Sorex ibarrai Matson and McCarthy, 2005,

Matson, John O. & Ordóñez-Garza, Nicté, 2017, The taxonomic status of Long-tailed shrews (Mammalia: genus Sorex) from Nuclear Central America, Zootaxa 4236 (3), pp. 461-483: 478-479

publication ID

https://doi.org/10.11646/zootaxa.4236.3.3

publication LSID

lsid:zoobank.org:pub:3972C854-F755-4639-B942-30A3FA4151EC

persistent identifier

http://treatment.plazi.org/id/03EC8783-FFF2-FFA5-FF7B-FA8A006FFB9F

treatment provided by

Plazi

scientific name

Sorex ibarrai Matson and McCarthy, 2005
status

 

Sorex ibarrai Matson and McCarthy, 2005 

Ibarra’s Shrew

Sorex veraepacis ibarrai Matson And McCarthy, 2005: 68  . Type locality: “ Guatemala, Departamento de El Progreso, Municipio San Augustín Acasaguastlan [sic], Reserva de Biosfera Sierra de las Minas, Cerro Pinalón, Camino de las Torres, 2700 m; 15 ° 4'54" N, 89 ° 55'59" W.GoogleMaps 

Holotype. Adult, female, skin, skull, and partial postcranial skeleton; CMNH No. 113283, collected 3 May 1998 by John O. Matson and field party (original number JOM 6823, M685), the animal was lactating.

Distribution. Known from mountains south and southeast of Cobán, in Alta Verapaz, Baja Verapaz, and El Progreso, Guatemala.

Diagnosis. Sorex ibarrai  is a member of the Sorex veraepacis  species group. It is the largest member of this species group ( Table 1 and Figure 5View FIGURE 5) and one of the largest New World Sorex  . U3 is usually <U4, but in some individuals U3 Ĺ U4. Pelage color of the adult female holotype was reported as Clove Brown above, scarcely paler below, by Matson and McCarthy  (2005). Upon reassessment, we now regard the color as being Chaetura Black. Specimens of S. ibarrai  from the Sierra de las Minas are the darkest of the S. veraepacis  species group. Some specimens have white tipped guard hairs on the dorsum. The tail is slightly bicolor. Specimens from other populations (Biotopo Quetzal, Chelemhá, Finca Chinaux, and El Limo) are essentially of the same coloration. Sorex ibarrai  averages larger in all body and skull measurements than any Sorex  southeast of the Isthmus of Tehuantepec ( Table 1 and Figure 5View FIGURE 5), except for length of unicuspid toothrow, which less than in S. chiapensis  , S. veraepacis  , and the new Sierra Madre species.

Description. Sorex ibarrai  differs from S. veraepacis  by averaging larger in most measurements; it has a shorter mandible relative to skull length; and, its braincase is less inflated. Compared to S. chiapensis  and the undescribed species from the Sierra Madre, it is absolutely larger in all measurements. It is the darkest of the S. veraepacis  species group.

Ecology. Found in cloud forests of the mountains south and southeast of Cobán, in Alta Verapaz, Baja Verapaz, and El Progreso, Guatemala ( Matson & McCarthy  2005; Woodman 2011b; Matson et al. 2014). Dominant cloud forest trees that make up the habitat include Persea sessilis  , Persea verticulata, Quercus  sapoteifolia, tree ferns ( Cyathea  sp.), Podocarpus oleifolius  , and various other conifers ( Matson & McCarthy  2005; Woodman et al. 2012). Known altitudinal range is 1475 m to 2800 m. Woodman et al. (2012) summarized data on reproduction in S. ibarrai  . Essentially, most reproduction (pregnant or lactating individuals) occurs in the wet season (April through July), with limited reproduction in the drier months. This same pattern has been found in many cloud forest small mammals ( Rickart 1977; Vásquez et al. 2000; Matson et al. 2012). Small mammal associates include Cryptotis goodwini  , Habromys lophurus, Handleyomys  rhabdops, Heteromys desmarestianus, Marmosa  mexicana, Microtus guatemalensis, Nyctomys  sumichrasti  , Peromyscus grandis  , P. oaxacensis  , Reithrodontomys microdon  , R. sumichrasti  , R. tenuirostris  , and Microtus guatemalensis  ( Matson & McCarthy  2005; Matson et al. 2014).

Specimens examined (146). Guatemala, Alta Verapaz, Chelemhá , 2100 m ( CM 120111View Materials 120123; USNM 569840, 569841, 569855, 569860, 569892, 569907, 569908, 569923, 569929, 569942, 569950, 569973–569976)  ; Alta Verapaz, Finca Chinaux , 2040–2190 m ( CM 120125View Materials – 120144)  ; Baja Verapaz, Biotopo del Quetzal , ( USAC 71–73, 75, 78, 79, 80, 4043)  ; Baja Verapaz, Salamá , ( USAC 70View Materials)  ; El Progreso, Cerro Pinalón , 2560–2800 m ( CM 113277View Materials –113294; USAC 3735, 3736, uncatalogued USAC [NS 28; JOM 6860; TJM 9705, 9709; SGP 300, 400, 401, 426, 438, 714, 715, 724; M 708, 718]); El Progresso, 3 km W Pinalón Reserva de Biosfera Sierra de las Minas ( MVZ 223391View Materials)  ; Zacapa, 6 km NNW San Lorenzo , 2200 m ( CM 113295View Materials –113317; USAC 28–31View Materials, uncatalogued, USAC [JOM 6743, 6744, 6745, 6773, 6774; SGP 430, 477–480, 488, 499, 501–503, 508, 509, 684, 696])  ; Zacapa, El Limo , 1475 m ( USNM 570021, 570026, 570027, 570050, 570051, 570069, 570070). 

USNM

Smithsonian Institution, National Museum of Natural History

USAC

University of Western Australia

MVZ

Museum of Vertebrate Zoology, University of California Berkeley

Kingdom

Animalia

Phylum

Chordata

Class

Mammalia

Order

Soricomorpha

Family

Soricidae

Genus

Sorex

Loc

Sorex ibarrai Matson and McCarthy, 2005

Matson, John O. & Ordóñez-Garza, Nicté 2017
2017
Loc

Sorex veraepacis ibarrai Matson And McCarthy, 2005 : 68

McCarthy 2005: 68
2005