Published December 31, 1971 | Version v1
Taxonomic treatment Open

Criconemoides hemisphaericaudatus Wu 1965

Creators

  • 1. Department of Hematology, Agricultural University, Wageningen, The Netherlands

Description

Criconemoides hemisphaericaudatus Wu, 1965

(Fig. 13, A -B).

One female. Dimensions: L = 0.51 mm; a = 13; b = 3.4; c = 28; V = 5493. Spear length = 84 pi. Rex = 36; RV = 10; Ran = 6; R = 116. Tail very bluntly rounded, posterior end of body tapering hardly, almost cylindroid. The annules 98 -115 show lateral indentations. There are occasional anastomoses, one to three together. Head end rounded, submedian lobes very small. The posterior margin of the annules is very finely crenate. Vulva apparently slightly open; the vagina runs almost transversely in its distal part. The posterior edge of the prevulvar annule is modified slightly, suggesting a small ornamentation on the anterior vulva lip in agreement with Wu's fig. 14.

Two very small juveniles (L -2 or L -3), one damaged. L = 0.23 mm; spear = 37 -40 ji.; gonad primordium = l i p.; Rex = 42, R = 127 (n = 1). Annules crenate with rather many anastomoses.

This species is very close to C.morgensis (Hofmänner & Menzel, 1914) with which it was considered identical by de Grisse, 1968. However, I prefer to keep it apart because of the shape of the posterior body end (in morgensis tapering, truncate) and the appearance of the vulva: in morgensis it is distinctly closed in lateral view, situated on the middle of the annule; in hemisphaericaudatus it appears slightly open in lateral view (ventral view shows it to be closed really) and lies between two annules. In morgensis the vagina runs obliquely to the vulva, in hemisphaericaudatus almost transversely. Finally the crenation of the posterior margins of the annules appears more coarse in morgensis than in hemisphaericaudatus.

Whether C. annulatus Taylor, 1936 is identical with morgensis or with hemisphaericaudatus cannot be decided for the moment: vagina direction suggests the former, tail shape the latter (Cf. Raski & Golden, 1966, fig. 4 D- E).

Female in sample 26; juveniles in 26 and 62.

Notes

Published as part of P. A. A. LOOF, 1971, FREELIVING AND PLANT PARASITIC NEMATODES FROM SPITZBERGEN, COLLECTED BY MR. H. VAN ROSSEN, pp. 1-86 in Mededelingen Landbouwhogeschool Wageningen 71 on page 45, DOI: 10.5281/zenodo.8152982

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Linked records

Additional details

Biodiversity

Family
Criconematidae
Genus
Criconemoides
Kingdom
Animalia
Order
Rhabditida
Phylum
Nematoda
Scientific name authorship
Wu
Species
hemisphaericaudatus
Taxon rank
species
Taxonomic concept label
Criconemoides hemisphaericaudatus Wu, 1965 sec. A., 1971