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区分成年巴塔哥尼亚七鳃鳗和袋七鳃鳗的形态和物理特征。

Morphometric and physical characteristics distinguishing adult Patagonian lamprey, Geotria macrostoma from the pouched lamprey, Geotria australis.

机构信息

National Institute of Water and Atmospheric Research Ltd, Hamilton, New Zealand.

Instituto de Diversidad y Evolución Austral (IDEAus-CONICET), Puerto Madryn, Chubut, Argentina.

出版信息

PLoS One. 2021 May 5;16(5):e0250601. doi: 10.1371/journal.pone.0250601. eCollection 2021.

DOI:10.1371/journal.pone.0250601
PMID:33951087
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8099125/
Abstract

The pouched lamprey, Geotria australis Gray, 1851, has long been considered monotypic in the Geotriidae family with a wide southern temperate distribution across Australasia and South America. Recent studies have provided molecular and morphological evidence for a second Geotria species in South America; Geotria macrostoma (Burmeister, 1868). The aim of this study was to determine morphometric and physical characteristics of adult G. macrostoma that further differentiate this re-instated species of Geotriidae from G. australis. The diagnostic features discriminating immature adult G. macrostoma from G. australis when entering fresh water, are distinct differences in dentition, oral papillae and fimbriae counts and differences in coloration. In addition, G. macrostoma display greater growth of the prebranchial region and oral disc and has a deeper body depth and higher condition factor. All current ecological knowledge of the genus Geotria is based on Australasian populations, which may not be applicable to G. macrostoma. To ensure the conservation and protection of the Patagonian lamprey as a re-identified species, further investigations are needed to understand its life history, biology and ecology throughout its range.

摘要

袋鼬鳗，Geotria australis Gray，1851，长期以来被认为是 Geotriidae 科中的单型种，在澳大利亚和南美洲的南部温带地区广泛分布。最近的研究为南美洲的第二种 Geotria 物种提供了分子和形态学证据；Geotria macrostoma（Burmeister，1868）。本研究旨在确定成年 G. macrostoma 的形态和物理特征，进一步将这种重新确立的 Geotriidae 物种与 G. australis 区分开来。当进入淡水时，区分不成熟的成年 G. macrostoma 和 G. australis 的鉴别特征是牙齿、口腔乳突和纤毛计数以及颜色的明显差异。此外，G. macrostoma 的前鳃区和口腔盘生长更大，身体深度更深，条件系数更高。关于 Geotria 属的所有现有生态知识都是基于澳大利亚的种群，这些知识可能不适用于 G. macrostoma。为了确保巴塔哥尼亚袋鼬作为重新鉴定的物种得到保护和保护，需要进一步调查以了解其在整个分布范围内的生活史、生物学和生态学。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773b/8099125/c1f3ab295ae0/pone.0250601.g013.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773b/8099125/aed17712a46c/pone.0250601.g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/773b/8099125/3305c4e4793a/pone.0250601.g010.jpg
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