Glands and sensilla associated with the haptor of the gill-parasitic monogenean Tetraonchus monenteron

Kearn, Graham C.; Gowing, R.

doi:10.1016/0020-7519(89)90046-5

Cited by 12 publications

(6 citation statements)

References 6 publications

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“…Similar secretory systems (gland cells and haptoral reservoirs) have also been reported in Neocalceostomoides brisbanensis (Kearn et al 1995), Cichlidogyrus halli typicus (El‐Naggar & Kearn 1989), and Tetraonchus monenteron (Kearn & Gowing 1989). The site of exudation and the numbers of the haptoral reservoirs of the aforementioned species are different from those of Bravohollisia species.…”

Section: Discussionsupporting

confidence: 76%

“…In addition to the large gland cells producing the DED secretory bodies, there are also gland cells, associated with uniciliated structures and with marginal hooks, which produce oval secretory bodies of different sizes. These uniciliated structures in B. rosetta and B. gussevi are probably sensory receptors, similar to those described in C. halli typicus (El‐Naggar & Kearn 1989), Empleurosoma pyriforme (Ramasamy & Brennan 2000), and T. monenteron (Kearn & Gowing 1989). Gland cells associated with uniciliated receptors have also been reported in the anterior region in individuals of B. gussevi (Wong et al 2006) and also in Entobdella soleae (El‐Naggar & Kearn 1983).…”

Section: Discussionsupporting

confidence: 70%

“…None of these three species are reported to produce net‐like exudates externally. In N. brisbanensis , the exuded secretions are cement‐like (Kearn et al 1995), while for C. halli typicus (El‐Naggar & Kearn 1989) and T. monenteron (Kearn & Gowing 1989), there is no mention of the exuded secretions.…”

Section: Discussionmentioning

confidence: 99%

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Secretory products of the haptoral reservoirs and peduncular glands in two species of Bravohollisia (Monogenea: Ancyrocephalidae)

Wong

Brennan

Halton

et al. 2008

Invertebrate Biology

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Light and electron microscopy were used to characterize the structure of secretory cells and their products involved in attachment of two monogenean parasites of fish, in order to understand their role in the attachment process. In Bravohollisia rosetta and Bravohollisia gussevi, peduncular gland cells with two nuclei, granular endoplasmic reticulum, and Golgi bodies produce dual electron-dense (DED) secretory bodies with a homogenous electrondense rind and a less electron-dense fibrillar core (oval and concave in B. rosetta and oval in B. gussevi). The DED secretory bodies are altered as they migrate from the gland cell to the haptoral reservoir, the superficial anchor grooves, and into the gill tissues. The contents of the DED secretory bodies are exocytosed into the reservoirs, fibrillar cores persisting in the matrix, some of which condense, forming highly electron-dense spherical bodies. Small, oval, electron-dense bodies occur in the grooves, while no inclusions are visible in the homogenous exudate within the gill tissues. The single tubular extension of the reservoir enters a bifurcate channel within the anchor via a concealed, crevice-like opening on one side of the anchor. The channel directs secretions into the left and the right grooves via concealed apertures. The secretions, introduced into the tissues by the anchors, probably assist in attachment. The secretions are manifested externally as net-like structures and observed in some cases to be still attached to the point of exudation, on anchors detached from the gill tissues. This suggests that despite having the anchors detached, the worms can still remain anchored to the gill tissues via these net-like structures. Based on this, it is postulated that the net-like secretions probably function as a safety line to anchor the worm during the onset of locomotion and in doing so reduce the risk of tearing host tissues.Additional key words: net-like secretions, bioadhesive, attachment, anchor grooves Monogeneans have well-developed attachment systems to secure themselves onto their hosts. The majority of monogeneans use their head organs (anterior attachment organs) and associated secretions for temporary attachment during locomotion (Wong et al. 2006), while most gill-dwelling monogeneans have elaborate anchor and hook systems for gill attachment. In addition, some monogeneans, such as members of Bravohollisia and Caballeria, have a more complex attachment apparatus in which the anchor system incorporates adhesive secretions (Lim 1995). Large numbers of monogenean species (other than Bravohollisia and Caballeria) possess secretory gland cells and reservoirs for storage of secretory product in the peduncular and haptoral regions. Monogenean species reported to have haptoral reservoirs and associated glands are summarized in Table 1, which shows examples belonging to numerous taxa. The presence of haptoral reservoirs and secretory glands in the haptoral and peduncular regions suggests that these monogeneans release secretory products, but thus far only m...

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Section: Discussionsupporting

confidence: 76%

Section: Discussionsupporting

confidence: 70%

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Secretory products of the haptoral reservoirs and peduncular glands in two species of Bravohollisia (Monogenea: Ancyrocephalidae)

Wong

Brennan

Halton

et al. 2008

Invertebrate Biology

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“…The 'haptoral' reservoirs of both the type-species of this new genus and P. chaetodipteri (our reexamination) open at the surface apertures through which the anchors pass; this is also the case in Neocalceostomoides brisbanensis Whittington & Kearn, 1995(see Kearn, Whittington & EvansGowing, 1995, Cichlidogyrus halli typicus (Price & Kirk, 1967) (see El-Naggar & Kearn, 1989) and Tetraonchus monenteron (Wagner, 1857) (see Kearn & Gowing, 1989) (also see Wong et al, 2008). However, in species of Bravohollisia, Caballeria and Ancyrocephaloides, the elongate distal region of these reservoirs open into a concealed opening on one side of each of the four anchors and the secretions are channelled via an internal bifurcate duct to feed the right and left external grooves of the anchor (Lim & Gibson, 2008;Wong et al, 2008).…”

Section: Discussionmentioning

confidence: 93%

A new monogenean genus from an ephippid fish off Peninsular Malaysia

Lim

Gibson

2009

Syst Parasitol

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Sundatrema langkawiense n. g., n. sp. (Monogenea: Ancyrocephalidae) is described from the gills of the orbfish Ephippus orbis (Bloch) (Ephippidae) off the Island of Langkawi, Malaysia, in the Andaman Sea. This new genus has the ancyrocephalid characteristics of four anchors, 14 marginal hooks and two bars, but differs from other four-anchored monogenean genera, and notably from Parancylodiscoides Caballero & Bravo Hollis, 1961 (found on the ephippids Chaetodipterus spp. off Central and South America), by having a unique combination of features. These include a muscular genital sucker and a vas deferens and vagina on the same (sinistral) side of the body. It is similar to Parancylodiscoides in having four haptoral reservoirs opening at the anchoral apertures, four anchors, similar connecting bars and small marginal hooks. The new species is characterised by the above generic features and by possessing a small, short copulatory organ lacking an accessory piece. Diplectanum longiphallus MacCallum, 1915 (previously attributed to Ancyrocephalus Creplin, 1839, Tetrancistrum Goto & Kikuchi, 1917 and Pseudohaliotrema Yamaguti, 1953) is transferred to Parancylodiscoides as P. longiphallus (MacCallum, 1915) n. comb.

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“…In this way, the head forms a bridge between two adjacent secondary lamellae and the detached haptor is inserted beneath this bridge into the space between the lamellae. Uniike E. soleae, T. monenteron has sensilla on the haptor and KEARN and GOWING (1989) obsen/ed différences not only in the lengths of thèse sensilla but also in their activity; most are non-motile but those of one pair are vibratile. KEARN and GOWING pointed out that the motion of the vibratile sensilla would increase interaction with chemical substances in the water and that they might, therefore, be chemoreceptors.…”

Section: B the Tactile Sensé In Orientation Locomotion And Migrationmentioning

confidence: 99%

Stimuli de l'environnement, organes des sens et comportement des Monogènes juvéniles et adultes

Kearn

1993

Bull. Fr. Pêche Piscic.

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_ 105 - RÉSUMÉLorsque les larves de Monogènes (oncomiracidiums) établissent leur premier contact avec l'hôte, cela correspond à un changement fondamental dans leur mode de vie. La disparition de quelques structures sensorielles et l'acquisition de nouvelles en témoignent ; mais il existe certainement d'autres types de changements encore inconnus au niveau du système nerveux. Le développement larvaire lui-même, à ce moment là, est initié par des facteurs eux aussi inconnus. Nos connaissances du rôle des facteurs de l'environnement sur la vie des stades parasites juvéniles et adultes sont très limitées. Chez Entobdella soleae, parasite cutané de la Sole, il existe une réponse comportementale au changement de concentration d'oxygène ; chez l'adulte d'Encotyllabe caballeroi, chez qui des yeux se développent chez les post-larves, une réponse nette à la lumière existe. Les yeux persistants que l'on trouve chez d'autres Monogènes adultes, doivent avoir un rôle plus subtil dans le comportement. Le courant d'eau peut influencer le choix du site de fixation ou le développement dissymétrique du hapteur chez les Polyopisthocotylea, mais chez Entobdella soleae, parasite cutané, c'est le premier contact, et non une réponse au courant d'eau qui est déterminant dans l'orientation, la locomotion et éventuellement la migration. Ce contact est aussi certainement important dans la locomotion de certains parasites branchiaux comme Tetraonchus monenteron. L'attraction par des phé-romones n'a pas été démontrée chez les Monogènes et l'environnement turbulent de la plupart d'entre eux rend ce mode de communication peu adapté. Cependant, les relations particulières entre E. soleae et son hôte poisson plat procurent une situation où ce phénomène serait possible et avantageux. Bien que les hormones des hôtes apparaissent jouer un rôle dans la biologie de la reproduction des hématophages comme les Polystomes, la démonstration expé-rimentale manque encore. ENVIRONMENTAL STIMULI, SENSE ORGANS AND BEHAVIOUR IN JUVENILE/ADULT MONOGENEANS SUMMARYThere is a fundamental change in the life style as monogenean larvae (oncomiracidia) establish themselves on the host. This is reflected in the loss of some sensé organs and the acquisition of others and undoubtediy in deeper-seated changes in the nervous system about which nothing is known. At the same time, larval development is initiated by factors which are also unknown. Our knowledge of the rôle of environmental stimuli in the daily lives of the parasitic stages (juvéniles and adults) is rudimentary. A behavioural response to changing ambient oxygen concentrations is well-documented in the flatfish skin parasite Entobdella soleae and a vigorous response to light occurs in adult Encotyllabe caballeroi'\n which eyes develop in post-oncomiracidia. Persistent larval eyes in other adult monogeneans may have more subtle rôles in behaviour. Water currents may influence site sélection or asymmetry development in polyopisthocotylean gill parasites but in the skin parasite E. soleae contact réception, not a r...

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Glands and sensilla associated with the haptor of the gill-parasitic monogenean Tetraonchus monenteron

Cited by 12 publications

References 6 publications

Secretory products of the haptoral reservoirs and peduncular glands in two species of Bravohollisia (Monogenea: Ancyrocephalidae)

Secretory products of the haptoral reservoirs and peduncular glands in two species of Bravohollisia (Monogenea: Ancyrocephalidae)

A new monogenean genus from an ephippid fish off Peninsular Malaysia

Stimuli de l'environnement, organes des sens et comportement des Monogènes juvéniles et adultes

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