Arthroleptis adelphus (Perret, 1966)

Figure 4A

Material. ANGOLA – Cabinda Province • Mayombe NP, Miconge; –4.4860, 12.8780; 377 m a.s.l.; FKH 1255; GenBank: PQ455662 .

Identification. A medium-sized Arthroleptis (SVL = 30−33.6 mm, Zimkus and Blackburn 2008). The individual could not be clearly assigned to any species by morphology alone. Therefore, the species was identified genetically, being identical or almost identical (0.6% 16S p -distance) to material from Minkébé, Gabon (GenBank: KX289618) and Lekoumou, Republic of the Congo (GenBank: KY080052). Deichmann et al. (2017) found two different lineages that include material from Cameroon (near the type locality), suggesting that A. adelphus might represent a species complex which needs further investigation.

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Biology and distribution. The species is widely distributed in the Gulf of Guinea, from Nigeria to the Republic of the Congo (Nneji et al. 2019; Sánchez-Vialas et al. 2020). This represents the species’ southernmost record, and the first for Angola (Baptista 2024). As with the other members of the genus, A. adelphus is usually found moving among leaf litter (Zimkus and Blackburn 2008). The only specimen recovered was found foraging among leaf litter at night in the dry season, and in sympatry with the much more common and closely-related species, A. aff. poecilonotus .