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Start Over Creator Gil de Pertierra, Alicia A.

1. A new genus and species of the Monticelliinae (Eucestoda: Proteocephalidea), a parasite of Pseudoplatystoma fasciatum (Pisces: Siluriformes) from the Paraná River basin (Argentina), with comments on microtriches of proteocephalideans

Creator:
Arredondo, Nathalia J., de Chambrier, Alain, and Gil de Pertierra, Alicia A.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
Cestoda, Proteocephalidea, taxonomy, morphology, barred sorubim, Pimelodidae, and South America
Language:
English
Description:
This paper describes Regoella brevis gen. n. et. sp. n. (Proteocephalidea: Monticelliinae), a parasite of the intestine of the barred sorubim Pseudoplatystoma fasciatum (Linnaeus) from the Paraná River basin. The new genus is placed in the Monticelliinae because of the cortical position of the genital organs. It differs from all known genera included in the Monticelliinae by the following combination of characters: 1) a quadrangular scolex with a truncated conical apex and formed by four lobes separated by grooves; 2) uniloculate suckers of inverted triangular shape possessing a small cone-shaped projection at each corner of the anterior margin; 3) strobila consisting of a low number of proglottides; 4) testes arranged in one dorsal field; 5) a cirrus-sac, which represents more than one half of the proglottis width, cirrus surrounded by conspicuous chromophilic gland cells; 6) a butterfly-shaped and strongly lobulate ovary; and 7) formation of uterus of type 2. The examination of the tegument surface with scanning electron microscopy revealed the occurrence of three types of microtriches: acicular and capilliform filitriches and gladiate spinitriches. The new species is the eighth proteocephalidean reported from P. fasciatum, six of which are commonly found in the Amazon and Paraná River basins.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

2. Margaritaella gracilis gen. n. et sp. n. (Eucestoda: Proteocephalidea), a parasite of Callichthys callichthys (Pisces: Siluriformes) from the Paraná River basin, Argentina

Creator:
Arredondo, Nathalia J. and Gil de Pertierra, Alicia A.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
Proteocephalinae, taxonomy, morphology, catfish, Callichthyidae, and Neotropical region
Language:
English
Description:
Margaritaella gracilis gen. n. et sp. n. (Proteocephalidea: Proteocephalinae) found in the intestine of Callichthys callichthys (Linnaeus) from the Paraná River basin is described. The new genus is placed in the Proteocephalinae because of the medullary position of the genital organs. It differs from all known genera included in the Proteocephalinae by the following combination of characters: 1) scolex with a conspicuous cluster of drop-shaped gland cells posterior to suckers; 2) strobila with a low number of proglottides, all much longer than wide; 3) testes arranged in one field, composed of two parallel rows of testes separated by the uterus; 4) ovary delicate, H-shaped, with branches slender and deeply folliculate at the edges, located at 25-35% from the posterior end; 5) uterus largely extended posterior to the ovary but not reaching the end of proglottis; and 6) vitelline follicles in two narrow lateral bands, largely extended posterior to the ovary. Scanning electron microscopy revealed three types of microtriches on the tegument surface: acicular and capiliform filitriches and gladiate spinitriches. The relative size of the ovary, a character recently used in the systematics of the proteocephalidean cestodes, was calculated for the new species and compared with other species of the group. M. gracilis is the first record of a proteocephalidean cestode parasitizing a callichthyid catfish.
Rights:
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3. Pomphorhynchus omarsegundoi sp. n. (Acanthocephala: Pomphorhynchidae), parasite of the banded knifefish Gymnotus carapo (Gymnotiformes: Gymnotidae) from the Paraná River basin, Argentina

Creator:
Arredondo, Nathalia J. and Gil de Pertierra, Alicia A.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
Acanthocephala, Pomphorhynchidae, Pomphorhynchus omarsegundoi, Gymnotus carapo, and Argentina
Language:
English
Description:
Pomphorhynchus omarsegundoi sp. n. from Gymnotus carapo Linnaeus from the Paraná River basin in Argentina is described in this paper. The new species is characterised by having a small body; a non-spirally twisted long neck forming an inconspicuous asymmetrical bulb more developed dorsally than ventrally; a proboscis almost cylindrical, with 11 to 12 longitudinal rows of 5 to 7 (usually 6) hooks each; presence of an apical organ; a mean neck/body ratio of about 1/8; and a post-equatorial male reproductive system, occupying 35-42% of total length. The new species can be easily distinguished from the other four South American pomphorhynchid species by the inconspicuous asymmetrical bulb and the lower number of hooks per row. Pomphorhynchus omarsegundoi is the second acanthocephalan recorded from G. carapo in the Paraná River basin.
Rights:
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4. Pseudoacanthocephalus lutzi (Hamann, 1891) comb. n. (Acanthocephala: Echinorhynchidae) for Acanthocephalus lutzi (Hamann, 1891), parasite of South American amphibians

Creator:
Arredondo, Nathalia J. and Gil de Pertierra, Alicia A.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
Acanthocephala, Echinorhynchidae, Acanthocephalus lutzi, Pseudoacanthocephalus, Rhinella, amphibians, and Argentina
Language:
English
Description:
Acanthocephalus lutzi (Hamann, 1891) is proposed to be transferred to the genus Pseudoacanthocephalus Petrochenko, 1956 based on the type material from Rhinella marina (L.) from Brazil and recently collected material from R. arenarum (Hensel) from Argentina. Pseudoacanthocephalus is characterised by the following features: a cylindrical trunk without spines, a cylindrical proboscis, testes in tandem, a compact cluster of cement glands, a nearly terminal male genital pore, a ventral and sub-terminal female genital pore, and egg without polar prolongations, containing a holoechinate acanthor. Pseudoacanthocephalus lutzi comb. n. has a proboscis armature of 14-18 longitudinal rows of 5-8 hooks each, with all roots formed by a posteriorly directed longitudinal spatulate sheet having a central rib, and an inconspicuous sheet directed anteriorly; a variable number (4, 5 or 6) of cement glands; a cerebral ganglion located near the base of the proboscis receptacle; digitiform to claviform lemnisci, as long as, or slightly shorter or slightly longer than the proboscis receptacle; a sigmoid-shaped posterior end in males; an egg with a conspicuous fibrillar coat; and one of the larval hooks more robust and different in shape than the others. Additionally, the type material of Acanthocephalus saopaulensis Smales, 2007 from Rhinella icterica (Spix) from Brazil and a paratype of A. caspanensis Fernández et Ibarra Vidal, 1992 from R. spinulosa (Wiegmann) from Chile were studied. Acanthocephalus saopaulensis is considered conspecific with P. lutzi and A. caspanensis is transferred to Pseudoacanthocephalus because it possesses all the characters of the genus mentioned above. The use of characters such as egg morphology and host ecology for distinguishing Acanthocephalus from Pseudoacanthocephalus is also discussed.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public