Papers by Christopher Ashelby
Zootaxa, 2018
The shrimp genus Palaemon Weber, 1795 and its related genera in Taiwan are reviewed based on newl... more The shrimp genus Palaemon Weber, 1795 and its related genera in Taiwan are reviewed based on newly collected specimens, whilst older records are critically reviewed. Five genera and 11 species are now known to occur in Taiwan, although there are no recent records for Palaemon modestus (Heller, 1862), which could be nationally extinct. The records of P. debilis Dana, 1852 and Nematopalaemon tenuipes (Henderson, 1893) in Taiwan are confirmed. Three genera, namely Brachycarpus Spence Bate, 1888, Leander Desmarest, 1849 and Leandrites Holthuis, 1950, each with one species are reported for the first time from Taiwan.
Crustacean Research, 2018
A new species of Palaemon is described from Cần Giớ District, Vietnam. This species has previousl... more A new species of Palaemon is described from Cần Giớ District, Vietnam. This species has previously been reported from Vietnam as a colour morph of Palaemon sewelli (Kemp, 1925), to which it is clearly morphologically very closely related. However, the new species can be separated from P. sewelli through the position of the branchiostegal tooth relative to the branchiostegal groove, the shape of the suborbital lobe, a hirsute carapace and abdomen and the colour pattern of living individuals. The description of this new species brings the number of species of Palaemon known from Vietnam to eleven species. LSID urn:lsid:zoobank.org:pub:71A2D71F-1D99-42FC-977D-156BF4825C80
Journal of the Marine Biological Association of the United Kingdom
A recent survey of The Canyons Marine Conservation Zone provided noteworthy records of several cr... more A recent survey of The Canyons Marine Conservation Zone provided noteworthy records of several crustacean species, which are presented here. The geographic or bathymetric ranges of several species are considerably extended, while the genus Rhachotropis, which has not previously been reported from British waters, is represented by two species. Other species that were previously only known in British waters from very few, often historical, records are also reported.
The present paper is the second in a series detailing the crustacean fauna of Harwich harbour and... more The present paper is the second in a series detailing the crustacean fauna of Harwich harbour andthe Stour (Essex & Suffolk) and Orwell (Suffolk) estuaries and reports on the known amphipodfauna. Eighty-three species of amphipod are recorded, four of which are not native to Britain.
Zoology in the Middle East
Crustaceana, 2006
Page 1. CONTRIBUTIONS TO THE BIOGEOGRAPHICAL KNOWLEDGE OF SOME DECAPOD CRUSTACEANS IN THE BRITISH... more Page 1. CONTRIBUTIONS TO THE BIOGEOGRAPHICAL KNOWLEDGE OF SOME DECAPOD CRUSTACEANS IN THE BRITISH ISLES BY CHRISTOPHER W. ASHELBY1) Unicomarine Ltd., 7a Diamond Centre, Works Road ...
Zoology in the Middle East, 2012
Crustaceana, 2006
Page 1. CONTRIBUTIONS TO THE BIOGEOGRAPHICAL KNOWLEDGE OF SOME DECAPOD CRUSTACEANS IN THE BRITISH... more Page 1. CONTRIBUTIONS TO THE BIOGEOGRAPHICAL KNOWLEDGE OF SOME DECAPOD CRUSTACEANS IN THE BRITISH ISLES BY CHRISTOPHER W. ASHELBY1) Unicomarine Ltd., 7a Diamond Centre, Works Road ...
A new species of Palaemon, P. vicinus spec. nov., is described from the tropical eastern Atlantic... more A new species of Palaemon, P. vicinus spec. nov., is described from the tropical eastern Atlantic. The new species is very close to P. elegans Rathke, 1837, under which name it was previously recorded from West Africa. Palaemon vicinus spec. nov. is easily separated from P. elegans by possessing a small tooth on the fifth abdominal pleuron (quadrate in P. elegans) and by having 2-3 rows of setae in the grooming brush of the fifth pereiopod (4-5 in P. elegans). The discovery of the new species amongst material identified as P. elegans further highlights the need to reassess species level characters in the genus Palaemon.
The mandibles of caridean shrimps have been widely studied in the taxonomy and functional biology... more The mandibles of caridean shrimps have been widely studied in the taxonomy and functional biology of the group. Within the Palaemonoidea the mandibles reach a high level of structural diversity reflecting the diverse lifestyles within the superfamily. However, the majority of studies have been restricted to light microscopy, with the ultrastructure at finer levels poorly known. This study investigates the mandible of nine species belonging to six of the recognised families of the Palaemonoidea using SEM and analyses the results in a phylogenetic and dietary framework. The results of the study indicate that little phylogenetic information is conveyed by the structure of the mandible, but that its form is influenced by primary food sources of each species. With the exception of Anchistioides antiguensis, all species examined possessed cuticular structures at the distal end of the pars molaris (molar process). Five types of cuticular structures are recognised herein, each with a unique form, but variable in number, placement and arrangement. Each type is presumed to have a different function which is likewise related to diet. . 2005. Mouthpart-atlas of arctic sympagic amphipods-trophic niche separation based on mouthpart morphology and feeding ecology. Journal of Crustacean Biology 25(3):401-412 Aucoin S, Himmelman JH. 2010. A first report on the shrimp Pontonia sp. and other potential symbionts in the mantle cavity of the penshell Pinna carnea in the Dominican Republic.
PeerJ, 2015
The mandibles of caridean shrimps have been widely studied in the taxonomy and functional biology... more The mandibles of caridean shrimps have been widely studied in the taxonomy and functional biology of the group. Within the Palaemonoidea the mandibles reach a high level of structural diversity reflecting the diverse lifestyles within the superfamily. However, the majority of studies have been restricted to light microscopy, with the ultrastructure at finer levels poorly known. This study investigates the mandible of nine species belonging to six of the recognised families of the Palaemonoidea using SEM and analyses the results in a phylogenetic and dietary framework. The results of the study indicate that little phylogenetic information is conveyed by the structure of the mandible, but that its form is influenced by primary food sources of each species. With the exception of Anchistioides antiguensis, all species examined possessed cuticular structures at the distal end of the pars molaris (molar process). Five types of cuticular structures are recognised herein, each with a unique...
Marine Biodiversity Records, 2012
ABSTRACT
Marine Biodiversity Records, 2011
The present contribution reports on a small collection of caridean shrimps from Qatar. Six specie... more The present contribution reports on a small collection of caridean shrimps from Qatar. Six species are reported upon, three of which are new additions to the caridean fauna of the Persian Gulf, also representing the first records for the crangonid genus Philocheras and the family Pandalidae from the area. An annotated checklist of species known to date from the Persian Gulf is provided, totalling 59 species.
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Papers by Christopher Ashelby