DECKENIIDAE ORTMANN, 1897
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publication ID |
https://doi.org/ 10.1093/zoolinnean/zlab082 |
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publication LSID |
lsid:zoobank.org:pub:A4C99333-FF4C-4857-9900-E3D743E03684 |
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DOI |
https://doi.org/10.5281/zenodo.6461538 |
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persistent identifier |
https://treatment.plazi.org/id/7A4187EF-4F32-FFA1-076D-FCBBFEF852D3 |
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treatment provided by |
Plazi |
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scientific name |
DECKENIIDAE ORTMANN, 1897 |
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FAMILY DECKENIIDAE ORTMANN, 1897 View in CoL
( FIGS 1 View Figure 1 , 11A–C; TABLES View Figure 11 1–3)
Diagnosis: Deckeniidae taxa are recognized by characters of the second gonopod (G2). When the G2 is viewed in cross section the dorsal side of the SA-TA junction has a setose spoon-like structure. When the G2 TA is viewed in cross section the dorsal margin is either lacking or it is extremely reduced. The G2 TA is long and flagellum-like, with a ventral margin that is folded to create a tube, but the degree of folding varies from completely open ( Afrithelphusa ), to partly closed ( Seychellum ), to almost closed ( Hydrothelphusa , Malagasya and Madagapotamon ). For Deckeniiidae taxa the G2 TA flagellum is never a completely closed tube as in Potamon ( Klaus et al., 2006) .
Type genus: Deckenia Hilgendorf, 1869 , by original designation.
Genera included: Afrithelphusa Bott, 1969 , Agora Cumberlidge, Soma, Leever & Daniels, 2020 , Boreathelphusa ( Cumberlidge & von Sternberg, 2002) , Deckenia Hilgendorf, 1869 , Foza Reed & Cumberlidge, 2006b , Glabrithelphusa Meyer et al., 2014 , Globonautes Bott, 1959 , Hydrothelphusa A. Milne-Edwards, 1872 , Madagapotamon Bott, 1965 , Malagasya Cumberlidge & von Sternberg, 2002 , Marojejy Cumberlidge, Boyko & Harvey, 2002 , Seychellum Ng et al., 1995 and Skelosophusa Ng & Takeda, 1994 .
Distribution: Deckeniidae taxa are found in West Africa ( Liberia, Guinea, Sierra Leone), East Africa ( Tanzania, Kenya, Somalia), the granitic Seychelles and Madagascar (Cumberlidge, 1999; Cumberlidge et al., 2004; Reed & Cumberlidge, 2006a, b; Fig. 11A–C View Figure 11 ).
Remarks: The Afrotropical freshwater crabs form a well-supported monophyletic group with two distinct lineages ( Daniels et al., 2006, 2015) that are here recognized as two families, namely Potamonautidae and Deckeniidae ( Tables 1–3 View Table 1 View Table 2 View Table 3 ), rather than two subfamilies (Cumberlidge et al., 2008). The revised Potamonautidae has two phylogenetic divisions (subfamilies): Potamonautinae ( Tables 2 View Table 2 , 3 View Table 3 ) from sub- Saharan Africa, except West Africa ( Fig. 8A View Figure 8 ) and the new subfamily Liberonautinae ( Fig. 7B View Figure 7 ) from West and Central Africa. The revised Deckeniidae has two lineages (subfamilies): Deckeniinae (type genus: Deckenia ) ( Tables 2 View Table 2 , 3 View Table 3 ) from West Africa, East Africa and the Seychelles, formerly Deckeniini (Cumberlidge et al., 2008; Fig. 11B View Figure 11 ), and Hydrothelphusinae (type genus: Hydrothelphusa A. Milne-Edwards, 1872 ) from Madagascar, formerly Hydrothelphusini ( Cumberlidge & von Sternberg, 2002; Cumberlidge et al., 2008; Cumberlidge, 2021; Fig. 11C View Figure 11 ).
Earlier authors ( Bott, 1955; Martin & Davis, 2001) recognized the family Deckeniidae for one genus ( Deckenia ) with two species ( Deckenia imitatrix and Deckenia mitis ), which was included in the African Potamonautidae . Later, Klaus et al. (2006) expanded Deckeniidae to include six genera assigned to three subfamilies: Deckeniinae ( Deckenia , Seychellum ), Globonautinae ( Afrithelphusa , Globonautes ) and Hydrothelphusinae (Hydrothephus, Madagapotamon ), which they assigned to the Asian superfamily Gecarcinucoidea .
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