key-areas for a taxonomic analysis of C. invidiosus and its closest allied forms. According to the distributional and morphological data available and in the absence of mating experiments, the suggestion of the present writers is that var. vexillatus be treated as a junior synonim of invidiosus and that a specific rank be given both to vicinalis and to the form described by Edwards (op. cit., p. 340 and Fig. 118 g) as which in his own opinion (p. 340). In the writers' views, the affinities of the different forms (species) within series decens of Edwards would be better established by grouping them according to the number of appendages in the coxite lobe: group decens/invidiosus/ornatothoracis/trifoliatus, with d, d', e and f; group perfidiosus/perfuscus, with d, e and f; group of Edwards/vicinalis, with only e and f. The range of variation in terminalic and external morphology characters within each of these smaller groups is yet in need of extended research efforts. DISTRIBUTION AND BIOEOOLOGICAL NOTES. Map 16 shows the known distribution of var. vexillatus in Angola. 86 Estud., Ens. e 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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REFERENCES 1--ROQUE, A. B.--
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