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Subspecies and Distribution. C.b.baileysMerriam,1894—SWUSAandNWMexicoWofColoradoRiver(SArizona,SWNewMexico,Sonora,andN Sinaloa). C. b. insularis Townsend, 1912 — NW Mexico (Tiburon I, Gulf of California, Sonora). in Heteromyidae

Subspecies and Distribution. C.b.baileysMerriam,1894—SWUSAandNWMexicoWofColoradoRiver(SArizona,SWNewMexico,Sonora,andN Sinaloa). C. b. insularis Townsend, 1912 — NW Mexico (Tiburon I, Gulf of California, Sonora).

Subspecies and Distribution. P.m.mollipilosusCoues,1875—WUSA(SCOregonWoftheColumbiaRiverandNECalifornia). P.m.bullatusDurrant&Lee,1956—SWUSA(restricteddistributioninSEUtah). P.m.clarusGoldman,1917—WUSA(SWMontana,SEIdaho,NEUtah,andSWWyoming). P.m.idahoensisGoldman,1922—WUSA(KingsBowlandWapilavafields,SnakeRiverPlainofSCIdaho). P.m.olivaceusMerriam,1889—WUSA(GreatBasininSCIdaho,Nevada,WUtah,andSECalifornia). P.m.trumbullensisBenson,1937—SWUSA(SWUtahandNWArizona). P. m. xanthanotus Grinnell, 1912 — SW USA (restricted distribution on the Mojave Desert slope of the Tehachapi Mts, S California). in Heteromyidae

Subspecies and Distribution. P.m.mollipilosusCoues,1875—WUSA(SCOregonWoftheColumbiaRiverandNECalifornia). P.m.bullatusDurrant&Lee,1956—SWUSA(restricteddistributioninSEUtah). P.m.clarusGoldman,1917—WUSA(SWMontana,SEIdaho,NEUtah,andSWWyoming). P.m.idahoensisGoldman,1922—WUSA(KingsBowlandWapilavafields,SnakeRiverPlainofSCIdaho). P.m.olivaceusMerriam,1889—WUSA(GreatBasininSCIdaho,Nevada,WUtah,andSECalifornia). P.m.trumbullensisBenson,1937—SWUSA(SWUtahandNWArizona). P. m. xanthanotus Grinnell, 1912 — SW USA (restricted distribution on the Mojave Desert slope of the Tehachapi Mts, S California).

Distribution. CW Ecuador in the W slopes of the Andes (from Rio Esmeraldas and Rio Guayllabamba S to the Cordillera de Chongon-Colonche). in Heteromyidae

Distribution. CW Ecuador in the W slopes of the Andes (from Rio Esmeraldas and Rio Guayllabamba S to the Cordillera de Chongon-Colonche).

Subspecies and Distribution. H.a.anomalusThompson,1815—N&EVenezuela(mainlandandMargaritaI)andTrinidadandTobago(TrinidadI). H.a.brachialisOsgood,1912—NWVenezuela(EofLakeMaracaibo);specimensfromtheSerraniadePerijaalongtheColombian-VenezuelanborderWofLakeMaracaibomaybeassignabletothissubspecies. H.a.hershkovitziHernandez-Camacho,1956—WCColombia(MagdalenaRiverValleyofAndeanregion,forestedslopesoftheEAndes). H. a. jesupiJ. A. Allen, 1899 — N Colombia (Sierra Nevada de Santa Marta, sea level to 610 m). in Heteromyidae

Subspecies and Distribution. H.a.anomalusThompson,1815—N&EVenezuela(mainlandandMargaritaI)andTrinidadandTobago(TrinidadI). H.a.brachialisOsgood,1912—NWVenezuela(EofLakeMaracaibo);specimensfromtheSerraniadePerijaalongtheColombian-VenezuelanborderWofLakeMaracaibomaybeassignabletothissubspecies. H.a.hershkovitziHernandez-Camacho,1956—WCColombia(MagdalenaRiverValleyofAndeanregion,forestedslopesoftheEAndes). H. a. jesupiJ. A. Allen, 1899 — N Colombia (Sierra Nevada de Santa Marta, sea level to 610 m).

Subspecies and Distribution. H.d.desmarestianusGray,1868—SMexico(SofVeracruzandTabasco),Guatemala,Belize,andElSalvador(humidforestedmountainslopesandcoastalplains). H.d.chiriquensisEnders,1938—SECostaRicaandWCPanama(1150-1600m). H.d.crassirostrisGoldman,1912—extremeEPanamaandNWColombia(humidforestedmountainslopesandcoastalplains,1350-1600m). H.d.fuscatusJ.A.Allen,1908—S,W&SEHondurasandCNicaragua. H.d.panamensisGoldman,1912—NCPanama(610-910m). H.d.planifronsGoldman,1937—WCostaRica(lowlands). H.d.repensBangs,1902—SWPanama. H.d.subaffinisGoldman,1937—NECostaRica(lowlands). H.d.temporalisGoldman,1911—SMexicoinCVeracruz(forestedEbasalslopesofmountains,210-460m). H.d.underwoodiGoodwin,1943—CCostaRica(1350-1700m). H. d. zonalis Goldman, 1912 —= NW, C, and into E Panama. in Heteromyidae

Subspecies and Distribution. H.d.desmarestianusGray,1868—SMexico(SofVeracruzandTabasco),Guatemala,Belize,andElSalvador(humidforestedmountainslopesandcoastalplains). H.d.chiriquensisEnders,1938—SECostaRicaandWCPanama(1150-1600m). H.d.crassirostrisGoldman,1912—extremeEPanamaandNWColombia(humidforestedmountainslopesandcoastalplains,1350-1600m). H.d.fuscatusJ.A.Allen,1908—S,W&SEHondurasandCNicaragua. H.d.panamensisGoldman,1912—NCPanama(610-910m). H.d.planifronsGoldman,1937—WCostaRica(lowlands). H.d.repensBangs,1902—SWPanama. H.d.subaffinisGoldman,1937—NECostaRica(lowlands). H.d.temporalisGoldman,1911—SMexicoinCVeracruz(forestedEbasalslopesofmountains,210-460m). H.d.underwoodiGoodwin,1943—CCostaRica(1350-1700m). H. d. zonalis Goldman, 1912 —= NW, C, and into E Panama.

Subspecies and Distribution. H. p. pictus Thomas, 1893 — W, SW, S & SE Mexico (coast of S Nayarit to Chiapas, S Veracruz) and W Guatemala. H. p. annectens Merriam, 1902 — S Mexico (Sierra Madre del Sur of Guerrero and Oaxaca). H. p. hispidusJ. A. Allen, 1897 — NW and W Mexico (N Sonora to Nayarit and CJalisco). H. p. plantinarensis Merriam, 1902 — SC Mexico (interior basins and valleys of SE Jalisco, E Colima, C Michoacan, and N Guerrero). in Heteromyidae

Subspecies and Distribution. H. p. pictus Thomas, 1893 — W, SW, S & SE Mexico (coast of S Nayarit to Chiapas, S Veracruz) and W Guatemala. H. p. annectens Merriam, 1902 — S Mexico (Sierra Madre del Sur of Guerrero and Oaxaca). H. p. hispidusJ. A. Allen, 1897 — NW and W Mexico (N Sonora to Nayarit and CJalisco). H. p. plantinarensis Merriam, 1902 — SC Mexico (interior basins and valleys of SE Jalisco, E Colima, C Michoacan, and N Guerrero).

Subspecies and Distribution. P. f. flavus Baird, 1855 — SW USA and NC Mexico (SE Arizona, New Mexico, N & W Texas, and from NE Sonora and Chihuahua to NC Durango). P. f. bimaculatus Merriam, 1889 — SW USA (WC Arizona). P. f. bunkeri Cockrum, 1951 — SC USA (WC Great Plains of E Colorado, W Kansas, and W Oklahoma). P. f. fuliginosus Merriam, 1890 — SW USA (vicinity of San Francisco Mts and Mogollon Plateau, NC Arizona). P. f. fuscus S. Anderson, 1972 — NW Mexico (upper valley of the Rio Papigochic and watershed of the Laguna Bustillos, WC Chihuahua). P. f. goodpaster: Hoffmeister, 1956 — SW USA (restricted distribution on the Mogollon Plateau of EC Arizona). P. f. hopiensis Goldman, 1932 — SW USA (Four Corners region of SE Utah, SW Colorado, NE Arizona, and NW New Mexico). P. f. medius Baker, 1954 — NC Mexico (SE Durango, SE Coahuila, Zacatecas, W San Luis Potosi, Aguascalientes, NE Jalisco, and Guanajuato). P. f. mexicanus Merriam, 1894 — EC Mexico (Querétaro, Hidalgo, NE Michoacan, Puebla, Distrito Federal, Tlaxcala, WC Veracruz, and Morelos). P. f. pallescens Baker, 1954 — NE Mexico (SE Chihuahua, W Coahuila, and NE Durango). P. f. parviceps Baker, 1954 — WC Mexico (S Zacatecas and N Jalisco). P. f. piperi Goldman, 1917 — NC USA (N Great Plains of E Wyoming and W Nebraska). P. f. sanluisi Hill, 1952 — SW USA (San Luis Valley of SC Colorado). P. f. sonoriensis Nelson & Goldman, 1934 — NW Mexico (disjunct distribution in coastal plains of WC Sonora). in Heteromyidae

Subspecies and Distribution. P. f. flavus Baird, 1855 — SW USA and NC Mexico (SE Arizona, New Mexico, N & W Texas, and from NE Sonora and Chihuahua to NC Durango). P. f. bimaculatus Merriam, 1889 — SW USA (WC Arizona). P. f. bunkeri Cockrum, 1951 — SC USA (WC Great Plains of E Colorado, W Kansas, and W Oklahoma). P. f. fuliginosus Merriam, 1890 — SW USA (vicinity of San Francisco Mts and Mogollon Plateau, NC Arizona). P. f. fuscus S. Anderson, 1972 — NW Mexico (upper valley of the Rio Papigochic and watershed of the Laguna Bustillos, WC Chihuahua). P. f. goodpaster: Hoffmeister, 1956 — SW USA (restricted distribution on the Mogollon Plateau of EC Arizona). P. f. hopiensis Goldman, 1932 — SW USA (Four Corners region of SE Utah, SW Colorado, NE Arizona, and NW New Mexico). P. f. medius Baker, 1954 — NC Mexico (SE Durango, SE Coahuila, Zacatecas, W San Luis Potosi, Aguascalientes, NE Jalisco, and Guanajuato). P. f. mexicanus Merriam, 1894 — EC Mexico (Querétaro, Hidalgo, NE Michoacan, Puebla, Distrito Federal, Tlaxcala, WC Veracruz, and Morelos). P. f. pallescens Baker, 1954 — NE Mexico (SE Chihuahua, W Coahuila, and NE Durango). P. f. parviceps Baker, 1954 — WC Mexico (S Zacatecas and N Jalisco). P. f. piperi Goldman, 1917 — NC USA (N Great Plains of E Wyoming and W Nebraska). P. f. sanluisi Hill, 1952 — SW USA (San Luis Valley of SC Colorado). P. f. sonoriensis Nelson & Goldman, 1934 — NW Mexico (disjunct distribution in coastal plains of WC Sonora).

Subspecies and Distribution. H.i.irroratusGray,1868—SMexico(C&SCOaxaca). H.i.allen:Coues,1881—NC&NEMexico(AltiplanoNofTransverse-MexicanVolcanicBelt,fromSChihuahuatoNMichoacan,DistritoFederal,andTlaxcala,andNSierraMadreOrientalinCNuevoLeonandSWTamaulipas). H.i.buller:Thomas,1893—WCMexico(WCJalisco). H.i.guerrerensisGoldman,1911—SWMexico(PacificslopeofSierraMadredelSur,WGuerrero). H.i.jaliscensisJ.A.Allen,1906—WCMexico(S,C&NJalisco,SZacatecas,andSNayarit). H.i.texensisMerriam,1902—SUSAandNEMexico(extremeSTexastoNPueblaandCVeracruz). H. i. tornidus Merriam, 1902 — S Mexico (S of the Transverse-Mexican Volcanic Belt in S Puebla, Morelos, NE Guerrero, and N Oaxaca). in Heteromyidae

Subspecies and Distribution. H.i.irroratusGray,1868—SMexico(C&SCOaxaca). H.i.allen:Coues,1881—NC&NEMexico(AltiplanoNofTransverse-MexicanVolcanicBelt,fromSChihuahuatoNMichoacan,DistritoFederal,andTlaxcala,andNSierraMadreOrientalinCNuevoLeonandSWTamaulipas). H.i.buller:Thomas,1893—WCMexico(WCJalisco). H.i.guerrerensisGoldman,1911—SWMexico(PacificslopeofSierraMadredelSur,WGuerrero). H.i.jaliscensisJ.A.Allen,1906—WCMexico(S,C&NJalisco,SZacatecas,andSNayarit). H.i.texensisMerriam,1902—SUSAandNEMexico(extremeSTexastoNPueblaandCVeracruz). H. i. tornidus Merriam, 1902 — S Mexico (S of the Transverse-Mexican Volcanic Belt in S Puebla, Morelos, NE Guerrero, and N Oaxaca).

Subspecies and Distribution. P.f.flavescensMerriam,1889—CUSA(WCGreatPlains,SWSouthDakota,andSEWyomingtoEColoradoandSEKansas). P.f.apacheMerriam,1889—SWUSA(NEArizona,SEUtah). P.f.caryiGoldman,1918—SWUSA(E&SEUtah,W&SWColorado,NEArizona,andNW&CNewMexico). P.f.cockrumiHall,1954—SCUSA(CKansastoSCOklahoma). P.f.copeiRhoads,1894—SCUSA(WOklahoma,WTexas,andENewMexico). P.f.melanotisOsgood,1900—SWUSAandNMexico(SEArizona,CNewMexico,extremeWTexas,andNChihuahua). P.f.pernigerOsgood,1904—NCUSA(SENorthDakota,SWMinnesotatoNENebraskaandNWMissouri). P. f. relictus Goldman, 1938 — SW USA (San Luis Valley, SC Colorado). in Heteromyidae

Subspecies and Distribution. P.f.flavescensMerriam,1889—CUSA(WCGreatPlains,SWSouthDakota,andSEWyomingtoEColoradoandSEKansas). P.f.apacheMerriam,1889—SWUSA(NEArizona,SEUtah). P.f.caryiGoldman,1918—SWUSA(E&SEUtah,W&SWColorado,NEArizona,andNW&CNewMexico). P.f.cockrumiHall,1954—SCUSA(CKansastoSCOklahoma). P.f.copeiRhoads,1894—SCUSA(WOklahoma,WTexas,andENewMexico). P.f.melanotisOsgood,1900—SWUSAandNMexico(SEArizona,CNewMexico,extremeWTexas,andNChihuahua). P.f.pernigerOsgood,1904—NCUSA(SENorthDakota,SWMinnesotatoNENebraskaandNWMissouri). P. f. relictus Goldman, 1938 — SW USA (San Luis Valley, SC Colorado).

Subspecies and Distribution. C.a.arenariusMerriam,1894—NWMexico(fromnearLagunaSanIgnacioStoWofBahiadelaPaz,BajaC.a.Sur). C.a.albescensHuey,1926—NWMexico(GulfcoastinvicinityofSanFelipe,BajaC.a.forniaSur). C.a.albulusNelson&Goldman,1923—NWMexico(MagdalenaI,BajaC.a.Sur). C.a.ambiguusNelson&Goldman,1929—NWMexico(ValledelosCirios,SBajaC.a.fornia,andVizcainoDesert,NBajaC.a.Sur). C.a.helleriElliot,1903—NWMexico(SanQuintinPlain,NWBajaC.a.). C.a.mexicalisHuey,1939—NWMexico(WsideofLagunaSalada,NEBajaC.a.). C.a.paraliosHuey,1964—NWMexico(GulfcoastofSEBajaC.a.). C.a.ramirezpulidoiAlvarez-Castanieda&Cortés-Calva,2004—NWMexico(ElMagotesandspit,BahiadelaPaz,BajaC.a.Sur). C. a. sabulosus Huey, 1964 — NW Mexico (Bahia de Santa Rosaliita, Baja C.a., S through the W Vizcaino Desertto the vicinity of the Laguna San Ignacio, Baja C.a. nia Sur). in Heteromyidae

Subspecies and Distribution. C.a.arenariusMerriam,1894—NWMexico(fromnearLagunaSanIgnacioStoWofBahiadelaPaz,BajaC.a.Sur). C.a.albescensHuey,1926—NWMexico(GulfcoastinvicinityofSanFelipe,BajaC.a.forniaSur). C.a.albulusNelson&Goldman,1923—NWMexico(MagdalenaI,BajaC.a.Sur). C.a.ambiguusNelson&Goldman,1929—NWMexico(ValledelosCirios,SBajaC.a.fornia,andVizcainoDesert,NBajaC.a.Sur). C.a.helleriElliot,1903—NWMexico(SanQuintinPlain,NWBajaC.a.). C.a.mexicalisHuey,1939—NWMexico(WsideofLagunaSalada,NEBajaC.a.). C.a.paraliosHuey,1964—NWMexico(GulfcoastofSEBajaC.a.). C.a.ramirezpulidoiAlvarez-Castanieda&Cortés-Calva,2004—NWMexico(ElMagotesandspit,BahiadelaPaz,BajaC.a.Sur). C. a. sabulosus Huey, 1964 — NW Mexico (Bahia de Santa Rosaliita, Baja C.a., S through the W Vizcaino Desertto the vicinity of the Laguna San Ignacio, Baja C.a. nia Sur).

Subspecies and Distribution. C.f.fallaxMerriam,1889—SWUSAandNWMexico(PacificcoastsideofSanBernardinoMts,SWCaliforniaStoSierraJuarez,NBajaCalifornia). C.f.anthonyiOsgood,1900—NWMexico(CedrosI,BajaCalifornia). C.f.inopinusNelson&Goldman,1929—NWMexico(PacificcoastofSBajaCalifornia) . C.f.majusculusHuey,1960—NWMexico(PacificcoastofCBajaCalifornia). C.f.pallidusMearns,1901—SWUSA(SMojaveDeserttoCalifornia—BajaCalifornia border). C. f. xerotrophicus Huey, 1960 — NW Mexico (C Baja California). in Heteromyidae

Subspecies and Distribution. C.f.fallaxMerriam,1889—SWUSAandNWMexico(PacificcoastsideofSanBernardinoMts,SWCaliforniaStoSierraJuarez,NBajaCalifornia). C.f.anthonyiOsgood,1900—NWMexico(CedrosI,BajaCalifornia). C.f.inopinusNelson&Goldman,1929—NWMexico(PacificcoastofSBajaCalifornia) . C.f.majusculusHuey,1960—NWMexico(PacificcoastofCBajaCalifornia). C.f.pallidusMearns,1901—SWUSA(SMojaveDeserttoCalifornia—BajaCalifornia border). C. f. xerotrophicus Huey, 1960 — NW Mexico (C Baja California).

Subspecies and Distribution. C.a.ammophilusOsgood,1907—NWMexico(restrictedtoSantaMargaritaI,SWBaja C.a. Sur). . C.a.dalquestiRoth,1976—NWMexico(SPacificcoastandC.a.RegionofBajaC.forniaSur). C. a. sublucidus Nelson & Goldman, 1929 — NW Mexico (coast S & E of the Bahia de la Paz, except the El Magote sand spit, S Baja C.a. Sur). in Heteromyidae

Subspecies and Distribution. C.a.ammophilusOsgood,1907—NWMexico(restrictedtoSantaMargaritaI,SWBaja C.a. Sur). . C.a.dalquestiRoth,1976—NWMexico(SPacificcoastandC.a.RegionofBajaC.forniaSur). C. a. sublucidus Nelson & Goldman, 1929 — NW Mexico (coast S & E of the Bahia de la Paz, except the El Magote sand spit, S Baja C.a. Sur).

Subspecies and Distribution. P.f.fasciatusWied-Neuwied,1839—SCCanadaandCUSA(GreatPlainsfromSEAlberta,SSaskatchewan,SWManitoba,MontanaandNorthDakotatoMinnesotaborder,andStoWyomingandSCColorado). P. f. callistus Osgood, 1900 — WC and SW USA (Uintah, Bridger, and Great Divide basins of SW Wyoming, NE Utah, and NW Colorado). in Heteromyidae

Subspecies and Distribution. P.f.fasciatusWied-Neuwied,1839—SCCanadaandCUSA(GreatPlainsfromSEAlberta,SSaskatchewan,SWManitoba,MontanaandNorthDakotatoMinnesotaborder,andStoWyomingandSCColorado). P. f. callistus Osgood, 1900 — WC and SW USA (Uintah, Bridger, and Great Divide basins of SW Wyoming, NE Utah, and NW Colorado).

Subspecies and Distribution. P.a.amplusOsgood,1900—SWUSAandNWMexico(C&SWArizona,NWSonora). P.a.cinerisBenson,1933—SWUSA(NCArizona). P.a.pergracilisGoldman,1932—SWUSA(NWArizona). P. a. taylori Goldman, 1932 — SW USA and NW Mexico (SC Arizona, NW Sonora). in Heteromyidae

Subspecies and Distribution. P.a.amplusOsgood,1900—SWUSAandNWMexico(C&SWArizona,NWSonora). P.a.cinerisBenson,1933—SWUSA(NCArizona). P.a.pergracilisGoldman,1932—SWUSA(NWArizona). P. a. taylori Goldman, 1932 — SW USA and NW Mexico (SC Arizona, NW Sonora).

Subspecies and Distribution. H.s.salviniThomas,1893—SGuatemala,ElSalvador,NW&SCHonduras,WCNicaragua(includingOmetepeIinLakeNicaragua),andW&CCostaRica. H.s.crispusMerriam,1902—SMexico(coastalSEOaxacaandSChiapas)andcoastalSWGuatemala. H. s. vulcani]. A. Allen, 1908 — W Nicaragua (volcanoes of the Cordillera los Marrabios and W lowlands, W of Lake Managua, the Meseta de los Pueblos W of Lake Nicaragua, and on Zapatera I in Lake Nicaragua). in Heteromyidae

Subspecies and Distribution. H.s.salviniThomas,1893—SGuatemala,ElSalvador,NW&SCHonduras,WCNicaragua(includingOmetepeIinLakeNicaragua),andW&CCostaRica. H.s.crispusMerriam,1902—SMexico(coastalSEOaxacaandSChiapas)andcoastalSWGuatemala. H. s. vulcani]. A. Allen, 1908 — W Nicaragua (volcanoes of the Cordillera los Marrabios and W lowlands, W of Lake Managua, the Meseta de los Pueblos W of Lake Nicaragua, and on Zapatera I in Lake Nicaragua).

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Using 2D dental geometric morphometrics to identify modern Perognathus and Chaetodipus specimens (Rodentia, Heteromyidae)

The Heteromyidae (pocket mice and kangaroo rats) are a group of extant small rodents abundant in western North America, as well as in fossil assemblages over the last 20 million years. Two genera of heteromyids, Chaetodipus and Perognathus, share similar tooth morphology and teeth are the primary fossil remains. Previous genetic studies show these extant sister genera likely diverged in the middle Miocene (~16 million years ago); however, the Chaetodipus fossil record starts in the Pleistocene (~2 million years ago). In this study, we asked whether two-dimensional geometric morphometrics on complete dentition and isolated premolars can accurately identify Chaetodipus and Perognathus specimens at the genus and species level. We landmarked the occlusal surface of the upper and lower tooth rows of modern Chaetodipus (n = 83) and Perognathus specimens (n = 80), including 12 of the 26 extant species across the two genera. We ran a canonical variates analysis to investigate whether principal component variation could predict known taxonomic identifications. The morphospace using complete dentition can identify specimens to genus with 90 – 92% accuracy and to species with more variable accuracy. We found an isolated premolar provides sufficient information for genus-level identification (69 – 84% accuracy), but not for species-level identification (26 – 56% accuracy). This morphospace of modern specimens can be used to identify the skeletal remains of Chaetodipus and Perognathus in museum collections, raptor pellets, or middens, to refine our existing knowledge of heteromyid evolutionary history.

FIGURE 9 in Helminths of small rodents (Heteromyidae and Cricetidae) in the Yucatan Peninsula, Mexico: an integrative taxonomic approach to their inventory

FIGURE 9. Phylogenetic tree based on the ML analysis constructed on partial large subunit ribosomal gene (28S) of Syphacia species from different hosts. Individual GenBank accession numbers precede species name, followed by host name. Bootstrap support values for ML are provided at the nodes. The new sequences of the present study are in bold.

FIGURE 5. A in Helminths of small rodents (Heteromyidae and Cricetidae) in the Yucatan Peninsula, Mexico: an integrative taxonomic approach to their inventory

FIGURE 5. A. SEM micrograph of cephalic plate of female Syphacia peromysci from Peromyscus yucatanicus, apical view. B. SEM micrograph of anterior extremity of female Syphacia peromysci from Peromyscus yucatanicus showing the cervical alae (arrow), ventral view. C. SEM micrograph of complete male of Syphacia peromysci from Peromyscus yucatanicus showing the mamelons (arrows), lateral view. D. Caudal extremity of male Syphacia peromysci from Peromyscus yucatancus showing the caudal papillae (arrows), lateral view. E. Egg of Syphacia peromysci from Peromyscus yucatanicus, lateral view. F. Cephalic plate of female Syphacia sp. (1) from Heteromys gaumeri, apical view. G. Egg of Syphacia sp. (1) from Heteromys gaumeri, lateral view. Cephalic plate of female Syphacia sp. (2) from Reithrodontomys gracilis showing the cervical alae (arrow), apical view. I. Egg of Syphacia sp. (2) from Reithrodontomys gracilis, lateral view. J. SEM micrograph of cephalic plate of female Syphacia sp. (3) from Ototylomys phyllotis, apical view. K. Anterior extremity of female Syphacia sp. (3) from Ototylomys phyllotis showing the isthmus (arrow), ventral view. L. SEM micrograph of anterior extremity of Syphacia sp. (3) from Ototylomys phyllotis showing the lateral folds (arrow), lateral view. M. Egg of Syphacia sp. (3) from Ototylomys phyllotis, lateral view. N. SEM micrograph of the anterior section of female Syphacia sp. (4) from Ototylomys phyllotis showing the cuticle with transverse striations and shallow longitudinal depressions, lateral view. O. SEM micrograph of cephalic plate of female Syphacia sp. (4) from Ototylomys phyllotis, apical view. P. Anterior extremity of female Syphacia sp. (4) from Ototylomys phyllotis showing the deirids (arrow), ventral view.

FIGURE 8 in Helminths of small rodents (Heteromyidae and Cricetidae) in the Yucatan Peninsula, Mexico: an integrative taxonomic approach to their inventory

FIGURE 8. Phylogenetic tree based on the ML analysis constructed on partial large subunit ribosomal gene (28S) of strongylids from different hosts. Individual GenBank accession numbers precede species name, followed by host name. Bootstrap support values for ML are provided at the nodes. The new sequences of the present study are in bold.

FIGURE 2. A in Helminths of small rodents (Heteromyidae and Cricetidae) in the Yucatan Peninsula, Mexico: an integrative taxonomic approach to their inventory

FIGURE 2. A. Adult specimen of Scaphiostomum sp. from Heteromys gaumeri, ventral view. B. Adult specimen of Skrjabinus sp. from Heteromys gaumeri, ventral view. C. SEM micrograph of Skrjabinus sp. from Heteromys gaumeri showing the ventral surface and the acetabulum, ventral view. D. Adult specimen of Microphallidae gen. sp. from Peromyscus yucatanicus, ventral view.