Decapoda, Palaemonidae) 1) By
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NEW DISTRIBUTION' RECORDS FOR SPECIES OF MACROBRACHIUM WITH NOTES ON THE DISTRIBUTION OF THE GENUS IN FLORIDA (DECAPODA, PALAEMONIDAE) 1) BY LIPKE B. HOLTHUIS Rijksmuseum van Natuurlijke Historie, Leiden, Netherlands AND ANTHONY J. PROVENZANO, JR. Rosenstiel School of Marine and Atmospheric Sciences,University of Miami, Florida, U.S.A. The palaemonid shrimp genus ?Ylacrobrachium was known to be represented in Florida waters by four species: M, acanthuriis (Wiegmann, 1836) (Schmitt, 1933: 313, 314, St. Augustine, Miami River, Coconut Grove; Hedgpeth, 1949: 31, fig. 5, St. Augustine, Coconut Grove; Holthuis, 1952: 50, St. Augustine, Daytona Beach, Sebastian, Fort Pierce, Boca Raton, Miami), At. ohione (Smith, 1879) (Holthuis, 1952: 69, St. John's River), At. olfe;-sil (Wiegmann, 1836) (Schmitt, 1933: 315, St. Augustine; Hedgpeth, 1949: 35, fig. 5, St. Augustine; Holthuis, 1952: 100, St. Augustine, Silver Glen Springs) and M. carcinus (L., 1758) (Schmitt, 1933: 313, 314, 316, St. Augustine, Silver Springs and Miami River; Hedgpeth, 1949: 32, fig. 5, St. Augustine, Miami, and Big Pine Key; Holthuis, 1952: 123, St. Augustine, Silver Glen Springs, Miami River, Big Pine Key). All of these, with the exception of M. olfersii, have a wide range in the southern U.S.A. Outside its range in South and Central America, M. olfersii so far was only known from north Florida. Recent collecting in south Florida waterways has revealed the presence of two additional species, neither of which had been reported from the U.S.A. before. The purpose of this note is to record the occurrence of these two species and to extend southward the known range of M. olfersii in this state. The abbreviation cl. is used here to indicate the carapace length measured from the posterior limit of the orbit to the postero-median point of the carapace. Macrobrachium faustinum (De Saussure, 1857) MacrobrachiumfauJtillum - Holthuis, 1952: 88, pls. 22, 23 (synonymy); Chace & Hobbs, 1969: 102, figs. 23, 25d, j. Material. - Snapper Creek Canal, at 7501 S.W. 99th Avenue, Miami, Dade County, Florida; 28 September 1961; K. Hines; UMML 32.2146. - 1 male, cl. 18 mm. Snapper Creek, South Miami, Dade County, Florida; 20 May 1951; C. Phillips; UMML 32.1023. - 1 male, cl. 18 mm. 1) Sci. Con. no. 1167 from the Institute of Marine and Atmospheric Sciences, University of Miami. This work was supported in part by research grant GB-7075X from the National Science Foundation. 212 Snapper Creek at Parrot Jungle (57th Avenue and Killian Drive), Miami, Dade County, Florida; June 1961; Steven S. Gross; UMML 32.2148. - 2 males, cl. 15 and 19 mm. On north shore seaward side of salinity dam of Canal C-100, off Old Cutler Road, Miami, Dade County, Florida; in freshwater outfall; 17 August 1969; Daniel Provenzano; UMML 32.3829. - 1 ovigerous female, cl. 11 mm. Canal C-N 1, a branch of the Bellair Canal (Black Creek system) under bridge of U.S. Highway I (South Dixie Highway) near Peters, 8 miles S. of Miami, Dade County, Florida; along rocky shore of canal, 0.5 m deep; 7 August 1969; A. J. Provenzanoand L. B. Holthuis; RMNH Crust. D 26553. - 1 female, cl. 17 mm. The ovigerous female was quite transparent when collected and for some days thereafter, while maintained in freshwater. However, chromatophore expansion gave her a dark coloration after having been placed directly into full strength sea water. The males with carapace lengths of 18 and 19 mm have the larger second leg well developed. In the male with cl. 15 mm this chela was much weaker, although having many of the adult characters (spinulation, pubescence). In the male from Snapper Creek Canal the large cheliped is absent, while also the rostrum is broken. Mac,robrachium faustinum was known from the West Indian Islands, including the Bahamas and is now reported for the first time from the American Continent. In their report, Chace & Hobbs summarized the known distribution which in- cluded localities as close to southern Florida as Cuba and Andros Island. There- fore it is not unexpected to find the species well established in southern Florida. Macrobrachium olfersii (Wiegmann, 1836) Macrobrachium olfersii - Holthuis, 1952: 95, pls. 24, 25 (synonymy). Material. - Snapper Creek at Parrot Jungle (57th Avenue at Killian Drive), Dade County, Florida; June 1961; Steven S. Gross; UMML 32.2140. - 1 male, cl. 22 mm. - Remarks. Schmitt (1933) reported this species from St. Augustine, Florida, and Holthuis ( 1952) mentioned it from the same locality and from Silver Glen Springs some 500 km north of where the present specimen was found. Macrobrachium ol f er.rii and M, faustinum are closely related; their ranges practically do not overlap. M. olfersii is known from the continent of Central and South America from Mexico to S. Brazil and from Florida. The only area where the two species are found side by side is southern Florida, where, judging by the present material from Snapper Creek, they even occur in exactly the same locality. The occurrence of At. fau.rtinum in southern Florida fits very nicely in the general pattern of distribution of that species, but the Florida finds of M. olfersii are so eccentric that it has been suggested that the species was introduced into Florida waters with waterplants or fishes from South America. This seems a logical explanation for its curious distribution pattern. Macrobrachium heterochirus , (Wiegmann, 1836) Macrobrachium heterochirus - Holthuis, 1952: 69, pl. 15 figs. a, b, pl. 16 figs. a-c (synonymy); Chace & Hobbs, 1969: 106, figs. 24, 25e, k. Material. - Cutler Ridge, South of Miami, Dade County, Florida; west side of flood control dam at Franjo Road and Bellair Drive, on rocky shore in a few centimeters of water; 3 March 1969; A. J. Provenzano; UMML 32.3828. - 1 male, 1 female. .