Genero berria, Stegasteridae (Echinoidea) Coniaciarreko Euskokantauriar arroko sakoneko faziesekoa
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Otros documentos de la autoría: Forner, Enric; Arbilla Karasatorre, José Kruz; Moreno Alcalde, Txema
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Genero berria, Stegasteridae (Echinoidea) Coniaciarreko Euskokantauriar arroko sakoneko faziesekoaFecha de Publicación
2021Resumen
Gaur egungo Holasteroida Durham & Melville, 1957, ordenako ekinidoak itsaso sakonean soilik bizi dira.
Ekinido guztien artean batimetria handiagoko eremuetan bizi direnak ditugu (Smith & Kroh, 2020), nahiz eta
Kre ... [+]
Gaur egungo Holasteroida Durham & Melville, 1957, ordenako ekinidoak itsaso sakonean soilik bizi dira.
Ekinido guztien artean batimetria handiagoko eremuetan bizi direnak ditugu (Smith & Kroh, 2020), nahiz eta
Kretazeoan holasteroideo batzuk sakonera gutxiko uretan egon bazeuden. Haien arteko erlaziorik gabe, lau
aldiz gutxienez, migratu dira holasteroideoak itsaso sakonerantz; horietatik hirutan Goi Kretazeoa eta Tertziarioaren artean. Stegasteridae (Duncan, 1889) familiakoak nagusitu ziren Goi Kretazeoko ur sakonetan baina,
antza, Kretazeo/Tertziarioko trantsizioan galera handia pairatu zuten. Stegasteridae familiaren sistematika ez
dago oraindik ongi finkatuta, beste arrazoiren artean, deskribatutako genero-tipoen hainbat espezieren ezagutza ahula delako.
Egun Euskokantauriar arro sedimentarioko (CVC hemendik aurrera, Cuenca Vasco-Cantábricaren siglak,
hain zuzen ere) ekinidoen ezagutza eskasa da eta, bestalde, deskribapen urriko Rispolia subtrigonata (Catulo,
1827) izenarekin ekinido asko aipatzen dira, beti ur sakonekin lotuak, eremu eta adin geologiko oso ezberdinekoak, espeziaren aldakortasun handia aitzakia harturik, baina baliteke espezie ezberdinez aritzea; hori dela
eta, beraien ezagutzan sakontzea bidezkoa dirudi.
Rispolia Lambert,1917, generoa ez dela onargarria ondorioztatzen da Stegaster Pomel, 1883, generoaren
ondorengo sinonimoa delako; eta baita espezie tipotzat Rispolia subtrigonata hartzen duelako, zeina taxon
bezala barne moldetan bakarrik oinarritzen denez zehaztasun, ezagupen eta irudikapen eskasekoa delako.
Gauzak horrela, nomen dubium bezala hartu beharko litzateke, eta horrela ez jokatzean taldearen sistematikan nahasmen handia sortarazi du. Kontuan hartu behar da holotipoa galduta dagoela eta diagnosi-ezaugarri
nagusiak agerian utziko zituen kalitatezko material faltagatik ezin izan dela deskribapen berririk egin. Iberiar
penintsulako R. subtrigonata multzoan sailkatu den material guztia bi taldetan banatu daiteke: CVCn eta ziur
aski baita Huescan eta Lleida aldean aurkitu direnak ere -azken hauek kontserbazio oneko aleak ez izanda erelan honetan deskribatzen den espeziari dagozkio. Berriz, Sistema Bético-ko eremukoak (Almeria, Murtzia,
Alacant) Stegaster sp. espezie bati dagozkio, zeinean anbulakro pareak ez-petalodun agertzen diren eta sistema
apikala luzatua, betiere, azterketa sakona osatzeko kalitatezko aleen falta izan.
Stegasteridae familiaren diagnosia ere zuzendu eta biribildu egiten da lan honetan, genero berri bat deskribatuz, Nafarroina, eta baita espezie berria ere, singularis, hain zuzen ere. Ondorioz, ur sakonetako Stegasteridae
familiaren ezagutzarako ekarpena egiten da eta baita CVCko Echinoidea klasea hobe ezagutzeko ekarpena ere. [-]
Currently, echinoids of the order Holasteroida Durham & Melville, 1957 live exclusively in the deep sea. In the
Cretaceous some groups of holasteroids lived in shallower waters. Holasteroids have migrated to the deep ... [+]
Currently, echinoids of the order Holasteroida Durham & Melville, 1957 live exclusively in the deep sea. In the
Cretaceous some groups of holasteroids lived in shallower waters. Holasteroids have migrated to the deep sea
at least four times independently, three of those times being between the Upper Cretaceous and the Lower Tertiary. The components of the family Stegasteridae Duncan, 1889 were the dominant deep-water holasteroids of
the Upper Cretaceous, but they apparently underwent a major regression in the Cretaceous / Tertiary transition. The systematic understanding of the Stegasteridae family is not yet fully established. One of the causes is
insufficient knowledge of some type species of the genera described.
Current knowledge of the echinoids of the Basque-Cantabrian sedimentary basin (BCB) is quite incomplete.
On the other hand, many echinoids are cited under the name of Rispolia subtrigonata (Catullo, 1827), which
was described in a very incomplete way, despite originating from different zones and ages, always from deep
facies, taking refuge in the great variability of the species. It is very likely that there are different species among
them and it is of interest to improve our knowledge about them.
It is concluded that the genus Rispolia Lambert, 1917 is not valid, because it is a later synonym of Stegaster
Pomel, 1883. Additionally, because it has as a type species, R. subtrigonata, which is an insufficiently described,
understood and figurative taxon which, apparently, is only known from internal moulds, it should be considered nomen dubium. This failure has contributed to a great deal of confusion in the group’s system. The holotype is lost and it has not been possible to re-write with quality material, where all the diagnostic characters
can be appreciated. It is considered that all the material that has been assigned to R. subtrigonata in the Iberian
Peninsula can be classified into two groups. The fossils of the BCB and also, presumably in the absence of good
specimens, those of the Lleida-Huesca area, correspond to the species described in this work. Those from the
Betic area (Almería, Murcia and Alicante) correspond to a Stegaster sp., with no petaloid pairs ambulacres and
elongated apical system, and which is pending study in the hope of obtaining specimens of sufficient quality
The diagnosis of the family Stegasteridae has been amended and completed. The new genus Nafarroina and the
new species singularis have been described. Therefore, a small contribution has been made to the improvement
of the knowledge of the deep-sea family Stegasteridae and of the Echinoidea class, in general, to the BCB. [-]
Palabras clave / Materias
Cita bibliográfica
FORNER, Enric; KARASATORRE, Jose Kruz Arbilla; ALCALDE, Txema Moreno. Genero berria, Stegasteridae (Echinoidea) Coniaciarreko Euskokantauriar arroko sakoneko faziesekoa. Nemus. Revista de l'Ateneu de Natura, 2021, 11: 187-204Publicado en
Nemus: revista de l'Ateneu de Natura, 2021, núm. 11Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://ateneudenatura.uji.es/Nemus/nemus.htmEditor
Ateneu de NaturaDerechos de acceso
http://rightsstatements.org/vocab/InC/1.0/
info:eu-repo/semantics/openAccess
info:eu-repo/semantics/openAccess
Aparece en las colecciones
- Any 2021 - Núm. 11 [24]