FISHERY BULLETIN: VOL. 75, NO. 2 



Gender-Masculine. 



List of species. -This genus includes only one spe- 

 cies: the western Atlantic Mesopenaeus tropi- 

 calis (Bouvier 1905b). 



Affinities. -Mesopenaeus resembles Solenocera in 

 possessing a flattened ventral flagellum, but in 

 the former this appendage is neither so flattened 

 and broad nor is it channeled as it is in the latter. 

 It shares with its more closely allied genera — 

 Hymenopenaeus , Haliporoides, Pleoticus, and 

 Hadropenaeus — a subcylindrical dorsal flagellum, 

 and a similar armature of the lateral ramus of 

 the uropod, the lateral rib of which ends in a well- 

 defined spine. The stout body, deep rostrum with 

 the ventral margin pronouncedly convex, ar- 

 rangement of the epigastric and rostral teeth, 

 and absence of both branchiocardiac sulcus and 

 carina place Mesopenaeus closer to Hadropenaeus 

 than to the other genera. Mesopenaeus differs 

 from Hadropenaeus, however, in that the ventral 

 flagellum is invariably depressed, whereas in the 

 latter it is almost always subcylindrical (in occa- 

 sional individuals of//, lucasii the ventral flagel- 

 lum is depressed). In Mesopenaeus orbital and 

 branchiostegal spines are present, and the thely- 

 cum exhibits paired anterior protuberances on 

 sternite XIV which are present elsewhere among 

 the solenocerids only in the members of the 

 nominal genus. Finally, in Mesopenaeus the ven- 

 tral costa of the petasma is fused to the flexible 

 terminal part of the ventrolateral lobule, whereas 

 in Hadropenaeus the ventral costa is distally free 

 from the sclerotized terminal part of the lobule. 



Mesopenaeus tropkalis (Bouvier 1905) 



Figures 9, 34, 56-63 



Parartemesia tropicalis Bouvier 1905b:748 "mer 

 des Antilles" in 80-175 fm ( 146-329 m). [No type 

 designated.] 



Haliporus tropicalis. Bouvier 1906b:4; 1908:80. 

 A. Milne Edwards and Bouvier 1909:217, fig. 

 45-54, pi. 3, fig. 1-19 Llectotype 9, MCZ 7199; 

 type-locality: "Blake: Florida Bank, lat. N. 26° 

 31', long. 0. 85° 03', 119 brasses." Paralectotype 

 9, MP, off Barbados, 13°04'12"N, 59°36'45"W, 

 76 fm (139 m), 5 March 1879, Blake stn 2721. 

 de Man 1911:7. 



Hymenopenaeus tropicalis. Burkenroad 1936:103. 

 Springer and Bullis 1956:8. Boschi 1964:38. 



332 



Bullis and Thompson 1965:5. Williams 1965:15, 

 fig. 5-7. Cerame-Vivas and Gray 1966:263. 

 Mistakidis and Neiva 1966:434. Roberts and 

 Pequegnat 1970:29. Pequegnat and Roberts 

 1971:8. Iwai 1973:44, fig. 13. 



Solenocera weymouthi Lindner and Anderson 

 1941:181, fig. la-e [holotype 9, USNM 79357; 

 type-locality: off Orange Beach, Ala., 29°28'N, 

 87°30'W, 46 fm (84 m), Pelican stn 137-2, 

 1 March 1939; allotype 6, USNM 79359, 23 km 

 S of Dry Tortugas, 110 m, 5 August 1932, Anton 

 Dohrn stn 74-32; paratype 6, USNM 79358, 

 locality as in holotype; 71 6 78 9 , USNM 23420, 

 between Cape Hatteras and Cape Lookout, 

 N.C., 34°35'30"N, 75°45'30"W, 32 fm (59 m), 

 18 October 1885, Albatross stn 2605]. Ander- 

 son and Lindner 1945:286. 



Hypenepenaeus tropicalis. Mistakidis 1965:9. 



Material 



UNITED STATES— North Carolina: 2 6 1 9,UNC-IMS, 

 NE of Cape Lookout, 90-110 m, 27 April 1965, Eastward stn 

 1087. 71 6 78 9 (paratypes Solenocera weymouthi), USNM 

 23420, NE of Cape Lookout, 59 m, 18 October 1885, Albatross 

 stn 2605. 1 9, USNM, SE of Cape Lookout, 82 m, 21 June 1957, 

 Combat stn 406. 1 6 1 9 , UNC-IMS, SE of Cape Lookout, 229 m, 

 8 June 1949, Albatross III stn 21-4. 8 8 8 9 , USNM, SE of Cape 

 Lookout, 154 m, 8 June 1949, Albatross III. 2 6 4 9, UNC-IMS, 

 E of Cape Fear, 100 m, 27 April 1965, Eastward stn 1089. 1 6, 

 UNC-IMS, SE of Cape Fear, 140-145 m, 27 April 1965, Eastward 

 stn 1086. 2 6 2 9, USNM, SE of Cape Fear, 183 m, 

 29 January 1972, Oregon II stn 11747. 3 6 5 9, USNM, off 

 Cape Fear, 190-187 m, 29 February 1960, Silver Bay stn 1694. 

 1 6 8 9, USNM, SE of Cape Fear, 187-190 m, 29 February 1960, 

 Silver Bay stn 1693. South Carolina: 1 9, USNM, off Cape I, 

 183 m, 28 January 1972, Oregon II stn 11743. 1 9, USNM, 

 E of Bull Bay, 181 m, 5 January 1885, Albatross stn 2313. 2 9, 

 USNM, E of Bull Bay, 155 m, 5 December 1960, Silver Bay 

 stn 2535. 1 9, USNM, off Santa Helena Sound, 83 m, 

 28 April 1966, Oregon stn 6073. Georgia: 4 9, USNM, off 

 Savannah, 68-91 m, 14 December 1961, Silver Bay stn 3658. 

 18 2 9, USNM, off Savannah, 73 m, 12 March 1956, Bowers 

 stn 54. 19, USNM, off Savannah Beach, 73 m, 26 April 1966, 

 Oregon stn 6062. 1 6, USNM, off Catherines Sound, 37 m, 

 13 March 1940, Pelican stn 195-10. Florida: 1 V, USNM, off 

 Fernandina, 179 m, 18 January 1972, Oregon II stn 11699. 

 1 6 9 9, USNM, off St Augustine, 75 m, 24 April 1966, Oregon 

 stn 6044. 1 8 3 9, USNM, off St Augustine, 40 m, 5 September 

 1962, Silver Bay stn 4340. 1 9, USNM, off Matanzas Inlet, 

 183 m, 18 November 1965, Oregon stn 5741. 1 9, USNM, off 

 Matanzas Inlet, 64-87 m, 7 October 1962, Silver Bay stn 4451. 

 1 9, USNM, off Ponce de Leon Inlet, 73-97 m, 5 October 1962, 

 Silver Bay stn 4420. 18 19, USNM, off Edgewater, 51-37 m, 

 24 August 1965, Oregon stn 5603. 1 9, USNM, off Cape 

 Kennedy, 70 m, 16 January 1966, Oregon stn 5860. 1 9 , USNM, 

 off Melbourne Beach, 73 m, 14 July 1961, Silver Bay stn 3279. 

 1 9, UMML, NE of St Lucie Inlet, 38-42 m, 21 May 1968, 

 Gerda stn 1002. 1 6, UMML, SE of St Lucie Inlet, 60-62 m, 

 21 May 1968, Gerda stn 1001. 1 9, RMNH, E of Miami, 119 m, 



