SEVEN SPECIES OF RED SEA ONCAEA 



37 



Fig. 7 Oncaea venusta f. typica, male (Red Sea) (A) PI. distal part of endopod; (B) P2. distal part ot'endopod; (C) P3, distal part of endopod. - Oncaea 

 venusta f. venella, male (Red Sea) (D) PI, distal part ot'endopod; (E) P2. distal part ot'endopod; (F) P3, distal part ot'endopod. 



and 1 -segmented endopod. Syncoxa without surface ornamentation, 

 except for several secretory pores, unarmed. Basis robust, particu- 

 larly inflated in proximal half forming bulbous swelling; anterior 

 surface with 2-3 transverse spinular rows in addition to row of short 

 flat spinules along inner margin (Fig. 6C); posterior surface with 3 

 rows of short spatulated spinules of graduated length along palmar 

 margin (Fig. 6C); with 2 small naked setae within the longitudinal 

 cleft, nearly equal in length. Endopod drawn out into long curved 

 claw, concave margin unornamented; accessory armature consisting 

 of short, unipectinate spine basally fused to inner proximal corner of 

 claw; tip of claw with minute hyaline apex. 



Swimming legs 1-4 with armature and ornamentation as in 

 female; sexual dimorphism expressed in terminal process on PI enp- 

 3, being longer than in female, reaching half the length of distal 

 spine (Fig. 7A) and in conical projections on distal endopod segment 

 of P2-P3. being longer than in female, reaching half the length of 

 outer distal spine (Fig. 7B, C). 



P5 (Fig. 6G) exopod not delimited from somite, general shape and 

 armature as in female, except for subapical seta spiniform and 

 shorter than in female, ornamented with row of minute spinules 

 along outer margin. 



P6 (Fig. 6E) represented by posterolateral flap closing off genital 

 aperture on either side; covered by pattern of denticles as shown in 

 Fig. 6E and 10A; with receptor (pores) at inner edge of posterola- 

 teral corners (Fig. 10B); these corners not protruding laterally so that 

 they are hardly discernible in dorsal aspect (Fig. 6D). 



Spermatophore oval (Fig. 6F), of variable size according to state 

 of maturity; swelling of spermatophore during development not 

 affecting shape and relative size of genital somite. 



Oncaea venusta Philippi, 1843 forma venella Farran, 1929 



Oncaea venusta Farran (1929): 284-285, Fig. 33 (female only) [as 

 Onccea venusta forma venella]. 



Onccea venusta forma venella Farran, 1929 



TYPE LOCALITY. Not specified, various locations in the temperate 

 and tropical Atlantic, as well as south of New Zealand (Farran, 

 1929). 



Material examined 



(1) Central Red Sea, 21° 22.09'N, 38° 05.09'E: Stn. 664; RN 

 Valdivia leg 29: collected 21 February 1981 with MSN 0.1 mm 

 net (Haul 218/5); depth 0-50 m; total water depth ca 2000 m. 



(a) 5 99, 5 66 in alcohol (BMNH 1998.2787-2796) 



(b) 5 99, 5 6 6 in alcohol (ZMH K-39587) 



(c) numerous 99 and 66 (RBS). 



(2) Southern Red Sea, 15° 34.8'N,41° 54.9'E: Stn. 102; RN Meteor 

 leg 5/5: collected 03 August 1987 with MSN 0.05 mm net (Haul 

 39/5); depth 0-50 m; total water depth 970 m: 1 6 in alcohol 

 (RBS). 



(3) Southern Red Sea, 15° 34.8'N, 41° 54.9'E: Stn. 703; RN Meteor 

 leg 5/5: collected 03 August 1987 with MSN 0.05 mm net (Haul 

 39/4); depth 50-100 m; total water depth 970 m: 2 99, 2 66 

 dissected on slides, 1 9, 1 6 in alcohol (RBS). 



DESCRIPTION. Note illustrations are based on (3). 



Adult female (Figs. 11-13) 



Body length (measured in lateral aspect; from anterior margin of 



