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Show THE DIPLOPODA OF THE PHILIPPINE ISLANDS IV. Class Diplopoda 'Tbe - Millipeds 1844 Diplopoda Blainville and 'Gervais, Aim. Sci. Nat , Ser. 2" Vol. Latzel, Myr. Ost, Ung. MOllar,., Vol. 2, p. 410. .. p. 51.. 3, 1'884 Diplopoda I Usually elongate and cylindrical arthropods, with 2 pairs of legs on most of the segments; with the exception .of the first few and the last segment, each has been formed by the fusion of 2 somites, thus possessing 4 legs, 2 ganglia, 2 pairs of spiracles, and 2 patrs of Qpemngs in the heart; antennae short, mostly 'I-jointed; but one pair of maxillae present, which are united to form an underlip called the gnathochilarmm; an upper lip present in front of the mouth; integument often hard, containing calcium carbonate; Iegs of each pair spring from the VDtral surface close together and near each leg is a spiracle; a row of the openings of stink glands usually present along the side of body, which secrete an offensive gas, which in certain eases is hydrocyanic acid; tracheae of primitive structure" each spiracle opening into a fascicle of usually unbranched tubes; gonads usually unpaired and in hinder part of the body, the paired ducts leading into two openings in the second body segment; one or both pairs of legs in the seventh segment usually modified in structure in the male, to serve as ,copulatory organs, the gonopods; the young larvae with but three patrsof legs and a few segments. They are usually sluggish animals living under stones and in other dark, moist places, They feed on decaying vegetable and animal matter, but also In some cases on living roots, in such cases often prov ing destructive in gardens, 15 families, 24 genera and '54 species are known to occur in the Philippine Islands", The following key to subclasses and orders is based on the Chamberlin system: Key to Subclasses and Orders of Diplopoda la. carbonate; with numerous, peculiar trtchobottma, branched, points, barbs, etc; hairs, bristles, scales, trichobothria present on the head; gonopods absent. Subclass Pselapllognatha... Body soft, without calcium with lateral lb. . . .. . • · . . . . . . . • . . .. . . . . . .. . . . · . . . . . . . . . . . . . . . . • . . . . . . . . • . . . . . .. . . . • . . . • . . . • . . . . . . . . . . . . . . . . • . . . • . . . . . . . . . • . . . • . . . . . . . . . . . . ..... Order Polyxenida. hairs when present, Simple, not . . . .. . . . ,. Body wall with calcium carbonate; trtehobothrta; gonopods on the seventh segment of male or telopods on posterior end Subclass Chilognatha .' 2 Male with 1 to 2 pairs of telopods on posterior end, the females without such modi fied legs; the tracheae are dichotomously branched; sternites divided; intestinal 1 Superorder Pentazonia canal with N-shaped double bend 3 On the seventh segment of the male, 1 to 2 pairs of gonopods; the tracheae go off in bunches from the tracheal pocket and are not dichotomously branched; sternites not divided except on some specially modified thoracic segments; intestine straight 4 Trunk consrsting of 22 segments with 36 pairs of legs, the male in addition with 1 pair of telopods; second segment not enlarged; body not contractile into a ball ..... .. · 2a. • . • . . . . . . . . . . • . . . . . • . .. 2b. - ...•.. . • ... 3a. 1 order Glomeridesmida Trunk consisting of 14 to 16 segments with 1 7 to 21 pairs of legs, the male with 2 pairs of telopods; second segment strongly enlarged; body · 3b. . . . . . . . tractile into . . a . . . ball. . . . . . . . . . • . . . . . in ·additi completely ..........••.. 2 order Glomerida ____ 5 •••••••• e . con .•••••••••• |
