| 词条 | Pterygoplichthyini |
| 释义 |
| image = Pterygoplichthys sp.jpg | image_caption = Pterygoplichthys sp. | taxon = Pterygoplichthyini | authority = Armbruster, 2004 | subdivision_ranks = Genera | subdivision =Pterygoplichthys }}Pterygoplichthyini is a tribe of catfishes (order Siluriformes) of the family Loricariidae. It includes two genera, Pterygoplichthys and the currently undescribed genus referred to as the Hemiancistrus annectens group,[1] This group was earlier misspelled as Pterygoplichthini.[1] Pterygoplichthyines are known from nearly the entire range of loricariids except for the Guyanas and coastal streams in southeastern Brazil.[1] although later work by the same authority, and his co-authors, placed this group among the genus Hypostomus.[2] Pterygoplichthyini is sister to the tribe Ancistrini, which shares the derived presence of an evertible patch of plates on the cheek.[1] Pterygoplichthys and the H. annectens group differ most obviously in the number of dorsal fin rays (7 in the H. annectens group and 9+ in Pterygoplichthys).[1] The two genera are supported as sisters by only one derived characteristic: a modified stomach that is attached to the abdominal wall by a net of connective tissue.[1]This modified stomach allows these fish to breathe air. The stomach is vascularized. A white net of connective tissue surrounds the organ, leaving a circular area in the middle of the stomach free; this connective tissue firmly holds the stomach to the body wall and is better developed in adults. It may also function as a hydrostatic organ, allowing the fish to remain buoyant midwater.[3] References1. ^1 2 3 4 5 {{cite web|url=http://www.auburn.edu/academic/science_math/res_area/loricariid/fish_key/ptergrp/ptergrp.html|title=Pterygoplichthyini Armbruster 2004|first=Jonathan W.|last=Armbruster|accessdate=2007-08-08}} {{Taxonbar|from=Q1121516}}2. ^{{cite journal | author1 = Jonathan W. Armbruster | author2 = David C. Werneke | author3 = Milton Tan | year = 2015 | title = Three new species of saddled loricariid catfishes, and a review of Hemiancistrus, Peckoltia, and allied genera (Siluriformes) (abstract) | doi = 10.3897/zookeys.480.6540 | journal = Zookeys | volume = 480 | pages = 97–123}} 3. ^{{cite journal|url=http://www.auburn.edu/academic/science_math/res_area/loricariid/fish_key/Air.pdf|title=Modifications of the Digestive Tract for Holding Air in Loricariid and Scoloplacid Catfishes|journal=Copeia|year=1998|issue=3|pages=663–675 | doi = 10.2307/1447796|format=PDF}} 1 : Hypostominae |
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