| 词条 | Drepanopterus |
| 释义 |
| fossil_range = Early Silurian - Late Devonian, {{fossil_range|442|358.9}} | image = The Eurypterida of New York figure 69.jpg | image_caption = Drepanopterus pentlandicus fossil | display_parents = 3 | taxon = Drepanopterus | authority = Laurie, 1892 |parent_authority=Kjellesvig-Waering, 1966| subdivision_ranks = Species | subdivision = * D. abonensis Simpson, 1951
}}Drepanopterus is an extinct genus of eurypterid and the only member of the family Drepanopteridae within the Mycteropoidea superfamily. There are currently three species assigned to the genus. The genus has historically included more species, with nine species associated with the genus Drepanopterus, however five of these have since been proven to be synonyms of pre-existing species, assigned to their own genera, or found to be based on insubstantial fossil data. The holotype of one species proved to be a lithic clast.[1] Drepanopterus pentlandicus was first described from the Silurian strata of the Pentland Hills in Scotland. The only other fully described valid species is Drepanopterus abonensis, from the Upper Devonian of Portishead, Somerset. The exact relationship of Drepanopterus to other Eurypterids has long been unclear, however it is now apparent that it is a primitive hibbertopteroid, and an early relative of the Carboniferous Hibbertopterus. DescriptionDrepanopterus is distinguished by its "fairly large" size, compound eyes with parallel axes on a subrectangular to subovate prosoma (head). All of its legs are walking legs; the first three pairs are short and powerful, with spines; the last two pairs are moderately long, ending in strongly curved terminal claw. The last leg reaches as far as the penultimate abdominal segment. The telson ranges from styliform to clavate. Drepanopterus date from the Silurian to the Upper Devonian periods.[2]Whilst classified as the basalmost member of the Drepanopteridae, Drepanopterus also shares certain characteristics with the kokomopteroids (such as having a clavate telson). Drepanopterus also has certain characteristics otherwise only found within the Mycteroptidae; appendage IV was not used in food capture and the coxae are large, as in Megarachne. Appendage III also retains some Hughmilleria-type conical spines suggesting that Drepanopterus hunted larger invertebrate or vertebrate prey than its later relatives.[3] SpeciesDrepanopterus contains three valid species,[4] with several others that historically have been assigned to it being recovered as outside of the genus. The species currently seen as valid species of the genus are:
Invalid or reassigned species are listed below:
See also
References1. ^{{cite journal|journal=Earth Sciences|volume=94|pages=235–242|author=V. P. Tollerton |title=Summary of a revision of New York State Ordovician eurypterids: implications for eurypterid palaeoecology, diversity and evolution|doi=10.1017/S0263593303000154|year=2003|issue=3}} {{Eurypterida}}{{Taxonbar|from=Q5306970}}2. ^L. Størmer. 1955. Merostomata. Treatise on Invertebrate Paleontology, Part P Arthropoda 2, Chelicerata, p. 36–37. 3. ^1 {{cite journal|author=James C. Lamsdell, Simon J. Braddy & O. Erik Tetlie|year=2010|title=The systematics and phylogeny of the Stylonurina (Arthropoda: Chelicerata: Eurypterida)|journal=Journal of Systematic Palaeontology|volume=8|issue=1|pages=49–61|doi=10.1080/14772011003603564}} 4. ^Dunlop, J. A., Penney, D. & Jekel, D. 2015. A summary list of fossil spiders and their relatives. In World Spider Catalog. Natural History Museum Bern, online at http://wsc.nmbe.ch, version 16.0 http://www.wsc.nmbe.ch/resources/fossils/Fossils16.0.pdf (PDF). 5. ^1 2 3 4 5 {{Cite journal|last=Lamsdell|first=James C.|last2=Braddy|first2=Simon J.|last3=Tetlie|first3=O. E.|date=2009-09-01|title=Redescription of Drepanopterus abonensis (Chelicerata: Eurypterida: Stylonurina) from the late Devonian of Portishead, UK|journal=Palaeontology|language=en|volume=52|issue=5|pages=1113–1139|doi=10.1111/j.1475-4983.2009.00902.x|issn=1475-4983}} 7 : Eurypterida|Fossils of the United Kingdom|Devonian eurypterids|Silurian eurypterids|Eurypterids of Europe|Silurian first appearances|Eurypterids of North America |
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