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Distribution of the Milliped Tylobolus Utahensis Chamberlin, with Remarks on T

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Distribution of the Milliped Tylobolus Utahensis Chamberlin, with Remarks on T Great Basin Naturalist Volume 57 Number 3 Article 5 7-31-1997 Distribution of the milliped Tylobolus utahensis Chamberlin, with remarks on T. fredericksoni (Causey) (Spirobolida: Spirobolidae) Rowland M. Shelley North Carolina State Museum of Natural Sciences, Raleigh, North Carolina Selena B. Bauer North Carolina State Museum of Natural Sciences, Raleigh, North Carolina Follow this and additional works at: https://scholarsarchive.byu.edu/gbn Recommended Citation Shelley, Rowland M. and Bauer, Selena B. (1997) "Distribution of the milliped Tylobolus utahensis Chamberlin, with remarks on T. fredericksoni (Causey) (Spirobolida: Spirobolidae)," Great Basin Naturalist: Vol. 57 : No. 3 , Article 5. Available at: https://scholarsarchive.byu.edu/gbn/vol57/iss3/5 This Article is brought to you for free and open access by the Western North American Naturalist Publications at BYU ScholarsArchive. It has been accepted for inclusion in Great Basin Naturalist by an authorized editor of BYU ScholarsArchive. For more information, please contact [email protected], [email protected]. Great Basin Naturalist 57(3), © 1997, pp. 231-237 DISTRIBUTION OF THE MILLIPED TYLOBOLUS UTAHENSIS CHAMBERLIN, WITH REMARKS ON T. FREDERICKSONI (CAUSEY) (SPIROBOLIDA: SPIROBOLIDAE) Rowland M. Shelleyl fmd Selena B. Bauerl ABSTRACT.-Tyloholus utahensis Chamberlin, the only representative of the genus occurring in the southwestern deserts, ranges from central Inya County, California, to the western periphelY of Kane County, Utah. This distribution roughly corresponds to the northern limit ofthe Mojave Desert ecosystem and is also shown by the milliped Piedolus utus Chamberlin (Spirobolida: Atopetholidae) and the centipede Theatops posticus (Say) (Scolopendl'Omorpha: Clyptopidae). Tyloholus frederi{;ksoni Causey, ostensibly from Douglas County, Kansas, is designated a "nomen duhium." and disregarded pending collection of fresh material; Na:rceus gordanus (Chamberlin) is deleted from South Carolina and Tennessee. T.lJloboms tmeigern~ (Wood) occurs north of the Columbia River in Klickitat County, Washington, and Hiltonius thehanus Chamberlin is referrable to Onychelus Cook in the family Atopetholidae. Key words: Tylobolus; T utahensis; T. fredericksoni; Narcous americanus; Washington County, Utah; Inyo County, California; Hiltonius. The subfamily Tylobolinae of the diplopod questionable reports of an additional species, family Spirobolidae comprises 2 geuera, Tylo­ T. fmdericksoni (Causey), in Douglas County, bolus Cook aud Hiltonius Chamberlin. Keeton Kansas, on the eastern periphery of the Cen­ (1960) revised both taxa, recognizing 3 species tral Plains. We report 37 additional samples of of Hiltonius in southwestern California and T. utahensis that expaud its range some 300 mi adjacent Baja California Norte, and 2 species (480 km) westward to central Inyo County, in mainland Mexico that range northward into California, east ofthe Sierras, and provide data Santa Cruz County, Arizona (Keeton 1960, on segment uumbers, lengths, aud widths. We Shelley 1995, plus unreported samples exam­ also designate T. fredericksoni as a "nomen ined by the 1st author). The 6th species, H. the­ dubium" because there is no recent, indis­ banus Chamberlin, occurring at Tbeba, Mari­ putable evidence that a representative of this copa County, Ariwna, is referrable to OnycluJlus genus occurs east of the area occupied by T. Cook in the family Atopetholidae, as the 1st utahensi,. The distribution of the Tylobolinae author has learned from examining the female in the United States and the adjacent periph­ holotype at NMNH (see acronyms below). In ery of Mexico is shown in Figure L Acronyms a supplemental paper on the California repre­ of sources of preserved study material are as sentatives of Tylobolus, Keeton (1966) cited 6 follows: species west of the crest of the Sierra Nevada, BYU-Montc L. Bean Life Science Museum, 1 of which, T. uncigerus (Wood), ranged north­ Brigham Young University, Provo, UT ward to the Columbia River at Portlaud, Ore­ CAS-California Academy of Sciences, San gon; we extend its distribution into the adja­ Francisco cent periphery of Washington based on a male CDFA-California Department of Food and and female from Klickitat, Klickitat County, at Agriculture, Sacramento FSCA. Tylobolus extends southward into the DC--Life Scieuces Division, Dixie College, adjacent fringe of Baja California Norte (Boll­ St. George, UT man 1888, Keeton 1960, Loomis 1968) and, like FSCA-Florida State Collection of Arthro­ Hiltonius, occupies the western interior, as T. pods, Gainesville utahensis Chamberlin inhabits Zion National LACMNH-Los Angeles County Museum Park, Washington County, Utah. There are also of Natural History, Los Angeles, CA 1North ('~1rolinu State Museum ofNatural Scien""s, Bux 2.9555, n"leigh, NC 27626·0555. 231 232 GREAT BASIN NATURALIST [Volume 57 1924 at an unknown location in Zion National Park, Washington County, Utah. DIAGNOSIs.-Metazonal striae terminating ventrolaterad, well below level of ozopores; anterior gonopod telopodite apically blunt and rounded, not uncinate; posterior ganopod tibiotarsus forming right angle with distal pro­ jection (Figs. 2-4). VARIATION.-New material agrees closely with the holotype. The posterior gonopod tibiotarsus is slightly broader and blunter, and the denticles, which Causey (1955) and Keeton (1960) termed "prickles," cover larger areas on both the anterior and posterior gonopods. In juveniles the distal projection of the posterior gonopod is less angular, extending submediad L rather than downward or dorsad. We reexam­ A 1 ined the holotype and found the denticles to be stronger than shown by Keeton (1960, figs. , ,J 262-264); there is also a pronounced line or , ridge of these along the ventral surface of the I posterior gonopod telopodite that he did not show (Fig. 5). In his supplemental work on California species, Keeton (1966) tabulated meristic and Fig. L Distribution of the Tylobolinae in the United morphometric data; we present such data for States and adjacent periphery of Mexico. Solid lines (A), T utahensis (Table 1) to provide parallel accounts 'f'lloholus; dashed lines (B), Hiltonius. for all species of rylobolu.s. On the average, females are slightly longer and broader than males; adults are equivalent in length through­ MCZ-Museum of Comparative Zoology, Harvard University, Cambridge, MA out the range, but those on the east are nar­ NCSM-North Carolina State Museum of rower. The adult segment number varies from Natural Sciences, Raleigh 51 to 57, as all individuals with > 52 segments NMNH-National Museum of Natural have no legless segments except the epiproct. History, Smithsonian Institution, Wash­ Three females and 2 males have 51 segments, ington, DC none legless, while 3 males and 1 female with SEM-Snow Entomological Museum, Uni­ this count have 1 or 3 legless segments; all versity ofKansas, Lawrence individuals with < 50 segments have at least 1 UCD-Bohart Entomological Museum, without appendages. University ofCalifornia at Davis DISTRIBUTION.-Occurring from the Inyo UGA-University of Georgia Museum of Mountains on the eastern side of Owens Val­ Natural History, Athens. ley, Inyo County, California, to the eastern edge of Zion National Park in western Kane 'rqlobolu.s utahensis Chamberlin County, Utah, a distance of approximately 300 (Fig,. 2-5) mi (480 km; Figs. 1, 6). The milliped should rylobolu.s utahensis Chamberlin, 1925:60-61. also be expected along the Virgin River in the Keeton, 1960:131-132, figs. 262-264. northwestern corner of Mohave County, Ari­ Califomibolu.s utahensis: Chamberlin, 1949: zona; along this river and in other parts of 166. Chamberlin and Hoffman, 1958:162. northern Clark County, Nevada; and through­ out most of Lincoln County, Nevada, particu­ TYPE SPECIMENs.-Male holotype, female larly in canyons and gorges east of Caliente, allotype, and 2 male and 1 female paratypes Panacea, and Pioche. Specimens in Inyo (MCZ) collected by R.V Chamberlin in May County were taken in pitfall traps at elevations 1997J DISTRIBUTION OF TYLOBOWS UTAHENS!S 233 .­ ~-~--.-­...... ~--­----.--.... 5 2 0'··.'., ,.;":'-:-" '. ........•...., ~~~.,:.'',' " 3 Figs. 2-5. Tylobolu.s utalwnsis: 2, anterior gonopods of a male from Saline Valier, Inyo County, California, anterior view; 3. left posterior gonopod of the same, anterior view; 4, the same, caudal view; 5, right posterior gonopod ofholo­ type. anterior view. Scale line =: 1.00 nun for aJlfigures. of2296-6560 ft. In addition to the types, spec­ 40 km) S Saline Valley, 2M, 29 April 1975, imens were examined as follows: A.R Hardy (CDFA), and Death Valley at Pk, CALlFORNlA, Inyo Co., Inyo Mts, Lead Can­ Panamint Mts, Johnson Cyn, F, 2 June 1961, yon (Cyn), F, 9 March-13 August 1981, D. R Waner ( MNH). Giuliani (CAS), Inyo Mts, Hunter Cyn, M, F, NEVADA: Nye Go., Nuclear Test Site, Ranier 9 June 1980-26 May 1981, D. Giuliani (CAS); Mesa, 2M, juv, date unknown, D.B. Thomas Inyo Mts, Willow Cr, F, 16 September 1976, (LACMNH, NCSM). collector unknown (LACMNH); Saline Valley, UTAH: Washington Co., 12 mi (19.2 km) NW 11 different stations but exact locations un­ St. George, nr Baker Darn, 3M, 2F, 16 April known, lOM, 17F, juv, 5 April 1959-14 June 1971, B. K. Carrell (DC), Pine Valley, F, 26 May 1960, B. Banta (CAS); Saline Valley, 10 stations 1971, Prothero (DC); Snow Cyn St Pk, M, 16 along Grapevine Cyn Rd but exact locations April 1982, RW Baumann (BYU); Pintura, F, 8 unknown, 16M, 6F, 15 August 1959-7 May March 1941, J. & W. Ivie (NMNH), Motaqua, 1960, B. Banta (CAS); 21 and 25 mi (33.6 and M, 17 April 1933, M. Zuie (NMNH), Oak Grove 234 GREAT BASIN ATUMUST [Volume 57 TAIJLE ]. Meristic lmd mOT})hOlOehic dara on Tylnbolus utahensis. Individuals are listed in d~ndjng order according to segment counts, which include the epiproct; the number orIegless segments in addition to the epiproct, if any, is shown in parentheses. Measurements l:I.fC in mm. Averages are for specimens \vith no additional legless segments. Males -Females Segments Length Max. width Segment!!" Length Max. width CA, Hunter Canyon 5[([) 41.7 4.0 49([) 35.8 3.9 CA, Lead Canyon 50(2) 27.4 3.[ CA, \'Villo\\' Creek 51(3) 36.1 3.4 CA.
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  • On Mexican Millipeds
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