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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Pedalia

Pedalia Barrois, 1878

See Hexarthra

Synonym Pedalion Hudson, 1871 (ref. ID; 2978, 3050)
  1. Pedalia bulgarica Wiszniewski, 1933 (ref. ID; 1345)
  2. Pedalia fennica (Levander, 1892) (ref. ID; 1345, 2393, 3060, 3181)
    Syn; Hexarthra fennica (Levander) Neal, 1951 (ref. ID; 1345); Pedalia fennica (Levander) Harring, 1913 (ref. ID; 1345); Pedalion fennicum Levander, 1892 (ref. ID; 1345, 3060); Pedalium fennicum Levander, 1892 (ref. ID; 3181)
  3. Pedalia fennica var. oxyuris (Sernov, 1903) (ref. ID; 1345, 3050)
    Syn; Hexarthra oxyuris (Sernov) Neal, 1951 (ref. ID; 1345); Pedalia oxyure (Sernov) Harring, 1913 (ref. ID; 1345); Pedalion mucronatum Daday, 1909 (ref. ID; 1345); Pedalion oxyure Sernov, 1903 (ref. ID; 1345)
  4. Pedalia fennica var. polyodonta Hauer, 1957 (ref. ID; 2934 original paper)
  5. Pedalia intermedia Wiszniewski, 1929 (ref. ID; 1345)
  6. Pedalia intermedia f. brasiliensis Hauer, 1953 (ref. ID; 2899)
  7. Pedalia libica Manfredi, 1939 (ref. ID; 1345)
  8. Pedalia jenkinae de Beauchamp, 1932 (ref. ID; 1345)
  9. Pedalia mira (Hudson, 1871) (ref. ID; 1345, 3060, 3271) reported year? (ref. ID; 3066) reported author and year? (ref. ID; 3292)
    Syn; Hexarthra mira Hudson (ref. ID; 1132); Pedalia mira Barrois, 1878 (ref. ID; 1345, 3271); Pedalia mira Harring, 1913 (ref. ID; 1345); Pedalion mira Hudson, 1871 (ref. ID; 1345, 3271); Pedalion mirum Hudson & Gosse, 1886 (ref. ID; 1345, 3271) Hudson, 1871 (ref. ID; 3060)
  10. Pedalia mollis Bartos, 1948 (ref. ID; 1345)
  11. Pedalia propinqua Bartos, 1948 (ref. ID; 1345)
  12. Pedalia reducens Bartos, 1948 (ref. ID; 1345)

Pedalia fennica (Levander, 1892) (ref. ID; 1345, 2393, 3060, 3181)

Synonym

Hexarthra fennica (Levander) Neal, 1951 (ref. ID; 1345); Pedalia fennica (Levander) Harring, 1913 (ref. ID; 1345); Pedalion fennicum Levander, 1892 (ref. ID; 1345, 3060); Pedalium fennicum Levander, 1892 (ref. ID; 3181)

Comments

Professor Percival suggested that there were to species of Pedalia in the Southern lakes, and examination confirmed this view. In the case of P. mira the number of bristles on the appendages was found in some cases to be less than stated in the original description; also specimens were found with the bristles on the ventral appendage paired instead of separate. Rudimentary bristles were also seen together with specimens having the bristles broken off at the appendage. It is considered that little reliance can be placed on the number and type of the appendage bristles in comparison with the more stable characteristics such as the trophi, and shape of the coronal lip. Only minor differences were noticed in P. fennica. A smaller number of bristles than stated in the original citation was found in the Lake Brunner specimens. Some specimens from the Southern lakes had a slightly flared coronal lip, but in no case was the deeply grooved lip of P. mira found. In general, the trophi of both species agreed with the original descriptions. Wiszniewski (1933) gives an excellent description of five species of Pedalia together with the variations he has found, and from a study of this paper in conjunction with the original citations it is considered that the specimen are merely geographical variations of P. mira and P. fennica. Finally, it should be noted that Pedalia is not the only genus of the Filiniidae in which there is a marked variability of the appendages. (ref. ID; 3181)

Pedalia fennica var. oxyuris (Sernov, 1903) (ref. ID; 1345, 3050)

Synonym

Hexarthra oxyuris (Sernov) Neal, 1951 (ref. ID; 1345); Pedalia oxyure (Sernov) Harring, 1913 (ref. ID; 1345); Pedalion mucronatum Daday, 1909 (ref. ID; 1345); Pedalion oxyure Sernov, 1903 (ref. ID; 1345)

Descriptions

The appendages are two dorsolateral, one on each side; two ventrolateral, one on each side; one mid-dorsal and midventral. The trochal discs bear a ring of cilia. The circumapical ring in this case is not continuous and is confined to the discs so that each disc has two rings of cilia, an upper and a lower on round it. Mastax is malleoramate. The fulcrum as such is absent but the two manubria have posterior handles which protrude beyond them, meet each other and form a fulcrum. Two rami are present each being divided into three parts on both sides. Each uncus bears seven club-shaped teeth. The arrangement of appendages conforms strictly to the species described as P. fennica by Voigt (1957). P. fennica (forma typica) has a body-length of 104-290 µm and there are 7 unci though the number may vary between 6-8 and also the number may be asymmetrical. (ref. ID; 3050)

Measurements

Maximum body length 110; maximum body breadth 98 um. (ref. ID; 3050)

Pedalia mira (Hudson, 1871) (ref. ID; 1345, 3060, 3271) reported year? (ref. ID; 3066) reported author and year? (ref. ID; 3292)

Synonym

Hexarthra mira Hudson (ref. ID; 1132); Pedalia mira Barrois, 1878 (ref. ID; 1345, 3271); Pedalia mira Harring, 1913 (ref. ID; 1345); Pedalion mira Hudson, 1871 (ref. ID; 1345, 3271); Pedalion mirum Hudson & Gosse, 1886 (ref. ID; 1345, 3271) Hudson, 1871 (ref. ID; 3060)

Descriptions

Male: Male present. (ref. ID; 3066)