New Species Of Freshwater Crab Research Articles

A new species of freshwater crab of the genus Microthelphusa (Brachyura: Pseudothelphusidae) from a remote isolated cloud forest on a tabletop mountain in western Guyana, South America

A new species of freshwater crab of the genus Microthelphusa Pretzmann, 1968, from Guyana, South America is described. Microthelphusa meansi, new species, was collected from a remote isolated cloud forest in the Wokomung Massif, a tabletop mountain (tepui) in western Guyana at over 1,000 m above sea level. The conspicuous horseshoe-like marginal lobe and the dome-like auxiliar cephalic lobe of the first gonopod clearly distinguish this species from all 12 congeners.

A new species of freshwater crab of the genus Strengeriana Pretzmann, 1971, from Colombia (Crustacea: Decapoda: Pseudothelphusidae), with an updated key to the species of the genus

ABSTRACT We describe a new species of Strengeriana Pretzmann, 1971, S. villaensis, from Villahermosa, Tolima Department, on the eastern slope of the Central Andes. The genus is endemic to Colombia and is distributed in the Sierra Nevada de Santa Marta and the Western and Central Andes, at elevations ranging from 700 to 2000 m. With the addition of S. villaensis the total number of species in the genus rises to 16. This new species is distinguished from its congeners primarily by the morphology of the first male gonopod, particularly by the shape of the mesial, cephalic and lateral lobes, and the mesial and cephalic processes. We present a key for the identification of the species of the genus based on the morphology of the first male gonopod and the third maxilliped.

A new species of freshwater crab (Decapoda: Brachyura: Potamidae) from Dongyin Island, Matsu, Taiwan, defined by morphological and molecular characters, with notes on its biogeography

A new species of freshwater crab, Nanhaipotamon dongyinense sp. nov. (Decapoda: Brachyura: Potamidae), is described from Dongyin Island, Matsu, Taiwan. Based on morphological and molecular (mitochondrial 16S rRNA) evidence, it can be distinguished from its congeners. The biogeography of the species, found on an island 50 km from mainland China, is also discussed.

A new species of freshwater crab (Decapoda: Brachyura: Potamidae) from Dongyin Island, Matsu, Taiwan, defined by morphological and molecular characters, with notes on its biogeography

A new species of freshwater crab, Nanhaipotamon dongyinense sp. nov. (Decapoda: Brachyura: Potamidae), is described from Dongyin Island, Matsu, Taiwan. Based on morphological and molecular (mitochondrial 16S rRNA) evidence, it can be distinguished from its congeners. The biogeography of the species, found on an island 50 km from mainland China, is also discussed.

On a new species of freshwater crab of the genus Johora (Brachyura, Potamidae) from peninsular Thailand

[A new species of freshwater potamid crab of the genus Johora Bott, 1966, previously known only from Peninsular Malaysia and Singapore, is described from southern Thailand. The new species, J. thaiana, can be distinguished from congeners by its setose terminal segment of the male first pleopod, which is distinctly tapering and forming a conical structure, with the distal part slightly curved outwards. Une espece nouvelle de crabe Potamidae d'eaux douces du genre Johora Bott, 1966, connu auparavant seulement de la peninsule malaise et de Singapour, est decrite du sud de la Thailande. La nouvelle espece, J. thaiana, peut etre distinguee de ses congeneres par le segment terminal setifere du premier pleopode mâle, qui est distinctement effile et forme une structure conique, avec la partie distale legerement recourbee vers l'exterieur., A new species of freshwater potamid crab of the genus Johora Bott, 1966, previously known only from Peninsular Malaysia and Singapore, is described from southern Thailand. The new species, J. thaiana, can be distinguished from congeners by its setose terminal segment of the male first pleopod, which is distinctly tapering and forming a conical structure, with the distal part slightly curved outwards. Une espece nouvelle de crabe Potamidae d'eaux douces du genre Johora Bott, 1966, connu auparavant seulement de la peninsule malaise et de Singapour, est decrite du sud de la Thailande. La nouvelle espece, J. thaiana, peut etre distinguee de ses congeneres par le segment terminal setifere du premier pleopode mâle, qui est distinctement effile et forme une structure conique, avec la partie distale legerement recourbee vers l'exterieur.]

TWO NEW SPECIES OF FRESHWATER CRABS OF THE GENUS TEHUANA (BRACHYURA: PSEUDOTHELPHUSIDAE) FROM SOUTHERN MEXICO

Two new species of freshwater crabs of the genus Tehuana from the states of Tabasco and Oaxaca, Mexico, are described, and a new diagnosis for the genus is presented. Tehuana chontalpaensis, new species, was collected in a mountain river in southwest Tabasco at 900 m above sea level; it is distinguished by a first gonopod with an elongated mesial process and a large laminar lateral process with a strong lateral spine. Tehuana jacatepecensis, new species, was collected in the Jacatepec river, in central Oaxaca; it differs from other species in the genus by the first gonopod, which has a reduced, spoon-like lateral process and an ax–shaped mesial process that projects beyond the marginal process.

Two New Species of Freshwater Crabs of the Genus Tehuana (Brachyura: Pseudothelphusidae) from Southern Mexico

Abstract Two new species of freshwater crabs of the genus Tehuana from the states of Tabasco and Oaxaca, Mexico, are described, and a new diagnosis for the genus is presented. Tehuana chontalpaensis, new species, was collected in a mountain river in southwest Tabasco at 900 m above sea level; it is distinguished by a first gonopod with an elongated mesial process and a large laminar lateral process with a strong lateral spine. Tehuana jacatepecensis, new species, was collected in the Jacatepec river, in central Oaxaca; it differs from other species in the genus by the first gonopod, which has a reduced, spoon-like lateral process and an ax–shaped mesial process that projects beyond the marginal process.

A new species of freshwater crab (Brachyura, Potamoidea, Potamonautidae) from Príncipe, Gulf of Guinea, Central Africa

Introduction Systematic Account P. principe sp. nov. Ecological Notes Acknowledgements References A new species of freshwater crab of the genus Potamonautes Macleay, 1838 is described from Principe (Democratic Republic of Sao Tome and Principe), an island in the Gulf of Guinea off the coast of Central Africa. The specimens were collected during a recent zoological expedition by the Zoological Society of London. This is also the first record of a freshwater crab on the island of Principe.

A new genus and species of freshwater crab (Crustacea, Decapoda, Potamoidea) from northern Madagascar, and a second new species associated with Pandanus leaf axils

Two new species of freshwater crab are described from Madagascar, one from streams in a high-elevation locality, and the other from Pandanus leaf axils in low altitude localities. The unusual combination of characters of the new high-elevation species warrants the establishment of a new genus to accommodate this taxon. The new taxa are compared to the other species of freshwater crabs occurring in Madagascar, including Gecarcinautes antongilensis vondrozi Bott, 1965, which is considered here to be a synonym of G. antongilensis (Rathbun, 1904). Both of the new taxa are endemic to Madagascar, as are all of the genera and species of freshwater crabs found on the island.

A new genus and new species of freshwater crab (Potamoidea, Potamidae) from Socotra Island, Yemen

A new species of freshwater crab from the semi-arid highlands of Socotra Island, Yemen, is described. The unusual combination of characters of these specimens warrants the establishment of a new genus (Socotra) to accommodate the new species. The new taxon is compared to Potamon socotrensis, the other species of freshwater crab occurring in Socotra. The two species of freshwater crabs on Socotra (Potamon and Socotra) are both endemic and both show affinities with the Potamidae, a freshwater crab family with a wide distributional range that includes north-west Africa, south-east Europe, the Middle East, the Himalayas, South-East Asia and China. Perhaps surprisingly, given the close proximity of the island to the coast of Africa, the Socotran freshwater crabs were not found to be closely related to the freshwater crab families found in East Africa (Potamonautidae and Deckeniidae).

SIX NEW SPECIES OF FRESH-WATER CRABS (BRACHYURA: PSEUDOTHELPHUSIDAE) FROM CHIAPAS, MEXICO

Six new species of fresh-water crabs of the family Pseudothelphusidae from Chiapas, Mexico, are described. Two of the new species belong to the genus Phrygiopilus, which is reported from Mexico for the first time; 1 new species of Potamocarcinus is recognized; and 3 new species are placed in the genus Odontothelphusa. With the description of these new taxa, Chiapas, Mexico, can be considered as one of the areas of highest diversity for pseudothelphusid crabs.

On Two New Species of Freshwater Crabs of the Genera Sayamia and Heterothelphusa (Brachyura, Parathelphusidae) From Southern Thailand

AbstractTwo new species of freshwater crabs of the family Parathelphusidae are described from southern Thailand. Sayamia melanodactylus sp. nov. is one of the smallest members of the genus known, and seems to be most closely related to S. sexpunctata, but differing in carapace and male gonopod characters as well as in the colour of the fingers of its minor chelae (black against brown). Heterothelphusa fatum sp. nov. is related to H. insolita from nearby northeastern Peninsular Malaysia, but has a distinctly more swollen carapace, proportionately more slender ambulatory legs and a very differently structured major male chela.

Dromothelphusa Sangwan N. Sp., a New Freshwater Crab From Thailand (Decapoda, Brachyura, Potamidae)

AbstractA new species of freshwater crab, Dromothelphusa sangwan, is described from Thailand. The species is closest to Dromothelphusa nayung Naiyanetr, 1994; the differences between the two are discussed.

Thaipotamon Chulabhorn N.Sp., a New Freshwater Crab From Thailand (Decapoda, Brachyura, Potamidae)

A new species of freshwater crab, Thaipotamon chulabhorn, is described from Thailand. The species is closest to Thaipotamon dansai Ng & Naiyanetr, 1993; the differences between the two are discussed. A few notes on the biology and ecology of the new species are provided.

Further Notes on Crustacea Decapoda in the Indian Museum. VII. On a New Species of Freshwater Crab (Family Potamonidae) from the Bombay Presidency, Together with Notes on Some Allied Species

Further Notes on Crustacea Decapoda in the Indian Museum. VII. On a New Species of Freshwater Crab (Family Potamonidae) from the Bombay Presidency, Together with Notes on Some Allied Species

Description of a New Species of Freshwater Crab from Southern India

Description of a New Species of Freshwater Crab from Southern India

Description of a new species of freshwater crab from Southern India

Description of a new species of freshwater crab from Southern India

Descriptions of two new species of fresh-water crabs from Costa Rica

Descriptions of two new species of fresh-water crabs from Costa Rica