Martin L. Adamson

Redescriptions of five species of Heth Cobb, 1898 (Rhigonematidae: Nematoda) from South American diplopods

SummaryFive species of Heth Cobb are redescribed from South American diplopods. Heth spinosum Artigas, 1929 from Rhinocricus nattereri varians from the island of São Sebastiao, Brazil, is most similar to H. duvidosum Artigas, 1929, H. perarmatum Dollfus, 1952, H. bifidispiculum Adamson, 1982 and H. mauriesi Adamson, 1982 but is distinguished from these species by details of cephalic cuticular ornamentation in the female and the strongly hooked spicule in the male. H. artigasi Dollfus, 1952 from R. flavocinctus from Venezuela is most similar to H. macrocephala Kloss, 1965 but is distinguished by details in the structure of cephalic cuticular ornamentation of the female. H. schubarti Dollfus, 1952 is placed in synonymy with H. artigasi. H. travofilhoi Dollfus, 1952 from R. nattereri varians from the island of São Sebastiao, Brazil, is close to the preceding two species but differs in possessing a plate of thickened cuticle posterior to the anus in the male. H. tuzetae Dollfus, 1952 from Pseudonannolene tricolor from São Paulo, Brazil, resembles H. sinediscus Kloss, 1965 in lacking a ventral sucker in the male. It differs from the latter in cephalic cuticular ornamentation of the female and in possessing fields of postanal cuticular bosses in the male. H. maicuru Kloss, 1961, redescribed from type material from Scaphiostreptus buffalus from Para, Brazil, is distinguished from other species in the genus in possessing three spiny collars in the cervical region of the female. ac]19820512

Carnoya kermarreci n.sp. (Rhigonematidae: Nematoda) from Anadenobolus politus (Porat) (Rhinocricidae: Diplopoda) from Guadeloupe

SummaryCarnoya kermarreci n.sp. (Rhigonematidae; Nematoda) is described from Anadenobolus politus (Porat) (Rhinocricidae; Diplopoda) from Guadeloupe. The new species most closely resembles C. martiniquensis Adamson, 1984 from A. politus in Martinique and C. venezuelensis Adamson, 1984 from Rhinocricus flavocinctus from Venezuela in that the lips in the male are broad and the arrangement of caudal papillae is almost identical in the three species. Males of C. kermarreci are easily distinguished by the absence of spines, by the form of the cuticular projections at the base of the buccal cavity and by the fact that the most anterior pair of caudal papillae are located very close together. Females are distinguished by the presence of three pairs of somatic papillae near the level of the vulva. The nematode fauna of A. politus includes species from two distinct orders and presumably reflects the fact that diplopods are among the most ancient hosts of nematodes.

Descriptions ofPharyngodon asterostoma n.sp. andP. tiliquae Baylis, 1930 (Nematoda: Oxyuroidea) fromEgernia cunninghami (Scincidae) in Australia

SummaryTwo species ofPharyngodon (Oxyuroidea; Pharyngodonidae),P. asterostoma n.sp. andP. tiliquae Baylis, 1930 are described from a specimen ofEgernia cunninghami (Family Scincidae) from Fleurieu Peninsula, Blowhole Creek, New South Wales, Australia.P. asterostoma is easily distinguished from all other members of the genus by the form of the caudal bursa of the male and the oral opening of the male which is in the form of a six-pointed star.P. tiliquae is most similar toP. hindlei Thapar, 1925 fromTiliqua scincoides in Australia but is distinguished by the length of the tail in the male. Comparison of the structure of the caudal bursa in species from different regions of the world suggests that the most primitive species occur in Australia and the most evolved in the New World. ac]19821005

A revision of the genusCarnoya Gilson, 1898 (Nematoda: Rhigonematidae) with descriptions of four new species

SummaryThe type specimen ofCarnoya dubia Dollfus, 1952 is redescribed and four new species ofCarnoya are described.C. paradubia n. sp. fromRhinocricus nattereri varians from São Sebastião island, Brazil, most similar toC. dubia, is distinguished from the latter by having twice as many rows of cervical spines, by the absence of interlabial formations and by the position of the phasmids in the male.C. dollfusi n.sp. from the same host and locality asC. paradubia and most similar toC. pyramboia Artigas, 1926 is distinguished by the disposition of caudal papillae in the male and the form of the cervical spines in the female.C. martiniquensis n.sp. fromAnadenobolus politus from Martinique andC. venezuelensis n.sp. fromRhinocricus flavocinctus from Colony Tovar, Venezuela differ from all otherCarnoya spp. by having broad, well-developed lips and three cuticular projections at the base of the buccal cavity in the male. InC. martiniquensis the six inner papillae in the male are located on separate swellings, two on the inside edge of each lip whereas inC. venezuelensis there is only one swelling per lip and each bears a pair of inner papillae. Females of the two species differ in that the vulva is ventral inC. martiniquensis but subventral inC. venezuelensis. An emended diagnosis of the genus and a key to the known species is given. ac]19830221

Redescriptions of Rondonema rondoni Artigas, 1926 and R. pseudoannolenou Dollfus, 1952 with a revision of Rondonema Artigas, 1926

SummaryTwo species of Rondonema Artigas, 1926 are redescribed: R. rondoni Artigas, 1926 and R. pseudonannolenou Dollfus, 1952. Previously described as lacking spines, R. pseudonannolenou from Pseudonannolene tricolor from São Paulo, Brazil is shown to have three pairs of lateral cervical cuticular spines in the male and five or six pairs in females. Pararondonema Travassos in Kloss (1960) based on this species is considered a synonym of Rondonema. Sexual dimorphism of the buccal capsule is detailed: males have one dorsal and two subventral striated cuticular thickenings at the base of the buccal capsule, similar to those described in several other Rhigonematidae; similar thickenings were present in fourth-stage but not adult females. Rondonema rondoni from an unidentified diplopod from Remedios province, São Paulo, Brazil described on the basis of permanently mounted specimens differs from R. pseudonannolenou in having six cervical spines in both sexes and in the structure of the buccal capsule. The diagnosis of Rondonema is emended. The genus is considered to be entirely South American in distribution. Rondonema gubgibbosus Dollfus, 1964 from African diplopods is considered a species inquirenda. It is suggested that Angranema Travassos, 1929 could be a synonym of Rondonema. ac]19820504