Morphology of the trunk of Corynosoma hamanni (acanthocephala: Polymorphidae)

Abstract

Morphological study of Corynosoma hamanni (Linstow, 1892) was continued with the intention of presenting a morphological description of a single, well defined species.Sexual dimorphism is exhibited in body size, males being larger, and in body spination. Trunk spines are arranged in a pattern similar to that of Corynosoma semerme and do not extend onto the bursa as reported in the original description of C . humunni. Two testes, located side by side, are followed by six cement glands arranged in two groups of three glands each. One group is behind each testis. Cement ducts from glands on the right side cross over Saefftigen's pouch and join to form a reservoir on the left side; ducts from cement glands on the left side fuse forming a second reservoir. The two cement reservoirs unite before emptying into the ejaculatory duct. The bursa possesses rays i n its outer wall and numerous, well-developed papillae in the muscular cap.In females, a ruptured genital ligament sac is attached partially on the dorsal wall of the uterine bell and partially o n a column of six cells projecting from the bell's base into its lumen. Posteriorly the dorsal wall of the bell has two protruding pockets behind which occur ten cells composing the selector apparatus. Dorsal openings into the pseudocoelom occur on either side of the uterine bell. Two muscular tubes conduct eggs into the uterus. Female C . hamanni frequently forin genital vestibules in which the genital pore occurs along the dorsal wall and not, as reported for some species, at the anterior tip.Eggs of C . hamanni possess four membranes rather than the previously reported three.A morphological study of the presoma of Coynosoma hamanni (Linstow, 1892), undertaken to clarify inaccuracies in the original species description and to report several undescribed features, has been completed (Nickol and Holloway, '68). With the exception of taxonomically important features and studies on body wall ultrastructure, little attention has been given to acanthocephalan morphology subsequent to early investigations. Since early studies were conducted prior to any clear taxonomic understanding of the Acanthocephala, they often represented descriptions of two or more species mingled as one. In addition, many early works were concerned only with generalized acanthocephalan morphology rather than with comparisons among species. Yamaguti ('63) mentioned some of the confusion concerning acanthocephalan morphology which exists in the literature. It was therefore decided to continue morphological J. MOHPH., 130: 151-162.investigations of C . hamanni with the intention of presenting a morphological description of a single, well defined species. Ultrastructure, histology and organology should be subsequently studied. MATERIALSThis study is based on the collection of C . karnannz that provided material for a morphological study of the presoma (Nickol and Holloway, '68). Observations were made on specimens fixed in Lavdowsky's alcohol, formalin, and acetic acid mixture in proportions given by ...

Morphological and molecular characterization of two new species ofAndracantha(Acanthocephala: Polymorphidae) from New Zealand shags (Phalacrocoracidae) and penguins (Spheniscidae) with a key to the species

“…The circumbursal papillae observed on the bursa of A. leucocarboi (fig. 2C) appear to resemble closely the description given for the circumbursal papillae of Corynosoma hamanni by Holloway & Nickol (1970), both species being in the family Polymorphidae. These authors estimated that there were 35 papillae, each about 7.5 μm high and about the same in diameter, while our estimate was about 40, 10 μm in diameter.…”

Aspects of ecology and biogeography of Acanthocephala in antarctic seabirds

“…Those studied (27 from birds, 32 from fishes, and 2 from amphipods) had 18-22 rows of hooks with 11-16 hooks per row (the last 2-3 being large spines). The extent of spination on the trunk in males and females was identical to previous descriptions of C. hamanni (Edmonds, 1957 ;Jones and Williams, 1969 ;Holloway and Nickol, 1970 ;Zdzitowiecki, 1978b ; and others). They were also generally similar in the form of the lemnisci and the relative length of the proboscis receptacle.…”

“…According to these authorities, the size of the egg was one of few morphological characters that could be consistently used to separate these species (also see Holloway and Nickol, 1970).…”

Heptamegacanthus niekerki n. g., n. sp. (Acanthocephala: Oligacanthorhynchidae) from the south-east African insectivore Chrysospalax trevelyani (G�nther, 1875)

“…In H. niekerki males are generally larger than females (Table II). This unusual dimorphism has also been noted in species of the polymorphid genus Corynosoma Ltihe, 1904(Van Cleave, 1953Holloway & Nickol, 1970).…”