. The Canadian field-naturalist. 294 The Canadian Field-Naturalist Vol. 104. Figure I. Isohypsibius woodsae. A, Entire animal, dorsal view; B, Reticulated pattern of cuticle, covering entire dorsal surface; C, Buccopharyngeal apparatus; D, Claws of leg III; E, Claws of leg IV. Scale bars in ^tm as follows: A, 20; B, ; C, 6; D, ; E, 6. Discussion. Approximately half of the nearly 100 species in the genus Isohypsibius have gibbosities and a sculptured cuticular pattern. However, only five species have a similar number of rows of gibbosities as Isohypsibius woodsae with an even number of gi
. The Canadian field-naturalist. 294 The Canadian Field-Naturalist Vol. 104. Figure I. Isohypsibius woodsae. A, Entire animal, dorsal view; B, Reticulated pattern of cuticle, covering entire dorsal surface; C, Buccopharyngeal apparatus; D, Claws of leg III; E, Claws of leg IV. Scale bars in ^tm as follows: A, 20; B, ; C, 6; D, ; E, 6. Discussion. Approximately half of the nearly 100 species in the genus Isohypsibius have gibbosities and a sculptured cuticular pattern. However, only five species have a similar number of rows of gibbosities as Isohypsibius woodsae with an even number of gibbosities in each of these rows and a reticulated (versus granulated or smooth) cuticle. IsohypsibiusJosephi (Iharo^, 1964) has a maximum size of 300 /um, nine rows of gibbosities, a short wide buccopharyngeal tube, and a long sinuous scleroti/.ed bar in all four pairs of legs. Isohypsibius neoundulalus (Durante Pasa and Maucci, 1975) is small « 220/um), has 18-24 transverse rows but with gibbosities in only the dorsolateral positions on six rows, has doublcclaws of equal si/e, and no sclerotized bars on the claws. Isohypsibius pratensis (Iharos, 1964) has nine rows of gibbosities with two in rows 1 and 6, four in rows 2, 4, 5, 8 and 9, and six in rows 3 and 7; the cuticle is finely granulated as well as reticulated; and, presumably, there are no bars on the claws although this is not specifically mentioned. Isohypsibius rudescui (Iharos, 1966) is < 225 iim. long, has 10 rows of gibbosities with two in rows 1, 2, 4 and 10, and four in rows 3, 5, 6, 7, 8 and 9, with some gibbosities noticably larger than others, and presumably has no bars on the claws. Isohypsibius woodsae exhibits several characters which distinguish it from the only other species which has 10 rows of four gibbosities in each row except the tenth which has two. Isohypsibius bartosi (Iharos, 1966) is a smaller animal (240-270 (xm) than /. woodsae (310 and 292 ixm), eyespots are absent and the cuticle is fine
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Keywords: ., bookcentury1900, bookdecade1910, buccal, claw, stylus, tardigrade
