Remarks on the type species of Rhigonema Cobb, 1898 (Rhigonematoidea: Rhigonematidae) and Heth Cobb, 1898 (Ransomnematoidea: Hethidae)

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Additional information on Rhigonema brevicollum, the type of the genus Rhigonema, and on Heth juli, the type of the genus Heth, is presented based on original, hitherto unpublished, descriptions held in the Cobb Archive at the USDA, Beltsville, MD, USA. Both species were originally published as small annotated illustrations in a general work, although the promised full descriptions were never published by Cobb. The genus Rhigonema is shown to be based on a species lacking a vaginal diverticulum in the female genital system, but having a long, Type 2, ovejector. The genus Dudekemia, originally differentiated from Rhigonema on an assumed (and erroneous) difference in female genital tract form, is confirmed as a junior synonym of Rhigonema. A full description of both sexes of Heth juli is also provided, again based on Cobb’s original notes, thereby defining the type species with greater precision than was previously possible.

Remarks on the type species of Rhigonema Cobb, 1898 (Rhigonematoidea: Rhigonematidae) and Heth Cobb, 1898 (Ransomnematoidea: Hethidae)

in Nematology

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References

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AdamsonM.L. (1987). Rhigonematid (Rhigonematida; Nematoda) parasites of Scaphiostreptus seychellarum (Spirostreptida; Diplopoda) in the Seychelles with comments on the ovejector structure in Rhigonema Cobb, 1898. Canadian Journal of Zoology 651889-1897.

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Figures

  • View in gallery

    A: Part of Plate VII from Leidy (1853) showing Ascaris (= Rhigonema) infecta female genital system with vaginal diverticulum (reproduced from: Smithsonian Contribution to Knowledge, 5); B: Fig. 29 from Cobb (1898) showing published figure of “Rhigonema brevicollis, gen. nov., n. sp.”. Original abbreviations: I = side view of male; II = head of male; III = side view of middle portion of female; IV = side view of male tail; a = lips; b = oesophagus; c = nerve ring; d = excretory pore; e = cardiac bulb; f = intestine; g = testicle; i = eggs in uterus; j = vulva; k = juncture of testicle and vas deferens; l = commencement of ejaculatory duct; m = proximal end of spiculum; n = anterior submedian papillae; o = oblique copulatory muscles; p = pre-anal papillae; q = anal papillae; r = anus; s = tips of spicula; t = oblique muscles; u = spicula; v = post. anal papillae; w = post. anal papillae; x = terminus. Note: the original figure was printed at a size of 75 mm from top to bottom. Reproduced from: Extract from MS report on the parasites of stock. Agricultural Gazette of New South Wales 9, 16.

  • View in gallery

    A: Unpublished drawings of Heth juli Cobb, 1898, courtesy of the Cobb Archive, USDA, Beltsville, MD. Note the differences in the depiction of the spiny collar and lappets between this figure of the female neck region and that published in 1898 (B); B: Fig. 10 from Cobb (1898) showing published figure of “Heth juli, gen. nov., n. sp.”. Original abbreviations: I = side view of female; II = head of female; III = front view of female; IV = ventral view of II; a = mouth; b = strainers; c = cephalic constriction; d = nerve ring; e = gland; f = oesophageal constriction; g = cardiac bulb; h = flexures in ovaries; i = ovary; j = strainer; k = pharynx; l = strainer; m = segmenting eggs; n = papillae; o = one of the two dorso-ventral markings; p = vulva; q = anus; r = one of the dorso-ventral fins; s = one of the dorso-ventral fins; t = one of the dorso-ventral fins; u = terminus. Cobb seems to have confused the orientation of his specimen, the longitudinal rows of ‘fins’ being lateral, not dorso-ventral as indicated for IV, whereas the ‘dorso-ventral markings’ in III are in fact the laterally located amphidial apertures. Note: the original figure was printed at a size of 75 mm from top to bottom. Reproduced from: Extract from MS report on the parasites of stock. Agricultural Gazette of New South Wales 9, 4.

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