PARACYCLOPS REVISION 



143 



Antennule 8-segmented (Figure 26A.H); third segment with par- 

 tial suture line. Coxobasis of antenna with spinular row near base of 

 inner setae on caudal surface (arrowed in Figure 26C); second 

 endopodal segment with 9 setae, one seta transformed into massive 

 recurved claw (arrowed in Figure 26C); third endopodal segment 

 armed with 7 setae around apex; 2 of which modified into claw-like 

 setae (arrowed in Figure 26C). 



Spine and seta formula of swimming legs (Figure 27A-D) as 

 follows: 





Coxa 



Basis 



Exopod 



Endopod 



Leg 1 



0-1 



1-1 



I-1;I-1;NI,5 



0-1 



0-1; 1,1,4 



Leg 2 



0-1 



?-0 



I-1;1-I;III,I,5 



0-1 



0-2 



1,1,4 



Leg 3 



0-1 



1-0 



I-1;I-1;III,I,5 



0-1 



0-2 



1.1.4 



Leg 4 



0-1 



1-0 



1-1:1-1:11.1.5 



0-1 



0-2 



1,11.2 



Leg 5 (Figure 26L) comprising single free segment, armed with 1 

 long (almost twice as long as inner spine) outer spinulose seta, 1 

 inner spine surrounded with spinules at base, and 1 plumose seta 

 centrally. 



Adult male. Unknown. 



Differential diagnosis. P. dilaiatus is remarkable because of 

 the highly transformed seta which forms the massive claw on the 

 second endopodal segment of the antenna (arrowed in Figure 26C). 

 No other Parucyclops species possesses such a modified seta on this 

 segment. 



Remarks and comparisons 



Sars (1927a) initially published Platycyclops dilatatus as a nomen 

 nudum but his death prevented him from describing the new species. 

 In 1952 Lindberg, on the basis of Sars's specimens, described this 

 taxon under the name Paracyclops dilatatus. Its incomplete and 

 inaccurate description as P. dilaiatus (Lindberg, 1952) led 

 Monchenko( 1977) to describe a new subspecies from the Black Sea 

 without examining the type specimens. Lindberg's ( 1952) interpre- 

 tation of the antennule as 10-segmented is wrong since the 

 examination of type material left no doubt that P. dilatatus has an 8- 

 segmented antennule. Lindberg (1952) admitted that that it was 

 difficult to examine and measure the specimens in his original 

 publication on P. dilatatus. However, Monchenko (1977) estab- 

 lished his new subspecies of P. dilatatus on the basis of having an 

 8-segmented antennule. The other main morphological characters of 

 the caudal rami and its setal elements are so similar to the type that 

 the description of a new subspecies^ dilatatus ivanegai Monchenko, 

 1977 is unjustified. Monchenko's description should be considered 

 to be the first good redescription of P. dilatatus Lindberg, 1952. 



Distribution. P. dilatatus is known only from the Caspian Sea 

 and the Black Sea basin in Ukraine. 



Paracyclops hardingi nom. nov. 



(Figures 28-32) 



Paracyclops fimbriatus andinus Lindberg, 1957 

 non Paracyclops andinus Kiefer, 1957 



ORIGINAL DESCRIPTION. Paracyclops fimbriatus andinus Lindberg. 

 1957: Folia Biol. Andina. 1: 39-52. 



TYPE LOCALITY. Lindberg's material (Lindberg, 1957) came from 

 two different sites in Peru, one from Lake Huampucocha and the 

 other from Lake Conococha. Since Lindberg did not specify on 



which material his description was based, therefore both lakes are 

 type localities. 



Material examined 



Since Lindberg's material of P. fimbriatus andinus has not been 

 obtained, some material collected (originally identified under the 

 name P.finitimus) duringThe Percy SladenTrust Expedition to Lake 

 Titicaca in 1 937 under the leadership of Mr H. Cary Gilson was used 

 to describe P. hardingi. A series of collections taken during the 

 expedition is stored in The Natural History Museum, London. 

 According to Harding (1955), the localities for the P. hardingi 

 examined in this study are as follows: the shores of Taman Bay, 

 Laguna Arapa, Laguna Umayo and the Lagunillas, from springs by 

 the Lagunillas, from the River Ramis and from a ditch by the River 

 Urubamba. These localities are mostly in the Altiplano surrounding 

 Lake Titicaca. The examined material is 2 9 9 (PFH 227/2), 1 9 (G/ 

 G 1/93/5), 3 9 9 (PFH 245). 3 9 9 and lcf(PFH 139); BMNH 

 1946. 11. 26.216-225. 



REDESCRIPTION OF ADULT FEMALE 



Body length (um) not including caudal setae, 894-1129, mean = 

 975, n = 10. Genital double-somite with surface ridge extending 

 either side of copulatory pore on ventral surface (Figure 28A). 

 Urosomal somites without surface pits (Figure 28A.B). Seminal 

 receptacle divided into small conical anterior and broad posterior 

 lobes as figured (Figure 28 A). Anal operculum broad and smooth. 

 Caudal rami parallel and short, about 2.1 times longer than broad; 

 anterolateral seta ( II ) long: terminal accessory seta plumose ( VI ) and 

 1.5 times longer than posterolateral seta (III); outer terminal seta 

 (IV) and inner terminal seta (V) well developed, spinulose and 

 homogeneously ornamented (Figure 28B). 



Antennule 8-segmented (Figure 29A); segment 3 with partial 

 suture line reaching nearly to outer margin of segment, and with 

 spiniform seta. Setal formula 8, 12, 6, 5, 2 + aesthetasc, 2, 2 + 

 aesthetasc. 7 + aesthetasc. Coxobasis of antenna with complex 

 ornamentation on caudal and frontal surfaces as figured (Fig. 29B.C), 

 and with well-developed spinular row near base of two inner setae 

 (arrowed in Figure 29B). 



Intercoxal sclerite of leg 1 ornamented with spinular row on 

 anterior surface (Figure 30B). lacking spinules on posterior surface 

 (Figure 30A). Intercoxal sclerite of leg 2 ornamented with spinular 

 row on both anterior and posterior surfaces (Figure 30D.E). 



Intercoxal sclerite of leg 3 without spinular row on anterior 

 surface (Figure 3 ID) and with 2 spinular rows on posterior surface 

 (Figure 31C). Intercoxal sclerite of leg 4 (Figure 31B) with groups 

 of spinules on posterior surface; first and second exopodal segments 

 without spinular row on posterior surface. 



Spine and seta formula as follows: 



Coxa 



Basis 



Exopod 



Endopod 



Legl 



0-1 



1-1 



1-1:1-1 ;III,5 



0-1:0-1 



1,1,4 



Leg 2 



0-1 



1-0 



I-1;I-1;III,I,5 



0-1:0-2 



1.1,4 



Leg 3 



0-1 



1-0 



1-1:1-1 ;III.I,5 



0-1:0-2 



1.1,4 



Leg 4 



0-1 



1-0 



1-1:1-1:11.1,5 



0-L0-2 



1,11,2 



Leg 5 (Figure 28C) comprising single free segment, armed with 

 1 long (almost 1.5 times longer than inner spine) well-developed 

 outer spinulose seta, 1 inner spine, 1 plumose seta in centre. Leg 6 

 (Figure 28B) represented by 1 plumose seta and 2 tiny spinules 

 dorsolateral^ 



Description of adult male 



Urosomal somites (Figure 32A.B) without ornamentation of surface 



