. The Cambridge natural history. Zoology. 472 ARACHNIDA ACARINA The remaining families of the Prostigmata (Halacaridae, Hydrachnidae, and Trombidiidae) all have raptorial palps, and clawed or piercing chelicerae. Fam. 2. Halacaridae. —- This is a small group of marine Mites. In their usually prominent capitulum they resemble the Bdellidae. In some respects they recall the Oribatidae, having hard integuments, and their legs being articulated near the margin of the body. Tlrey do not swim, but crawl upon weeds and zoophytes, or burrow in the mud. Fam. 3. Hydrachnidae.—The Hydrachnidae are the Fr
. The Cambridge natural history. Zoology. 472 ARACHNIDA ACARINA The remaining families of the Prostigmata (Halacaridae, Hydrachnidae, and Trombidiidae) all have raptorial palps, and clawed or piercing chelicerae. Fam. 2. Halacaridae. —- This is a small group of marine Mites. In their usually prominent capitulum they resemble the Bdellidae. In some respects they recall the Oribatidae, having hard integuments, and their legs being articulated near the margin of the body. Tlrey do not swim, but crawl upon weeds and zoophytes, or burrow in the mud. Fam. 3. Hydrachnidae.—The Hydrachnidae are the Fresh- water Mites. Their legs are provided with long close-set hairs, and thus adapted for swimming. Tliey are predaceous, and in their young stages are often parasitic on water insects. A familiar example is Atax bonzi, which lives within the shell of the fresh-water mussel. Fam. 4. Trombidiidae. — The predaceous palps of the Trombi- diidae are generally of the " finger- and-thumb" type. The tarsi are two-clawed, without caruncle. This group may be divided into six sub- families. (i.) The LiMNOCHAEiNAE or " Mud-mites" connect the Hydrach- nidae with the typical Trombidiidae. They are usually velvety and of a red colour. They do not swim, but creep. The larva of Limnocharis aquaticus is parasitic on Gcrris lacustris. (ii.) The Caeculinab bear a strong general resemblance to the Harvestmen or Phalangidae. Caeculus is so similar to the Phalangid genus Trogulus that. Fig. 247.—Atax alticola, x 16. (After Cauestrini.) by Dufour to belong. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harmer, S. F. (Sidney Frederic), Sir, 1862- ed; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. ed. [London, Macmillan and Co. , Limited; New York, The Macmillan Company
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
