The millipedes and centipedes of Chiapas amber Author Riquelme, Francisco Author Hernández-Patricio, Miguel text Check List 2018 2018-08-10 14 4 637 646 http://dx.doi.org/10.15560/14.4.637 journal article 10.15560/14.4.637 1809-127X Xystodesmidae sp. indet. Referred material. 2 specimens : CPAL .109: adult female, complete specimen ( Fig. 2D–F ); MALM .307: juvenile, complete specimen. Figure 3 . Millipedes from Simojovel, Chiapas, early-mid Miocene. A. Amber disc with 12 millipede specimens trapped inside, side A; scale bar = 10mm. B. Amber disc, side B; scale bar = 20 mm. Specimens from amber disc are as follows: MALM.301, MALM.302, MALM.303, MALM.304, MALM.305, MALM.306, MALM.307, MALM.308, MALM.309, MALM.310, MALM.311, and MALM.312. C. AM.CH.ID34, juliform millipede; scale bar = 5 mm. D. AM.CH.ID35, juliform millipede; scale bar = 5 mm. E. AM.CH.ID33, polydesmid millipede; scale bar = 5 mm. F. CPAL.108, polydesmid millipede; scale bar = 2 mm. Locality. Mexico , Chiapas : Simojovel: Guadalupe Victoria site, 17°07ʹ58ʺ N , 092°48ʹ19ʺ W . Identification. Body convex and tapering, head without eyes, antennae long and slender, collum smooth, trunk with about 17 rings in CPAL.109 and 20 in MALM.307, dorsally smooth, slightly mineralized in few zones by the fossilization process, paraterga subhorizontal, ozopores are fully visible on rings 5, 12, 13, and partially visible on rings 16, 17 and 18, as seen in a normal formula, epiproct conical with 2 short distal projections, and leg prefemura with short ventrodistal spine, which is clearly seen in the microscope, somewhat blurred in the micrograph due to the opacity of amber. Both specimens CPAL.109 and MALM.307 match Xystodesmidae , so this is the first fos- sil record of the family in Chiapas amber. Remarks. The extant members of the family Xystodesmidae are recorded in 20 states from the north to the south of the country, including Coahuila , Chiapas , Guerrero , Guanajuato , Hidalgo , Jalisco , Mexico City , Michoacán , Morelos , Nuevo León , Oaxaca , Puebla , San Luis Potosí , Sinaloa , State of Mexico , Tabasco , Tamaulipas , Tlaxcala , Veracruz , and Yucatán ( Bueno-Villegas et al. 2004 , Cupul-Magaña et al. 2014 , Cortés-Ríos and Gárate-Rodríguez 2017 ).