CLADISTIC ANALYSIS OF OCTOBRANCHUS MARION & BOBRETZKY, 1875 (TRICHOBRANCHIDAE: POLYCHAETA)
The genus Octobranchus contains nine valid species: Octobranchus pacificus (Berkeley & Berkeley, 1954), O. antarcticus Monro, 1936, O. floriceps Kingston & Mackie, 1980, O. japonicus Hessle, 1917, O. lingulatus (Grube, 1863), O. longipes Blankensteyn & Lana, 1987, O. myunus Hutchings &am...
| Published in: | Brazilian Journal of Aquatic Science and Technology |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | Portuguese |
| Published: |
UNIVALI
2010
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| Subjects: | |
| Online Access: | https://periodicos.univali.br/index.php/bjast/article/view/2483 https://doi.org/10.14210/bjast.v4n1.p43-48 |
| Summary: | The genus Octobranchus contains nine valid species: Octobranchus pacificus (Berkeley & Berkeley, 1954), O. antarcticus Monro, 1936, O. floriceps Kingston & Mackie, 1980, O. japonicus Hessle, 1917, O. lingulatus (Grube, 1863), O. longipes Blankensteyn & Lana, 1987, O. myunus Hutchings & Peart, 2000, O. phyllocomus Hartman, 1952 and O. sexlobatus Hartmann- Schröder & Rosenfeldt, 1989 with a wide world distribution (North Sea, Sea of Japan, Australia, Brazil, Mediterranean and Antarctica). The monophyly of Octobranchus is sustained by the presence of four pairs of gills from the second to the fifth segments, and for the presence of 16 thoracic setigers. Based in this presumed monophyly, a cladistic analysis was done to determine the phylogenetic relationships among the species. The analysis of the data generated 14 most parsimonious trees, whose consense allowed to recognize the following phylogenetic relationship (O. sexlobatus (O. floriceps (O. antarcticus (O. pacificus (O. phyllocomus ((O. japonicus, O. lingulatus) (O. longipes, O. myunus))))))). O gênero Octobranchus contém atualmente nove espécies válidas: Octobranchus pacificus (Berkeley & Berkeley, 1954), O. antarcticus Monro, 1936, O. floriceps Kingston & Mackie, 1980, O. japonicus Hessle, 1917, O. lingulatus (Grube, 1863), O. longipes Blankensteyn & Lana, 1987, O. myunus Hutchings & Peart, 2000, O. phyllocomus Hartman, 1952 e O. sexlobatus Hartmann- Schröder & Rosenfeldt, 1989 com ampla distribuição mundial (Mar do Norte, Mar do Japão, Australia, Brasil, Mediterrâneo e Antartica). O monofiletismo de Octobranchus é sustentado pela presença de quatro pares de brânquias, presentes do segundo ao quinto segmento, e pela presença de 16 setígeros torácicos. Com base nesse presumido monofiletismo, foi realizada uma análise cladística para tentar determinar as relações filogenéticas entre as espécies conhecidas. A análise dos dados gerou 14 arvores mais parcimoniosas, cujo consenso permitiu o reconhecimento da seguinte ... |
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