WILLIAMS: CRABS OF THE GENUS CALLINECTES 



12'. Lateral spine almost always three or more times length of preceding anterolateral tooth; 



at least second to fifth anterolateral teeth with tips in a nearly straight line; males 



with distal portion of first gonopods S-curved (Atlantic; West Africa) gladiator. 



13. First gonopods of mature males with subterminal dorsal setae never more than four in 



number, often inconspicuous or missing (Atlantic; Caribbean-South America) danae. 



13'. First gonopods of mature males with subterminal dorsal row of setae numbering more 



than four (Pacific; Southern California-Peru; Galapagos Islands) arcuatus. 



KEY TO MATURE OR NEARLY MATURE MALE CALLINECTES BASED 



PRIMARILY ON FIRST GONOPODS 



Figures 18-21 



1. Tips of gonopods falling well short of suture between thoracic sternite VI and mesially 



expanded sternite VII 2 



1'. Gonopods reaching to, almost to, or beyond suture between thoracic sternite VI and 



mesially expanded sternite VII 5 



2. Gonopods well separated from each other, never touching or crossed 3 



2'. Gonopods overlapping each other, often crossed 4 



3. Gonopods slender distally, nearly straight, tips bent slightly mesad (Atlantic; United 



States-Gulf of Mexico) similis. 



3' . Gonopods fairly stout distally, angled toward midline, then abruptly bent forward in a 

 short slender terminal extension (Atlantic; Bermuda-Florida-South America-West 

 Africa) marginatus. 



4. Tips of gonopods lanceolate, continuing in line with shaft, portion proximal to tip armed 



with short backward pointing spines quite visible at low magnification (Atlantic; 



Bermuda-North America-South America) ornatus. 



4'. Tips of gonopods not lanceolate, curved mesad, spines on S-curved shank exceedingly 



small at low magnification (Atlantic; West Africa) gladiator. 



5. Tips of gonopods curved abruptly mesad (Atlantic; Caribbean- South America) .... exasperatus. 

 5'. Tips of gonopods not curved abruptly mesad 6 



6. Slender portion of gonopods almost straight, minutely spined (under magnification), tips 



almost always bent ventrolaterally, never extending beyond abdominal locking 



tubercle on thoracic sternite V 7 



6'. Slender portion of gonopods definitely curved or sinuous, variously spined, tips never 



bent ventrolaterally 8 



7. Gonopods with subterminal dorsal setae never more than four in number, often incon- 



spicuous or missing (Atlantic; Caribbean- South America) danae. 



T . Gonopods with subterminal dorsal row of setae numbering more than four (Pacific; 



Southern California-Peru; Galapagos Islands ) arcuatus. 



8. Tips of gonopods reaching well beyond abdominal locking tubercle on thoracic sternite V 9 

 8'. Tips of gonopods not reaching beyond abdotninal locking tubercle on thoracic sternite V 



(Pacific; Baja California and Golfo de California) bellicosus 



9. Slender portion of gonopods with spinules small under magnification and most dense 



near middle, absent near tip (Pacific; Baja California-Juan Fernandez) toxotes. 



9'. Slender portion of gonopods with spinules readily visible at low magnification and 



distributed to tip 10 



10. Gonopodal spines arranged in a broad dorsolateral band 11 



10'. Gonopodal spines arranged in a single, rather uneven dorsolateral row (a few tiny spines 



lying outside row) (Atlantic; Western Hemisphere, introduced in Europe) sapidus. 



11. Tips of all frontal teeth reaching same level 12 



11'. Submesial pair of frontal teeth definitely shorter than lateral pair (Atlantic; West Africa) latimanus. 



721 



