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diff --git a/30898.txt b/30898.txt new file mode 100644 index 0000000..6c534b8 --- /dev/null +++ b/30898.txt @@ -0,0 +1,547 @@ +The Project Gutenberg EBook of A New Bog Lemming (Genus Synaptomys) From +Nebraska, by J. Knox Jones + +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: A New Bog Lemming (Genus Synaptomys) From Nebraska + +Author: J. Knox Jones + +Release Date: January 9, 2010 [EBook #30898] + +Language: English + +Character set encoding: ASCII + +*** START OF THIS PROJECT GUTENBERG EBOOK BOG LEMMING (GENUS SYNAPTOMYS) *** + + + + +Produced by Chris Curnow, Joseph Cooper and the Online +Distributed Proofreading Team at https://www.pgdp.net + + + + + + + + + +A New Bog Lemming (Genus Synaptomys) +From Nebraska + +BY + +J. KNOX JONES, JR. + +=University of Kansas= +=Lawrence= +1958 + + + + +=University of Kansas Publications= +=Museum of Natural History= + +Volume 9, No. 13, +pp. 385-388 + +May 12, 1958 + + +Editors: E. Raymond Hall, Chairman, Henry S. Fitch, +Robert W. Wilson + + +PRINTED IN +THE STATE PRINTING PLANT +TOPEKA, KANSAS + +1958 + +27-3033 + + + + +A New Bog Lemming (Genus Synaptomys) + +From Nebraska + + +BY + +J. KNOX JONES, JR. + + +In the autumn of 1952, I obtained a southern bog lemming, _Synaptomys +cooperi_, at Rock Creek State Fish Hatchery, Dundy County, in extreme +southwestern Nebraska. This locality of record is the westernmost for +the species in North America. Subsequently, I reported this specimen in +the literature (Univ. Kansas Publ., Mus. Nat. Hist., 7:486, 1954), +provisionally assigning it to _Synaptomys cooperi gossii_, the +subspecies occurring in eastern Nebraska. In late November of 1956, J. +R. Alcorn collected three additional bog lemmings at the Rock Creek +Hatchery. + +These specimens from Dundy County represent a relict population that +differs in several characteristics from _S. c. gossii_, and that differs +also from all other subspecies of the species. This relict population +is, therefore, here given subspecific recognition. + + +#Synaptomys cooperi relictus#, new subspecies + +_Type._--Adult female, skin and skull, University of Kansas Museum of +Natural History no. 51617, from Rock Creek State Fish Hatchery, 5 mi. N, +2 mi. W Parks, Dundy County, Nebraska; obtained November 1, 1952, by J. +Knox Jones, Jr., original no. 995. + +_Distribution._--Known only from the type locality. + +_Diagnosis._--Size large for the species, both externally and cranially; +dorsal pelage dark; nasals broadly flared anteriorly (especially broad +in relation to nasal length); auditory bullae small; molariform +tooth-rows and incisive foramina long. + +_Measurements (in millimeters)._--External measurements of the type +specimen, followed by those of another adult female (KU 72603), are: +Total length, 141, 145; length of tail-vertebrae, 24, 21; length of hind +foot, 20, 20; length of ear from notch, 11, 12. The type specimen +weighed 46.3 grams. Cranial measurements were taken in the manner +described by Wetzel (Jour. Mamm., 36:2-3, 1955) except that he did not +record the occipitonasal length. These cranial measurements of the type +and KU 72603 are: Occipitonasal length, 30.2, 29.8; condylobasilar +length, 27.2, 27.1; zygomatic breadth, 18.1, 17.9; lambdoidal breadth, +14.2, 13.8; length of nasals, 8.2, 8.3; breadth of nasals, 4.2, 4.0; +length of rostrum, 6.6, 6.6; breadth of rostrum, 6.1, 5.9; breadth of +upper incisors, 4.6, 4.2; length of maxillary tooth-row, 8.5, 8.4; +length of incisive foramen, 5.8, 5.5; interorbital breadth, 3.1, 3.5. + +_Comparisons._--From _Synaptomys cooperi gossii_ (specimens from eastern +Nebraska and eastern Kansas, including one topotype), _S. c. relictus_ +differs in: Dorsal coloration, in comparable pelages, darker, venter +lacking buffy tinge; skull averaging larger in all cranial dimensions +(except rostral length, which is approximately the same), especially +breadth of upper incisors and length of molariform tooth-rows; nasals +broader anteriorly; auditory bullae nearly equal in size, thus +relatively smaller. From _Synaptomys cooperi paludis_ (holotype and +paratypes) of Meade County, Kansas, _S. c. relictus_ differs in: Skull +averaging smaller in all cranial measurements except rostral length and +breadth of upper incisors, which are approximately the same, and breadth +of nasals, length of incisive foramina and length of molariform +tooth-rows, which measure more; nasals relatively (48 per cent of length +of nasals) as well as actually broader anteriorly; anterior border of +zygomatic plate more concave; auditory bullae smaller; infraorbital +foramina larger when viewed anterolaterally. _S. c. relictus_ closely +resembles _S. c. paludis_ in color and external proportions. + +_Remarks._--The total population of _Synaptomys cooperi relictus_ may be +small because the only suitable habitat known to me for these mice is +the dense, grassy area, approximately 100 yards wide and one mile long, +around some of the rearing ponds and along the creek at Rock Creek +Hatchery. It has been taken there in association with _Cryptotis parva +parva_, _Blarina brevicauda carolinensis_, _Reithrodontomys megalotis +dychei_, _Peromyscus maniculatus nebrascensis_, _Microtus ochrogaster +haydenii_, and another relic, _Microtus pennsylvanicus finitis_. All +specimens of the newly named bog lemming are from the border zone +between the wet-substrate habitat of _M. p. finitis_ and the drier +habitat occupied by _M. o. haydenii_. Approximately 3000 trap nights +produced the four known specimens. + +_S. c. relictus_, like _S. c. paludis_, represents a relict population +of the more southwesterly distribution of the subgenus _Synaptomys_ +during Wisconsin and post-Wisconsin times. Additional relict populations +likely will be found in the eastern Great Plains. + +The new subspecies is intermediate in some features between _paludis_ +and _gossii_. The type locality is separated from that of _paludis_ (14 +mi. SW Meade, Meade County, Kansas) by a distance of approximately 220 +miles over habitats largely unsuitable for bog lemmings. The nearest +locality of record for S. c. _gossii_ to the east of the type locality +of _relictus_ is at Hunter, Mitchell County, Kansas (see Cockrum, Univ. +Kansas Publ., Mus. Nat. Hist., 7:196, 1952), approximately 200 miles +distant. The locality of record of _gossii_ in Nebraska nearest to the +type locality of _relictus_ is even farther eastward--1 mi. N Pleasant +Dale, Seward County (KU 50188). + +_Specimens examined._--Four, from the type locality (KU 51617, +72601-03). + +_Transmitted March 11, 1958._ + + + + + +End of the Project Gutenberg EBook of A New Bog Lemming (Genus Synaptomys) +From Nebraska, by J. 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