POTAMONAUTINI ( BOTT, 1970 )

Cumberlidge, Neil & Daniels, Savel R., 2022, A new multilocus phylogeny reveals overlooked diversity in African freshwater crabs (Brachyura: Potamoidea): a major revision with new higher taxa and genera, Zoological Journal of the Linnean Society 194 (4), pp. 1268-1311 : 1293

POTAMONAUTINI ( BOTT, 1970) TRIB. NOV.

( FIGS 1B 3 , 5D–L , 6A–F , 8D , 10A–E; TABLES 1–3)

Zoobank registration: urn:lsid:zoobank.org:act:836CD5A5-4950-4264-9859-7D4EB9C49B2C .

Diagnosis: Outer margins of the anterior thoracic sternum S4 low.

Etymology: Potamonautini is derived from the family level name Potamonautidae Bott, 1970 .

Type genus: Potamonautes MacLeay, 1838 .

Genera included: Arcopotamonautes ( Bott, 1955) stat. nov., Lirrangopotamonautes ( Bott, 1955) stat. nov., Platythelphusa A. Milne-Edwards, 1887 , Potamonautes MacLeay, 1838 s.s. and Rotundopotamonautes ( Bott, 1955) stat. nov.

Distribution: Potamonautini is widely distributed in sub-Saharan Africa in eastern and northern Africa ( Tanzania, Kenya, South Sudan, Sudan, Egypt, Somalia) and southern Africa ( Angola, Malawi, Mozambique, Zambia, Zimbabwe, Botswana, Namibia, South Africa, Eswatini and Lesotho) ( Fig. 8D ). This tribe is not found in West Africa (from Senegal to Nigeria).

Remarks: Potamonautini includes five genera and 101 species that form a well-supported and highly diverse group in the present study ( Fig. 1B 3 ), as well as in the most recent molecular studies of this fauna ( Daniels & Klaus, 2018: fig. 1; Wood et al., 2019: fig. 1).

Figures

Figure 1. A, maximum clade credibility tree of the Afrotropical freshwater crab fauna based on four DNA loci with support values (posterior probabilities and bootstrap values of the ML analyses) with a geological timescale below the tree topology. Posterior probabilities> 0.95 pP (*above branch) and bootstrap values> 75% (* below branch) were regarded as statistically supported and are shown on the tree topology. Clade A, Liberonautinae, clade B, Potamonautinae, clade B1, Maritimonautini, clade B2, Erimetopini, clade B3, Potamonautini. B, detail of the maximum clade credibility tree of the Afrotropical freshwater crab fauna showing Clade B3 Potamonautini with the species included in the five genera within the tribe: Arcopotamonautes (B3[1]), Lirrangopotamonautes (B3[2]), Platythelphusa (B3[3]), Potamonautes s.s. (B3[4]) and Rotundopotamonautes (B3[5]).

Figure 3. Gonopods 1 and 2 of four genera in Liberonautinae. A–C, Buea asylos (Cumberlidge et al., 2019: fig. 7a, d; 8a); D–F, Potamonemus mambilorum (Cumberlidge et al., 2019: fig. 7b, e; 8b); G–I, Sudanonautes floweri; J–L, Louisea balssi (Mvogo Ndongo et al., 2018: fig. 5a–c, © Magnolia Press, reproduced with permission from the copyright holder). A, D, G, J, left G1 ventral view; B, E, H, K, left G1 dorsal view; C, F, I, L, left G2 ventral view. Scale bar: A, B, D, E, G, H, J, K = 2.0 mm, C, F, I, L = 1.8 mm.

Figure 5. Gonopods 1 and 2 of one genus in Maritimonautini and three genera in Potamonautini. A–C, Maritimonautes obesus; D–F, Arcopotamonautes suprasulcatus; G–I, Lirrangopotamonautes dybowskii; J–L, Platythelphusa armata. Scale bar: A, B, G–L = 2.0 mm, C, F = 1.8 mm; D, E = 5.0 mm; L = 6.7 mm.

Figure 6. Gonopods 1 and 2 of two genera in Potamonautini. A–C, Potamonautes anchetiae (CAW 450A), Angola. A, D, left G1 ventral view. D–F, Rotundopotamonautes loveni, Kenya, B, E, left G1 dorsal view; C, F, left G2 ventral view. Scale bar: A, B, D, E = 2.0 mm, C, F = 1.8 mm.

Figure 8. Maps showing the distributional ranges of (A) Potamonautinae, (B) Maritimonautini, (C) Erimetopini and (D) Potamonautini.

Figure 10. Maps showing the distributional ranges of the five genera of Potamonautini. (A) Arcopotamonautes, (B) Lirrangopotamonautes, (C) Platythelphusa, (D) Potamonautes s.s. and (E) Rotundopotamonautes.