Revision of Yunnanilus with descriptions of a miniature species flock and six new species from China (Cypriniformes: Homalopteridae)

1988 ◽  
Vol 23 (1-2) ◽  
pp. 65-94 ◽  
Author(s):  
Maurice Kottelat ◽  
Chu Xin-Luo
Keyword(s):  
New Species ◽  
Species Flock

The Eophreatoicus Nicholls, 1926 species flock from Kakadu and Arnhem Land, with a description of a new genus of Amphisopidae (Crustacea : Isopoda : Phreatoicidea)

Zootaxa ◽  
2020 ◽  
Vol 4854 (1) ◽  
pp. 1-303
Author(s):  
GEORGE D.F. WILSON ◽  
CHRISTOPHER L. HUMPHREY
Keyword(s):  
New Species ◽  
Reproductive Strategy ◽  
National Park ◽  
New Genus ◽  
Species Recognition ◽  
Northern Territory ◽  
Species Flock ◽  
Additional Species ◽  
The Family ◽  
Arnhem Land

We present descriptions of 28 new species of Amphisopidae from Arnhem Land and Kakadu National Park of Australia’s Northern Territory. We identified five additional species that are not yet fully characterized and are not provided with formal species recognition. This is the first taxonomic treatment highlighting the high species richness within the Phreatoicidea that occur in Australia and likely elsewhere. We document each species fully with scanning electron and light micrographic images, diagnoses, detailed descriptions, keys to identification and justification of each species using parsimony analysis of their morphological and genetic characters. The distributional data show that all species, except for one, have microendemic distributions, with some sibling species occurring within a few kilometers of each other. Because of the age of this group of species, they appear to have spread throughout the region of the Arnhem sandstone plateau and then back-colonized the same habitats so that as many as three morphologically and genetically distinct species may co-occur syntopically. Our research has uncovered a new genus-level taxon of the family Amphisopidae, Kakadubeh gen. nov. This new genus is unlike Eophreatoicus, not only in its general appearance, but also in having an inferred reproductive strategy different from most of the other members of the family. While Eophreatoicus species have males that are much larger than the females and practice precopula, a form of pre-insemination mate guarding, males of the new species, Kakadubeh rangemyahwurd sp. nov., are much smaller than females. In addition, males of this species have a fourth walking leg that is not specialized for holding females, suggesting that they have a reproductive strategy that does not involve precopula of the form seen in Eophreatoicus and Eremisopus Wilson & Keable, 2002a. Most of our research has been undertaken in Kakadu National Park, although recent collections have been made in Arnhem Land, yielding additional distinctive species. Given the size of unexplored territory around the Arnhem Plateau and the geographic frequency of discovering new species, we predict that the diversity of this group in the Northern Territory may be many more than the ~35 species described here. At this time, these microendemic isopods appear to be unthreatened by human activities, largely owing to the environmental protection afforded by Kakadu National Park and Arnhem Land, and their cryptic habits during the dry season. Because they are dependent on small springs of permanent groundwater, future changes in hydrology owing to water use and climate change, as well as invasive introduced species, may present risks to populations and species. 

New Stylodrilus species (Annelida; Clitellata; Lumbriculidae) from Lake Baikal, East Siberia

2008 ◽  
Vol 17 (1) ◽  
pp. 145-149
Author(s):  
I. Kaygorodova ◽  
P. Martin
Keyword(s):  
New Species ◽  
Lake Baikal ◽  
Species Flock ◽  
East Siberia ◽  
Unique Character

A new oligochaete worm, Stylodrilus aclotudi, has been reported from the southern part of Lake Baikal in East Siberia, Russia. The new species differs in extremely long tubular atria extending as far as segment XV, that is a unique character of the genus. This new fi nding increases the number of Stylodrilus species which are endemic to the lake up to 11, confi rming the existence of Baikal species flock.

A Putative Species Flock in the Diatom GenusGomphonemaEhrenberg (Bacillariophyta: Gomphonemataceae) from Lake Baikal, Russia: Description of Six New Species Similar toG. ventricosumW. Gregory

2018 ◽  
Vol 39 (3) ◽  
pp. 365-388 ◽  
Author(s):  
John P. Kociolek ◽  
Maxim S. Kulikovskiy ◽  
Irina V. Kuznetsova ◽  
Anton M. Glushchenko ◽  
Cüneyt N. Solak
Keyword(s):  
New Species ◽  
Lake Baikal ◽  
Species Flock ◽  
Putative Species

scholarly journals Lake Poso's shrimp fauna revisited: the description of five new species of the genus Caridina (Crustacea, Decapoda, Atyidae) more than doubles the number of endemic lacustrine species

ZooKeys ◽  
2021 ◽  
Vol 1009 ◽  
pp. 81-122
Author(s):  
Werner Klotz ◽  
Thomas von Rintelen ◽  
Daisy Wowor ◽  
Chris Lukhaup ◽  
Kristina von Rintelen
Keyword(s):  
New Species ◽  
Incomplete Lineage Sorting ◽  
Taxonomic Revision ◽  
Morphological Characters ◽  
Integrative Approach ◽  
Species Flock ◽  
Lineage Sorting ◽  
Introgressive Hybridisation ◽  
First Case ◽  
Eleven Species

Lake Poso, an ancient lake system on the Indonesian island Sulawesi, harbours an endemic species flock of six, four lacustrine and two riverine species of the freshwater shrimp genus Caridina. In this study, five new lacustrine species are described, bringing the total to eleven species altogether. The number of lacustrine species is more than doubled to nine species compared to the last taxonomic revision in 2009. One of them, Caridina mayamareenae Klotz, Wowor & von Rintelen, sp. nov., even represents the first case of an atyid shrimp associated with freshwater snails which is morphologically adapted to living in shells. An integrative approach was used by providing a combination of morphological, ecological, and molecular data. Based on standard morphological characters, distribution, substrate preferences, and colouration of living specimens in the field, five distinct undescribed species could be distinguished. To support our species-hypothesis based on the mitochondrial genes 16S and COI, a molecular phylogeny was used for all eleven species from Lake Poso. All species form a well-supported monophyletic group, but only four morphospecies consistently correspond to mtDNA clades – a possible reason could be introgressive hybridisation, incomplete lineage sorting, or not yet fixed species boundaries. These results are discussed further in the context of adaptive radiation, which turned out to be more diverse than previously described. Finally, yet importantly, subjecting all new species to similar threats and to the same IUCN category and criterion than the previously described species from the lake is recommended.

scholarly journals New species and records of springsnails (Caenogastropoda: Cochliopidae: Tryonia) from the Chihuahuan Desert (Mexico and United States), an imperiled bio-diversity hotspot

Zootaxa ◽  
2011 ◽  
Vol 3001 (1) ◽  
pp. 1 ◽  
Author(s):  
ROBERT HERSHLER ◽  
HSIU-PING LIU ◽  
J. JERRY LANDYE
Keyword(s):  
New Species ◽  
Chihuahuan Desert ◽  
Sequence Divergence ◽  
Sympatric Species ◽  
The Other ◽  
Species Flock ◽  
Southern Limit ◽  
Southern Nevada ◽  
Areas Of Endemism ◽  
Well Differentiated

We describe 13 new, narrowly localized species of the aquatic gastropod genus Tryonia from springs in the Chihuahuan Desert (Chihuahua and Texas): T. allendae n. sp., T. angosturae n. sp., T. chuviscarae n. sp., T. contrerasi n. sp., T. julimesensis n. sp., T. metcalfi n. sp., T. minckleyi n. sp., T. molinae n. sp., T. oasiensis n. sp., T. ovata n. sp., T. peregrina n. sp., T. taylori n. sp. and T. zaragozae n. sp.. These novelties are distinguished by shell and other morphologic characters and are well differentiated genetically from each other and from other congeners (mtCOI sequence divergence >1.9%). We also provide two new records for T. seemani (Frauenfeld, 1863), which is distributed near the southern limit of the Chihuahuan Desert (Durango State) and previously had been thought to be possibly extinct. Bayesian analysis of a mtCOI dataset resolved two clades composed of novelties described herein: one (containing four species) is distributed in several drainages in Chihuahua, the other (containing three species) is a local species flock in the Río Conchos basin (also in Chihuahua) that lives in the warmest waters yet recorded for Tryonia (41–44°C). (The phylogenetic relationships of the other new species were not well supported.) Both of these clades contain sympatric species pairs; co-occurrence of Tryonia congeners previously had been reported only in Ash Meadows (southern Nevada). Some of the species described herein are from previously unsurveyed localities and may help delineate new areas of endemism within the Chihuahuan Desert. One of the new species (T. julimesensis) became extinct between 1991 and 2001 and another (T. oasiensis) disappeared from its single known locality shortly after it was first discovered in 2009 and also may be extinct. The other species treated herein are at risk of extirpation owing to the declining extent and condition of their unprotected habitats.

scholarly journals Three new species of the freshwater snail genus Tylomelania (Caenogastropoda: Pachychilidae) from the Malili lake system, Sulawesi, Indonesia

Zootaxa ◽  
2008 ◽  
Vol 1852 (1) ◽  
pp. 37 ◽  
Author(s):  
THOMAS VON RINTELEN ◽  
MATTHIAS GLAUBRECHT
Keyword(s):  
New Species ◽  
Taxonomic Revision ◽  
Habitat Destruction ◽  
Shell Morphology ◽  
Habitat Specialization ◽  
Morphological Data ◽  
Species Flock ◽  
Large Species ◽  
Lake System ◽  
Three New Species

The ancient Malili lake system on the Indonesian island Sulawesi hosts a large species flock of the viviparous freshwater gastropod Tylomelania. Molecular and morphological data have previously shown that this species flock resulted from three independent lake colonizations and subsequent adaptive radiations. In a recent taxonomic revision of these radiations 25 species have been recognized. Here we describe three new species from the system found during new sampling campaigns. Despite their highly distinct shell morphology, these species were previously overlooked because of their very restricted distribution range and, in one case, the very small size. Of these new species, two are endemic to a section of the Larona River, which drains the entire lake system, while the third species has only been found at one locality in central Lake Mahalona. The discovery of these species can contribute significantly to our understanding of evolution in the entire species flock, as two of the species form a basal branch of an entire clade and all show a high degree of habitat specialization. The local endemism of the Larona River species in particular makes them highly vulnerable to extinction caused by habitat destruction.

Studies in the Ericaceae (Ericoideae) XVIII. Two new species ofErica from the southern part of South Africa

1996 ◽  
Vol 106 (5-8) ◽  
pp. 347-352
Author(s):  
E. G. H. Oliver ◽  
I. M. Oliver
Keyword(s):  
South Africa ◽  
New Species ◽  
Two New Species
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