I'EREZ KARKANTK: AMKRK'AN SOI.KNOCKRII) SHRIMPS 



TABLE 1. — Characteristics distinguishing Hadropenaeus affinis from H. modestus. 



Feature 



H. affinis 



H modestus 



Scaphocerite 

 Prosartema 

 Fourth pereopod 



Coxa of fifth pereopod in 



females 

 Terminal portion of telson 

 Telsonic spines 



Telsonic pubescence 



Petasma 



Thelycum 



Reaching distal end of antennular peduncle or surpassing it 



by less than 0.10 of its own length 



Extending only to distomesial extremity of first antennular 



article 



Extending farther anteriorly than third pereopod; surpassing 



antennular peduncle by as much as length of dactyl and that 



of propodus; length of dactyl less than 0.5 that of propodus 



Bearing strong anteromesial spine 



Long, length 3.5-4.5 its basal width 



Long, length more than 1.5 basal width of terminal portion of 

 telson 



Extensive, lacking on terminal portion 



Ventromedian lobule with distomesial projection directed 

 mesially; distal part of dorsolateral lobule subelliptical 



Protuberance of sternite XIV mammiform, with apical part 

 directed ventrally; median keel of sternite XIII produced into 

 anteriorly directed blunt tooth 



Surpassing antennular peduncle by as much as 0.25 of its 

 own length 



Conspicuously overreaching distomesial extremity of first 

 antennular article 



Not extending so far anteriorly as third pereopod. reaching at 

 most distal end of first antennular article; length of dactyl 

 greater than 0.5 that of propodus 



Lacking anteromesial spine in adult, occasionally with in- 

 conspicuous one in juvenile 

 Short, length 2.5-3.3 its basal width 



Short, length not more than basal width of terminal portion of 

 telson 



Limited to paired rows flanking median sulcus and lateral 

 margins 



Ventromedian lobule with distomesial projection directed 

 distally; distal portion of dorsolateral lobule subrectangular 



Protuberance of sternite XIV subovate, with apical part di- 

 rected anteriorly; median keel of sternite XIII produced into 

 ventrally or posteriorly directed blunt tooth 



vier calculated from Smith's erroneous data. 

 Finally, the lateral ramus of the uropod is similar 

 in shape in the two species, its distal part truncate 

 and turning gently proximomesially. The descrip- 

 tions of both the petasma and the thelycum of 

 H. affinis presented by A. Milne Edwards and 

 Bouvier (1909), together with the two diagnostic 

 characters mentioned above, adequately diagnose 

 the species. 



Specimens from various localities in the west- 

 ern Atlantic exhibit differences in the shape of 

 coxal spine of the fifth pereopod which varies 

 from nearly blunt to sharply acute. Also in the 

 sculpture of the thelycum, the apical portion of 

 the protuberance on sternite XIV may be directed 

 anteriorly or ventrally. The observed variations, 

 however, intergrade and, furthermore, in some 

 specimens the shape of the spine and the direction 

 of the protuberance are identical to those ex- 

 hibited by the syntypic material. 



Remarks -The numerous records cited above are 

 the first from the western Atlantic since Bouvier 

 (1906b) cited a syntypic male from off Barbados 

 (Blake stn 273) in the original description of the 

 species, and A. Milne Edwards and Bouvier ( 1909) 

 recorded an additional juvenile male, which had 

 been taken with the syntype. 



The presence of photophores on the thoracic 

 sternites of this species is revealed here for the 

 first time. The photophores were observed in a 

 recently caught specimen obtained from the Ore- 

 gon II, south of Great Inagua, Bahamas; they are 

 similar to those described by Burkenroad (1936) 

 in Hymenopenaeus debilis. 



Hadropenaeus modestus (Smith 1885) 

 Figures 9, 44B, 46B, 49-52 



Hymenopenaeus modestus Smith 1885:183 [holo- 

 type: 9 USNM 7267; type-locality: off Bethany 

 Beach, Del., 38°31'N, 73°21'W, 156 fm (285 m), 

 Fish Hawk stn 1047]. Burkenroad 1936:104. 

 Bullis and Thompson 1965:5 [part]. Crosnier 

 and Forest 1973:259. 



Haliporus modestus. Bouvier 1905a:980; 1906b:4; 

 1908:80. A. Milne Edwards and Bouvier 1909: 

 209. de Man 1911:7. Fowler 1912:543. 



Material 



UNITED STATES— Delaware: 2 holotype, USNM 7267, 

 off Bethany Beach, 285 m, 10 October 1881, Fish Hawk stn 

 1047. North Carolina: 1 6, USNM, SE of Cape Lookout, 

 348-384 m, 13 November 1956, Combat stn 171. 1 3, USNM, 

 SE of Cape Lookout, 329 m, 1 February 1972, Oregon II stn 

 11762. 1 6 2 9, USNM, SE of Cape Fear, 187-190 m, 

 29 February 1960, Silver Bay stn 1693. Georgia: 1 2, USNM, 

 off Ossabaw, 238 m, 21 January 1972, Oregon II stn 11720. 

 Florida: 1 6, USNM, off Melbourne Beach, 329 m, 31 January 

 1957, Combat stn 226. 1 2 , USNM, off Hobe Sound, 302-285 m, 



21 May 1968, Gerda stn 997. 1 2, AMNH, 21 km E of Boynton. 

 320-266 m, 17 May 1948, Burey. 1 9, RMNH, off Miami, 418 m, 

 27/28 August 1962, Gerda stn 53. 19, RMNH, E of Old Rhodes 

 Key, 146 m, 25 September 1964, Gerda stn 427. 2 2 , USNM, off 

 Elliott Key, 194-187 m, 25 August 1967, Gerda stn 857. 1 9, 

 UMML, NE of Key Largo, 265-275 m, 24 January 1964, Gerda 

 stn 229. 3 6 3 9, USNM, SE of Key Largo, 185 m. 



22 January 1965, Gerda stn 452. 1 2, RMNH, SW of Marquesas 

 Keys, 188-199 m, 28 November 1964, Gerda stn 432. 1 6, 

 USNM, SW of Marquesas Keys, 177-229 m, 26 April 1969, 

 Gerda stn 1087. 1 S, UMML, S of Dry Tortugas Is, [?] 68 m, 

 12 April 1965, Gerda stn 564. 1 I , USNM, SW of Dry Tortugas, 

 348 m, 13 April 1954, Oregon stn 1005. 1 part of carapace, 



323 



