Jorge A. Etchegoin

• National University of Mar del Plata

Simple Summary The apple snail is one of the most dangerous invasive species in freshwater environments. Using molecular and morphological tools, we re-describe an echinostomatid digenean parasitizing snails from two sites in the Buenos Aires Province, Argentina. The two stages found (i.e., rediae and metacercariae) demonstrate that the apple snail...

In South America, the knowledge of trematode diversity parasitizing freshwater fishes is still scarce, as less than 5% of the freshwater fish fauna has been examined for parasites. A similar situation applies to studies on digenean life cycles, which have become increasingly rare. Among the digenean families parasitizing freshwater fishes in the re...

The genus Maritrema Nicoll, 1907 (Platyhelminthes, Trematoda, Plagiorchiida, Microphallidae) comprises cosmopolitan species that predominantly parasitize birds. Although approximately 65 species have been described worldwide, including 6 for Argentina, molecular data referring to Maritrema species are still scarce worldwide, especially in South Ame...

In myxohaline environments, the digenean Maritrema bonaerense shares intermediate host species (crustaceans) and a definitive host species (bird) with another member of the family Microphallidae: Microphallus szidati. However, only M. szidati has been recorded parasitizing intermediate hosts in freshwater environments. Given that both species of mi...

Temporary ponds are ecologically valuable habitats and useful sites for studies of diversity, ecology, evolution, and climate change. Organisms inhabiting these environments have developed strategies to ensure their survival. However, little is known about the temporal dynamics and strategies of parasites in these habitats. A 4-year study was carri...

In the last years, a growing number of studies have focused on the search for biological indicators of human impact in freshwater environments. Given their susceptibility to different types of impact, larval digeneans have been considered as useful tools for the study of temporal variations in parasite communities. However, few studies have been ca...

Diphterostomum brusinae (Zoogonidae) is a digenean species that has been recorded worldwide parasitizing marine fishes. Several species have been synonymized with D. brusinae because they lack conspicuous morphological differences. However, due to the breadth of its geographic distribution and the variety of hosts involved in the life cycles, it is...

The larval digenean assemblages in snail hosts are influenced by biotic and abiotic factors and by environmental disturbances due to human activities. Given their susceptibility to different types of impact, they can be useful tools for the study of temporal variations in parasite communities. The study of temporal dynamics in prevalence and specie...

El molusco invasor Physa acuta (Physidae) y su asociación con el oligoqueto Chaetogaster limnaei (Naididae) en una laguna de la provincia de Buenos Aires (Argentina) The invasive mollusc Physa acuta (Physidae) and its association with the oligochaete Chaetogaster limnaei (Naididae) in a shallow lake (Buenos Aires, Argentina) RESUMEN: El molusco inv...

Penis anatomy is used to discriminate species of gastropods belonging to the family Cochliopidae; however, this characteristic may be affected by the presence of parasites. To evaluate the possible effect of parasites on penis length and number of papillae in Heleobia parchappii, 195 males were collected from the Nahuel Rucá Lagoon, Argentina. Male...

The gastropod Heleobia parchappii is distributed in lentic and lotic environments in the Pampas region of Argentina and is a host for at least 24 species of digeneans. Because ecoparasitological investigations of snail-digenean associations frequently lack knowledge of the structure and dynamics of the snail host population, the purpose of this stu...

Soft bottom intertidals of the Atlantic SW are dominated by the semi-terrestrial crab Neohelice granulata and the grapsid crab Cyrtograpsus angulatus . They are similar in size but C. angulatus is mainly a subtidal species, while N. granulata inhabits the intertidal zones, thus the two species overlap only during high tides in this area. Since thes...

The microphallids Microphallus szidati and Levinseniella cruzi parasitized at least three crustacean species as second intermediate host in Mar Chiquita coastal lagoon: the crabs Neohelice granulata and Cyrtograpsus angulatus and the grass shrimp Palaemonetes argentinus. Palaemonetes argentinus acts as host for both metacercariae in brackish and fr...

ABSTRACT: Parasitological examination of specimens of Heleobia parchappii (d’Orbigny, 1835) and Heleobia australis (d’Orbigny, 1835) (Mollusca, Cochliopidae), from freshwater and estuarine environments of the Bue- nos Aires province (Argentina), revealed the presence of 7 new larval stages of digeneans (cercariae) for these molluscan hosts. These l...

The importance of small-scale heterogeneity in local factors which overrides that of larger-scales factors, suggest that local factors play a major role in determining the richness and prevalence of larval digeneans in intertidal gastropods. The restricted distribution of the snail Heleobia australis along a 500 m transect in Cangrejo creek (Mar Ch...

Taking into account the ecological importance of the mollusc-digenean interactions in coastal environments, the possibility of using the coastline of Argentina as a model area to study the mollusc-digenean interactions in coastal zones, and the scarcity of revisions on this subject in South America, the aim of the present study is to review the inf...

SUMMARY In Mar Chiquita coastal lagoon (Argentina), the reefs of the invasive polychaete Ficopomatus enigmaticus (Serpulidae) serve as concentration areas for invertebrates and vertebrates and as potential foci of parasite transmission (mainly digeneans). To analyse the role of F. enigmaticus as facilitator of parasite transmission, and to evaluate...

Over a two-years period, a survey was carried out in order to increase the knowledge of digeneans parasitising the commonest intertidal gastropods on the Patagonian coast, Southwestern Atlantic Ocean. A total of 4,725 gastropods were examined. Six species of digenean parasitising four snail species were found; four of them were registered for first...

Larval digeneans have been proposed as indicators of abundance and diversity of vertebrate and other hosts as well as environmental disturbances. To evaluate its response to environmental changes and its potential use as an indicator of environmental fluctuations, the temporal stability of the community of larval digeneans in Heleobia conexa was co...

La necesidad de conservar o restaurar ambientes en el marco del cambio climático global, derivó en un incremento notable de estudios recientes sobre diversidad biológica. Investigaciones recientes valorizaron el estudio de los parásitos con ciclos de vida complejos como herramientas para estudiar comunidades bióticas y como bioindicadores de fluctu...

The nonparametric estimators of species richness are some of the most widely used extrapolation methods in studies of biodiversity. These studies need relative large samples to achieve total diversity (including rare species), and estimators are routinely used to alleviate this problem. In the existing literature, parasite communities have received...

The estuarine-dependent marine fish includes marine species that inhabit, at some stage of their life cycle, the Mar Chiquita coastal lagoon, Buenos Aires Province, Argentina. In the present study, we examined for parasites a total of 209 fishes belonging to following the estuarine-dependent marine species: Brevoortia aurea, Odontesthes argentinens...

Based on the examination of 234 specimens of the Brazilian flathead, Percophis brasiliensis (Percophidae), caught in the Argentinean and Uruguayan Seas, the list of digenean species parasitizing P. brasiliensis is increased from 6 to 9, including the specific identification of two species previously reported at the generic level. The three news dig...

The use of parasites as biological tags allowed the identification of two stocks of Brazilian sandperch Pinguipes brasilianus, in the Bonaerense region of the Argentine Sea. A total of 156 adult specimens of P. brasilianus were examined for parasites. Temporal variability in parasite burdens was assessed from fish caught seasonally in coastal water...

The genus TrifurWilson, 1917 (Siphonostomatoida, Pennellidae) comprises relatively large and conspicuous parasitic copepods infecting the body surface and gills of several marine fishes. Variations in the gross morphology have been used to discriminate between the existing species of Trifur, however all previous descriptions of these species are br...

As a result of the parasitological examination of the crabs, Uca uruguayensis (Ocypodidae) and Chasmagnathus granulatus (Varunidae), third-stage larval nematodes belonging to the family Acuariidae and to the genus Ascarophis were found in the crabs' hemocoel, both free and embedded in host tissues. Larval nematodes are described and illustrated her...

In this paper Steringotrema microacetabularis (Suriano et Martorelli, 1983) is redescribed and transferred to Bacciger Nicoll, 1924 in the Faustulidae Poche, 1926 based on newly collected material from the type-host, Paralichthys orbignyanus Valenciennes, 1839 and the type-locality, Mar Chiquita coastal lagoon, Buenos Aires Province, Argentina. A c...

The use of parasites as biological tags allowed the identification of three stocks of Brazilian sandperch Pinguipes brasilianus in the Argentine Sea. A total of 156 specimens caught during spring 2006, off the coasts of Buenos Aires Province (38°27′ S; 57°90′ W, n = 54), San Matías Gulf (42° S; 65°10′ W, n = 52) and Nuevo Gulf (42°09′ S; 64°05′ W,...

A new species, Paracapillaria argentinensis n. sp., is described from the pinguipedid fish Pinguipes brasilianus Cuvier, 1829 from waters off Mar del Plata, Argentina (38 degrees 08'S, 57 degrees 32'W) (prevalence 22.2%; mean intensity +/- SD, 4.42 +/- 5.19). The new species is assigned to the subgenus Paracapillaria Moravec, 1987. Of the 10 specie...

A new species, Acaenodera spinosior, is described based on specimens collected from the intestine of Conger orbignyanus Valenciennes (Pisces: Congridae) caught in waters off Mar del Plata (38 degrees 08'S, 57 degrees 32'W), Argentina. Five of 36 congers examined were parasitized (prevalence: 13.9%, mean intensity: 2.6+/-1.52, range: 1-5). The new s...

Neobrachiella spinicephala (Ringuelet, 1945) (Copepoda, Siphonostomatoida, Lernaeopodidae) is redescribed based on newly collected material from the Brazilian sandperch, Pinguipes brasilianus Cuvier, 1829, (the type host) from Mar del Plata, Argentina (the type locality). A description of the male is given for the first time. Although some differen...

Cardicola ambrosioi n. sp. (Digenea: Sanguinicolidae) is found in the blood vessels of liver and gills of the Brazilian flathead, Percophis brasiliensis Quoy and Gaimard, 1824 (Pisces: Percophidae), from Mar del Plata, Argentina. Among the 13 known species within Cardicola Short, 1953, the new species closely resembles Cardicola coridodacis Manter,...

A new nematode species Dichelyne (Cucullanellus) mariajuliae n. sp., is described based on specimens collected from the black drum, Pogonias cromis (Linnaeus, 1766), from Mar Chiquita coastal lagoon, Buenos Aires Province, Argentina (37 degrees 32'S, 57 degrees 19'W) (prevalence 75%, mean intensity 3.75). Among Dichelyne (Cucullanellus), the new sp...

Prosorhynchus australis Szidat, 1961 is redescribed based on specimens collected from Conger orbignianus Valenciennes, 1842 caught in waters off Mar del Plata (38°08´S, 57°32´W), Argentina. Twenty one out of 32 congers examined were parasitized by P. australis (prevalence 65.62%, mean intensity 22.8, range 1-122). A number of morphological features...

Blias marplatensis sp. nov. (Copepoda, Chondracanthidae) is described from adult specimens recovered from the red searobin Prionotus nudigula Ginsburg, 1950, from Mar del Plata, Argentina. Females of the new species differ from those of B. prionoti, the unique and type species of the genus, by the presence of processes and knobs in both head and tr...

Argentinochondria patagonensis n. gen., n. sp. (Copepoda: Chondracanthidae) is described from adult specimens recovered from the smooth kingklip Genypterus brasiliensis Reagan, 1903, from San Jorge Gulf, Patagonia, Argentina. The new genus is placed in the Chondracanthinae. Females of the new genus differ from other members of this subfamily in hav...

A new species of Steganoderma (Steganoderma) (Digenea: Zoogonidae) was found in the digestive tract of the southernmost, endemic and scale-less characid, Gymnocharacinus bergi, inhabiting thermal headwaters of the Valcheta Creek in northern Patagonia, Argentina. Steganoderma valchetensis n. sp. is included in the subgenus Steganoderma because of ha...

Recently collected copepod parasites on the narrownose smooth-hound shark Mustelus schmitti Springer revealed enough similarities with Perissopus galeorhini (Yamaguti, 1936) to be considered conspecific. Comparison of these specimens with the types of P. oblongus (Wilson, 1908) showed that P. galeorhini and P. oblongus are distinct species. Therefo...

During a parasitological survey of aquatic birds in Mar Chiquita coastal lagoon (Buenos Aires province, Argentina), specimens of Contracaecum Raillet & Henry, 1912 sp. were found in the esophagus and stomach of the great egret Egretta alba (Gmelin, 1789) (Aves: Ardeidae). The nematodes were identified as Contracaecum multipapillatum (Drasche, 1882)...

During a parasitological survey of aquatic birds in Mar Chiquita coastal lagoon (Buenos Aires province, Argentina), specimens of Contracaecum Raillet & Henry, 1912 sp. were found in the esophagus and stomach of the great egret Egretta alba (Gmelin, 1789) (Ayes: Ardeidae). The nematodes were identified as Contracaecum multipapillatum (Drasche, 1882)...

During the parasitological examination of the barn owl Tyro alba (Gmelin), from Mar Chiquita coastal lagoon in Argentina, specimens belonging to Synhimantus (S.) laticeps (Rudolphi, 1819) Railliet, Henry et Sissof, 1912 were obtained. Comparison of measurements of present specimens with Cram and Smogorzhevskaya's description of the same species, re...

Ancyracanthopsis winegardi Wong & Anderson, 1990 (Nematoda: Acuarioidea) is described from Larus dominicanus Lichtenstein (Aves: Laridae) on the Southwest Atlantic coast (38 degrees 42 minutes S, 59 degrees 47 minutes W). The main character used to distinguish species of Ancyracanthopsis is the morphology of the ptilina. Thus, although the specimen...

Two species of mazocraeid monogeneans are reported for the first time from Argentinean-Uruguayan engraulid fish hosts, Engraulis anchoita and Anchoa marini. Mazocraes australis n. sp. collected from the gills of E. anchoita is described: this new species can be distinguished from the other congenerics by the number of genital hooks in the copulator...

In the present paper we describe a new species of the genus Sciadiocara from Haematopus palliatus from the Mar Chiquita coastal lagoon (37 degrees 46' S, 57 degrees 27' W), Argentina. We provide two host records (H. palliatus and Larus dominicanus) for the genus, both from Buenos Aires province, Argentina. S. haematopodi n. sp. closely resembles S....

The parasitic copepod fauna of 182 specimens of Mustelus schmitti Springer from the coast of Mar del Plata, Argentina was investigated. Three species of parasitic copepods were identified: Nessipus orientalis Heller, 1865 from the buccal cavity, Perissopus oblongus (Wilson, 1908) from the edge of pectoral, pelvic, dorsal, anal and caudal fins and i...

Bomolochus globiceps (Vervoort et Ramirez, 1968) (Copepoda, Bomolochidae), a parasite of the atheriniid fish Odonthestes smitti from the coast of Mar del Plata, Argentina, is redescribed and illustrated; details of the armature of appendages and differences from the original description are given, and a new host record, O. argentinensis, is reporte...

New cercariae in Heleobia conexa (Mollusca: Hydrobiidae) from Mar Chiquita coastal lagoon. Parasitological examination of 3.273 individuals of Heleobia conexa from Mar Chiquita coastal lagoon, revealed the presence of 8 new larval stages of trematodes for chis molluscan host. These include one trioculate cercaria, two xiphidiocercariae, one furcoce...

Adults of Maritrema bonaerensis n. sp. (Digenea:Microphallidae) were collected from the intestine of the gulls Larus maculipennis and Larus atlanticus from Mar Chiquita coastal lagoon, Buenos Aires province, Argentina. The new species differs from M. pulcherrima Travassos, 1928 in having smaller sucker ratio, longer intestinal ceca, ovary not lobed...

Stephanoprora podicipei sp. n. parasite of great grebe Podiceps major Boddaert, 1785 (Aves, Podicipedidae) from Mar Chiquita coastal lagoon (Buenos Aires, Argentina) is described and illustrated. The new species presents common features with S. conciliata Dietz, 1909; S. manei Holcman-Spector et Olagüe, 1986; S. dogieli Holcman-Spector et Olagüe, 1...

In an attempt to clarify the number and identity of copepod species of the genus Chondracanthus Delaroche, 1811 parasitizing common hake Merluccius hubbsi Marini, 1933 from Argentinean waters, a total of 4,569 fish were examined. All of the 995 copepods of the genus Chondracanthus collected from hake showed identical morphology and were identified...

Qrcariae of the superfatniiy Opisthorchioidea in HeLmI-ria conaa Erom Mar Chiquita coastal lagwn. One magnicaudate and six pleiirolophocercous cercariae are described. They aii probably belong to thc superfamily Opisthorchioicka. Tliese cercariae develop in the snail Helenbin comm (Gaillard, 1974) cullected at Mar Ckiicpiita caastai lagmn (Buenos A...

Lernanthropus cynoscicola sp.n. (Copepoda: Lernanthropidae), a parasite of sciaenid fish Cynoscion striatus Cuvier from the coast of Argentina, is described and illustrated. The new species resembles five other species of Lernanthropus in general body shape, but it can be distinguished from them by the relatively short and tapered dorsal plate of t...

ABSTRACTTh:e aim of this paper is to analyze the parasite composition of Micropogonia~ju rnieri (white mouth croaker) in relation to host ontogeny, to its feeding habits and to the migratory movements of fish from the estuarine ama to the sea and viceversa. A total of 253 croakers were examined for parasites between 1985 and 1988. Fach fish was dis...

A total of 2164 common hake Merluccius hubbsi captured in the Argentine-Uruguayan Common Fishing Zone was examined for parasitic copepods. The fish were infested with Chondracanthus palpifer and Neobrachiella insidiosa f. lageniformis, the former parasitizing the buccal cavity and the latter the branchial arches. C. palpifer showed an increase in b...

IN MEMORIAM Dr Véronica A. Ivanov (1967‐2020); International Ichthyoparasitology Newsletter, No. 28, January 2021 (pp. 16-17)