“Microsteus”的意思、由来-开放百科全书

词条

Microsteus

释义

References

{{Italic title}}{{Taxobox
| name = Microsteus
| image = Microsteus dubius.jpg
| image_caption = Reconstruction of M. dubius
| fossil_range = Late Frasnian^[1]
| regnum = Animalia
| phylum = Chordata
| subphylum = Vertebrata
| classis = Placodermi
| ordo = Arthrodira
| subordo = Brachythoraci
| infraordo = Coccosteina
| superfamilia = Dinichthyloidea
| familia = Selenosteidae
| genus = Microsteus
| type_species = Microsteus dubius
| type_species_authority = Gross 1932
| subdivision_ranks = Species
| subdivision =

M. dubius Gross 1932
M. angusticeps (Stensiö 1963)
M. gracilis (Stensiö 1963)

| synonyms =

Parawalterosteus angusticeps Stensiö 1963
Parawalterosteus gracilis Stensiö 1963

}}

Microsteus is a genus of small selenosteid arthrodire placoderms known from the Upper Frasnian Kellwasserkalk facies of Late Devonian Germany.^[1]{{rp|96}}

There are three species, M. dubius (the type species), M. angusticeps, and M. gracilis. M. angusticeps differs from the type species in having a head with an angular profile, and M. gracilis differs from the other two species by being somewhat narrower in cross-section. Denison (1978) suggests that M. angusticeps and M. gracilis do not have enough differences from M. dubius to merit separate species status, but other authors, such as Rücklin 2011, treat the three as separate species.^[2]

M. angusticeps and M. gracilis originally composed the genus Parawalterosteus. However, Denison (1978) points out that the two species are not distinct from Microsteus, and synonymized Parawalterosteus with the former genus.

References

1. ^¹{{cite book|last=Denison|first=Robert|title=Handbook of Paleoichthyology, Volume 2, Placodermi|year=1978|publisher=Gustav Fischer Verlage|location=New York|isbn=9780895740274|pages=98}}
2. ^{{cite journal|last=RÜCKLIN|first=MARTIN|title=First selenosteid placoderms from the eastern Anti-Atlas of Morocco; osteology, phylogeny and palaeogeographical implications|journal=Palaeontology|date=January 14, 2011|volume=56|issue=1|pages=25–62|doi=10.1111/j.1475-4983.2010.01026.x}}

2 : Selenosteidae|Placoderms of Europe

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