Sergestes geminus Judkins 1978

Sergestes geminus

HOLOTYPE.—USNM 155060, adult , 7.1 mm CL.

TYPE-LOCALITY.—Sorted from micronekton collection taken at ETP 14 sta 326 (4°48'N, 83°38'W); 1 Apr 1967; nighttime oblique tow with BMN from ca. 200 m depth.

ALLOTYPE.—USNM 155061, adult , 8.9 mm CL; sorted from micronekton collection taken at ETP 14 sta 037 (0°46'N, 80°42'W); 8 Feb 1967; nighttime oblique tow with BMN from ca. 200 m depth.

PARATYPES.—USNM 155063, 1 adult , 7.1 mm CL; sorted from micronekton collection taken at ETP 14 sta 138 (7°55'S, 88°46'W); 2 Mar 1967; nighttime oblique tow with BMN from ca. 200 m depth. USNM 155062, 4 adult and subadult , 6.2, 6.4, 7.0, 7.3 mm CL, and 5 adult and subadult , 6.8, 8.5, 8.7, 9.3, 9.4 mm CL; from same collection as allotype.

ADDITIONAL MATERIAL.—SIO,Shellback:2(1 ), 6(2 , 2 ), 10(1 , 3 ), 11(1 , 3 ), 13(1 ). SIO, Eastropic: 3(3 ), 4(6 , 5 ), 5(4 8 ), 6(2 , 3 ), 8(1 , 1 ), 9(15 , 18 ), 11(17 , 1 ), 12(1 ), 13(2 , 6 ), 14(2 , 4 ), 15(5 ). SIO, Tethys: 8(2 , 6 ), 9(4 ). SIO, Anton Bruun 12: 65-606(1 ). SIO, Piquero: 29(1 ), 32(1 ), 43(2 ), 8-2(1 ). SIO, Quebrada: 16(2 ), 21(10 ). SIO, Aries I: E(1 ), 2(1 ), 3(2 ). SWFC, ETP 12: 059 (9 , 4 ), 067(5 , 4 ), 075(1 ), 084(4 , 14 ), 094(2 , 3 ), 106(4 ), 142(1 ), 212(1 ), 224(1 ), 235(4 , 4 ), 244(1 , 1 ), 252(22 ), 260(3 ). SWFC, ETP 14: 001(2 ), 014(1 ), 018(11 , 1 ), 022(14 ), 027(2 ), 031(3 , 1 ), 037(6 , 17 ), 043(7 ), 081(1 ), 132(3 ), 138(4 , 1 ), 154(2 , 1 ), 199(2 , 2 ), 206(1 , 1 ), 213(4 , 3 ), 232(11 , 1 ), 240(9 , 3 ), 255(1 ), 263 (17 ), 280(1 ), 287(6 , 1 ), 303(2 ), 310(3 , 3 ), 326(4 ).

The material listed is deposited in the SIO Zooplankton Collections.

DESCRIPTION.—Maxl palp, Mxp3 dactylus, and thelycum as in S. orientalis (cf. Figure 16k,l)

Petasma (Figure 16f–l) very similar to that in S. orientalis but differing in following features: LC usually bilobed (59% of males examined), third lateral lobe, when present, tending to be smaller than either inner lobe; LI and LT anterior lobe tending to be shorter relative to CL (Figure 18a,b).

DISTRIBUTION.—Like S. brevispinatus, S. geminus is clearly indigenous to the eastern tropical Pacific (Figure 17), differing in distribution from the former species primarily by its greater abundance in the western part of that region (Figure 7a,b).