The Taxonomic Value of the Microscopic Structure of the Stigmal Plates in the Tick Genus Dermacentor

The Taxonomic Value of the Microscopic Structure of the Stigmal Plates in the Tick Genus Dermacentor

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 edition. Excerpt: .../i in diameter. Capitulum: Postero-lateral projections of base short. External article with a proximal, very large recurved tooth, a subapical smaller tooth, and a very small apical tooth. Hypostome, each half with a number of small subterminal denticles, followed by three rows of strong denticles, followed proximally by smaller denticles. Palpi, lateral margin convex, article 1 provided with four to five strong bristles on ventro-median margin; article 3 rather triangular dorsally, bluntly rounded distally, with several bristles on the concave margin of dorsoterminal portion and one or two terminal bristles; dorso-retrograde prolongation of article 2 (so prominent in D. reticulatus) nil, but one may be indicated on the postero-median angle. Legs: Lateral (outer) spur of coxa? I longer than the median (inner) spur; trochanter I provided with retrograde curved blade; terminal recurved spur not very well developed on tarsi I. Male.--Length, 4 mm. (exclusive of hind legs; with legs outstretched, about 5 mm.); greatest breadth, 2.5 mm. Body oval, sides may be somewhat straighter than those of D. salmoni, more like those of D. variegatus; unmounted specimens 0.88 mm. broad at scapulae (shoulders), specimens mounted under pressure measure up to 1.12 mm. at tills point; the sides diverge from here till they reach their maximum divergence at coxa? IV, -where the breadth may vary from 2.25 to 2.5 mm. in unmounted specimens to 2.9 or even 3.25 mm. in specimens mounted under pressure. Dorsum: Scutum covers entire dorsum (except capitulum); scapula? project 0.27 to 0.30 mm. from border of excavation; cervical and marginal grooves distinct, cervical groove deeper anteriorly than posteriorly; scutum deep reddish brown, nearly covered with rust;..show more

Product details

  • Paperback | 32 pages
  • 189 x 246 x 2mm | 77g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236843436
  • 9781236843432