Cryptic species diversity and molecular diagnosis of Channa orientalis; an endemic freshwater fish of Sri Lanka

AbstractThis paper focuses on the species diversity among the Trichostrongylidae Leiper, 1912 (Nematoda: Strongylida), and complexity of the family systematics. Polymorphism (subfamilies: Ostertagiinae, Cooperiinae and Haemonchinae), the presence of cryptic species (genus: Teladorsagia) and hybridization (genera: Cooperia, Haemonchus and Ostertagia) are presented and discussed, considering both morphological and molecular evidence. Some of these phenomena are common, nevertheless not sufficiently understood, which indicates the need for expanding the current state of knowledge thereof. Within the Trichostrongylidae, species distinction supported merely by morphological features is difficult, and requires confirmation by means of molecular methods. The parasitic nematode taxonomy is complicated mainly by the genus Teladorsagia, but complexity may also be expected among other Ostertagiinae (e.g. in the genera Ostertagia and Marshallagia). The data presented here show that the members of the Trichostrongylidae can significantly complicate unambiguous species identification. Hence, it is essential to consider the phenomena mentioned, to gather valid and comparable data on the biodiversity of this family.

Download Full-text

First molecular phylogeny of the circumtropical bivalve family Pinnidae (Mollusca, Bivalvia): Evidence for high levels of cryptic species diversity

Molecular Phylogenetics and Evolution ◽

10.1016/j.ympev.2014.02.008 ◽

2014 ◽

Vol 75 ◽

pp. 11-23 ◽

Cited By ~ 22

Author(s):

Sarah Lemer ◽

Barbara Buge ◽

Amanda Bemis ◽

Gonzalo Giribet

Keyword(s):

Species Diversity ◽

Molecular Phylogeny ◽

Cryptic Species

Download Full-text

Freshwater fish fauna of rivers of the southern Western Ghats, India

Earth System Science Data ◽

10.5194/essd-10-1735-2018 ◽

2018 ◽

Vol 10 (3) ◽

pp. 1735-1752 ◽

Cited By ~ 2

Author(s):

Anbu Aravazhi Arunkumar ◽

Arunachalam Manimekalan

Keyword(s):

Species Diversity ◽

Freshwater Fish ◽

Western Ghats ◽

Biological Diversity ◽

Fish Fauna ◽

World Heritage Site ◽

Freshwater Fish Fauna ◽

Western Ghats Of India ◽

Southern Western Ghats ◽

The Western Ghats

Abstract. The Western Ghats of India is a UNESCO World Heritage Site and is one of the eight “hotspots” of biological diversity in the world. It is also referred to as the “Great Escarpment of India”. This paper provides information on the diversity of freshwater fish fauna of six river systems of the southern Western Ghats. The study area has been identified geographically using a GPS, and the respective topographic map has been digitized using ArcGIS software. The fish fauna were collected from various streams and rivers using cast nets, dip nets, gill nets and drag nets. Among the 31 georeferenced sites sampled from the rivers of the southern Western Ghats, a total of 64 species, belonging to 6 orders, 14 families and 31 genera, were recorded. Among them, the order Cypriniformes was dominant, with 3 families, 18 genera and 49 species (76.6 %). Principal component analysis and cluster analysis were performed to express the contribution of the variables and their influence on the species diversity. Interestingly, of the 31 sites, Thunakadavu stream, Gulithuraipatti, Athirapally, Naduthotam, Nadathittu, Mullaithodu, Thonanthikla, Noolpuzha and Sinnaru exhibited high variation in species diversity. Nearly 15 species were found to be threatened in the Western Ghats. Garra periyarensis and Cirrhinus cirrhosus are known to be vulnerable and Hemibagrus punctatus is critically endangered because of various anthropogenic activities. The study clearly indicates that certain timely measures have to be taken immediately to protect the fish fauna in the southern Western Ghats (https://doi.org/10.1594/PANGAEA.882214).

Download Full-text