COMPARISON OF SOME GENERA AND SPECIES OF BOX CRABS (BRACHYURA: CALAPPIDAE), SOUTHWESTERN NORTH ATLANTIC, WITH DESCRIPTION OF A NEW GENUS AND SPECIES AUSTIN B. WILLIAMSl AND C. ALLAN CHILD" ABSTRACf Five species ofcalappid crabs from the southwestern Atlantic that belong to the genera Calawa, Cyclozo­ dion new genus, and Paracyclois are analyzed on the basis of morphology, morphometries, geographic, and bathymetric range. Calawa tortugM, new rank. known in the past as C. angusta in the broad sense, is restricted and compared with its eastern Pacific twin species, C. sa"U8sursi. Two small species placed in Cyclczooio'/l were until now unrecognized and partly included in CakLwa angusta, broad sense. Cyclczo­ dion angustum, a relatively smooth form, is the type species of the new genus, and C. tuberatu'll~, a rough form superficially resembling Calawa tortugM, is described as new. Species of both Paracyclcis and the Early Tertiary genus Calappilia in which it was subsumed are reviewed, the former is revalidated, and its only two species, western Atlantic P. atlantis and western Indo-Pacific P. milneed.wardsii, are rediagnosed. Diagnoses and discriminations are accompanied by illustrations. Keys to calappid genera in the Western Atlantic, and for identification of Cyclozooion and Paracyclois species are given. Holthuis (1958) revised five species of West Indian 1984) on the basis of what were thought to be juve­ box crabs, Calappa cinerea Holthuis 1958, C. flam­ nile characters exhibited by the carapace of that mea (Herbst 1794), C. nitida Holthuis 1958, C. species. Review of the material in the USNM shows ocellata Holthuis 1958, and C. sulcata Rathbun 1898, this concept to be in error. Moreover, representa­ but a species from that region known until now as tives of the extant type series of C. angusta in the C. angusta A. Milne Edwards 1880 was not included Museum of Comparative Zoology (MCZ), Harvard in his paper because the collection he studied in­ University, consist of very small juveniles, a holo­ cluded no representatives of thatform. We find that type and four paratypes in which definitive char­ this latter species is not at all well defined, and the acters are poorly developed, that surprisingly belong purpose of this paper is to clarify its status and that not to one but three calappid species. "Calappa of similar species in related genera. angusta" as presently understood is in reality a com­ Samples of decapod crustaceans from exploratory plex of species belonging in Calappa Weber 1895 trawling by the Bureau of Commercial Fisheries RV and the previously unrecognized genus. Pelican, U.S. Fish and Wildlife Service RV Combat, Only two species of Paracyclois Miers 1886 National Marine Fisheries Service RV Silver Bay, have been described, the above mentioned, and the RV Oregon, and RV Oregon II deposited in the type species, P. milneedwardsii Miers 1886, from crustacean collection of the National Museum of the western Indo-Pacific. Glaessner (1969) synon­ Natural History (USNM), Smithsonian Institution, ymized Paraclyclois with Calappilia A. Milne contain specimens of a seldom reported calappid Edwards 1873, considered until that time to in­ crab, Paracycloi8 atlanti.s Chace 1939, 1940 from clude only species of Middle Eocene to Upper the Caribbean region of the western North Atlan­ Oligocene ages in North America, Europe, and the tic, and representatives of a genus not previously East Indian region, but did not discuss reasons for recognized. Two small calappid species in the cata­ his action. Because our determinations involved logued USNM crustacean collection have been at­ generic placement of material from trawl samples, tributed to Calappa angusta A. Milne Edwards 1880 we reviewed literature concerned with both of by Rathbun (1937) and other authors (see Williams these genera and studied specimens of selected species of Calappilia in the fossil crustacean lSystematics Laboratory, National Marine Fisheries Service, collection of the USNM. Austin B. Williams devel­ NOAA, National Museum of Natural History, Washington, DC oped the text, C. Allan Child rendered the draw­ 20560. "Department of Invertebrate Zoology, National Museum of ings, and both of us identified and cross-checked Natural History. Washington, DC 20560. material. Manuscript accepted August 1988. 105 Fishery Bulletin, U.S. 87:105-121. FISHERY BULLETIN: VOL. 87, NO.1 Key to Recent genera of Calappidae in Milne Edwards 1880:18.-Hay and Shore 1918: the western Atlantic Ocean 421, pI. 31, fig. 7.-Rathbun 1937:210, pI. 64, figs. 4-6.-Chace 1956:18 (list).-Williams 1965:154, 1. Chelae essentially symmetrical, no unusually fig. 134; 1984:273, fig. 203.-Pequegnat 1970: enlarged teeth or protuberances, Subfamily 177.-Powers 1977:30. Matutinae 2 Chelae dissimilar, major chela with large tooth Material studied.-Specimen lots in USNM re­ on dactyl and pair of protuberances on pro- corded by Rathbun (1937) under C. angusta and C. podus, Subfamily Calappinae 3 saussurei tortugae (catalog numbers only) plus material added since that time. 2. Carapace considerably broader than long, North Carolina: USNM 68530.-101676.10',19 regularly convex above . Guv.); 34°18'N, 75°58'W, SE off Cape Lookout, 137 · Hepatus Latreille 1802 m; Combat stn. 405, 21 June 1957.-101675. 1 0'; Carapace nearly as long as broad, dorsal 34°19'N, 75°M'W, SE off Cape Lookout, 183 m; surface uneven Osachila Stimpson 1871 Combat stn. 402, 21 June 1957.-202745. 10',29; 33°48'48"N. 76°34'24"W. 46 m; BLM, 4 Mar. 3. Posterolateral region of carapace not ex­ 1981.-202746. 1 9; 33°48'12"N, 76°34'24"W, 116 panded into dentate, winglike projection ....4 m; Duke Univ. for BLM, 14 May 1981.-202747.19 Posterolateral region of carapace expanded (ovig.); 33°47'36"N, 76°34'24"W, 116 m; Duke Univ. into dentate, winglike projection 5 for BLM. 14 May 1981.-202748. 1 0'; 33°48'06"N, 76°34'24"W, 105 m; Duke Univ. for BLM, 14 May 4. Merus of cheliped bispinous on distal outer 1981.-202749. 10'; 33°48'42"N, 76°34'12"W, 102 surface, with lower spine strong and greatly m; Duke Univ. for BLM, 14 May 1981.-202750. 1 extended laterally . 9 Guv.); 33°48'42"N, 76°34'30"W, 99 m; Duke Univ. · Acanthocarpus Stimpson 1871 for BLM, 14 May 1981.-220962. 1 0', 3 9; Merus ofcheliped not bispinous on distal outer 33°48'36"N, 76°34'06"W, 69 m; Duke Univ. for surface, carapace subcircular, small spine at MMS. 4 Mar. 1981. lateral angle Cycloes De Haan 1837 South Carolina: 188682.20', 1 9; 32°18'30"N, 79°00'30"W, 84 m; Dolphin 577096, 3/4 Yankee 5. Pereopod 5 with articles spineless 6 trawl, MARMAP, 9 Mar. 1977.-188677. 10'; 33° Pereopod 5 with row of spines on flexor sur- 17'N, 77°08'42"W, 155 m; Dolphin 573426, 3/4 face of ischium-merus . Yankee trawl, MARMAP, 15 Nov. 1973.-Silver · Paracyclois Miers 1886 Bay stn. 2263. 2 0'; E of Charleston, 33°04'N, 78° 12'W, 29 m; trawl, 28 July 1960. 6. Greatest span of winglike posterolateral pro­ Georgia: 155583. 1 0'; 30 0 50'30"N, 80 0 01'W, 93 jections less than maximal span between m; M. Gray 209, 7 May 1963.-155582. 30'; 30° anterolateral margins; outer proximolateral 55'30"N, 79°57'W, 91-119 m; M. Gray, 12 June corner of palm bearing short, flattened, 1963.-188680.1 undet.; 31°43'30"N, 79°38'30"W, smoothly crested ridge . 64 m; Dolphin 576078, 3/4 Yankee trawl, MAR­ ·................ .. Cyclozodion new genus MAP, 5 May 1976. Greatest span of winglike posterolateral pro­ Florida: 66382. C. saussurei tortugae holotype, 0'; jections exceeding maximal span between Tortugas, about 12 mi S Red no 2 Buoy, 110 m, anterolateral margins; outer proximolateral W. L. Schmitt, stn. 33-31, 22 July 1931.-66381. corner of palm bearing flattened acute spine 19; same.-234461.1 0', 5 9; same.-68506, 68507, or subrectangular ridge . 68508,68509,68515,71369.-101413.60',39; off ·.................... Calappa Weber 1795 Jacksonville, 30 0 11'N, 80 0 17'W, 59 m; Combat stn. 72, 31 Aug. 1956.-101414. 2 0', 1 9; SE Cape Canaveral, 28°32'N. 80 0 05'W, 119 m; Combat stn. Calappa torlugae Rathbun 1933, new rank 90,3 Sept. 1956.-91137. 1 0', 19; W Cape Romano, 25°35'N, 83°42'W, 110 m; Oregon stn. 35, 26 June Figures 1, 2 1950.- 97487.10'; SW Sarasota, 27°07'N, 83°19' W, 42 m; Oregon stn. 963, 4 Apr. 1954.-101678. Calappa. saussurei tortugae Rathbun 1933:183. 10'; S Cape San BIas, 29°10'N, 85°48'W, 101-130 Calappa angusta.-(Part, not selected juveniles.) A. m; Silver Bay stn. 100,26 July 1957.-Silver Bay 106 WILLIAMS and CHILD: COMPARISONS OF SOME BOX CRABS FIGURE l.-Calappa tortugae Rathbun, 0' holotype, USNM 66382: a, carapace, eyes, and part of left cheliped; b, orbital region in frontal view; c, right chela and part of carpus; d, abdomen; e-f, first and second pleopods. 9, USNM 202747: g, abdomen. 107 FISHERY BULLETIN: VOL. 87, NO.1 11 °36'N, 62°54'W, 183 m; dredge, 24 Sept. 1964. MCZ 6654.1 juv.; off Sombrero [Is.], 99 m; labeled .80 as Calappa angusta A.M.E. paratype. .75 Diagnosis. -Carapace convex longitudinally and from side to side; mean length 0.9 times mean width .70 (N = 66); surface elevated in median tract and bran­ chial regions, separated by well-marked furrow at .65 each side running from orbit to level of cardiac region but thereafter becoming obsolescent; covered .60 by prominent, densely and minutely granular pro­ .55 tuberances ofvaried size more or less symmetrical­ ly arranged, with more widely scattered and larger .50 granules between them; arcuate anterolateral mar­ gins finely granulate, with larger granules at inter­ .45 vals; winglike extension with teeth largest at posterolateral angle preceded by up to 4 teeth pro­ .40 gressively diminishing in size anteriorly, and fol­ lowed posteriorly by 2 or 3 smaller teeth successively .35 - diminishing in size, all with beaded edges; mean maximal span between tips of posterolateral teeth .30 slightly greater (1.02) than mean maximal span be­ tween anterolateral margins; axis of largest tooth .25 t on winglike protuberance diverging from midsagit­ tal line at angle of 20-25°.