Typoderus canthus, Grebennikov, 2021

Grebennikov, Vasily V., 2021, Sky islands of the Cameroon Volcanic Line support the westernmost clade of five new Typoderus weevils (Coleoptera: Curculionidae: Molytinae), Arthropod Systematics & Phylogeny 79, pp. 57-74 : 57

4.2.3. Typoderus canthus sp. nov. Figs 1 , 2 , 3 , 4 , 6A-H.

Species diagnosis and description.

Holotype male (Figs 6A-H ), length between anterior edge of pronotum and elytral apex 5.1 mm; DNA barcode: MH917899. Diagnostic combination of morphological characters as in Table 4 . Sister clade to T. telamon sp. nov. (Fig. 3 ).

Material examined.

Holotype male (CNC): " CAMEROON, Mt. Oku , 6.2337 10.4980, 2090m, 26.xi.2014, sift36, local collector", “CNCCOLVG00008376” . Paratypes (CNC): 1, as in Fig. 3 ; specimen 8343: " CAMEROON, Mt. Oku , 6.2216 10.5063, 2273m, 23.xi.2014, sift34, local collector" .

Distribution.

Known only from Mt. Oku in Cameroon, in sympatry with T. amphion sp. nov. Elevation: 2,090-2,273 m.

Etymology.

Canthus, from ancient Greek mythology, one of the Argonauts, killed by a shepherd in Libya; noun in apposition.

Figures

Figure 1. Distribution of the genus Typoderus. Map designed using the online SimpleMappr tool (Shorthouse 2010).

Figure 2. Neighbour Joining clustering of 20 DNA barcodes of Cameroonian Typoderus (analysis A 1). Terminal names consist of BOLD sample ID (its last four digits correspond to specimen number), litter sifting sample number (Table 1), length of the DNA barcode (number of ambiguous nucleotides is in square brackets), BIN three-letter four-digit number and GenBank accession number. Names next to clusters are those of the new species described in section 4.2. HT denote holotypes.

Figure 3. Maximum Likelihood inference phylogram of Typoderus weevils rooted on Lupangus (analysis A 3, root is not shown). Cameroonian species form a clade. Digits at internodes are bootstrap values of 50 % and above. Non-Cameroonian (= Tanzanian) terminals are collapsed in species. Terminal names consist of specimen number (Table 3) and sifting sample number (Table 1). Habitus images are to scale; their numbers indicate exact Cameroonian specimens imaged. Names next to clades are those of the new species described in section 4.2.

Figure 4. Maximum clade credibility Cameroonian Typoderus tree with median ages derived from the BEAST analysis A 4. The 95 % credibility interval for each node is given with a horizontal bar. Digits at nodes are million years before present. Terminal names consist of specimen number (Table 3), GenBank accession number and sifting sample number (Table 1). Names next to clades are those of the new species described in section 4.2.

Figure 6. Male holotype of T. canthus sp. nov., habitus (A: dorsal, B: left lateral, C: ventral, D: left fronto-lateral), aedeagus (E: dorsal, F: ventral, G: right lateral) and H: sternite 9.