A revision of Parhyalella Kunkel (Crustacea: Amphipoda: Gammaridea)

The genus Parhyalella Kunkel, sensu lato, is revised, based on a review of type material for all previously described species, and on new material….https://elischolar.library.yale.edu/peabody_museum_natural_history_bulletin/1045/thumbnail.jp

First report of a freshwater amphipod (Gammaridea: Hyalellidae), Hyalella azteca (Saussure), from nonanchihaline waters of Bermuda

The discovery of the freshwater amphipod H. azteca in Bermuda is reported. No freshwater amphipods have previously been recorded from open water pond habitats on this western Atlantic island. H. azteca in Bermuda presumably dispersed from nearby North American populations; several possible methods for dispersal are discussed. Distinctive morphological features of Bermuda H. azteca are compared with similar characters reported for other New World populations

Pariphinotus Kunkel, 1910, the senior synonym of Heterophlias Shoemaker, 1933 (Crustacea: Amphipoda: Phliantidae)

The synonymy of the genera Pariphinotus and Heterophlias has been debated many times in the literature. Historically a distinction has been maintained between these two phliantid genera because of morphological differences reported in the literature by the original descriptors and subsequent workers. Our examination of specimens of both genera demonstrates Pariphinotus and Heterophlias to be synonymous. Heterophlias has been regarded as the valid genus by most authors; Pariphinotus, however, is shown to be the senior synonym of Heterophlias

New records of Hyachelia tortugae and H. lowryi.

12 pages : illustrations (some color), map ; 26 cm. Specimens collected by the American Museum of Natural History's Center for Biodiversity and Conservation as part of its ongoing program of Pacific sea turtle research and conservation. (Page 3)Amphipods of the genus Hyachelia collected during an epibiont survey conducted over three years (2009, 2010, and 2011) at Palmyra Atoll are reported. Both known species, i.e., Hyachelia tortugae Barnard, 1967, and Hyachelia lowryi Serejo and Sittrop, 2009, were collected from Pacific green turtles, Chelonia mydas (Linnaeus). Given the increased awareness of epibionts and the desire of researchers to make positive identifications, figures of the diagnostic features of both amphipod species are presented. The significance of the cooccurrence of these two species on Pacific green turtles (Chelonia mydas) is discussed

An updated and detailed taxonomical account of the large Branchiopoda (Crustacea: Branchiopoda: Anostraca, Notostraca, Spinicaudata) from the Yale North India Expedition deposited in the Yale Peabody Natural History Museum

Padhye, Sameer M., Lazo-Wasem, Eric A. (2018): An updated and detailed taxonomical account of the large Branchiopoda (Crustacea: Branchiopoda: Anostraca, Notostraca, Spinicaudata) from the Yale North India Expedition deposited in the Yale Peabody Natural History Museum. Zootaxa 4394 (2): 207-218, DOI: https://doi.org/10.11646/zootaxa.4394.2.

Redescription of Potamonautes sidneyi (Rathbun, 1904) (Decapoda, Potamonautidae) and description of a new congeneric species from KwaZulu-Natal, South Africa

A new species of freshwater crab, Potamonautes danielsi sp. n., is described from the southern region of the KwaZulu-Natal Province, South Africa. Potamonautes danielsi most closely resembles P. sidneyi which is re-described here, but can be distinguished by a suite of key morphological characters including carapace shape and width, slim pereopods, inflated propodi of the chelipeds, and the shape and terminal segment length:subterminal segment length ratio of the 1st gonopod. In a previous study (Gouws et al. 2015), a 9.2–11.8 % divergence was found in the mitochondrial COI and 16S genes of the P. sidneyi clade, allowing for the delineation of a new species. Despite the clear molecular distinction between the two species, it is difficult to separate them based on individual morphological characters, as there is a great deal of overlap even among key features. The new species is found in slow-moving mountain streams and pools at high altitudes between Umhlanga and Mtamvuna, in KwaZulu-Natal

Hyachelia tortugae Barnard 1967

Hyachelia tortugae Barnard, 1967 Figures 3, 4, and 5A Hyachelia tortugae is easily recognized based upon features of gnathopod 1 (males only) and pereopods 6 and 7. In males, article six of gnathopod 1 is very broad. The palm is sinuous and lined with stout robust setae. Additionally, four thick robust setae cover the posterodistal end of the sixth article. The dactyl is strikingly short, extending to only half the length of the palm. Gnathopod 2 (males), the palm is lined with robust setae and the proximoposterior corner protuberant. All the above characteristics can be seen through a microscope without dissection. However, the easiest way to recognize both males and females of this species is to examine the morphology of the sixth article of pereopods 6 and 7 (as well as pereopod 5, though this article is variable). If the distal margins of the sixth article of these pereopods are transverse, the specimen can be identified as H. tortugae; these margins are lobed and lined with grasping robust setae. Another distinct characteristic of H. tortugae is the shape of the uropods. The outer ramus of uropod 1 is broad and spatulate and its inner ramus is completely bare. The inner ramus of uropod 2 lacks setae, and is distinctly lanceolate.Published as part of Yabut, Mia G., Lazo-Wasem, Eric A., Sterling, Eleanor J. & Gómez, Andrés, 2014, New Records of Hyachelia tortugae Barnard, 1967, and H. lowryi Serejo and Sittrop, 2009 (Amphipoda: Gammaridea: Hyalidae), from Palmyra Atoll National Wildlife Refuge: Cooccurrence on Pacific Green Turtles (Chelonia mydas)., pp. 1-12 in American Museum Novitates 2014 (3809) on page 5, DOI: 10.1206/3809.1, http://zenodo.org/record/536754

Redescription of Potamonautes sidneyi (Rathbun, 1904) (Decapoda, Potamonautidae) and description of a new congeneric species from KwaZulu-Natal, South Africa

A new species of freshwater crab, Potamonautes danielsi sp. n., is described from the southern region of the KwaZulu-Natal Province, South Africa. Potamonautes danielsi most closely resembles P. sidneyi which is re-described here, but can be distinguished by a suite of key morphological characters including carapace shape and width, slim pereopods, inflated propodi of the chelipeds, and the shape and terminal segment length:subterminal segment length ratio of the 1st gonopod. In a previous study (Gouws et al. 2015), a 9.2–11.8 % divergence was found in the mitochondrial COI and 16S genes of the P. sidneyi clade, allowing for the delineation of a new species. Despite the clear molecular distinction between the two species, it is difficult to separate them based on individual morphological characters, as there is a great deal of overlap even among key features. The new species is found in slow-moving mountain streams and pools at high altitudes between Umhlanga and Mtamvuna, in KwaZulu-Natal

Hyachelia lowryi Serejo and Sittrop 2009

Hyachelia lowryi Serejo and Sittrop, 2009 Figures 5B, 6, and 7 The presence of a whiplike seta on the distal segment of the maxilliped palp (males only) immediately distinguishes the specimen as H. lowryi (figs. 5B and 6). This whiplike seta on the maxilliped can be seen in lateral view of the head without dissection (figs. 1B and 5B). In many of the male specimens examined the large second gnathopods were seen “reversed,” or upside down, reflecting an essentially prehensile condition. Males and females of H. lowryi can be identified by their strongly oblique anterodistal margin of pereopods 6 and 7. These anterior distal margins are covered by seven falcate, robust setae. The morphology of the uropods in H. lowryi is consistent among males and females: both rami are lanceolate and their posterior margins are armed with robust setae (figs. 6D and 6E). Another notable feature limited to males is the broadly convex palm of the gnathopod 1; the anterodistal corner is weakly produced and covered with fine scales. The dactyl length equals that of the palm. In male gnathopod 2 the palm exceeds the length of the dactyl and the proximoposterior corner lacks robust setate. When encountered together, adults of H. tortugae are generally much larger than H. lowryi. For example, males of H. tortugae are typically 7–8 mm and females are approximately 6–7 mm. Males of H. lowryi are smaller at about 4.5–5.0 mm in length, while females are typically around 4 mm. Although many of the aforementioned characteristics are useful in recognizing both species, the strong sexual dimorphism displayed in H. tortugae and H. lowryi limit several of these characteristics to the males. Females of H. lowryi do not possess the whiplike seta of the maxilliped and neither female Hyachelia species exhibit distinctive gnathopods. However, the diagnostic characters of the pereopods are observable in all adult specimens. Furthermore, the robust setae in the anterodistal corner of the pereopods are not fully developed in very small juveniles of H. tortugae, and their distal margin may appear oblique.Published as part of Yabut, Mia G., Lazo-Wasem, Eric A., Sterling, Eleanor J. & Gómez, Andrés, 2014, New Records of Hyachelia tortugae Barnard, 1967, and H. lowryi Serejo and Sittrop, 2009 (Amphipoda: Gammaridea: Hyalidae), from Palmyra Atoll National Wildlife Refuge: Cooccurrence on Pacific Green Turtles (Chelonia mydas)., pp. 1-12 in American Museum Novitates 2014 (3809) on pages 5-6, DOI: 10.1206/3809.1, http://zenodo.org/record/536754