116 



N. CUMBERLIDGE 



widest at groove separating fourth, fifth segments. Sixth 

 segment, telson together forming near semicircle. 



Growth (Fig. 3 a,b, Table 1). Measurements and propor- 

 tions given in Table 1, Fig. 3 a,b. Sexual maturity judged by 

 development of female abdomen: abdomen of mature 

 females overlapping bases of coxae of walking legs, pleopods 

 broad, hair-fringed. Pubertal moult, from pubertal stage to 

 sexual maturity, occurring between CW 33-42 mm. Largest 

 known specimen, (male from Cameroon) CW 60.4, CL 39.9. 

 In Zaire, eggs produced in December; in Sudan, hatchlings 

 present in April. Dimensions of carapace varying with age 

 (Fig. 3 a). Relative proportions of carapace width (CW/CL) 

 and height (CH/CL) of juvenile and pubescent 5. flowed not 

 significantly different (P >0.05) from adults (Fig. 3 b). Front 

 width becoming smaller with age: FW/CL of adult S. flowed 

 significantly more narrow (P <0.001) than that of juvenile 

 and pubescent animals (Fig. 3 b). 



Colour. (Living adults from Ogoja, Nigeria). Dorsal cara- 

 pace dark purplish brown, with a contrasting yellow-orange 

 postfrontal crest and yellow orbital border. Flanks light 

 brown, third maxillipeds pale brown with purple tinge, eye- 

 stalks white cream, cornea black, sternum and abdomen light 

 brown with purple tinge. Arthrodial membranes between 

 joints of chelipeds and pereiopods dark brown; dorsal surface 



Table 1 Means (± SE) of ratio of carapace width (CW), carapace 

 height (CH), and front width (FW), to body size (CL) of adult 

 Sudanonautes flowed compared to the adults of six closely related 

 species of Sudanonautes from Nigeria and Central Africa. 



CW/CL 

 X±SE 



CH/CL 

 X±SE 



FW/CL 

 X±SE 



Sudanonautes flowed 1.52 ± 0.01 0.61 ± 0.0 10.38 ± 



0.003 



(n = 65) 

 Sudanonautes aubryi 1.37 a ± 0.01 0.52 a ± 0.01 0.38 ± 0.002 



(« = 63) 

 Sudanonautes africanus 1.38 a ± 0.01 0.43 a ± 0.003 0.36 c ± 0.004 



(n = 26) (n = 14) (n = 15) 



Sudanonautes granulatus 1.42 a ± 0.01 0.51" ± 0.01 0.41 a ± 0.01 



(n = 33) 

 Sudanonautes monodi 1.49 a ± 0.01 0.58 b ± 0.004 0.39 ± 0.004 



(n = 23) 

 Sudanonautes kagoroensis 1.52 ± 0.02 0.50 a ± 0.01 0.39 ± 0.004 



(n = 9) 

 Sudanonautes orthostylis 1.45 a ± 0.02 0.51 a ± 0.01 0.46 a ± 0.01 



(n = 10) 



Proportion significantly different from that of S. flowed: a = P 

 <0.001; b = P <0.01; c = P <0.05. 



01 



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70 

 65 

 60 

 55 

 50 

 45 

 40 

 35 

 30 

 25 

 20 

 15 

 10 

 5 





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10 15 20 25 30 35 40 45 

 Carapace Length (mm) 



10 15 20 25 30 35 40 45 

 Carapace Length (mm) 



Fig. 3. Comparisons of 108 specimens of Sudanonautes flowed, a, dimensions of the carapace (CW, CH, FW) compared to body size (CL), r 

 values (all at df = 107) indicate a highly significant correlation (P <0.001) between size classes, b, relative proportions of carapace width 

 and height (CW/CL, CH/CL) compared to body size (CL), r values (both at df = 107) indicate no significant correlation (P >0.05) between 

 size classes; relative proportions of front width (FW/CL) compared to body size (CL), r value (at df = 107) indicates a highly significant 

 correlation (P <0.001) between size classes. 



