| 词条 | Leptocleididae |
| 释义 |
| fossil_range = Early Cretaceous, {{fossilrange|Berriasian|Albian}} | image = Leptocleidus_BW.jpg | image_upright = 1.15 | image_caption = Leptocleidus | taxon = Leptocleididae | authority = White, 1940 | subdivision_ranks = Subgroups | subdivision = See text. }}Leptocleididae is a family of small-sized plesiosaurs that lived during the Early Cretaceous period (early Berriasian to early Albian stage).[1] Leptocleidus and Umoonasaurus had round bodies and triangle-shaped heads. Hilary F. Ketchum and Roger B. J. Benson (2010), transferred Brancasaurus, Kaiwhekea, Nichollssaura and Thililua to this family.[1] However, Ketchum and Benson (2011) reassigned Kaiwhekea and Thililua to their original positions, as an elasmosaurid and a polycotylid, respectively.[2] Phylogeny{{clade| style=font-size:85%;line-height:85%|label1=Leptocleididae |1={{clade |1=Kaiwhekea |2={{clade |1={{clade |1=Nichollssaura |2=Thililua }} |2={{clade |1=Brancasaurus |2={{clade |1=Umoonasaurus |label2=Leptocleidus |2={{clade |1=L. capensis |2=L. superstes }} }} }} }} }} }} Cladogram based on Ketchum and Benson (2011):[2] {{clade| style=font-size:85%;line-height:85%|label1=Leptocleididae |1={{clade |1=Nichollssaura |2={{clade |1=Brancasaurus |2={{clade |1=Umoonasaurus |label2=Leptocleidus |2={{clade |1=L. capensis |2=L. superstes }} }} }} }} }} References1. ^{{Cite journal|author1=Ketchum, H. F. |author2=Benson, R. B. J. |year=2010 |title=Global interrelationships of Plesiosauria (Reptilia, Sauropterygia) and the pivotal role of taxon sampling in determining the outcome of phylogenetic analyses |journal=Biological Reviews |volume=85 |pages=361–392 |doi=10.1111/j.1469-185X.2009.00107.x |pmid=20002391}} {{Portal|paleontology}}{{Plesiosauria|Plesiosauroidea}}{{Taxonbar|from=Q1028195}}{{plesiosaur-stub}}2. ^1 2 {{cite journal |authors=Hilary F. Ketchum and Roger B. J. Benson |year=2011 |title=A new pliosaurid (Sauropterygia, Plesiosauria) from the Oxford Clay Formation (Middle Jurassic, Callovian) of England: evidence for a gracile, longirostrine grade of Early-Middle Jurassic pliosaurids |journal=Special Papers in Palaeontology |volume=86 |issue= |pages=109–129 |doi=10.1111/j.1475-4983.2011.01083.x }} 10 : Plesiosaurs|Early Cretaceous plesiosaurs|Berriasian first appearances|Berriasian taxonomic families|Valanginian taxonomic families|Hauterivian taxonomic families|Barremian taxonomic families|Aptian taxonomic families|Albian taxonomic families|Albian extinctions |
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