Squamodiscs of the diplectanid Pseudorhabdosynochus epinepheli. Left, ventral squamodisc; right, dorsal squamodisc.Scanning electron microscopy of the scales in the squamodisc of the diplectanid Pseudorhabdosynochus jeanloui[1] Bar: 2 μm.Lamellodisc of the diplectanid Calydiscoides euzeti
Squamodiscs are epidermal structures, which are typical of and found only in certain monogeneans of the family Diplectanidae. There are, typically, two squamodiscs, one ventral and one dorsal, located on the haptor of the monogenean. Squamodiscs are usually made up of scales embedded in the epidermis, which appear from the outside as rodlets arranged in rows.[2]
According to the classical book of Bychowsky (1967),[3] “the Diplectanidae] have special paired attaching formations lying above the disc and also partially on it, on the dorsal and ventral sides in the shape of small rounded convexities equipped with numerous [...] thorn-shaped little hooks or thin thread-like plates located more or less in concentric rows ("squamodisc")".
Ultrastructural studies of squamodiscs [4][1] have shown that they include epidermally-embedded spines which are covered by the outer epidermal membrane. The spines are composed of a moderately electron-dense material with denser fibrils embedded within it.
A diplectanid genus Squamodiscus Yamaguti, 1934 was created but is now considered[5] a synonym of Diplectanum Diesing, 1858.
Some diplectanids, such as members of the genera Lamellodiscus or Calydiscoides, have a similar structure which is composed of lamellae, not rodlets; in this case the structure is called a lamellodisc.[2]
^ abKnoff, Marcelo; Cohen, Simone Chinicz; Cárdenas, Melissa Querido; Cárdenas-Callirgos, Jorge M.; Gomes, Delir Corrêa (2015). "A new species of diplectanid (Monogenoidea) from Paranthias colonus (Perciformes, Serranidae) off Peru". Parasite. 22: 11. doi:10.1051/parasite/2015011. PMC 4353888. PMID 25754099.
^ abOliver, Guy (2015). Les Diplectanidae Bychowsky, 1957 (Monogenea, Monopisthocotylea, Dactylogyridea). Systématique. Biologie. Ontogénie. Écologie. Essai de phylogenèse (thesis). Figshare. doi:10.6084/M9.FIGSHARE.1295274.
^Bychowsky, B. E. (1957) Monogenetic Trematodes. Their systematic and phylogeny. Akad. Nauka. USSR. English translation by the American Institute of Biological Science, Washington. 509 pp.doi:10.5962/bhl.title.7475
^Shaw, M. K. (2009). "The ultrastructure of the pseudohaptoral squamodiscs of Diplectanum aequans (Monogenea)". Parasitology. 82 (2): 231–240. doi:10.1017/S0031182000056961. ISSN 0031-1820. S2CID 85841816.
^Yamaguti, S.(1963). Systema Helminthum Volume IV Monogenea and Aspidocotylea: John Wiley & Sons.
Squamodiscs are epidermal structures, which are typical of and found only in certain monogeneans of the family Diplectanidae. There are, typically, two...
Monoplectanum are special among diplectanids in that they have only one squamodisc (generally two in species of other genera), hence the name of the genus...
Diplectanidae is a matter of controversy. Oliver considered that the absence of squamodisc and adhesive plate in the haptor and the position of the ovary made the...
2007 by Lassad Neifar & Louis Euzet. The name refers to the absence of squamodiscs and is derived from the Latin “sine”, indicating absence, and “discus”...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
grouper, and the second one (whose specific name refers to its large squamodiscs) was found on a four-banded butterflyfish, though it's been suggested...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal, which are small, with a length of 20-40 μm...
accessory adhesive organs on dorsal and ventral part of the haptor, called squamodiscs when they are made up of rodlets and lamellodiscs when they include lamellae...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
the new genus "disc well developed, with the accessory locomotory disc (squamodisc) peculiarly modified in such a way as to present numerous concentric rows...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
monogenean attaches itself to the gill of is host. The haptor bears two squamodiscs, one ventral and one dorsal. The sclerotized male copulatory organ, or...
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