THE IMPORTANCE OF ITABORAÍ BASIN (PALEOCENE) AS THE HOME TO EARLY RECORDS OF MANY PULMONATE SNAIL FAMILIES Rodrigo Brincalepe Salvador¹ ^$:C0:RQ`8`QR`1$Q8G$I:1C8HQI_ , Luiz Ricardo Lopes de Simone¹ ^C`$1IQJV%$]8G`_ ¹Universidade de São Paulo, Museu de Zoologia (MZUSP) RESUMO INTRODUCTION Os calcários da Bacia de Itaboraí The limestone formation of the Itaboraí (Paleoceno Médio a Superior), Rio de Janeiro, Basin at São José de Itaboraí, Rio de Janeiro, Brasil, são famosos por sua abundante fauna ,4#&65#-5..,5%()1(535#.-5/((.5'''&#(5 de mamíferos, mas também possuem uma rica fauna (Bergqvist et al 865hfflC85)10,65."#-5.#(35 fauna de 17 espécies de gastrópodes pulmonados. -#(5&-)5",),-55,#"5 /(5) 51&&7*,-,05 Os registros fósseis mais antigos das famílias pulmonate snails: 18 species have been described Orthalicidae e Strophocheilidae são de Itaboraí. .)5 .65 '#(&35 #(5 /&#'/&#I,."&##5 Cerionidae, Clausiliidae, Ellobiidae e Urocoptidae B#!85 g:5 #')(5 ;5 44&#,65 goojC85 )&&)1#(!5 não possuem representantes vivos que chegam tão mammal correlations, the Itaboraí limestones are ao sul da América do Sul como no Rio de Janeiro; ()15 !,5 .)5 5 ) 5 **,5 &)(5 &.")/!"5 além disso, os registros de Charopidae, Clausiliidae, the S1 stratigraphic sequence sensu Medeiros Cerionidae, Urocoptidae e Vertiginidae estão ;5 ,!+0#-.5 BgoooC65 1",5 &&5 ')&&/--5 (5 5 entre os mais antigos conhecidos no mundo. found, has been considered as Middle Paleocene Considerando esse registro tão diverso, é estranho (Medeiros & Bergqvist, 1999). Some of the que essa fauna seja pouco conhecida, já que pode molluscan species found in sequence S1 can also ajudar a responder diversas perguntas sobre 5 )/(5#(5-+/(5h651",5."5'$),#.35) 5 biogeografia e sistemática. the mammalian fauna is (Bergqvist et al ., 2006). Palavras-chave: Biogeografia, Pulmonata, .),ù]-5,&35()4)#5!5(5&).#)(5'%5 Rio de Janeiro its fossils critical in understanding the evolution of South American taxa and their biogeographic ABSTRACT "#-.),385 "5 .),#(5 /(5 *,-(.-5 -)'5 ) 5 the first record for extant molluscan families The limestones of Itaboraí Basin (Middle (5,),-5) 5*-.5#-.,#/.#)(51",5."5&#0#(!5 to Upper Paleocene), Rio de Janeiro, Brazil, are ,&.#0-5(5().55 )/(5.)35(3'),8 famous for the abundant mammalian fauna, /.5 ."35 &-)5 ",),5 5 ,#"5 /(5 ) 5 gm5 -*#-5 THE PULMONATE FAMILIES of pulmonate snails. The oldest fossil records of the families Orthalicidae and Strophocheilidae OF ITABORAÍ BASIN are from Itaboraí. Cerionidae, Clausiliidae, 95 ,#)(#5 1-5 ().5 Ellobiidae and Urocoptidae do not have living *,-(.5#(5 .),ù5-#(5/(.#&5,(.&3955,0#-#)(5 representatives so far south in South America ) 5."5!(/-5,-#&((65 ),',&35#(5.,*.2#65 -5 #)5 5 (#,):5 #.#)(&&365 ."5 ,),-5 ) 5 has placed it in Cerionidae and made it the second Charopidae, Clausiliidae, Cerionidae, Urocoptidae !(/-5#(5."5 '#&35-#-5,#)(5B&0),5et al ., (5,.#!#(#5,5')(!5."5)&-.5%()1(5#(5 -/'#..C85",5,5.1)5,-#&((5-*#-5#(5 ."51),&85)(-#,#(!5-/"5#0,-5,),65#.5#-5 .),ù5B5."#,5)(51-5,(.&35 )/(:5&0),5 -.,(!5 .".5 ."#-5 /(5 #-5 ().5 1&&5 %()1(5 -#(5 ;5 #')(65 #(5 *,*,.#)(C6585 ,."/-5 /,365 #.5 (5 "&*5 (-1,#(!5 '(35 #)!)!,*"35 (5 1935 (Fig. 1A) and B. minor (Trindade, 1956) -3-.'.#-5+/-.#)(-8 B#!85gC65/.5."5 #,-.5 )--#&5,),5) 5."5 '#&35 Keywords: #)!)!,*"365/&')(.65#)5 is a probable Cerion acherontis from the Upper de Janeiro Cretaceous of Montana, USA (Roth & Hartman, goonC85 0(5 # 5 ,-#&((5 #-5 ().5 ."5 '#&3]-5 fluminensis (Brito, 1967) (Fig. 1M), a record inside #,-.5,),65#.5#-5(5#(.,-.#(!5,),5)(5#.-5)1(5 the distribution of living representatives of the ),5 .),ù5-#(5#-5 ,5 ,)'5."5 '#&3]-5,(.5 '#&385&(),#5"-5(52.(-#05 )--#&5,),65 distribution, i.e., southernmost North America ."5)&-.5#(!5 ,)'5."5 /,--#5) 53)'#(!65 (islands south of Florida) and the Caribbean USA (Yen & Reeside, 1946); although Meier- Islands. Brook (1984) considers planorbid fossils earlier CHAROPIDAE: Austrodiscus lopesi than Cenozoic as doubtful. ,,#,5;5)&")65gono51-5),#!#(&&35&--# #5 STROPHOCHEILIDAE: Eoborus -5())(.#5/.65-5."5!(/-51-5.,(- ,,5 sanctijosephi B /,365goikC5B#!85gC5#-5/,,(.&35 to Charopidae (Fonseca & Thomé, 1993), so is ."5 )(&35 -.,)*")"#&#5 -*#-5 #(5 .),ù5 this species. This record is the second oldest (another Eoborus 5 -*#-5 1-5 ,(.&35 )/(:5 %()1(5 ),5."5 '#&35B."5)&-.5#(!5 ,)'5."5 Salvador & Simone, in preparation) and represents Cretaceous of Argentina; Morton, 1999) and ."5 '#&3]-5)&-.5,),5.)!.",51#."5Eoborus .),ù]-5&)&#.35#-5-&#!".&35) 5.)5."5-.5) 5."5 charruanus , a species from the Paleocene of '#&3]-5 ,(.5 #-.,#/.#)(5 B."5 ',#-65 .85 ,/!/350,35-#'#&,5to E. sanctijosephi (Martínez Helena Island, southern Africa, the Asian Pacific et al 865goomC85"-5,),-5 &&51#."#(5."5 '#&3]-5 Islands and Oceania). recent distribution. 95 "5 )(&35 &/-#&##5 95 "5 )(&35 /,))*.#5 from Itaboraí is Clausilia m agalhaesi Trindade, %()1(5#(5 .),ù5#-5Brachypodella britoi Ferreira goki5B#!85gC655,),5.".5#-5-)'1".5,')05 ;5 )&")65 gomg5 B#!85 gC65 ")10,5 ."5 )&-.5 ,)'5."5*,-(.5#-.,#/.#)(5) 5."5 '#&35B."5 ,),-5 ) 5 ."5 '#&35 )'5 ,)'5 ."5 **,5 South American species are restricted to the Cretaceous of Canada and Mexico (Tozer, 1956; (),."1-.,(5*,.5) 5."5)(.#((.C85"5 '#&35 Perrilliat et al ., 2000). Still, B. britoi is a record far #-5%()1(5-#(5."5,.)/-5) 5/,)*5B)&'65 135 ,)'5.".5) 5,(.5/,))*.#-5B-)/.",(')-.5 1976), but this is the oldest record for South North America, Central America, the Caribbean America. Islands, and northernmost South America). ELLOBIIDAE: Carychium sommeri VERTIGINIDAE: Vertigo mezzalirai ,,#,5 ;5 )&")65 gomg5 B#!85 gC5 #-5 ."5 )(&35 Ferreira & Coelho, 1971 (Fig. 1P). Vertiginidae &&)##5 #(5 .),ù5 (5 #.]-5 )/.-#5 ."5 '#&3]-5 "-5 5 1),&1#5 #-.,#/.#)(5 (5 ,(.5 -*#-5 recent distribution, since there are no extant )/,5 #(5 ,4#&85"5 '#&35 #-5 %()1(5 -#(5 ."5 &&)##5#(5,4#&85"5 '#&35#-5%()1(5-#(5."5 Cretaceous of Japan (Isaji, 1976), but this is the Jurassic of USA and Europe (Yen & Reeside, oldest record for South America. 1946; Solem, 1976). 95 "#-5 '#&35 -")1-5 CONCLUSION 5 2.(-#05 ,),5 #(5 .),ù65 1#."5 &')-.5 "& 5 The oldest fossil records of the families of the basin’s fauna: Bulimulus fazendicus 5 /,365 1935 (Fig. 1E), B. fe rreirai Palma & Brito, 1974 Orthalicidae and Strophocheilidae comes from (Fig. 1F), B. sommeri Palma & Brito, 1974 (Fig. the limestones of Itaboraí Basin. Cerionidae, 1G), Itaborahia carvalhoi (Brito, 1967) (Fig. 1H), Clausiliidae, Ellobiidae, Urocoptidae do not have I. coelhoi (Palma & Brito, 1974) (Fig. 1I), I. lamegoi living representatives reaching so far south in I. trinda deae (Ferreira & South America as Rio de Janeiro. Moreover the /,365goik5B#!85g C65 records of Charopidae, Clausiliidae, Cerionidae, )&")65gomgC5B#!85g C85#.#)(&&3655*)--#&5 Urocoptidae and Vertiginidae are among the Cyclodontina 5 1-5 )/(5 ,(.&35 B&0),5 ;5 Simone, in preparation). The records are the )&-.5 %()1(5 #(5 ."5 1),&85 )(-#,#(!5 -/"5 5 vast and diverse record of pulmonates in Itaboraí, )&-.5%()1(5 ),5."5 '#&35(5 &&51&&51#."#(5 its current distribution. #.5#-5-.,(!5.".5."#-5 /(5#-5().51&&5%()1(5(5 95 ",5 ,5 .1)5 #.5#-50(5#!(),5#(5-)'51),%-5&#(!51#."5."5 planorbids in Itaboraí Biomphalaria itaboraiensis )--#&5,),5) 5."50,35 '#&#-5*,-(.5#(5 .),ù85 (Mezzalira, 1946) (Fig. 1L) and Vorticifex "5-#(]-5 )--#&5,),5#-5,#"5()/!"5.)5(-1,5 '(35+/-.#)(-5) 5')&&/-(5*&)#)!)!,*"35 MORTON, L.S. 1999. El genero Radiodiscus (5-3-.'.#-8 (Gastropoda-Endodontoidea) en el Cretacico temprano, provincia de Santa REFERENCES Cruz Argentina. Revista da Universidade de Guarulhos (Geociencias) IV(6): 46-49. 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