Portunus ordwayi (Stimpson) 



Figure 148 



Achelous ordwayi Stimpson, 1860a, p. 224. 

 Portunus ordwayi: Hay and Shore, 1918, p. 431, pi. 33, fig. 

 Rathbun, 1930a, p. 71, pi. 33 (rev). 



6. 



FiGintE 148. — Portunus ordwayi (Stimpson). Male in 

 dorsal view, legs not shown except for right cheliped, 10 

 mm. indicated. 



Recognition characters. — Carapace approxi- 

 mately 1.5 times as wide as long, uneven, eleva- 

 tions granulate and depressions pubescent, with 

 a number of conspicuous, curving, transverse 

 ridges. Six frontal teeth including acuminate in- 

 ner orbitals; true frontal teeth about equal in 

 size, triangular, acute, middle pair advanced be- 

 yond others. Outer orbital tooth large; antero- 

 lateral teeth diminishing slightly in size from first 

 to seventh, inclusive, eighth about as long as space 

 occupied by two preceding teeth, tips of all acute 

 and turned forward. 



Chelipeds of moderate length ; merus with four 

 or five strong spines in front, a single distal one 

 behind; carpus ribbed and with strong internal 

 and much smaller external spine; hand ribbed on 

 all surfaces except flat, highly iridescent, superior 

 surface; superointernal ridge raised into a crest 

 terminating (list all v in a sharp spine. Margins of 

 carapace and rhelipeds more or less fringed witli 

 silky hairs. 



Mi -ii.tn n in i -nfs. — Carapace: male, length, 26 

 mm.; width, 42 mm. 



Color. — Carapace and legs reddish brown due 

 to fine mottling with red, yellowish brown, and 



gray; pale orange beneath, deeper orange on 

 chelipeds and legs; chelae deep red brown above, 

 fingers with two cross bands of light orange red. 

 Blue coloration also apparent near red and dark 

 pigments; hairs on appendages deep red (Abram- 

 owitz, 1935). 



Habitat. — This is another of the tropical swim- 

 ming crabs which move northward with warm 

 water currents; surface to 58 fathoms, rarely 

 deeper. 



Type localities. — Key Biscayne and Tortugas, 

 Fla.; St. Thomas, [V.I.]. 



Known range. — Vineyard Sound, Mass. ; North 

 Carolina through Gulf of Mexico, Caribbean Sea, 

 and West Indies to State of Bahia, Brazil ; Ber- 

 muda. 



Remarks. — Rathbun (1930a) listed an ovige- 

 rous female in March from Florida. 



Portunus depress if rorts (Stimpson) 



Figure 149 



Amphitrite deprcsifrons Stimpson, 1859, p. 58. 

 Portunus depressi/rons: Hay and Shore, 1918, p. 430, pi. 33, 

 fig. 7.— Rathbun, 1930a, p. 84, pi. 41 (rev.). 



Recognition characters. — Carapace approxi- 

 mately 1.6 times as wide as long, uneven, pubes- 

 cent, and with indistinct transverse ridges. Six 

 frontal teeth, including inner orbitals much larger 

 than others, tips of all teeth about on a line. Ex- 

 ternal orbital tooth strong, tip rounded; antero- 

 lateral teeth acute, turned forward, lateral tooth 

 scarcely longer than one in front, teeth and inter- 

 vals between them fringed with hairs. 



Chelipeds trigonal, serratogranulate and pubes- 

 cent; merus with five spines in front and a distal 

 one behind; carpus with two spines, outer much 

 smaller than inner one; hand short and com- 

 pressed, upper margin raised into a crest termi- 

 nating distally in a stout spine, a smaller spine at 

 carpal articulation; fingers flattened, dactyl with 

 border of hairs on superior margin. Walking legs 

 unusually long and slender, first pair with articles 

 fringed with hairs. Swimming legs shorter than 

 in most species of genus. 



Miiixiireincrit-s. Carapace: male, length, 26 

 mm.; width, 41 mm. 



Color. — Carapace in life irregularly mottled 

 witli light and dark gray, closely imitating colors 

 of sand; chelipeds and posterior legs similar, 

 though paler; first pair of walking legs bright 



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FISH AND WILDLIFE SERVICK 



