A new triphorid species (Gastropoda, Triphoridae) from Nichupté lagoon, Yucatán peninsula, Mexico

6 Pages·1996·1.9 MB·English

by  Emilio Rolán

IBERUS,13 (2):87-92, 1995
A new triphorid species (Gastropoda, Triphori-
dae) from Nichupté lagoon, Yucatán península,
México
Un nuevo trifórido (Gastropoda, Triphoridae) de la
laguna costera Nichupté, península del Yucatán, México
Emilio ROLAN* and Flor M. CRUZ-ÁBREGO**
ABSTRACT
A new species of triphorid, Marshallora nichupté spec. nov., is described from the
Nichupté-Bojórquez Lagoons (Yucatán Península, México), probably being endemic to
thisárea. The newspecies iscomparedwith otherCaribbean speciesofthisfamily.
RESUMEN
Sedescribe una nuevaespeciedetrifórido, Marshalloranichuptéspec. nov., de las lagu-
nas costeras de Nichupté-Bojórquez (Península de Yucatán, México), probablemente
endémicadeestazona. Secomparacon otras especiesdel Caribede estafamilia.
KEYWORDS:Gastropoda,Triphoridae,Yucatán,México.
PALABRASCLAVE:Gastropoda,Triphoridae,Yucatán,México.
INTRODUCTION
TheYucatánpenínsula is considered nados (1994) and Cruz-Ábrego and
withinthebiogeographicárea oftheCa- Flores-Andolais (1994). Triphora nigro-
ribbean. The triphorids from theCarib- cincta is the onlytriphorid mentioned in
beanhavebeenthesubjectofsomerecent them.
studies, even with the addition of new After the study of the material
species, as the papers of De Jong and collected by the second author in the
coomans (1988),moolenbeekandfa- Nichupté and Bojórquez Lagoons from
ber (1989), Faber and Moolenbeek 1991 to 1994, a triphorid different from
(1991), RolanandFernández-Garcés, those previously studied and described
(1993a,1993b,1994,and1995)andRolan in the Western Atlantic fauna has been
and Espinosa (1994). TheNichupté La- found. This species was considered ini-
goon, Quintana Roo, México, has been tially as Triphora nigrocincta, but further
the subjectofsomefaunisticinventories studies showed it was not this taxon,
madebyCarnes (1975), Cruz-Ábrego, and so it is here described as a new
Flores-AndolaisandToledano-Gra- species.
*MuseoGalegodoMar,CánovasdelCastillo,22, 36202,Vigo,España.
**InstitutodeCienciasdelMaryLimnología,UNAM,EstaciónPuertoMorelos,Apartado 1152,Cancún,
77500,QuintanaRoo,México.
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IBERUS, 13 (2), 1995
Informationaboutthecollectingárea MCZ: Museum of Comparative Zoology,
and the methods employed can be seen Cambridge.
inCruz-Ábregoetal. (1994). MNCN: Museo Nacionalde Ciencias Natu-
rales,Madrid.
Abbreviationsused: MNHN:MuseumNationald'HistoireNatu-
relle,Paris.
AMNH: American Museum of Natural UNAM: Instituto de Ciencias del Mar y
History,NewYork. Limnología, Estación de Puerto More-
BMNH:TheNaturalHistoryMuseum,London. los.
CER:E.Rolancollection,Vigo. USNM: National Museum ofNatural His-
ÍES: Instituto de Ecología y Sistemática, La tory,Washington.
Habana. ZMA:ZoólogischMuseum,Amsterdam.
RESULTS
FamilyTriphoridae Gray, 1847
SubfamilyTriphorinae Gray, 1847
GenusMarshallora Bouchet, 1984
Marshallora nichupte spec. nov.
Typematerial: Morethan 150specimensand shellshavebeencollected inlessthantwometres
ofdepthandareincludedinthepresentstudy.Holotype(Fig.2),MNCNnQ15.05/18726,4.6mm
length,fromtheNichupteLagoon.Twoparatypesfromthesamelocalitytobedepositedineach
oneofthefollowingcollections: AMNH,BMNH,ÍES,MCZ,MNHN,USNMandZMA;40more
inCER;therestoftheparatypesareinthecollectionoftheUNAM.
Etymology:Thespecificñamealludestothetypelocality.
Description: Shell (Figs. 1-9) of 3.5- defined spiral cords and axial costae,
mm mm
5.0 in length, 1.2-1.8 in width, nodular intersections, suture shallow
with 9-12 whorls, narrowly conical, but well-defined. No microsculpture is
spireabout4timeshigherthan aperture visible even with high magnification.
pluscanal. Four spiral cords on body whorl and
Colour very variable: most fre- two on the base, 4th spiral cord partly
quently, darkbrown with darker suture exposed at suture. lst and 3rd spiral
and base; lighter in apex (Figs. 1-2); cords commencing immediately, 3rd
sometimes, between light brown to being more prominent; 2nd spiral cord
cream (Fig. 3) even with the suture of appearing as a thread between 2nd and
thesamecolour,butusuallywithadark 4th teleoconch whorl, gradually enlar-
base. Someemptyshellswereuniformly ging to resemble lst spiral by about 5th
white (Fig. 4), perhaps by decoloration, whorl. lst - 3rd spiral cords strongly no-
but a few specimens collected alive dular, 4th spiral more weakly nodular,
were also puré white (Fig. 5). In brown 5th- 6th smooth. Narrow axial costae di-
shells, the intersection nodules are fre- sappearing below 3rd spiral cord, there
quentlylighter. being 22-29 on body whorl. Base con-
Protoconch (Fig. 11-13) paucispiral, tracted. Aperture subquadrangular. Ou-
ofabout 1 !/4- 2 convex whorls, diame- ter lip sharp, thin and lighter in colour.
ter 0.370-0.450 mm, diameter of first Posterior siphonal notch very small or
whorl 0.220-0.350 mm. No sculpture imperceptible. Inner lip thick. Anterior
exceptforafewprominentgrowthlines. siphonalcanalveryshortandopen.
Teleoconchwhorls flat-sided orvery Animal, ofthe preserved material in
shallowly convex, sometimes slightly alcohol,white.
butdistinctlyangulateatspiral3,reticu- Operculum translucent white, mul-
lately sculptured with prominent, well- tispiralandwithoutprominences.
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Rolanand Cruz-Ábrego: Anew triphoridfrom Yucatán, México
Figures 1-9.Marshalloranichupte spec. nov. 1: paratypeofbrowncolour(AMNH); 2: holoty-
pe (MNCN) ofbrowncolour; 3: paratypeofcreamcolour(CER); 4: paratype ofwhitecolour,
collected empty (UNAM); 5: paratype ofwhite colour, collected alive (CER); 6-9: paratypes
(CER) (6and8ofbrowncolourand7and9ofcreamcolour). Scalebars 1 mm.
Figuras1-9. Marshalloranichuptespec.nov. 1:paratipodecolormarrón(AMNH);2:holotipo
(MNCN)decolormarrón;3:paratipodecolorcrema(CER);4:paratipodecolorblanco,con-
chavacía(UNAM);5:paratipodecolorblanco,recolectadovivo(CER);6-9:paratipos(CER)
(6y8decolormarróny 7y9decolorcrema).Escalas1 mm.
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IBERUS, 13 (2), 1995
Figures 10-13. Marshallora nichupte spec. nov. 10: radula; 11-13: protoconchs (11 and 13
shellsofbrowncolour; 12 shell ofwhitecolour; allparatypes in CER). Scalebars, 10: 10 um;
11-13: 100 um.
Figuras10-13. Marshalloranichuptespec. nov. 10:rádula;11-13:protoconchas(11y13,con-
chasdecolormarrón;12,conchadecolorblanco,todosparatiposenCER).Escalas,10:10 fi
m; 11-13: 100 ¡tm.
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RolanandCruz-Ábrego: A new triphoridfrom Yucatán, México
Radula(Fig. 10)withformula(5-6)-1- (C. B. Adams, 1839) orM. modesta (C. B.
1-1- (5-6). Central tooth typical of the Adams,1850),butthesespecieshavemul-
genus,withtwogroupsof4-6sharpcusps. tispiralprotoconchs.Thespeciesmentio-
Thenumberofcuspsmaychangewithin ned by Carnes (1975) as Triphora nigro-
an individual and may be asimetric. cincta and Triphora sp. are probablyM.
Lateralteethverysimilar,withtwogroups nichupte,becausetheauthordescribedits
of5-6cusps.Marginalteethnarrow,elon- "1V2globose,smooth,glassy,lightbrown
gatedandcurved. whorlsofprotoconch".
"Triphora" bartschiOlsson, 1916,was
Distributionandtype locality: Only describedwith2-3whorlsofprotoconch,
known from the type-locality, Bojór- smooth inthe initialportion, with three
quez-Nichupté Lagoons, Cancún, Quin- strongspiralcordsinthemiddlepartand
tanaRoo,México. twoonthefinalportion.Thisfossilspecies
isonlyknownfromYorktownandDuplin
Remarks: Marshallora nichupte spec. Miocene of Virginia and the Carolinas
nov.ismorevariableincolour,andthere (OlssonandHarbison, 1953).
arenotdifferences in therest ofthecha- T. nichuptespec.nov.ismorevariable
racters, including the radula, between in colour than any other triphorid
the specimens with brown or white species known from the Caribbean Sea,
shells.Also,thisspecieshasaveryvaria- being also different from those species
ble size of protoconch, but there are with little paucispiral protoconchs:
intergrades and no other characters are "Triphora" calva Faber and Moolenbeek,
associatedwiththesedifferences. 1991 is always brown and it has smaller
The generic position ofM. nichupte protoconch with a spiral angulation
spec.nov.isbasedprincipallyonitsradula, between the end of the protoconch and
which is very similar to that of the type the beginning of the teleoconch; Cheiro-
speciesofthegenusMarshallora,Marsha- donta apexcrassum Rolan and Fernández-
llora adversa (Montagu, 1803). A lecitho- Garcés, 1994 is also always brown, and
trophicdevelopmentcanbeinferredfrom has two conspicuous spiral cords on the
thepaucispiralprotoconch.Lecithotrophy protoconch; Iniforis carmelae Rolan and
hasnotbeenrecordedforthegenusMars- Fernández-Garcés, 1993 and I. immacu-
hallora untilnow,but the generic coexis- lata Rolan and Fernández-Garcés, 1993
tence of lecithotrophic and planktotrop- areconstantlythefirstalmostwhite,and
hic development is frequent within the the second white, and they have only
samegenusinmarinegastropods. two spiral nodular cords in most partof
In general appearance, M. nichupte the teleoconch; I. casta (Hinds, 1843), is
spec.nov.isverysimilartoM.nigrocincta whitewithaconstantbrownspiralcord.
ACKNOWLEDGEMENTS
The authors thank Felipe Flores- the material, and Manuel Domínguez
Andolais and Arturo Toledano-Grana- for the scanning photographs made in
dos for their cooperation in collecting AIMEN(Vigo).
BIBLIOGRAPHY
Carnes,S.F. 1975.Mollusksfromsouthem Cruz-Ábrego, F. N., Flores-Andolais, F.
Nichupte lagoon, Quintana Roo, México. andToledano-Granados,A. 1994.Abun-
Sterkkma, (59): 21-50. danciaydistribucióndelosmoluscosgas-
Cruz-Ábrego, F. N. and Flores-Andolais, F. terópodosdelazonanortedelsistemala-
1994.MollusksfromBqjórquezLagoon,Quin- gunar Nichupte, Cancún, México. Avi-
tanaRoo,México:ecologicalanddistríbutio- cennia, 2: 1-11.
nalconsiderations.Avicenrúa, 2: 13-23.
91
IBERUS, 13 (2), 1995
DeJong, K. M. and Coomans, H. E. 1988. Rolan,E.andFernández-Garces,R. 1993a.
Marine gastropodsfrom Curasao, Aruba LafamiliaTriphoridaeenlaisladeCuba
andBonaire.E.J.Brill,Leiden,261págs. 1. El género Metaxia. BolletinoMalacolo-
Faber, M. J. and Moolenbeek, R. G. 1991. gico, 28(9-12): 169-176.
Two new shallowwater triphorids and a Rolan,E.andFernández-Garces,R. 1993b.
new ñame in Metaxia from Florida and The family Triphoridae (Mollusca, Gas-
theWestIridies. Apex, 6 (3-4): 81-85. tropoda) in Cuba. 2. The genus Inforis
Moolenbeek, R. G. and Faber, M. J. 1989. Jousseaume, 1884. Apex, 8 (3): 95-106.
TwonewTriphoraspecies fromtheWest Rolan, E. andFernández-Garces, R. 1994.
Indies(Gastropoda;Triphoridae).Basteria, The family Triphoridae (Mollusca, Gas-
53 (4-6): 77-80. tropoda) in Cuba. 4. The genera Monop-
Olsson, A. A. and Harbison, A. 1953. Plio- horus, Nototriphora, Cosmotriphora and
cene Mollusca ofSouthern Florida, with Cheirodontawiththedescriptionofthree
special reference to those from North newspecies. Apex, 9 (1): 17-27.
Saint Petersburg. Academy ofNatural Rolan, E.andFernández-Garces, R. 1955.
Sciences ofPhüadelphia, Monograph, 8: The family Triphoridae (Mollusca, Gas-
1-457, 65pls. tropoda) in Cuba 5. The genera Marsha-
Rolan,E.andEspinosa,J. 1994.Thefamily llora,Mesophora, Simüiphora,Eutriphora,
Triphoridae (Mollusca, Gastropoda, pro- Latitriphora,Aclophoraandotherspecies
sobranchia) in Cuba 3. The genus Iso- withoutgenericaffiliation.Apex, 10(1):9-
triphora,withdescriptionofanewspecies. 24.
Basteria, 58 (1-2): 63-68.
Recibidoel 15-11-1995
Aceptadoel 20-V-1995
Publicado en enero de 1996
92