Unconventional characters in cephalopod systematics are able to solve the controversial taxonomic status of Todaropsis eblanae (Ball, 1841)
| Autor: | Escolar Sánchez, Oscar, Fernández-Álvarez, Fernando Ángel, Villanueva, Roger |
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| Rok vydání: | 2018 |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | Cephalopod International Advisory Council Conference (CIAC 2018) : Cephalopod Research Across Scales: From Molecules to Ecosystems, 12-16 November 2018, St. Petersburg, Florida, USA.-- 1 page Traditionally, three subfamilies for the familyOmmastrephidae Steenstrup, 1857 have been recognized: Illicinae Posselt, 1891,Todarodinae Adam, 1960 and Ommastrephinae Posselt, 1891. Controversy existsregarding the actual number of subfamilies. Particularly difficult is the taxonomicposition of Todaropsis eblanae(Ball,1841), whose placement varies according with the taxonomists ́s criteria, beingallocated as Illicinae or Todarodinae, and even a monotypic subfamily -TodaropsinaeNigmatullin, 2000-has been proposed to allocate this species. Different molecularsystematics works showed a closerrelation between T. eblanaeand Illicinae instead that between T. eblanaewith members of the Subfamily Todarodinae, astraditional taxonomy considered. Since traditional taxonomic morphologicalcharacters seem to be unable to solve the taxonomic positionof this particularspecies, some unconventional characters in cephalopod systematics were studied.T. eblanaeshares with Illicinae thebiflagellate spermatozoa. Both taxa also shared an earlier development ofchromatophores during the embryonic phase in comparison with otherommastrephids. These synapomorphies provide further morphological support tothe clade formed by both groups in molecular systematic works. Three hatchlingmorphological autoapomorphies isolates T. eblanaefrom the remaining ommastrephids: its larger hatching size and thehigher degree of development of the arm crown and the respiratory system.Although the absence of seminal receptacles in Illicinae isolates this groupfrom T. eblanaeand the remainingommastrephids, the morphology ofthe seminal receptacles of T.eblanaeis unique among the family. Thenew described synapomorphies of the clade (Todaropsis(Illicinae))preclude the inclusion of T. eblanaewithin Todarodinae. However, both Illicinae and T. eblanaehave enough private apomorphies to consider them asseparated subfamilies |
| Databáze: | OpenAIRE |
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