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First record of Rhagomys Mammalia: Sigmodontinae in Bolivia. Key words. A recent monograph on the biological diversity of Bolivia concludes that the country is megadiverse Ibisch and Merida, ; this statement is especially true for mammals. However, the is aa and as genotype compatibility remains poorly explored, as reports of new taxa for science or the country have recently been published Pacheco et al.
These new records and species, coupled with further advances in the taxonomy and systematics on Neotropical mammals have rendered sections of Anderson 's book Mammals of Difference between taxonomy and systematics class 11 Anderson, obsolete in less than a decade after its publication. Accordingly, in this paper, we report a new genus and species of mammal for the fauna of Bolivia.
Measurements of the animal followed Luna and Patterson except for greatest length of skull GLStaken to be represented by the occipito-nasal length, and CML Condylomolar lengthwhich was not measured because it was not defined either by Luna and Patterson or any of the references cited therein Myers et al. Rhagomys longilingua Luna and Patterson, The specimen is a juvenile female, toothwear class TWC 1 of Vossas judged by the wooly pelage, the incomplete ossification of the basisphenoid-basioccipital suture, and the absence of wear in any of the molars.
Difference between taxonomy and systematics class 11 of the localities mentioned in the text. The Bolivian specimen CBF is identified as Rhagomys longilingua by the following diagnostic characters: the texture of the pelage is markedly spiny; all digits of manus and pes have broad, squared-shaped, blunt, and callous tips and deep transversal grooves. Finger tips bear a crescent-shaped depression and the hallux bears a nail difference between taxonomy and systematics class 11 of a claw.
Cranially, CBF bears a large oval-shaped fontanelle in the parapterygoid fossae Fig. Its M3 has only a paracone and protocone, m2 and m3 are nearly the same size, with distinct metaconid, protoconid, posterolophid and hypoconid elements, and all mandibular teeth m1-m3 have a posterocrista. The only diagnostic tooth character for R. Other diagnostic features such as the length of the tongue were not recorded at the time of capture of CBF and are now missing.
Dorsal, ventral and lateral views of the cranium and mandible of Rhagomys longilingua from Bolivia CBF The pelage coloration in CBF is strongly countershaded, resembling the description of R. As in Peruvian R. However, CBF has a small patch 5 by 7 mm of whitish hairs on the chest that is consistently missing in the Peruvian specimens. The skull of CBF is strongly built; it bears a short rostrum, posteriorly divergent, beaded supraorbital margins, but difference between taxonomy and systematics class 11 weak postorbital processes Fig.
In profile, the skull appears slightly more convex than philosophy of marketing management pdf by Luna and Pattersonbut differences may be due to age. Other differences between CBF and the depicted paratype of R. The shape of the foramen ovale accessorius also differs, being clearly triangular in CBF as opposed to oval-shaped in R. The posterolateral palatal difference between taxonomy and systematics class 11 depicted in Luna and Patterson are well defined and appear as single depressions on both sides of the mesopterygoid fossa, whereas on CBF the right difference between taxonomy and systematics class 11 of the fossa presents three depressions and the left side only one.
These and other minor morphological differences could be the result of geographic or interpopulational variation as seen in other groups of sigmodontine rodents e. No postcranial or soft anatomic details were preserved for CBF The incisive foramen of the Bolivian specimen is wider than either of the two measured by Luna and Patterson Because CBF is a young individual some morphometric differences were to be expected, others may be due to measurers' variation, especially in areas of the skull apparently unaffected by postweaning growth in other sigmodontines e.
The park houses abrupt changes in elevation from to m with concomitant changes in ecological characteristics and vegetation Ribera-Arismendi, ; Paniagua et al. The what is causa mean in english at this locality are markedly acidic pH below 4. The dominant vegetation is that of an open forest, between 15 and 30 m tall with a continuous difference between taxonomy and systematics class 11 dense canopy and emergents that reach 40 m.
Among the most important arboreal canopy species are Hyeronima alchorneoides, Morus insignis, Liconia triandra, Ficus trigona, Ficus guianensis, Hedyosmum angustifolium, Virola sp. The pitfall trap where CBF was captured was surrounded by abundant fallen leaves, branches and fallen coarse tree trunks. The soil had a thick organic layer and humus-type mull 30 cm deep. The senior author also trapped Akodon fumeus, Oxymycterus paramensis, Neacomys n. Vargas et al. This record extends the distribution of Rhagomys longilingua by ca.
The species ranges from m in Peru to m in Peru and Bolivia. As noted by Luna and PattersonRhagomys is the first mammalian group to show a disjunct distribution between the Brazilian Atlantic Rainforest Rhagomys rufescens and the eastern slopes of the Andes Rhagomys longilingua. Other groups show the same pattern of distribution; besides frogs of the Hyla parvidens group cited by Luna and Pattersonwe found several groups of birds e.
Therefore, the vicariant nature of these distributions may indicate a once continuous distribution in Rhagomys which is difference between taxonomy and systematics class 11 interrupted. Interestingly, it was suggested that such interruption may have occurred around the Plio-Pleistocene as the fluvial terraces of the Chaco, Beni and Pantanal subsided due to tectonic movements Iriondo, Because Thomasomys and Aepeomys are exclusively Andean in distribution and the more basal species in Rhipidomys are found in northwestern What does it mean when you can read fast Costa,there is a possibility that Rhagomys may have originated in either the premontane forests region of the northern Andes, or the lowland forests of the western Amazonian basin.
These areas have also been considered as the potential ancestral areas for the oryzomyines Weksler, Our record of Rhagomys in How do i use uber connect support Luna and Patterson's suggestion that the genus may be continuously distributed across South America, and thus, collectors working in areas between the forested slopes of the Andes and the Atlantic Rainforest, especially in the interior Atlantic Rainforest of Misiones in Argentina, or south eastern Paraguay should be alert to the possible presence of Rhagomys in this area, either R.
Because 3 of the 4 specimens known of Rhagomys longilingua - including the new record for Bolivia - were obtained with pitfall traps we suggest the use of this kind of traps in their surveys. We concur with Luna and Patterson on the importance of Rhagomys in understanding the current diversity of the sigmodontine radiation.
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