New Crayfish Species 
73 
Proximal podomere of antennular peduncle with strong spine on 
ventral surface slightly proximal to midlength; antennal peduncle with 
acute ventromedial spine on ischium and larger distolateral spine on 
basis. Antennal flagellum about 49 mm long, tip reaching midlength 
of fourth abdominal tergite when flagellum adpressed. Antennal scale 
(Fig. IK) 3.1 times as long as wide, greatest width just distal to 
midlength; distal margin of lamella steeply declivous to widest part, 
row of setae not encroaching on base of apical spine, mesial margin 
narrowly curved; lateral margin thickened, gently bowed and with 
strong apical spine, tip of which directed distolaterally and reaching 
distal margin of ultimate podomere of antennular peduncle and base 
of distal one-third of same podomere of antennal peduncle. 
Third maxilliped with tip reaching about midlength of basal podomere 
of antennal peduncle, tip of exopodite reaching base of distal one- 
fourth of merus of endopodite; cephalolateral margin of ischium produced 
as acute spine; ventrolateral ridge flanked mesially by row of punctations 
bearing short setae; most of ventrolateral half with sparse punctations 
and short setae, but distomedial margin with longer setae; ventromesial 
half of ischium with long, stiff setae, longer and more dense proximally 
than distally and obscuring proximal portion; surface between bases 
of setae and dentate mesial margin glabrous, margin with 23 denticles. 
Right mandible with incisor ridge bearing 7 denticles (6 on left). 
Right chela (Fig. 1J) with moderately inflated palm, ratio width 
to depth 1.6, ratio length to depth 1.3; lateral margin of palm and 
proximal fixed finger visibly but narrowly costate dorsally and ventrally; 
chela 2.7 times longer than wide, shorter than carapace (ratio TCL 
to chela length 1.2). Dorsal surface of palm densely punctate, most 
punctations with short setae, but longer and more plumose ones laterally 
and mesially. Mesial margin of palm with 2 obvious rows of tubercles; 
mesialmost row subserrate, with 8 acute, subconical tubercles (9 on 
left chela), and distomesial margin of articular ridge produced as additional 
rounded tubercle; single small, rounded tubercle at proximolateral base 
of proximalmost tubercle; mesial row of tubercles flanked dorsally 
by irregular row of 7 (8 on left) anteriorly rounded to subsquamous 
tubercles; 2 rounded tubercles dorsal to dorsal row at about midlength 
of palm, and 4 subsquamous to squamous tubercles lateral to these; 
all tubercles with group of setae originating at distal base. Ventral 
surface of palm subglabrous, with sparse, shallow punctations and 
minute setae. 
Fingers moderately gaping in proximal half, opposable surfaces 
contiguous along distal half. Dactyl subovate in cross-section; mesial 
surface gently bowed, with 2 rows of anteriorly elevated and rounded 
