Potamonautes raybouldi Cumberlidge & Vannini, 2004

Reed, Sadie K. & Cumberlidge, Neil, 2006, Brachyura: Potamoidea: Potamonautidae, Platythelphusidae, Deckeniidae (), Zootaxa 1262 (1), pp. 1-139: 1-139

publication ID

http://doi.org/ 10.11646/zootaxa.1262.1.1

persistent identifier

http://treatment.plazi.org/id/039E87EB-FF87-0354-7A69-EC8C327DFA8B

treatment provided by

Felipe

scientific name

Potamonautes raybouldi Cumberlidge & Vannini, 2004
status

 

11. Potamonautes raybouldi Cumberlidge & Vannini, 2004   (Figs. 104–112, 165–166, 183, plate XI)

Potamonautes raybouldi Cumberlidge & Vannini, 2004: 683–689   , Figs. 1–2.

Type material examined: TANZANIA: Adult male holotype (cw 55.7 mm) from waterfilled tree hole in forest 500 m asl, near Zigi , 9 km from Amani , East Usambara mountains , iv.1966 (J. N. Raybould) ( NMU KMH 11486 View Materials ); two adult male paratypes (cws 39.6, 40.5 mm) (from water­filled tree holes in forest 500 m asl, near Zigi, 9 km from Amani, East Usambara mountains , iv.1966 (J. N. Raybould) ( NMU TRW1966.A.2); East Usambara mountains near Zigi, 9 km from Amani, from water­filled tree holes in forest 500 m asl, subadult female (cw 36.9 mm), subadult male (cw 29.6 mm) vi.1966 (J. N. Raybould) ( NMU TRW1966.B.2); adult male (cw 46.5 mm), subadult female (cw 36.2 mm), in water­filled tree holes in forest near Amani, East Usambara mountains, iv.1966 (J. N. Raybould) ( NMU TRW1966.11)   .

Additional material. For a complete account of other material from Tanzania and Kenya, see Cumberlidge & Vannini (2004).

Diagnosis. Postfrontal crest sharp­edged, spanning entire carapace; exorbital tooth large, sharp, directed forward; epibranchial tooth reduced to small granule; anterolateral margin between exorbital, epibranchial teeth smooth; anterolateral margin posterior to epibranchial teeth raised, granulated, end curving inward over carapace surface; carapace highly arched (ch/fw 1.5–1.7); suborbital margin smooth raised; suborbital, subhepatic regions of carapace sidewalls with fields of large granules, pterygostomial region smooth; thoracic sternal sulcus s3/s4 complete, deep, v­shaped, not meeting anterior margin of sternoabdominal cavity; episternal sulci s4/e4, s5/e5, s6/e6 s7/e7 all complete; second carpal tooth of carpus of cheliped pointed, large, half size of first tooth, directed at 70°–90° angle to first tooth; tip of terminal article of gonopod 1 curving sharply upward; terminal article distinctly widened in middle by high medial fold; distal margin of subterminal segment concave, medial margin much wider than lateral margin, forming rounded medial shoul­ der; base of terminal article at dorsal membrane concave; dorsal membrane wide on lateral margin tapering to point at medial margin; inner outer surfaces of merus, carpus, of palm of propodus of cheliped all with conspicuous reticulated rust­red pattern over cream background.

Size. The size range of adult males and females begins at around cw 39 mm.

Type locality. Zigi , 9 km from Amani, East Usambara Mountains, Tanzania   .

Distribution. Kenya and Tanzania.

Remarks. Cumberlidge & Vannini (2004) provided detailed comparisons to other species of Potamonautes   , as well as notes on the distribution, natural history and color of the crab.

Natural history and conservation status. Potamonautes raybouldi   occurs in waterfilled tree holes in deciduous forests ( Bayliss 2002; Cumberlidge & Vannini 2004). Bayliss (2002) provided a detailed ecological study of the habitat of this species. A discussion of freshwater crabs that live in phytotelmic habitats is provided by Cumberlidge et al. (2005). The conservation status of P. raybouldi   is categorized as vulnerable (VU) ( Table 4) because it has a narrow range of occurrence and a restricted area of occupancy that are both below the thresholds for vulnerable (VU) ( IUCN 2004). It is difficult to estimate the population status and trends of this species but its population is estimated to be declining based on its specialized habitat requirements (water­filled tree holes) and on the increasing habitat disturbance from deforestation associated with growing human populations in the region.

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Potamonautidae

Genus

Potamonautes

Loc

Potamonautes raybouldi Cumberlidge & Vannini, 2004

Reed, Sadie K. & Cumberlidge, Neil 2006
2006
Loc

Potamonautes raybouldi

Cumberlidge, N. & Vannini, M. 2004: 689
2004