A new species of Rhinonastes (Monogenoidea, Dactylogyridae), nasal parasite of Prochilodus argenteus (Actinopterygii, Characiformes) from Brazil

Monteiro, Caio Márcio de Oliveira; Brasil-Sato, Marilia de Carvalho

doi:10.2478/s11686-014-0278-3

Cited by 4 publications

References 14 publications

(12 reference statements)

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Two new species of Monopisthocotyla (Dactylogyridea: Dactylogyridae) parasitizing the nasal cavities of Bryconops melanurus (Characiformes: Iguanodectidae) from coastal drainages of the Eastern Amazon, Brazil

SANTOS-NETO,

PAIXÃO,

DOMINGUES

2024

Zootaxa

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The present study integrates molecular and morphological data to support the proposal of new species of Telethecium Kritsky, Van Every & Boeger, 1996 and Diaphorocleidus Jogunoori, Kritsky & Venkatanarasaiah, 2004 from the nasal cavities of Bryconops melanurus (Bloch) of the coastal drainages of the Eastern Amazon. Telethecium tiquira sp. n. is characterized by possessing a male copulatory organ (MCO) with two circular sclerotized brims on the base, a coiled tubular shaft having 1 ½ counterclockwise rings, an accessory piece with enlarged base, pincer-shaped at the distal portion; a sclerotized calyx-shaped vaginal vestibule, and hooks with proximal shank dilatation comprising 3/4 of the shank length. Also, Telethecium tiquira sp. n. can be easily distinguished from other species of the genus by the absence of a protruding bag located at the level of the copulatory complex. Diaphorocleidus forficata sp. n. is characterized by having a MCO with two counterclockwise rings, circular sclerotized tandem brim associated with the base of the MCO; accessory piece non-articulated with the MCO, bifurcate, pincer-shaped; vaginal pore sinistral-ventral with opening marginal, vaginal canal sclerotized, elongated, comprising one loop in the proximal portion before entering to the seminal receptacle; ventral anchor with shaft elongated and evenly curved on the axis; point short and slightly curved, and hooks similar in shape and size, hooks with proximal dilatation comprising approximately ½ of the shank length. Furthermore, D. forficata sp. n. is supported by phylogenetic analysis based on sequences of the partial 28S rDNA gene, which placed D. forficata sp. n. in a well-supported clade of Diaphorocleidus spp. of characiform fishes. Thus, the two new species described here expand our knowledge about the diversity of monopisthocotylan parasites from the nasal cavities of Neotropical fishes. The findings of this study provide valuable insights into the biodiversity of the region and highlight the importance of further research in this area.

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Two new species of Monopisthocotyla (Dactylogyridea: Dactylogyridae) parasitizing the nasal cavities of Bryconops melanurus (Characiformes: Iguanodectidae) from coastal drainages of the Eastern Amazon, Brazil

SANTOS-NETO,

PAIXÃO,

DOMINGUES

2024

Zootaxa

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Spatial Distribution ofGyrodactylus salmonis(Monogenea) on the Body of Captive FingerlingOncorhynchus mykiss, Including Attachment Within the Olfactory Chamber

Lari

Cone

Goater

et al. 2016

Journal of Parasitology

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Gyrodactylus salmonis is a common ectoparasite on the fins and body of North American salmonids in fresh water. In this study, the spatial distribution of G. salmonis on 60 captive hatchery-reared rainbow trout, Oncorhynchus mykiss , is reported. The highest parasite densities occurred on 5 × 5-mm(2) sections of the dorsal fin followed by the trunk, other fins, and the olfactory chamber, with the lowest densities on the head. The finding of infections within the olfactory chamber of 93% of the fish was unexpected. One possibility is that such infections represented spillover from high-density infrapopulations that occur on the skin and fins. However, this possibility is unlikely, because worm densities at various sites along the body surface of infected fish did not correlate with densities within the olfactory chamber. The parasite conceivably enters the chamber either via water incurrent or by crawling in from the head and subsequently remaining at this site to feed and reproduce. Results from scanning electron microscopy are consistent with physical modification to the olfactory epithelium associated with the attachment/reattachment of the opisthaptor and epithelial grazing.

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Monogenoidean parasites of the nasal cavities of Bryconops melanurus (Characiformes: Iguanodectidae) of the coastal drainages of the Eastern Amazon, Brazil: Proposal of Guamacotyle forficata n. gen. n. sp. (Polyonchoinea: Dactylogyridae)

Neto

Paixão

Domingues

2022

Preprint

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Two new species of Monogenoidea (Telethecium tiquira n. sp. and Guamacotyle forficata n. gen. n. sp.) from the nasal cavities of Bryconops melanurus (Bloch) are described from the Brazilian Eastern Amazon. Telethecium tiquira n. sp. is characterized by possessing a male copulatory organ (MCO) with two circular sclerotized brims on the base, a coiled tubular shaft having 1 ½ counterclockwise rings; an accessory piece with enlarged base, pincer-shaped at the distal portion; asclerotized calyx-shaped vaginal vestibule; and hooks with proximal shank dilatation comprising 3/4 of the shank length. The new species also differs from the congeners by lacking the protruding bag located at level of the terminal male genitalia.The monotypic Guamacotyle n. gen. is characterized by having a MCO with counterclockwise rings; an accessory piece non articulated to MCO, clamp-shaped; a sclerotized vagina with sinistrolateral aperture; ventral anchors larger than dorsal anchors; and hooks with similar sizes. The proposal of the new genus is also supported by phylogenetic analysis based on 28S rDNA, which supports the close relationship of Guamacotyle n. gen. with Cacatuocotyle papilionis and Diaphorocleidus spp., all parasites of Neotropical fishes.

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A new species of Rhinonastes (Monogenoidea, Dactylogyridae), nasal parasite of Prochilodus argenteus (Actinopterygii, Characiformes) from Brazil

Cited by 4 publications

References 14 publications

Two new species of Monopisthocotyla (Dactylogyridea: Dactylogyridae) parasitizing the nasal cavities of Bryconops melanurus (Characiformes: Iguanodectidae) from coastal drainages of the Eastern Amazon, Brazil

Two new species of Monopisthocotyla (Dactylogyridea: Dactylogyridae) parasitizing the nasal cavities of Bryconops melanurus (Characiformes: Iguanodectidae) from coastal drainages of the Eastern Amazon, Brazil

Spatial Distribution ofGyrodactylus salmonis(Monogenea) on the Body of Captive FingerlingOncorhynchus mykiss, Including Attachment Within the Olfactory Chamber

Monogenoidean parasites of the nasal cavities of Bryconops melanurus (Characiformes: Iguanodectidae) of the coastal drainages of the Eastern Amazon, Brazil: Proposal of Guamacotyle forficata n. gen. n. sp. (Polyonchoinea: Dactylogyridae)

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