PORTUNIDAE — STEPHENSON, WILLIAMS, LANCE 



21 



Table 1. — Features used in distinguishing species (designed to give positive or 

 negative answers; initially intended to cover the western American species of 

 Portunus; the list has been expanded to cover the species of Callinectes) 



Third 



maxilliped 



Carapace 



Body region Morphological features 



Front and Four frontal lobes or teeth 



orbital region Frontal processes rounded lobes, not pointed teeth 

 Median frontal lobes more protruding than lateral 

 Inner supraorbital angle subdivided (or almost) into 



two 

 Inner supraorbital angle not acute 

 Inner supraorbital sinus open 

 Outer supraorbital sinus open 

 Suborbital sinus open 



Anteroexternal angle of merus not expanded 



Generally hairy 



Normally covered with pile of hairs 



Narrow 



Without tubercular elevations 



Postlateral junctions not spinous 



Protogastric areas with granular patches 

 Mesogastric with broad granular ridge 

 Central gastric patch joining meso- and metagastrics 

 Metagastrics a pair of short ridges 

 Epibranchial ridges well developed 

 Anterolateral granular patches present 

 Anterior mesobranchial area bearing "almost a ridge" 

 Posterior mesobranchial ridge present 

 Cardiac area with narrow, prominent, separate ridges 

 Lateral postcardiac areas with granular patches 

 Median postcardiac area with granular patches (often 

 inconspicuous) 



Anterolateral First stouter than second 

 teeth With a hint of being alternately large and small 



Last tooth distinctly long 



Chelae Not attenuated 



Robust, not slender 



Undersurface not smooth, tending to squamiform 



markings 

 Posterior border of arm not with two spines 

 Posterior border of arm not without spines 

 Spine on inner surface wrist not particularly long 

 Spine on inner surface wrist not reduced to tubercle 

 Upper plus outer surface wrist with only one spine 

 Hand not swollen 

 Inner surface hand with carina 

 Upper surface hand with one spine only 

 Upper surface hand with spine on inside only 

 Fingers strongly carinated 

 Upper margin moveable finger not fringed with hairs 



Fifth leg Posterodistal border merus bearing spine or spines 



Border bearing spinules 



Their 

 arbitrary 

 numbers 



5 

 6 

 7 

 8 



9 

 10 

 11 

 12 

 IS 

 14 



15 

 16 

 17 

 18 

 19 

 20 

 21 



H 

 25 



26 



27 

 28 



29 

 SO 

 SI 



04 

 85 

 86 



37 

 38 

 89 



40 

 41 

 42 



48 

 44 



