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Petkovski, 1986) (Copepoda: Cyclopoida Bijdragen tot de Dierkunde, 63 (3) 173-191 (1993) SPB Academie Publishing bv, The Hague New records and redescriptions of American species of Mesocyclops and of Diacyclops bernardi (Petkovski, 1986) (Copepoda: Cyclopoida) Janet W. Reid Department of Invertebrate Zoology, NHB-163, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, U.S.A. Keywords: Taxonomy, Copepoda, Cyclopoida, Mesocyclops, new records, U.S.A. Abstract Introduction Recent collections in the south central U.S.A. have included Taxonomie understanding of the tropico-temperate three neotropical and one probably introduced species that are has eyelopoid eopepod genus Mesocyclops greatly presently assigned tothe cyclopoid copepod genus Mesocyclops. improved during the past decade. Recognition of Mesocyclops longisetus var. curvatus Dussart, 1987, is reported the importance of formerly ignored subtle morpho- from Louisiana, U.S.A., and Panama; published records of logical usually meristic characters by Kiefer( 1981), Mesocyclops longisetus (Thiébaud, 1914) sensu lato in the , Van de Velde and Dussart & Fernando southern U.S.A. are reviewed. Mesocyclops reidae Petkovski, (1984a, b), is reported from Mississippi, U.S.A., and Honduras. 1986, (1988) has led to more accurate characterization of Mesocyclops ruttneri Kiefer, 1981, is redescribed from type many paleotropical species. It is desirable to supply specimens collected in Austria, and newly reported from similarly detailed descriptions for the American Louisiana, Mississippi, China, Thailand, and Viet Nam. This species. species is considered to have been introduced from Asia into Austria and the U.S.A. Mesocyclops bernardi Petkovski, 1986, New records of copepods from non-lacustrine newlyrecorded from Louisiana and Mexico, is transferred to the wetlands in the southern U.S.A. have extended the genus Diacyclops. known geographical ranges of many species. Neo- tropical species appear to comprise a significant and previously little appreciated component of the Résumé regional copepod fauna (Reid, 1992). Several neo- tropical species appeared in collections of cyclopoid Dans des prélèvements récemment réalisés au sud des parties copepods that were made from Louisiana and Mis- centrales des U.S.A. ont été découvertes trois espèces néo- sissippi, U.S.A. by Gerald G. Marten and sent to tropicales et une espèce probablementintroduite de Copépodes me for determination 1989; 1990a, In Cyclopoïdes actuellement considérés comme appartenant au (Marten, b). Dus- addition to the North American genre Mesocyclops. Mesocyclops longisetus var. curvatus common Mesocy- sart, 1987, est mentionné de Louisiane (U.S.A.) et de Panamá; clops edax(S.A. Forbes, 1891), there were four spe- sont passés en revue les mentions publiées de Mesocyclops cies that are the same presently assigned to genus: longisetus (Thiébaud, 1914) sensu lato dans les zones méri- Mesocyclops bernardi Petkovski, 1986, Mesocy- dionales des U.S.A. Mesocyclops reidae Petkovski, 1986, est var. curvatus Meso- connu du Mississippi (U.S.A.) et du Honduras. Mesocyclops clops longisetus Dussart, 1987, reidae and ruttneri Kiefer, 1981, est redécrit sur des exemplaires-type cyclops Petkovski, 1986, Mesocyclops mentionné Missis- d’Autriche, et nouvellement de Louisiane, du ruttneri Kiefer, 1981. Examination of material in sippi, de Chine, Thaïlande, et Viet Nam; on considère cette es- the C.D. Marsh Collection of Copepoda in the pèce comme ayant été introduite d’Asie en Autriche et aux National Museum of Natural History led to new U.S.A. Mesocyclops bernardi Petkovski, 1986 — nouvellement recordsof M. longisetus var. curvatus andM. reidae mentionné pour la Louisiane et le Mexique — est transféré au from Panama and genre Diacyclops. Honduras, respectively. The 174 /. W. Reid - New records of American Mesocyclops and Diacyclops bernardi present article describes aspects of the morphology Discussion. — The New Orleans specimens are con- the the and reviews the known distribution of M. longise- gruent in proportions of caudal rami, the form of the antennular and in the tus var. curvatus, M. reidae, and M. ruttneri. The membrane, leg 4 3, with M. var. transfer of M. bernardi to the genus Diacyclops is endopodite longisetus curvatus 1987. The lateral of the seminal proposed. An additional new record for D. ber- Dussart, arms of nardi is given from Mexico. receptacles most specimens examined are strong- recurved In a few these For taxonomie examination, specimens were ly posteriorly. specimens, little recurved therefore closer treated according to the methods of Reid et al. arms are posteriorly, M. restricto (1989). Terminology, particularly for the seminal to longisetus (Thiébaud, 1914) sensu receptacle and the antennule is taken from Fiers & Dussart, 1987. The record from New Orleans was previously Van de Velde (1984) and Van de Velde (1984a, b). reported by Marten (1989, 1990b). The earliest Descriptions of the morphology of species of record of M. longisetus sensu lato in the U.S.A. Mesocyclops are based on the redescription of the Herrick may be that of (1887), whose extensive genotype, M. leuckarti (Claus, 1857) by Van de figures of “Cyclops simplex” from southern Velde(1984a). Specimens are deposited eitherin the Alabama clearly show a species of Mesocyclops collections of G.G. Marten, New Orleans Mosquito with the caudal ramus haired on the medial surface, Control Board, or in the U.S. National Museum of theantennularhyaline membrane with a single deep Natural History, Smithsonian Institution (USNM). notch, and the leg 4 coupler with two triangular projections. However, the illustration of the semi- nal receptacle (Herrick, 1887: plate VII, fig. la) Taxonomic section shows the medianthird of the anterior margin con- cave and the lateral arms tapering, not rounded as Family Cyclopidae Burmeister, 1834 the receptacle of M. longisetus. Reddell (1965, Subfamily Cyclopinae Dana, 1853, char, emend. repeated in Reddell & Mitchell, 1969) reported M. Kiefer, 1927 longisetus from Felton Cave, Sutton County, Genus Mesocyclops G.O. Sars, 1914 Texas. The species was also recorded from Florida by Dussart & Fernando (1986), but additional local- data for their record ity are unavailable (C.H. var. curvatus 1987 Mesocyclops longisetus Dussart, Fernando, in litt., 1990). It seems that M. longise- tus sensu lato, which is distributed through Mexico - and Central and South America as far south as Synonymy. Mesocyclops longisetus var. curvatus Dussart, 1987: 150, 156, figs. 3, 4, 7, 8; Reid, 1990: 181, table I. Patagonia and possibly Tierra del Fuego, occurs Mesocyclops longisetus (Thiébaud, 1914); Marten, 1989: 232, widely although sporadically in the southernU.S.A. 233, 235, table 1; 1990b: 681-687, tables 1,4, 5, 7, 8; Reddell, The distribution of M. longisetus var. curvatus is 1965: 157; ?Reddell & Mitchell, 1969: 7; ?Dussart & Fernando, uncertain. 1986: 291, 292. The records for Panama from the Marsh Collec- Cyclops simplex Poggenpol, 1874; ?Herrick, 1887: 14, 17-18, tion pl. VII fig. 1. are previously unpublished. Material. - USNM 252008, 699, samples Ml and M6, Lake Mesocyclops reidae Petkovski, 1986 Catherine marshes, 24 July 1991, after introduction from cul- tures originally collected from Joe Brown Lagoon, New (Figs. 1, 2) coll. G.G. Orleans, Louisiana, Marten. One 9, dissected on slide, and 2 9 9, ethanol-preserved, New sample 105, Orleans, Synonymy. - Mesocyclops reidae Petkovski, 1986: 47, 61-66, Louisiana, 1988,G.G. Marten collection. USNM Accession No. 71-73, 78, Abb. 11-22; 1988: 40; Sket, 1988: 79, table 1; Reid, 120079 (Marsh Collection), several 9 9 on slides, Panama, 1990: 181, table 1. C.D. Marsh prep. nos. 3826, 3827, 3842, 3843, and 3943. Un- Mesocyclops ellipticus (non Kiefer, 1936a); Yeatman, 1977: mounted in 70% specimens preserved ethanol. 5-7, figs. 1-16; Smith & Fernando, 1978: 2015, 2016, 2019, Bijdragen tot deDierkunde, 63 (3) - 1993 175 Fig. 1. Mesocyclopsreidae Petkovski, 1986, dissected from Mississippi, USNM 252009: a, pediger 5 and genital segment, right lateral; setae not and b, pediger 5 and genitalsegment, ventral; c, left leg 5, lateral-oblique, completelyindicated; d, copulatorypore pore-canal, lateral-oblique;e, anal somite and caudal rami, dorsal; f, anal somite and caudal rami, ventral; g, antennule articles 16 and 17; h, anten- indicated Scale to na article 1, caudal side; i, antenna article 1, frontal side; j, labrum, spines only on one side; k, maxilliped. applies Figs. 1a-c only. 176 J. W. Reid New records of American Mesocyclops and Diacyclops bernardi 2020, figs. 21-24, tables 1, 2; 1980: 11, 18,20, fig.9A-D, table margin (indicated by arrow) short, no other surface 2; Reddell, 1981: 81; Pesce, 1985: 296, 311, 316-318, figs. ornamentation. 63-65. of Labrum (Fig. lj) with 2 rows long spines on each side of median line. Maxillule as in M. leu- Material. - USNM 252009,1 9 , dissected onslide, and 10 9 9, ckarti, i.e. lacking spines on surface of palp. Maxil- ricefield, Cleveland, Mississippi, September 1991, coll. G.G. la in M. surface of Marten. USNM Accession No. 120079 (Marsh Collection), 2 as leuckarti, lacking spines on 9 9 on slides, C.D. Marsh prep. nos. 4288, 4296, Honduras. coxa (article 2), distal half of ventral surface of coxa rugose. Maxilliped (Fig. Ik) article 2 (basis) Description of female. - Range of lengths of Mis- with 3 transverse rows of small spines along poster- sissippi specimens 0.80-1.02 mm (median = 0.90 ior border; middle seta of article 4 (endopodite 2) mm, n = 10). Resembling description of Petkovski short in comparison to corresponding seta of con- (1986) of type population from San Andrés Island, geners. Colombia, in most details. Legs 1-4 as in M. leuckarti except in following Supplementary observations: Posterolateralmar- details. Leg 1 (Fig. 2a) with medial seta of basipo- gin of pediger 4 finely serrate (Fig. la). Pediger 5 dite short, stout, with spines at base; coupler with (Figs, la, b) with small lateral spines disposed in 2 rounded marginal expansions. Leg 2 (Fig. 2b), 3 diagonal rows. Leg 5 (Figs, la-c) with median medial expansion of basipodite haired, coupler inserted distal } of article 2.
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