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Show THE CHILOPODA OF THE PHILIPPINE ISLANDS V. Class Chilopoda The - Centipedes 1802 Syngnatha Latreille: Hist. de Myriapoda. 1814 Syngnatha Leach: Trans. Linn. Soc. London, 21. 1817 Chilopoda Latreille: Les Myriopedes, in Cuvier le Regne Animal 1lI. Elongate and flattened arthropods with one pair of legs on a segment, Scutigerida forming apparent exception; number of leg-bearing segments varies from 15 (Lithobiida, Scutigerida) to 191 (Gonibregmatidae); antennae long and at least 14-jointed; 2 pairs of maxillae present, the first pair not being united, the second being prominent palp-like structures, called palpog naths, the basal parts of which are joined in the median line; a paired upper lip in front of the mandibles; legs usually long, those of each pair being widely separated from each other on the ventral surface; the first pair modified to form a pair of hook-like jaws called the maxilli peds or toxicognaths, which project forward beneath the head and are prehensile organs, each being provided with a poison gland; the broad bases, coxae, of the maxillipeds are joined in the middle line to form a lower lip; tracheae similar to those of insects, branched or not branched, anastomosing or not anastomosing; respiration through stomata, the latter paired and situated on the pleurae or unpaired and located along the dorsal line of the tergites on certain of segments. Genital ducts usually opening on the penultimate body segment; the young animals possessing' all their legs at birth in Geophilida and Scolopendrida and 7 pairs in an Lithobiida and Scutigertda. They are active animals feeding on living animals and ki lling their prey with the poison of the toxicognaths; certain of the tropical Scolopendrida can inflict a wound which is dangerous to children. Widespread. Nine families, 17 genera, and 44 species found in the Philippine Islands. Key to Subclasses and Orders 1a. Spiracles paired, placed on the pleurae between the tergites and the coxae; eyes compound; ocelli single or in groups or eyes absent; tracheae branched, anastomosing or not anastomosing; leg-bearing somite from 15 to numerous not • lb. ..•.•............• 1 Subclass Pleurostomata. in on . . • . . . . the mid-dorsal line . . • . • . • . . .....••.•.....•.•. 2 Subclass Notostomata . . . . . . . . . near . . 2 . the . . . . . . ..••. ..................•..• Scutigerida leg-bearing segments alternately long and short, except at middle of the body; those corresponding to legs 2, 4, 6, 9, 11 and 13 (not count ing the toxicognaths as legs) much smaller than the others; tracheae not anas tomosing; nineteen. body segments with fifteen pairs of legs; newly hatched animals with seven pairs of legs. 1 Superorder Anamorpha · . . . . • Tergites . • . . . • . . . . . . . . . . . . . . . . . • . • . . . . 4 Order of the • 2b. . Spiracles unpaired, number, placed posterior border of the tergites; eyes compound, with faceted surfaces; tracheae not branched and not anastomosing; leg-bearing somites 15 in number of sternites while tergites are fused to only eight in appearance seven • 2a. . • . · ...•.....•.•....•..... . . . . Tergites . . . . of the . . • . • . . . . • . . . . • . . . . . . . . . . . • . . ..... . . . . . . . . . . . . . . . . 3 Order Lithobiida leg-bearing segments not noticeably different 39 in size; the tracheae . . |
