Crustaceana

Abstract Abandoned, lost or otherwise discarded fishing gear (ALDFG) is a significant global issue in marine environmental policy, with impacts including plastic pollution, habitat degradation and entanglement of marine fauna. Static gear, such as pots and traps can continue to attract and trap animals even if lost or abandoned, in a process known as ‘ghost fishing’. The ongoing efficiency of the…

Abstract The recently described alpheid species Potamalpheops yamakawai Yamashita, Komai & Koreeda, 2024 is reported from Taiwan for the first time, with the identification confirmed by DNA barcoding of the 16S gene. The characteristics of the Taiwanese material are described and illustrated, together with colour photographs.

Abstract A study on the growth patterns of Callinectes arcuatus was carried out in the Teacapan-Agua Brava Lagoon System, Sinaloa, Mexico, based on monthly sampling conducted from August 2023 to July 2024. A total of 881 individuals were examined, with carapace width (CW) ranging from 25 to 115 mm. The length-weight relationship showed an isometric growth ( ; 95% CI: 2.87-3.02). The sex ratio rev…

Abstract Two species of Mysida of the genus Siriella , S. gracilis and S. thompsonii , are reported from western Mexico, in 12 and two new localities, respectively.

Abstract During the copepodid phase of copepod development, one new somite is added to the body at each moult, and this new somite is anterior and adjacent to the anal somite in which it was formed during the previous stage. A limb on this somite initially will appear as a bud on the following stage, and the bud will be reorganized into an adult-like limb on the next stage. If these attributes ar…

Abstract Freshwater shrimps are abundant in several rivers and streams of Puerto Rico. These species provide many ecosystem services, including cycling nutrients, connecting coastal and montane ecosystems, and serving as food for other organisms. Tracking the movements of individual shrimp is necessary to understand their responses to environmental and anthropogenic disturbances. To explore metho…

Abstract Salinity is a key physicochemical factor regulating essential biological processes in crustaceans (e.g., growth, development, reproduction), and its most direct effect is on osmoregulation. Palaemon carinicauda exhibits remarkable euryhaline tolerance, making it ideal for studying crustacean osmoregulation. To elucidate the molecular basis of its long-term freshwater adaptation, this stu…

Abstract Enterocytozoon hepatopenaei (EHP) is an obligate intracellular microsporidium that parasitizes shrimp, causing problems such as growth retardation and immune dysfunction in its hosts. Although EHP infection has been confirmed in various penaeid shrimp, the host range of EHP across crustacean families and the mechanism underlying its potential cross-family infection remain unclear, especi…

Abstract The aim of this study was to determine the effects of different mesh sizes and structure on catch efficiency in fyke net codends that are widely used for crayfish fishing in Turkey. The catch efficiency of experimental codends — 26 mm diamond, 34 mm hexagonal, and 42 mm diamond — was investigated as alternatives to the 34 mm diamond codend (control group), which is widely used in commerc…

Abstract In addition to redescriptions of Neoalbionella etmopteri (Yamaguti, 1939), N. longicaudata (Hansen, 1923) and Pseudocharopinus markewitschi (Gusev, 1951), the new species Neoalbionella centrophoris sp. nov., N. deaniae sp. nov., N. futokarasuzame sp. nov., N. genrokuzame sp. nov., N. hydrolagi sp. nov., and N. scymnodoni sp. nov. are described. All these species were found as parasites o…

Abstract The Caramote prawn Penaeus kerathurus (Forskål, 1775) is a key species in the Mediterranean’s commercial fisheries, but up until now, its stock status in northern Tunisia (Geographical Sub-Area 12) is poorly understood. The present study provides a comprehensive evaluation of the species’ exploitation status in this region. It combines seasonal biological sampling ( individuals) from the…

Abstract The complex history of Oniscorum squilliformium , Onischi squilliformi , Oniscus squilliformis , and Entoniscus cavolinii is reviewed. Oniscus squilliformis Zimmerman in Cavolini, 1792 is shown to be the senior synonym of Entoniscus cavolinii Giard, 1878, which is the type species of both Entione , Kossmann, 1881 and its junior synonym Grapsion Giard & Bonnier, 1886.

Abstract The ectosymbiont fauna associated with crustaceans in South American inland waters is characterized by a marked microendemism, as the species concerned appear to show high host specificity. The aim of the present study is to present a review of ciliated Protozoa reported as ectosymbionts on South American inland water malacostracans. The literature revealed the existence of three genera,…

Abstract Fieldwork in the Bijagos Islands, Guinea-Bissau, in 2023, yielded specimens of a species of Palaemon new to science. The specimens are herein described, illustrated, and compared with related species. We obtained sequences of the mitochondrial markers 16S and COI, as well as of the nuclear marker H3 of the Palaemon specimens from the Bijagos Islands. We used these sequences to analyse th…

Abstract Lobsters belonging to the family Scyllaridae, although known and described for centuries, are proportionally far less studied than their clawed and spiny lobster counterparts. Knowledge of their ecology and behaviour exists for some of the more commercially important species of scyllarids, but information on their reproductive biology is lacking. This is true for the commercially and eco…

Abstract Salinity represents a major environmental factor that affects shrimp growth, survival, development and reproduction. The ridgetail white prawn Palaemon carinicauda exhibits strong adaptability to low-salinity environments, making it an excellent model for investigating salinity adaptation mechanisms in crustaceans. The current study comprehensively assessed the impact of chronic low-sali…

Abstract Ocypode gaudichaudii is widespread on Peruvian sandy beaches, yet information on its population dynamics remains scarce despite its key role in beach ecosystem functioning. We conducted the first year-round assessment of population status and morphometric maturity of O. gaudichaudii on the central coast of Peru (Chancayllo beach). Specifically, we quantified sex ratio, size structure, an…

Abstract Moulting is of primary importance for all Crustacea, including the Decapoda. Properly dividing the stages of the moulting cycle is, therefore, a crucial prerequisite to explore the mechanism of moulting. In this paper, we studied the moulting stages in adult females of the freshwater Oriental prawn, Macrobrachium nipponense (De Haan, 1849), one of the major aquaculture species with a hig…

Abstract The identity of the poorly known freshwater crab, Stoliczia chaseni (Roux, 1934) (Potamidae) from Cameron Highlands in central Peninsular Malaysia is clarified, and unlike congeners, the species shows distinct sexual dimorphism in the degree of granulation on the carapace and chelipeds as well as in the relative proportions of the ambulatory legs. A new species, S. hoggi sp. nov., which …