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Three New Species of Cercariae from Melanopsis Praemorsa (L. 1758, Buccinum)

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Three New Species of Cercariae from Melanopsis Praemorsa (L. 1758, Buccinum) Asian Pacific Journal of Tropical Biomedicine (2012)S1064-S1069 S1064 Contents lists available at ScienceDirect Asian Pacific Journal of Tropical Biomedicine journal homepage:www.elsevier.com/locate/apjtb Document heading doi:10.1016/S2221-1691(12)60362-1 襃 2012 by the Asian Pacific Journal of Tropical Biomedicine. All rights reserved. Three new species of cercariae from Melanopsis praemorsa (L. 1758, Buccinum) snails in Al-Bathan fresh water body, Palestine Sami Bdir, Ghaleb Adwan* Department of Biology and Biotechnology, An-Najah N. University, P. O. Box (7)-Nablus, Palestine ARTICLE INFO ABSTRACT Article history: Objective: Melanopsis praemorsa To investigate other new species of cercariae encountered in Received 30 June 2012 M. praemorsa Methods: M. praemorsa ( ) snails collected from Palestine. A total of 1 100 were 5 2012 Received in revised from July collected from Al-Bathan water body, Palestine, from November, 2010 to November, 2011. A 7 A 2012 M. praemorsa Results: ccepted ugust Cercariae in were obtained by emerging and crushing methods. Other Available online 28 August 2012 three new different specCercariaies of ce melanopsircariae ha vpalestiniae been identified from this sCercarianail. The smelanopsie species ( ) ( palestiniawere Xiphidiocercaria Cercaria melanopsi IV , palestiniaMicrocercous Keywords: ) ( ) M. praemorsa V and Longifurcate cercaria VI . The infection rate of Melanopsis praemorsa with these three different cercariae was (42.2%). Coinfection with Xiphidiocercariae Digenetic Trematodes and Longifurcate cercariae or Xiphidiocercariae and Microcercous cercariae has been noted and 1 23 Cercariae coinfection rate was . % among the infected snails. The highest cercarial infection rate was in (64 3 ) Longifurcate cercaria June . % . No infected snails were found in September. It was also noted that infected snails 17 22 Xiphidiocercaria attained a larger sConclusions:ize than unin fected ones and all infected snails had a size between - mm ( 20 ) Microcercous cercaria average mm . Our studies imply that there are potentially more nM.ew praemorsaspecies of Palestine trematodes in this area than were found until now. Due to the presence of infected and may be species of other snails, water resources could be contaminated by the emerging new cercariae, consequently attack the local people directly via the skin or are transferred to them by metacercariae ingestion. More surveys are needed to identify the real prevalence of the trematodes both in human and animal hosts, and also to determine the range of snail hosts of the parasite in enzootic areas of the disease, as well as the life cycle and biology of trematodes and its effects on man should be elucidated. 1. Introduction it is considered one of the most abundant snails present in fresh water bodies especially in Al-Bathan freshwater Freshwater snails play a vital role in the life cycle of body[3]. digenetic trematodes. These snails provide these parasites Three larval stages of digenetic trematodes were reported M. praemorsa with resources for development, reproduction and also from freshwater in Palestine. These larvae Cercaria melanopsi palestinia constitute a means of transport by which trematodes can were Xiphidiocercaria ( I), Cercaria melanopsi palestinia reach their next host. Most authors agree that trematodes Brevifurcate lophocercous ( Cercaria melanopsi palestinia were associated with molluscs before they adapted to other II) and Microcercous ( III) M. praemorsa hosts[1]. Trematodes are a diverse group of endoparasite [3]. Description new types of Cercariae from requiring intermediate host (molluscan and vertebrate) and and other snails from other countries has been reported in M. praemorsa definitive host to complete their life cycle. The distribution the literature. Therefore, it is expected that of fresh water mollusks varies with biological, physical may act as an intermediate host for many digenetic Melanopsis praemorsa and chemical characteristics[2]. trematodes of various vertebrates in Palestine. Seven types M. praemorsa M. praemorsa ( ) (L. 1758, Buccinum) is widely prevalent in of cercariae have been found in collected freshwater bodies of the Mediterranean region. In Palestine, from Yrmouk River, Jordan[4]. These included three types of Xiphidiocercariae, one type of a Brevifurcate *Corresponding author: Ghaleb Adwan, Department of Biology and Biotechnology, lophocercous cercaria, one type of a Microcercous Cercaria, An-Najah N. University, P. O. Box (7)-Nablus, Palestine. Fax: +970-9-2383589 and two types of Pleurolophocereous Cercariae. A total E-mail: [email protected] of four cercarial families and one cercarial group were Sami Bdir et al ./Asian Pacific Journal of Tropical Biomedicine (2012)S1064-S1069 S1065 Melanopsis identified from spp as follows: Heterophyidae: Cercariae were obtained from snails by emerging or crushing Haplorchis pumilio, H. taithui, Stellantchasmus falcatus and methods. In the emerging method snails were placed in Centrocestus formosanus Echinostomatidae: Echinochasmus ; the dishes containing distilled water and then, they were milvi; Cyathocotylidae, Philophthalmidae Monostome and exposed to artificial illumination for 12 h in the lab. In the group cercariae (probably Notocotylidae)[5]. Recently, a crushing method, snails were broken with tweezers and the total of eight different cercarial types have been reported soft tissues were placed between 2 slides and squashed. M. praemorsa in freshwater snail from the Kura River in Recovered larval trematodes were studied alive, unstained Azerbaijan[6-9]. These cercraiae included: three types of or vitally stained (0.5% brilliant cresyl blue or 0.5% neutral stylet cercaria, four types of virgulate cercaria and one type red) specimens. Some specimens were fixed in acetic acid- of lecithodendroid cercaria. Eleven types of cercariae were formalin-alcohol (AFA) solution and subsequently stained in Melanoides detected from the freshwater prosobranch snail acetocarmine. Measurements were taken on a minimum of 10 tuberculata collected from the Nile and irrigation system specimens of live and fixed larval trematodes. The behavior in several localities of Egypt[10]. These cercariae belong to of cercariae was observed using a dissecting microscope. four main type groups: two types xiphidiocercariae, two types furcocercous cercariae, four types pleurolophocercous 3. Results and three types gymnocephalous cercariae. In addition to these, twenty four trematode species comprising 19 M. praemorsa species of cercariae and 11 species of metacercariae (six From the total of 1 100 , 464 (42.2%) snails species occurred both as cercariae and metacercariae) were infected with three different cercariae. These new Cercaria melanopsi were identified in Central Europe from Lymnaea stagnalis cercariae were Xiphidiocercaria ( palestinia Cercaria melanopsi snails[11]. IV), Microcercous cercaria ( palestinia Cercaria melanopsi In Palestine, our knowledge on freshwater larval trematodes V) and Longifurcate cercaria ( palestinia is still poor. The present study describes three new species VI). The infection rates were 31.4%, 7.0%, and M. praemorsa of cercariae encountered in specimens of 3.8% for Xiphidiocercaria, Microcercous cercaria and collected from Al-Bathan freshwater body, Palestine. Longifurcate cercaria, respectively. These cercariae have not been described before from this snail. Coinfected snails with Xiphidiocercariae and Longifurcate crcariae or 2. Material and methods Xiphidiocercariae and Microcercous cercariae has been noted but rare, and the coinfection rate was 1.23% among the M. praemorsa A total of 1 110 snails were collected from infected snails. The highest cercarial infection rate was in Al-Bathan freshwater body in Palestine from November, June (64.3%). No infected snails were found in September. It 2010 to November, 2011. Examination of snails were carried was also noted that infected snails attained a larger size than out as described previously[3]. The collected snails were uninfected ones and all infected snails had a size between kept in a glass aquarium containing water and thin layer 17-22 mm (average 20 mm). Details of measurements of the of sediment from the same habitat of snails. Aquaria various structures of each type of cercariae are presented in were continuously aerated using air pumps. Snails were Table 1. examined for larval trematodes within 2-3 d after collection. Table 1. Cercaria melanopsi palestinia IV,V VI M. praemorsa Measurements (毺m) of the various structures of and encountered in snails collected from Al- Bathan freshwater body, Palestine. Cercaria melanopsi palestinia Type of Structure IV VI VI a Body length 65-120 270-330 400-420 60-110 380-410 a Body width 40-60 70-130 210-220 35-50 200-210b a Tail length 47-75 70-90 440-460 40-70 420-440 a Tail width 8-14 50-70 100-110 Oral sucker (diam.) 25-30 55暳58 80-90暳82-93 Ventral sucker (diam.) 20-25 50暳53 28暳28 Pharynx 6暳12 23暳30 8-12 Excretery vesicle (diam) 16暳22 (50-70) 暳(40暳56) 30暳60 Flame cell formula 2[(3) + (5) + (2) + (3)]=26 [(2+2+2)+(2)]=16 2[(1+1+1+1+1+1+1)+ (1+1+1+1+1+1+1) +[(1+1+1+1)]]=36 a b Measurements are given for live (upper values) and fixed (lower values) specimens. This measurement includes the length of tail rami which are 213-222 by 44-46 毺m (live) and 200-205 by 40-44 毺m (fixed). Sami Bdir et al ./Asian Pacific Journal of Tropical Biomedicine (2012)S1064-S1069 S1066 3.1. Cercaria melanopsi Palestinia IV (Figure 1 A, B; Table a flame cell formula 2[(3+5+2+3)]=26, but
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