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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Mulveyotus

Mulveyotus Anderson & Ebsary, 1982 (ref. ID; 7200 original paper)

Family Tylenchorhynchidae (ref. ID; 7200)

ref. ID; 7200

Diagnosis

Lip region low, flattened anteriorly, head skeleton weakly developed. Stylet short, robust, knobs rounded. Cuticle coarsely annulated, inner cuticle thickened at anterior most region of neck. Metacorpus narrowly fusiform with a weakly developed valvular apparatus, basal esophageal bulb pyriform. Esophagointestinal valve large, discoid. Vagina uniformly cylindrical, vulva closed. Lateral field with three incisures, areolated along entire body. Tail excessively long and conoid tapering to a mucronate tip, distal hyaline quarter of tail smooth, comprised of thickened cuticle. (ref. ID; 7200)

Differential diagnosis

Mulveyotus n. gen. can be distinguished from closely related Triversus Sher, 1973 by its short stylet, fusiform metacorpus with a weakly cuticularized valvular apparatus, areolated lateral field, and long, conoid tail with a large smooth terminus of thickend cuticle. From Uliginotylenchus Siddiqi, 1971 it can be differentiated by the continuous, anteriorly flattened head with a weakly developed head skeleton, the short stylet, coarse body annules, and the dimensions and characteristics of the tail and tail terminus, which is subcylindrical of clavate with a broadly rounded terminus in species of Uliginotylenchus. The species of Tylenchorhynchus Cobb, 1913 with three incisures differ diagnostically from the monotypic species of Mulveyotus in having rounded, offset heads, a well developed, oval metacorpus, absence of areolated in the lateral field, and subcylindrical, broadly rounded tails without excessively thickened terminal cuticle. (ref. ID; 7200)

Etymology

The new genus is named in honor of R.H. Mulvey for his valuable contributions toward advancing the knowledge and taxonomy of nematodes in Canada. (ref. ID; 7200)

Type species

Mulveyotus hyalacus (ref. ID; 7200)
  1. Mulveyotus hyalacus Anderson & Ebsary, 1982 (ref. ID; 7200 original paper)

Mulveyotus hyalacus Anderson & Ebsary, 1982 (ref. ID; 7200 original paper)

Descriptions

  • Holotype (female): L=1029 µm, a=45, b=7.9, c=9.1, c'=6.4, V=50. Stylet length 11 µm, M=26. Body linear, annules coarse, 1.9-2.4 µm wide. Head truncated, continuous with body, bearing four distinct annules. Head skeleton, except for central tube, obscure. Stylet conus short, stylet knobs rounded. Dorsal esophageal gland orifice about 3 µm below stylet. Metacorpus narrow fusiform, valvular apparatus weakly cuticularized. Basal esophageal bulb pyriform. Esophagointestinal valve discoid, lobed, about width of basal bulb. Excretory pore 124 µm posterior to head end, deirid at same level. Ovaries outstretched, each 28% of body length, germ cells in single and double rows, one spermatheca spherical, one oval, filled with sperms. Columella of over 20 cells, vagina uniformly thin walled, vulva closed. Tail length, elongate-conoid, ending in a mucro. Ventral surface of tail marked by 43 coarse annules, terminal 24% of tail smooth, of thickened cuticle. Phasmids 47 µm posterior to level of anus, at 43% of tail length. (ref. ID; 7200)
  • Paratype (one female): L=1059 µm, a=41, b=8.0, c=8.9, c'=6.8, V=51. Stylet length 10.5 µm, M=27. Like holotype with the following supplemental data. Excretory pore 110 µm posterior to head end, located near base of isthmus, deirids 11 µm posterior, at midbasal bulb level. Ovaries 31 and 29% of body length, spermathecae spherical, with sperms. Ventral surface of tail marked by 54 annules, terminal 24% of tail of smoothly thickened cuticle. Phasmids 46 µm posterior to level of anus, at 39% of tail length. (ref. ID; 7200)
  • Male: Unknown. (ref. ID; 7200)

    Type host and locality

    Collected from a clay soil with a moss cover, Skeleton Lake, Northwest Territories, Canada. (ref. ID; 7200)

    Type designations

    Holotype (female), type slide No.256. Paratype (one female), same data as for holotype. Deposited in the Canadian National Collection of Nematodes, Ottawa. (ref. ID; 7200)