A new species of Brachyorrhos from Seram, Indonesia and notes on fangless homalopsids (Squamata, Serpentes)

Q3 Environmental Science

Philippine Journal of Systematic Biology Pub Date : 2021-07-19 DOI:10.26757/pjsb2020b14015

John C. Murphy, H. Voris

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引用次数: 1

Abstract

Homalopsid snakes are monophyletic and contain two major subclades: a fangless clade and rear-fanged clade. They are distributed in South Asia, Australasia, and the Western Pacific. The fangless clade is restricted to the eastern Indonesian Archipelago and the island of Sumatra and is poorly known in terms of its natural history. Molecular data support the eastern Indonesian fangless endemic genus Brachyorrhos as the sister to the rear-fang clade. Here we recognize the identity of the Brachyorrhos population from the island of Morotai as B. wallacei and describe a new species of dwarf Brachyorrhos from the island of Seram, Malukus, Indonesia. The new species can be distinguished from all congeners by a lower number of ventral scales, the presence of a preocular scale and a loreal scale, as well as its exceptionally diminutive size. The new species is a candidate for the smallest alethinophidian snake. The three fangless genera, Brachyorrhos, Calamophis, and Karnsophis, have been suggested to form a clade of homalopsid snakes restricted to the Indonesian Archipelago, and we discuss their biogeography. KEYWORDS: biogeography, Calamophis, Homalopsidae, Karnsophis, small snakes

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印度尼西亚Seram长颈蛇属一新种及无牙类同形拟足类注(鳞目，蛇形目)

同形猿蛇是单系的，包含两个主要的亚支系:无尖牙支系和后有尖牙支系。它们分布在南亚、澳大拉西亚和西太平洋。这种无牙的进化支仅生活在印度尼西亚群岛东部和苏门答腊岛上，对其自然史知之甚少。分子数据支持印尼东部无尖牙特有属Brachyorrhos是后尖牙分支的姐妹。在这里，我们承认来自Morotai岛的Brachyorrhos种群的身份是B. wallacei，并描述了来自印度尼西亚马鲁古斯岛Seram岛的一个新的矮Brachyorrhos物种。这个新物种与所有同类的区别在于，它的腹侧鳞片数量更少，眼前鳞片和眼前鳞片的存在，以及它异常小的尺寸。这个新物种是最小的蛇的候选物种。Brachyorrhos、Calamophis和Karnsophis这3个无牙属被认为构成了一个局限于印度尼西亚群岛的类猿蛇的分支，我们讨论了它们的生物地理学。关键词:生物地理学，菖蒲，蠓科，金菖蒲，小蛇

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来源期刊

Philippine Journal of Systematic Biology Environmental Science-Ecology

CiteScore

1.50

自引率

0.00%

发文量

期刊介绍： The Philippine Journal of Systematic Biology (Print ISSN: 1908-6865; Online ISSN: 2508-0342) is an annual, peer-reviewed journal in English that publishes high quality reports of original research and reviews in the field of Taxonomy & Systematics, Ecology and Conservation Biology. The PJSB is a CHED recognized journal under CHED CMO 50 series of 2017. It is also included in the Clavariate Analysis (formerly a subsidiary of Thomson Reuters) Master Journal List under Zoological Record, BIOSIS Previews and Biological Abstracts.The PJSB is the official publication of the Association of Systematic Biologists of the Philippines (SEC Registration: Association of Philippine Taxonomists, Inc.). The organization financially supports the journal and all its endeavors. The journal aims to build up quality information on animal, plant and microbial diversity in the Philippines. Articles dealing with original research or reviews in Zoological, Botanical or Microbial Systematics, Ecology and Conservation Biology are welcome. Authors are advised to consult a recent issue of PJSB for the current format and style. All manuscripts are reviewed by at least two qualified referees.