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diff --git a/31040.txt b/31040.txt new file mode 100644 index 0000000..c9e05fb --- /dev/null +++ b/31040.txt @@ -0,0 +1,555 @@ +The Project Gutenberg EBook of The Pigmy Woodrat, Neotoma goldmani, Its +Distribution and Systematic Position, by Dennis G. Rainey and Rollin H. Baker + +This eBook is for the use of anyone anywhere at no cost and with +almost no restrictions whatsoever. You may copy it, give it away or +re-use it under the terms of the Project Gutenberg License included +with this eBook or online at www.gutenberg.org + + +Title: The Pigmy Woodrat, Neotoma goldmani, Its Distribution and Systematic Position + +Author: Dennis G. Rainey + Rollin H. Baker + +Release Date: January 22, 2010 [EBook #31040] + +Language: English + +Character set encoding: ASCII + +*** START OF THIS PROJECT GUTENBERG EBOOK PIGMY WOODRAT *** + + + + +Produced by Chris Curnow, Joseph Cooper and the Online +Distributed Proofreading Team at http://www.pgdp.net + + + + + + + + + + UNIVERSITY OF KANSAS PUBLICATIONS + MUSEUM OF NATURAL HISTORY + + Volume 7, No. 15, pp. 619-624, 2 figs. in text + June 10, 1955 + + + The Pigmy Woodrat, Neotoma goldmani, + Its Distribution and Systematic Position + + BY + DENNIS G. RAINEY AND ROLLIN H. BAKER + + + UNIVERSITY OF KANSAS + LAWRENCE + 1955 + + + + + UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY + + Editors: E. Raymond Hall, Chairman, A. Byron Leonard, + Robert W. Wilson + + + Vol. 7, No. 15, pp. 619-624 + Published June 10, 1955 + + + UNIVERSITY OF KANSAS + Lawrence, Kansas + + + PRINTED BY + FERD VOILAND. JR., STATE PRINTER + TOPEKA, KANSAS + 1955 + + 25-7820 + + + + + The Pigmy Woodrat, Neotoma goldmani, + Its Distribution and Systematic Position + + By + + Dennis G. Rainey and Rollin H. Baker + + +The pigmy woodrat, _Neotoma goldmani_ Merriam, the smallest known +member of the genus, inhabits rocky areas in the elevated desert +regions of the northern part of the Mexican Plateau (Mesa del Norte). +Goldman (N. Amer. Fauna, 31:82, October 10, 1910) had for study ten +specimens from two localities in Coahuila. Since his report, Dalquest +(Louisiana State Univ. Studies, Biol. Sci. Ser. No. 1:162, December +28, 1953) extended the known distribution of this species +approximately 225 miles southward into San Luis Potosi, where he +reported animals from five localities. Field workers from the Museum +of Natural History at the University of Kansas recently have taken +_goldmani_ in the Mexican states of Chihuahua, Coahuila, Durango, +Zacatecas and San Luis Potosi, and now we can define, with greater +accuracy, the geographic range of this species (see fig. 1 and list +of specimens examined). + +Goldman (_loc. cit._), relying chiefly on external appearance, placed +_goldmani_ in the _desertorum_ group, now known as the _lepida_ group +(Goldman, Jour. Mamm., 13:67, February 9, 1932). Blossom (Occ. Papers +Mus. Zool., Univ. Michigan, 315:3, May 29, 1935) thought that +_goldmani_ might be a subspecies of _lepida_ but that intergradation +between the two had not been demonstrated. Our newly acquired +material, instead of confirming the opinions of Goldman and Blossom, +shows that _goldmani_ is more closely related to _Neotoma albigula_. + +Externally _goldmani_ resembles _Neotoma lepida_ (examples from +California, Utah, and Colorado) in having long, silky pelage; +ochraceous buffy coloring, especially along sides; and underparts +basally plumbeous except for a small throat patch where the hairs are +entirely white in some individuals. In _albigula_ this patch of white +hairs usually is much larger and more conspicuous. Cranially, instead +of resembling the _lepida_ group (including _Neotoma stephensi_), +_goldmani_ looks more nearly like a miniature _albigula_ (specimens of +_albigula_ from Coahuila). The auditory bullae, in relation to the +length of the skull, are of comparable size in _goldmani_ and +_albigula_ whereas those of the _lepida_ group are proportionately +much larger. Moreover, the posterior margin of the palatal bridge is +concave in _goldmani_ and _albigula_ instead of truncate as in the +_lepida_ group. _Neotoma goldmani_ differs from both _albigula_ and +_lepida_ in: ascending branches of premaxillaries broader posteriorly; +supraorbital ridges less pronounced; rostrum less massive; +interparietal broader in relation to width of cranium; interorbital +space, relative to length of skull, wider; and upper molar teeth +broader in relation to their length. + + [Illustration: FIGURE 1. Distribution of the pigmy woodrat, + _Neotoma goldmani_. Solid circles represent specimens + examined; hollow circles represent others reported but not + examined.] + +The baculum of _goldmani_, when compared with bacula and with figures +of these bones in Burt and Barkalow (Jour. Mamm., 23:291 and 293, +August 13, 1942) of species representing the _floridana_, _lepida_, +_albigula_, _mexicana_, _fuscipes_, and _cinerea_ groups, was found to +resemble most closely the baculum of _albigula_ in general proportions +(ratio of length to lateral diameter of base) and in having a distinct +knob at the distal end. The baculum of _goldmani_ differs slightly +from that of _albigula_ in having a less downwardly curved shaft and +in having a less pronounced median dorsal depression at the proximal +end. Although _goldmani_ bears some external resemblance to _lepida_, +the cranial characters mentioned above and the size and shape of the +baculum show that _goldmani_ is best arranged as a member of the +_albigula_ group. + + [Illustration: FIGURE 2. Dorsal, end (proximal), and lateral + views of the baculum of _Neotoma goldmani_, adult, No. 40758 + KU, x 5.] + +Measurements (in millimeters) of the mature baculum (fig. 2, No. 40758 +KU) are: total length, 6.2; lateral diameter of base, 2.6; +dorso-ventral diameter of base, 1.4; lateral diameter of the shaft +near the middle of the bone, 0.6. Except for being smaller, the bacula +of the younger _goldmani_ are like the mature ones. + +Assistance with field work is acknowledged from the Kansas University +Endowment Association and the National Science Foundation. The figures +were drawn by Victor Hogg. Bacula were prepared for study following +the method outlined by White (Jour. Mamm., 32:125, February 15, 1951). + + _Specimens examined._--Total, 15, all in the Museum of + Natural History at the University of Kansas. Localities + within any one state are arranged from north to south. + _Chihuahua_: Sierra Almagre, 6000 ft., 12 mi. S Jaco, 1. + _Coahuila_: 17 mi. N and 8 mi. W Saltillo, 5200 ft., 2; 3 mi. + SE Torreon, 3800 ft., 7. _Durango_: 1 mi. SSE Mapimi, 4100 + ft., 1; 4 mi. WSW Lerdo, 3800 ft., 1; 5 mi. SE Lerdo, 3800 + ft., 1. _Zacatecas_: Conception del Oro, 7680 ft., 1. _San + Luis Potosi_: 10 mi. NE San Luis Potosi, 6000 ft., 1. + + _Other records._--_Coahuila_: Jaral; Saltillo (Goldman, + 1910:82). _San Luis Potosi_: Cerro Penon Blanco; Ventura; + Santa Teresa; city of San Luis Potosi (Dalquest, _loc. + cit._). + + _Transmitted February 8, 1955._ + + + 25-7820 + + + + + +End of the Project Gutenberg EBook of The Pigmy Woodrat, Neotoma goldmani, +Its Distribution and Systematic Position, by Dennis G. Rainey and Rollin H. 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