Sclerocollum Schmidt et Paperna, 1978

Al-Jahdali, Mohammed O., 2010, Helminth parasites from Red Sea fishes: Neowardula brayi gen. nov., sp. nov. (Trematoda: Mesometridae Poche, 1926) and Sclerocollum saudii sp. nov. (Acanthocephala: Cavisomidae Meyer, 1932), Zootaxa 2681, pp. 57-65: 60

publication ID 10.5281/zenodo.199330

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Sclerocollum Schmidt et Paperna, 1978


Sclerocollum Schmidt et Paperna, 1978 

The acanthocephalan genus Sclerocollum  was erected by Schmidt and Paperna (1978) for S. rubrimaris Schmidt et Paperna, 1978  from the intestine of three fish species ( Siganus rivulatus  , S. rostratus  and Pseudobalistes fuscus  ) in the Gulf of Eilat, Red Sea. They referred the genus to the family Rhadinorhynchidae Travassos, 1923  and subfamily Gorgorhynchinae  Van Cleave et Lincicome, 1940, differentiating it from Neorhadinorhynchus Yamaguti, 1939  by the conspicuous sclerotised plaques which are embedded in the tegument at the anterior region of the trunk (versus absent) and by the basal hooks of the proboscis which alternate with each other (versus arranged at the same level to form a ring). These two characteristics were also observed by Schmidt and Paperna (1978) in the original specimens of Neorhadinorhynchus robustus (Edmonds, 1964) Golvan, 1969  (from Siganus lineatus  on the Southern Great Barrier Reef). Therefore, they transferred this species to Sclerocollum  as a new combination. In their revision of the family Diplosentidae Tubangui et Masiluñgan, 1937  , Pichelin and Cribb (2001) transferred Neorhadinorhynchus  and Sclerocollum  to family Cavisomidae Meyer, 1932  , and on the basis of a striking similarity, they considered them as synonyms of Diplosentis Tubangui et Masiluñgan, 1937  . Accordingly, all species of Neorhadinorhynchus  and Sclerocollum  were transferred by Pichelin and Cribb (2001) to Diplosentis  as new combinations. Hassanine (2006) agreed with Pichelin and Cribb (2001) in transferring Sclerocollum  to family Cavisomidae  , but retained it as a valid genus, stating that in its members, the basal hooks of proboscis alternate with each other (not forming ring), a character lacking in Diplosentis  and its synonym, i.e. Neorhadinorhynchus  , where the basal hooks of proboscis are at the same level and forming a ring. Accordingly, 2 species of Sclerocollum  are currently recognized, i.e. S. rubrimaris Schmidt et Paprena, 1978  (type species) and S. robustus (Edmonds, 1964) Schmidt et Paprena, 1978  .