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1

Ultrastructural re-description of Henneguya piaractus [Myxozoa], a parasite of the freshwater fish Piaractus mesopotamicus [Teleostei, Characidae] from the Paraquai River, Brazil

100%
Azevedo C., Marques D. K. S., Casal G., Amaral C. M. C., Silva E. V., Matos P., Matos E.
Acta Protozoologica
|
2010
|
tom 49
|
nr 2
115-120
2

Diaphorocleidus machacae n. sp. (Monogenea) infecting the gill lamellae of Brycon guatemalensis (Characiformes: Bryconidae) from the Rio Lacantun Basin in Chiapas, Mexico

100%
Mendoza-Franco E. F., Caspeta-Mandujano J. M., Ramirez-Martinez C.
Acta Parasitologica
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2019
|
tom 64
|
nr 1
3

Euryhaliotrema spp. (Monogenoidea: Dactylogyridae) parasitic on the gill lamellae of Perciform fishes in Moreton Bay, Queensland, Australia, with the description of Euryhaliotrema solenophallus sp. nov. from the silver moony Monodactylus argenteus (Linnaeus) (Monodactylidae)

100%
Kritsky D. C.
Acta Parasitologica
|
2019
|
tom 64
|
nr 2
4
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Morphological requirements in limulid and decapod gills: A case study in deducing the function of lamellipedian exopod lamellae

100%
Suzuki Y., Kondo A., Bergstrom J.
Acta Palaeontologica Polonica
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2008
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tom 53
|
nr 2
According to one hypothesis, the exopods of extinct lamellipedian arthropods functioned as gills. To evaluate this hypothesis, the growth rates in Limulus polyphemus for total gill surface, average area per single gill lamella and number of gill lamellae are documented. The rates are compared with corresponding rates in decapod crustaceans in order to make deductions on morphological constraints in multi−foliated gills. The growth rates are given as allometric scaling exponents relative to the animal dry−body weight. The comparisons reveal that each allometric exponent is similar among examined species irrespective of differences in gill morphology or animal body plans. The numerical growth of lamellae obviously is much smaller than the growth of the total respiratory surface. To fulfill these trends in multi−foliated gills, the overall profile tends to become conical, with the result that the surface area is a couple of magnitudes larger at the base of the cone than at the tip. This geometrical shape appears to keep the numerical value of the total respiratory area (total lamellar surface) proportional to the cube of the total number of lamellae. The situation is entirely different in animals with lamellipedian exopods. In the latter, lamellae are slender structures carried in a straight row and, as exemplified by Naraoia, their increase in number during the growth is only half that required for the exopod lamellae to have functioned as an arthropod multi−foliated gill cone.
5

Description of Maritrema portucalensis sp. nov. (Digenea, Microphallidae) parasite of Carcinus maenas (Crustacea, Decapoda) from Aveiro estuary, Northern Portugal

88%
Pina S., Russell-Pinto F., Rodrigues P.
Acta Parasitologica
|
2011
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tom 56
|
nr 4
Maritrema portucalensis sp. nov. (Digenea, Microphallidae) from Aveiro estuary, northern Portugal, is described on the basis of excysted metacercariae obtained from the gill lamellae of the shore crab Carcinus maenas (L.). M. portucalensis sp. nov. most closely resembles Maritrema subdolum Jägerskiöld, 1909, a species that also frequently uses C. maenas as second intermediate host. The new species differs from M. subdolum in having a narrower body at the level of testes and a smaller ovary and testes. Also, the digestive caeca presented various folds along their length, thickening in the terminal region. Moreover, the body surface was fully covered by tegumental spines provided with several teeth. To complement our morphological characterization and to identify M. portucalensis metacercariae, the ITS1 rDNA region of the cysts isolated from C. maenas was sequenced and compared with the corresponding available sequences of digenean trematodes belonging to the family Microphallidae. Alignments revealed 28 base-pair differences between the query-ITS1 and that of M. subdolum, and more importantly a 100% similarity with the sequence of Microphallidae sp. no. 15 cercaria from the snail Hydrobia ulvae. The last observation allowed us to establish an unequivocal association between cercaria known as Microphallidae sp. no. 15, and the metacercaria of M. portucalensis sp. nov. characterized in this work, contributing decisively to the clarification of its life cycle.
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