New Species Of Freshwater Crab Research Articles

A new species of freshwater crab from the East Usambara Mountains of Tanzania, East Africa, with a redescription of Telphusa infravallata Hilgendorf, 1898 (Brachyura: Potamoidea: Potamonautidae)

This work describes a new species of freshwater crab from the East Usambara Mountains of Tanzania from previously unidentified museum material. A second species from these mountains, T. infravallata Hilgendorf, 1898, is redescribed based on reexamination of the type material, and its gonopods and mandible are illustrated for the first time. Diagnoses, illustrations, and a distribution map are provided for these species.

Description of a new genus and new species of freshwater crab (Crustacea, Decapoda, Potamidae) from Yunnan, China

A new genus and new species of freshwater crab is described from Yunnan Province, China. Proboscimon keeae gen. n., sp. n. belongs to a group of Chinese genera that lack a flagellum on the exopod of the third maxilliped. Of these, it is superficially most similar to Arquatopotamon Chu, Zhou & Sun, 2017 from Yunnan, but is distinguished from it and other genera mainly by the form of its male first pleopod as well as characters of the carapace, thoracic sternum, and male sternopleonal cavity.

A new species of freshwater crab of the genus Huananpotamon Dai & Ng, 1994 (Decapoda: Brachyura: Potamidae) from northern Jiangxi, China

A morphologically distinct new species of Huananpotamon Dai & Ng, 1994, is described from Yugan County, Shangrao City, Jiangxi Province, China. The new species, H. amicitiae sp. nov., can be differentiated from its closest congeners by structure of the epibranchial tooth, external orbital angle and male first gonopod. A phylogenetic analysis based on mitochondrial 16S rDNA sequences supports the recognition of the new species.

A new species of freshwater crab of the genus Hypolobocera Ortmann, 1897 from Colombia (Crustacea: Decapoda: Pseudothelphusidae), including a key to the species of the genus distributed in Colombia

The genus Hypolobocera Ortmann, 1897, is represented by 38 species and is distributed in the south-western Panama, Venezuela, Colombia, Ecuador, and Peru, including the twenty-two registered species for Colombia. We describe and illustrate a new species of Hypolobocera Ortmann, 1897 from the foothills of the Western Cordillera, Antioquia Department, Cauca River basin, Colombia, which increases in this country the number of Hypolobocera species to twenty-three. The species distribution of this genus covers an extensive area of the Colombian territory, including most of Colombia’s major river basins. We distinguished the new species from its congeners mainly by the third maxilliped, with an exopod that is 0.20 to 0.30 the length of ischium, and by the morphology of the first male gonopod, particularly by the shapes of the lateral and the mesial lobes and the outline of the apex. We include a key to species identification that uses the morphology of the first male gonopod.

A new species of freshwater crab, Sundathelphusa roberti (Brachyura, Gecarcinucidae) from highlands in Batangas, Luzon, Philippines

Abstract A new species of freshwater crab belonging to a group of species morphologically similar to Sundathelphusa philippina (Von Martens, 1868) is described from highlands in the province of Batangas, southern Luzon, Philippines. Sundathelphusa roberti new species, however, differs from members of this group by the position and strength of the epigastric and postorbital cristae, form of the posterior epistomal margin, shape of the third maxillipeds, and structure of the male first gonopod. The new taxon is the 35th species of Sundathelphusa known from the Philippines.

A new species of the genus Indochinamon Yeo & Ng, 2007 (Crustacea: Brachyura: Potamoidea: Potamidae) and a new country record from Northern Vietnam

A new species of freshwater crab, Indochinamon datii n. sp. is described from Xuan Son National Park, Phu Tho Province, Northern Vietnam. The new species external morphology is most similar to I. kimboiense (Dang, 1967) and I. bavi Naruse, Nguyen & Yeo, 2011. However, it can be distinguished from the other species by characters of the carapace, telson and male first gonopod. Indochinamon malipoense Zhang & Sun in Zhang, Pan, Hao & Sun, 2020 is also recorded for the first time in Vietnam.

On a new species of freshwater crab from southern China (Crustacea, Brachyura, Potamidae).

A new species of potamid freshwater crab of the genus Indochinamon Yeo & Ng, 2007, is described from a recent collection in Yunnan Province, China. Indochinamon frontatum sp. nov. is distinguished from congeners by the form of the carapace, notably in the features of the convex frontal region, and distinctively structured male first gonopod. Molecular data derived from the mitochondrial 16S rDNA supports the recognition of the taxon.

Stoliczia setoiyenica, a new species of freshwater crab from southern Thailand (Crustacea: Decapoda: Brachyura: Potamidae).

A new species of freshwater crab is described from southern Thailand, near the border with Peninsular Malaysia. Species of Stoliczia are characterised by their relatively flat carapace, a third maxilliped exopod that possesses no or a very short flagellum, and a conical male gonopod terminal segment that lacks or only has a very low dorsal fold. Stoliczia setoiyenica, new species, most closely resembles S. perlensis and S. kedahensis from northern Peninsula Malaysia but can be easily distinguished from congeners by differences in carapace and male gonopod morphology. Comparisons to the two known Thai Stoliczia species, S. panhai and S. ekavibhathai, are also provided for completeness.

Ghatiana sanguinolenta, a new species of freshwater crab (Brachyura: Gecarcinucidae) from the Central Western Ghats of India.

Ghatiana sanguinolenta sp. nov. is recognized herein as the twelfth species of the gecarcinucid genus Ghatiana Pati & Sharma, 2014, and the fifth species of the genus from the Karnataka state. This new species of freshwater crab is currently known only from the type locality, which is situated in the Central Western Ghats of India. Ghatiana sanguinolenta sp. nov. can be immediately distinguished from congeners by the outwardly curved ultimate article of the male first gonopod and the dark blood-red colour in life.

A NEW SPECIES OF FRESHWATER CRAB OF THE GENUS POTAMOCARCINUS H. MILNE EDWARDS, 1853 (CRUSTACEA: BRACHYURA: PSEUDOTHELPHUSIDAE) FROM COLOMBIA

A new species of freshwater crab from Colombia of the genus Potamocarcinus H. Milne Edwards, 1853, is described and illustrated, bringing the total number of known species in the genus to 12. This new species was collected in Apartadó, Antioquia Department, and is distinguished by the morphology of the male first gonopod, particularly the presence of a basally wide, spine-like median cephalic process on the cephalic surface, and a slightly rounded proximo-lateral process.

A new species of freshwater crab of the genus Chaceus Pretzmann, 1965 (Brachyura: Decapoda: Pseudothelphusidae) from La Guajira, including distribution and a key to the species of the genus.

We describe and illustrate a new species of Chaceus Pretzmann, 1965, from the Regional Natural Park of the Serranía de Perijá, La Guajira Department, Colombia. This increases the number of Chaceus species to ten, three of them with records only from Venezuela. The species of this genus are distributed in the Sierra de Santa Marta of Colombia and the Serranía de Perijá of Colombia and Venezuela. We distinguished the new species from its congeners mainly by the third maxilliped, with an exopod that is 0.60-0.62 the length of ischium, and by the morphology of the first male gonopod, particularly by the shapes of the mesial, marginal, and lateral processes. We include the distribution of the Chaceus species here and a key for the identification of the species based on the morphology of the first male gonopod.

A new genus and new species of freshwater crab (Decapoda: Brachyura:Gecarcinucidae) from the Central Western Ghats of India.

A new genus and new species of gecarcinucid freshwater crab, Aradhya placida gen. et sp. nov., is recognized from the northern part of the Central Western Ghats of India. The new genus is diagnosed, and the new species from the Uttara Kannada district of Karnataka state, is described herein. The new genus most resembles Arcithelphusa Pati & Sudha Devi, 2015, Cylindrotelphusa Alcock, 1909, Rajathelphusa Raj, Kumar & Ng, 2021, and Pavizham Raj, Kumar & Ng, 2022, in having an ovate, relatively narrow and deep carapace, with the front narrow as compared to other Indian gecarcinucid genera. Aradhya gen. nov. is nevertheless separated from those genera by the characters in the carapace, epigastric and postorbital cristae, external orbital angle, cervical grooves, third maxilliped, chelipeds, male thoracic sternites/sternopleonal cavity/pleon, male second gonopod, and especially by the elongated male telson and the stouter ultimate article of the male first gonopod.

Description of a new montane freshwater crab (Arthropoda, Malacostraca, Decapoda, Potamonautidae) from the Eastern Cape, South Africa.

A new species of freshwater crab, Potamonautesamatholesp. nov., is described from the Winterberg-Amathole mountain range in the Eastern Cape Province, South Africa. Morphologically, P.amathole Peer & Gouws, sp. nov. most closely resembles P.tuerkayi but can be distinguished by key morphological characters including the variation in the shape of the subterminal segment of gonopod 2 between both species. Genetically, P.amathole Peer & Gouws, sp. nov. is placed within the clade of small-bodied, mountain-dwelling crabs including P.parvispina, P.parvicorpus, P.brincki, P.tuerkayi, P.baziya, and P.depressus. The new species is found in slow-moving mountain streams and pools at high altitudes. The continued discovery and description of new freshwater crab species reinforces the need for ongoing research, especially in under-sampled regions.

A new species of potamid crab, Isolapotamon seowi (Brachyura, Potamoidea) from Kokol Hill in western Sabah, Malaysia, Borneo

Abstract A new species of freshwater crab of the genus Isolapotamon Bott, 1968 (Potamidae) is described from western Sabah in Malaysian Borneo. Isolapotamon seowi new species, is the sixth species of Isolapotamon known from Sabah, and differs from its closest congener, I. buntyae Ng, Low & Clark, 2022, from eastern Borneo, in possessing a relatively lower carapace, a more rugose dorsal carapace surface, the postorbital cristae being sharper and subparallel with the frontal margin, relatively shorter fourth ambulatory legs, and the terminal segment of the male first gonopod is gently curved with the subdistal process slightly longer than the distal projection and angled at 90° to the longitudinal axis.

Vichai cyanapelou gen. et sp. nov. (Crustacea: Deckeniidae: Hydrothelphusinae), a new genus and new species of freshwater crab from northern Madagascar

ABSTRACT A new genus and new species of freshwater crab, Vichai cyanapelou gen. et sp. nov., is described from the forested Sava Region of northern Madagascar based on morphology and previously obtained molecular data. The new genus superficially resembles several other deckeniid genera from Madagascar. A combination of characters in the carapace, mandible, cheliped, thoracic sternum, third maxilliped and male first gonopod, however, distinguish it from confamilials. Previous phylogenetic analysis using the cytochrome oxidase subunit I (COI) gene also supports the new monotypic genus and new species and shows that it forms a distinct clade separate from the 12 other Malagasy genera. Vichai cyanalepou sp. nov. is endemic to Madagascar and is here compared to other species and genera of freshwater crabs occurring in that country. http://www.zoobank.org/urn:lsid:zoobank.org:pub:46218584-43FE-4C05-9537-FFC81EACCFDB http://www.zoobank.org/urn:lsid:zoobank.org:act:B5985969-B677-47E4BE59-37C1308B7A66

A new genus and three new species of freshwater crab (Crustacea: Brachyura: Potamidae) from central and northern Vietnam

A new genus and three new species of freshwater crab (Crustacea: Brachyura: Potamidae) from central and northern Vietnam

Gurumon gurumayum, a new genus and new species of freshwater crab (Decapoda: Brachyura: Potamidae) from Arunachal Pradesh, northeastern India

A new genus and new species of potamid crab, Gurumon gurumayum gen. et sp. nov., are described from the Arunachal Pradesh State of northeastern India. Gurumon gen. nov. has affinities with Abormon Mitra, Pati & Ng, 2021, Pararanguna Dai & Chen, 1985, and some species of Potamiscus Alcock, 1909, but the new genus can easily be differentiated from them mainly by its low external orbital angle, the relatively stouter exopod of the third maxilliped, and the relatively broader male pleonal somite 6. Their male first gonopods are also different from each other. Counting Gurumon gurumayum gen. et sp. nov., India is currently known for ten genera and 24 species of potamiscine freshwater crabs, and Arunachal Pradesh for eight genera and 11 species of these crabs. The current nomenclatural problems with Potamiscus are also discussed.

Two new genera and one new species of freshwater crabs of the subfamily Pseudothelphusinae (Decapoda: Brachyura: Pseudothelphusidae) from southwestern Mexico

Two new genera from the Chimalapas region in eastern Oaxaca, and from Zongolica, Veracruz, Mexico are presented. Mokayathelphusa angelsotoi n. gen., n. sp., which is described from Oaxaca, is placed in the subfamily Pseudothelphusinae due to the presence of a caudomarginal projection that ends apically in an ornamented plate. Alvarezius n. gen. is erected to accommodate A. zongolicae (Alvarez, Villalobos & Moreno, 2012) n. comb. This species was described in Pseudothelphusa, but a recent molecular phylogenetic analysis based on partial sequences of three genes (COI, 16S and H3) places this species outside the genus Pseudothelphusa and as a sister lineage to Tehuana. These results in combination with a morphological analysis support the establishment of the new genus.

Jianghuaimon dabiense gen. nov. et sp. nov (Crustacea: Decapoda: Potamidae), a new genus and new species of freshwater crab from eastern-central China.

A new genus and new species of freshwater crab, Jianghuaimon dabiense gen. et sp. nov., is described from Anhui and Hubei Provinces of China based on morphology and mitochondrial 16S rDNA sequences. Externally, the new genus resembles several other potamid genera from China. However, its combination of carapace, male pleon, third maxilliped, and uniquely structured male first gonopod distinguish it from the others. Phylogenetic analysis using the 16S gene supports the new genus new species and shows that it, together with morphologically similar Neilupotamon and Bottapotamon, form a distinct clade.

A new genus and new species of potamid crab from Yunnan, southern China (Decapoda: Brachyura: Potamidae: Potamiscinae)

Abstract A new genus and new species of freshwater crab, Barbamon zhouigen. nov., sp. nov., belonging to the subfamily Potamiscinae Bott, 1970 (Potamidae Ortmann, 1896) is described from Wenshan Zhuangzu and Miaozu Autonomous Prefecture, Yunnan Province, China. The new genus is established based on a unique combination of characters, including the distinctive shape of the male first gonopod, and the setose ventral surface of the third maxilliped, suborbital and pterygostomial regions, and ambulatory legs. Barbamongen. nov. is similar in external appearance to AbormonMitra, Pati & Ng, 2021. The new genus, however, is distinctive in the combination of characters related to the carapace, third maxilliped, and male first gonopod. Molecular phylogenetic data derived from mitochondrial 16S rDNA sequences provides genetic support for the new genus and species.