Taxonomic tools for the identification of Allogenarchopsis bareilliensis n. sp. (Digenea: Hemiuroidea: Derogenidae) from Channa striata of Rohilkhand, India based on light and scanning electron microscopic studies

Abstract

The stomach of the freshwater snakehead murrel, Channa striata (n = 250) collected from fresh water habitats of Bareilly, Uttar Pradesh, India revealed Allogenarchopsis, a trematode parasite (Plagiorchiida: Derogenidae). An illustrated account of light (Olympus BX-53 with Cellsens software imaging system) and scanning electron microscopy (SEM) (Neo JCM-6000) of Allogenarchopsis bareilliensis n. sp. (prevalence 37 %, intensity 1-4 par/host) is provided. Light microscopy based studies warranting creation of a new species are the robust shape of the body with broad mid-body, blunt anterior and tapering posterior end, large ventral sucker, ratio of oral sucker: ventral sucker 1:3.5, pharynx broader than long, egg size small with relatively short egg filament, excretory vesicle U-shaped bifurcating at posterior end and terminating above intestinal shoulders. Key characteristics of the tegumental microtopography by SEM are (1) an aspinous tegument with a variety of papillae of different shapes (button-like, dome-shaped) distributed randomly on the dorsal and ventral surface (2) oral sucker and oral cavity muscular with fringed margins and morphologically different oral papillae (3) lip of ventral sucker papillated including two unequally spaced rows of papillae with sensory receptacles interspersed in between, (4) unique differentially texturized cytoplasmic processes on the ventral sucker and (5) body folds grooved, gradually becoming narrower towards posterior end. This is the first record and study on Allogenarchopsis from Channa of Rohilkhand, India using electron optics. We recommend that the newly recognized morphological features as revealed by light microscopy and SEM be utilized as taxonomic tools in future for the identification of the species.

Scanning Electron Microscope of Sclerodistomum aegyptiaca n. sp. (Digenea, Sclerodistomidae) from the Marine Fish Saurida undosquamis from the Suez Gulf, Red Sea, Egypt.

“…The present trematode has a characteristic topography by having several types of papillae on the tegumental surface surrounding oral and ventral sucker; small sensory, domed and button like papillae. Similar tegumentary papillae are reported by Gupta et al (2017) for Allogenarchopsis bareilliensis from Ghanna striata in India. Moravec (2009) studied the surface morphology of Nicolla skrjabini (Opecoelidae) from brown trout Salmo trutta fario in Czech Republic and showed several sensory papillae distributed at oral sucker and genital pore.…”

“…The presence of various types of papillae may reflect variations in their functions such as helping the worm to establish and maintain itself within its host through receiving information from surrounding environment (Ip and Desser, 1984). Furthermore, papillae represent mechano-rheo-chemo receptors that serve useful functions for orientation and feeding (Halton, 2004 andGupta et al 2017). Smyth and Halton (1983) supposed that these chemoreceptors give the worm the ability for selecting site of infection for host habitat and for micronutrients.…”

“…(Miller et al, 1972;Sobhon and Upathum, 1990), Fasciola spp. (Becker et al, 1980;Meaney et al, 2004), Zygocotyle lunata (Sotillo et al, 2012), Orthocoelium parvipapillatum (Anuracpreeda et al 2016) and Allogenarchopsis bareilliensis (Gupta et al, 2017). There is no enough information about the parasites that infect S. undosquamis fish and the factors that help in this process so, a further research works on these parasites are needed to explore the insufficient data on them.…”

Scanning Electron Microscopy of Catatropis Aegyptiacus N. Sp. (Trematoda: Notocotylidae) From Norway Brown Rat, Rattus Norvegicus (Muridae: Mammalia) From Egypt

“…But, the oral sucker outer rim has unciliated sensory papillae. This agreed with Catatropis indicus and Allogenarchopsis bareilliensis, where papillae played important role in the feeding (Lee et al, 1987) and sucking as well as acted as tango-rheo-or mechanoreceptive (Gupta et al, 2017) The present C. aegyptiacus was distinguished by ventral glands that secreted proteolytic enzymes (Harwood, 1939). Martin (1956) found that the median ventral ridge was formed of unicellular glands for adhesion in host caecal mucosa.…”

A Brief Account on Protozoan Infection in Asian Stinging Catfish, Heteropneustes Fossilis (Bloch, 1794) In Different Seasons of Bangladesh

“…Here, in Bangladesh we basically encounter three types of seasonal variation-summer, rainy and winter. A considerable number of studies have been done on the protozoan parasitic infestation in H. fossilis in relation to various parameters in our neighboring country, India (7)(8)(9)(10)(11)(12)(13)(14)(15)(16) . However, In Bangladesh, little work has been found to describe in detail about protozoan infestation pattern in relation to their environmental/seasonal effect in H. fossilis (17) .…”