Riberazantaena grebennikovi, Bilton, 2021

Bilton, David T., 2021, Riberazantaena, a new hydraenid genus from the Eastern Arc Mountains of Tanzania (Coleoptera, Hydraenidae), Zootaxa 4999 (6), pp. 573-581: 577-578

publication ID

https://doi.org/10.11646/zootaxa.4999.6.4

publication LSID

lsid:zoobank.org:pub:CE3DB2D1-D2B7-4A6F-854B-A6710E3DEE46

persistent identifier

http://treatment.plazi.org/id/0385A42B-FFA8-FFBD-36AC-F91E2907FE99

treatment provided by

Plazi

scientific name

Riberazantaena grebennikovi
status

comb. nov.

Riberazantaena grebennikovi   comb. nov.

( Figs. 1A View FIGURE 1 , 2C View FIGURE 2 , 3 View FIGURE 3 & 4B View FIGURE 4 )

Protozantaena grebennikovi Perkins, 2009: 47   View Cited Treatment .

Material examined: 4♂, 2♀ “ TANZANIA, Uluguru Mts. // at Tchenzema vil.// S07°07’19” E037°37’16”,// 7.xi.2010, 2429m,// sifting09, V.Grebennikov ” GoogleMaps   ; 3♂ “ TANZANIA, W. Usamba-// ra Mts., Mazumbai For.,// S4.82634° E38.49690°,// 1860m, 12.i.2013, sift46,// V.Grebennikov ” GoogleMaps   ; 3♂ “ TANZANIA, Rubeho Mts. // at Ipondelo vil.// 6°50’20”S 36°34’32”E,// 21.xii.2011, 1875m,// sift.10, V.Grebennikov ” ( CBP, CNC, NMW) GoogleMaps  

Variation and biogeography. Populations of these beetles have been sampled from three separate mountain forests in the Eastern Arcs: West Usambara Mountains, Uluguru Mountains and Rubeho Mountains ( Fig. 4B View FIGURE 4 ). The first two of these also provided specimens included by Perkins (2009) in the type series. Whilst there are some differences between individuals from these populations in the shape of the apical expansion of the main piece (see Fig. 3 View FIGURE 3 ), this character is also somewhat variable within a single sample, and not consistently diagnostic. Externally, beetles from these different forests do not differ consistently either. Despite this, the late Ignacio Ribera (pers. comm.), noted significant mitochondrial COI divergence between populations, suggesting relatively long-term isolation in montane forest ‘islands’. This isolation does not appear to have resulted in significant fixation of divergent morphological characters, however, and so I retain populations from all three mountain systems within R. grebennikovi   . Grebennikov (2019) describes a remarkably similar situation in some Eastern Arc Afrocloetus Petrovitz, 1968   pill scarabs, in which distinct, allopatric mitochondrial clades are in some cases morphologically identical. It is interest- ing to note that there is much greater geographical distance between populations of R. grebennikovi   than between the northernmost populations of this species and R. latissima   sp. nov. in the South Pare Mountains. All specimens examined were micropterous, in contrast to the observations of Perkins (2009).

Differential diagnosis. For characters allowing separation from Riberazantana latissima   sp. nov., see under that species below.

CNC

Canadian National Collection of Insects, Arachnids, and Nematodes

NMW

Naturhistorisches Museum, Wien

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Hydraenidae

Genus

Riberazantaena

Loc

Riberazantaena grebennikovi

Bilton, David T. 2021
2021
Loc

Protozantaena grebennikovi

Perkins, P. D. 2009: 47
2009