Agabus ruwenzoricus Guignot, 1936
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https://dx.doi.org/10.3897/zookeys.963.53470 |
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lsid:zoobank.org:pub:9636C9F2-C6BD-4B34-BCC6-ED214C7B0D19 |
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https://treatment.plazi.org/id/2D56F90E-7240-520C-90A6-666B313140D3 |
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scientific name |
Agabus ruwenzoricus Guignot, 1936 |
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Agabus ruwenzoricus Guignot, 1936 Figures 1 View Figure 1 , 4B View Figure 4 , 8C View Figure 8 , 11C View Figure 11 , 11H View Figure 11 , 12 View Figure 12 , 13 View Figure 13 , 14 View Figure 14 , 15 View Figure 15
Agabus (Agabinectes) pallidus var. ruwenzoricus Guignot, 1936: 49
Type locality.
"Uganda. Mons Ruwenzori, versant est, 3.000 à 4.000 m." [Uganda, Mount Ruwenzori, eastern slope, 3000 to 4000 m].
Type material.
[Not examined]: Information about type specimens from Nilsson (1992a): "Lectotype here designated in NMNH (coll. Guignot) labelled: 'Monts Ruwenzori versant est zone alpine 3000 4000 m Ch. Alluaud I 1909', '3000 m’, ‘♂’, and my lectotype label; paralectotype ♂ with same original labels and my paralectotype label.".
Diagnosis.
Most similar to A. pallidus and A. raffrayi but separated from these taxa by the presence of distinct interocular spots on head (compare Fig. 4B and D View Figure 4 ). The metasternal wing is rather narrow; the WC/WS frequency distribution being intermediate between A. pallidus and A. raffrayi , but most similar to A. pallidus (see Table 1 View Table 1 , Fig. 12 View Figure 12 ). The aedeagus has an extended portion between the subapical broadening and the apical teeth, and the pronotal hypomeron is not visible in lateral view.
Description.
Habitus as in Fig. 11C, H View Figure 11 .
Colour: Head black with rufous anterior area; rufous interocular spots present. Pronotum black with minute to well-defined rufous margin. Elytra ferrugineous to rufopiceous. Ventral surface black, hypomeron rufotestaceous to rufous and epipleuron testaceous to rufotestaceous. Legs rufous to black. Antennae and palpi testaceous.
Microreticulation : Medium impressed on head, pronotum and elytra, and rather similar in both sexes. Composed of a mixture of small and somewhat larger, uneven meshes.
Structural features : Body length: 7.36-8.08 mm (see Table 1 View Table 1 ). Hypomeron not visible in strict lateral view (as in Fig. 10C, D View Figure 10 , compare with 10A, B), lateral bead of pronotum narrow and well defined. Metasternal wing narrow, WC/WS 3.0 or more in most specimens (see Table 1 View Table 1 , Fig. 12 View Figure 12 ). Pronotum broad, more than twice as broad as interocular distance (see Table 1 View Table 1 , Fig. 13 View Figure 13 ).
Legs: Protarsal claws long,> 1.6 × as long as protarsomere 4 in most specimens (see Table 2 View Table 2 , Fig. 14 View Figure 14 ). Metatarsomeres short and broad; metatarsomere 2 <1.8 × as long as broad (see Table 2 View Table 2 ), metatarsomere 5 <3.3 × as long as broad (see Table 2 View Table 2 ).
Male genitalia: Subapically broadened and prolonged between the subapical broadening and the apical and subapical teeth (Fig. 8C View Figure 8 ). Subapical tooth with varying appearance (similar to magnitude in variation seen in Fig. 5A-C View Figure 5 ).
Female: Externally similar to males.
Distribution.
Kenya, Rwanda, Uganda and the Democratic Republic of the Congo. Nilsson (1992a) and Omer-Cooper (1965) also give South Africa and Zimbabwe but these records are likely to belong to other species (see below).
Habitat.
Most records are from small mountain streams and rivers at elevations of 1900 to 3100 m, but it has also been found in stagnant waterbodies ( Nilsson 1992a). We found the species in a very small cold-water forest stream at an elevation of 1900 m in the Taita Hills, Kenya (Fig. 15 View Figure 15 ).
Etymology.
The name refers to the locality where the species was first collected, Mount Ruwenzori.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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