POLY: REDESCRIPTION OF THE HOLOTYPE OF ARGULUS FL O RIDE NS IS 
135 
Figure 2. Argulus floridensis : Second maxil¬ 
la, raised pad with scales (adjacent on thorax), 
accessory spine, and postmaxillary spine. Scale 
bar = 200 pm. 
2nd 
3rd 
4th 
protruding laterally and anteriorly in 
apposition to posterior lobe of coxae of 
second legs (Fig. 3A). Four pairs of 
biramous swimming legs composed of a 
precoxa, coxa, basis, exopod, and endo- 
pod. Exopods and endopods with 
plumose setae. First two pairs of legs 
lacking flagella. Endopods of first pair 
of legs 3-segmented with 3 setae distal- 
ly. Endopods of second pair of legs 
unsegmented. Endopods of third and 
fourth pairs of legs 2-segmented. 
Second, third, and fourth legs of male 
with secondary sexual structures (Figs. 
3A, B). 
First legs lack secondary modifica¬ 
tions. Second legs, the posterior ventral 
margin of coxae expanded into broadly-rounded lobe with many small, closely-arranged scales. 
Third legs, dorsal anterior coxae with broadly-rounded hump armed with many scales directed 
proximally; distal to this hump are two smaller, unarmed protuberances; at anterior distal margin 
of coxae an anteriorly-directed, fleshy projection (“upright fingerlike papilla” of Meehean 1940) 
(Fig. 3A). 
Third legs with two sclerotized pegs in cleft on dorsal side at distal margins of coxae (or fused 
coxae+bases); pegs with a single, large hom and orifice distally; sclerotized ridge at anterior 
dorsal of coxa/basis junction; one fleshy papilla extends proximally (mesially) from sclerotized 
ridge anterior of two pegs and overhanging cleft (“saddle-shaped depression” of Meehean 1940). 
Posterior to pegs and cleft a triangular-shaped lobe covered with scales (Fig. 3B). Posterior mar¬ 
gins of both precoxae+coxae and bases of fourth legs with natatory lobes bearing plumose setae. 
Anterior of bases a sclerotized ridge lies on basal half, opposed by recurved, finger-like appendage 
covered with fine scales distally; tiny spines or scales on its tip (Fig. 3A). 
Abdomen bilobate. Abdomen length 1.72 mm [Meehean 1940: 1.58 mm]; maximum width 
3rd 
Figure 3. Argulus floridensis'. A) ventral view of legs 2, 3, and 4 
(precoxa, coxa, and basis only); exopods, endopods, setae, and sensil- 
lae omitted. B) dorsal view of leg 3 (precoxa, coxa, and basis only). 
Scale bar = 500 pm. 
