Cynomops Thomas, 1920

López Berrizbeitia, M Fernanda & Díaz, M Mónica, 2021, Cynomops planirostris (Chiroptera: Molossidae), Mammalian Species 53 (1013), pp. 174-185 : 174-175

Cynomops Thomas, 1920

Dysopes: Temminck, 1827:232 . Part, not Dysopes Illiger, 1811 .

Molossus: W. Peters, 1866:575 . Part, not Molossus É. Geoffroy Saint-Hilaire, 1805 .

Molossops W. Peters, 1866:575 . Part; described as a subgenus of Molossus É. Geoffroy Saint-Hilaire, 1805 .

Myopterus: W. Peters, 1869:402. Not Myopterus É. Geoffroy Saint-Hilaire, 1818.

Molossus: O. Thomas, 1901a:190 . Not Molossus É. Geoffroy Saint-Hilaire, 1805 .

Molossus: O. Thomas, 1901b:440 . Not Molossus É. Geoffroy Saint-Hilaire, 1805 .

Molossops: O. Thomas, 1911:113 . Not Molossops W. Peters, 1866 .

Molossops: Osgood, 1914:183 . Not Molossops W. Peters, 1866 .

Cynomops: O. Thomas, 1920:189 . Type species Molossus cerastes O. Thomas, 1901b , by original designation.

Cynops Podtiaguin, 1944:28 . Incorrect subsequent spelling of Cynomops O. Thomas, 1920 .

Cinomops Esbérard and Bergallo, 2005:514. Incorrect subsequent spelling of Cynomops O. Thomas, 1920 .

CONTEXT AND CONTENT. Order Chiroptera , suborder Yangochiroptera , family Molossidae , subfamily Molossinae , genus Cynomops . The genus Cynomops has been considered as a subgenus of Molossops by some authors ( Goodwin and Greenhall 1961; Freeman 1981; Koopman 1993, 1994; Simmons and Voss 1998) and a synonym by others ( Cabrera 1958; Muñoz Arango 2001). Husson (1962) used Cynomops as a valid genus, but later ( Husson 1978) used Molossops . Gardner (1977) mentioned that Randolph L. Peterson favored generic status for both Molossops and Cynomops , restricting Molossops to its type species, M. temminckii ( Peters, 1866) and included all other currently recognized species under Cynomops (see Peterson 1965). Chromosomal studies (Linares and Kiblisky 1969; Baker 1970; Warner et al. 1974; Gardner 1977) reported cytogenetic differences between these genera. Currently, based on chromosomal number, molecular data, and cranial, dental, external, and postcranial morphological differences, Cynomops is recognized as a distinct genus ( Barquez et al. 1999; Peters et al. 2002; Simmons 2005; Eger 2008; Ammerman et al. 2012; Gregorin and Cirranello 2015) containing eight species: C. abrasus , C. freemani , C. greenhalli , C. mastivus , C. mexicanus , C. milleri , C. planirostris , and C. tonkigui ( Moras et al. 2018; Burgin et al. 2020). The divergence between Cynomops and Molossops was estimated at about 20 Ma ( Ammerman et al. 2012). The following key to species of the genus Cynomops is modified from Moras et al. (2018).

1. Large size, forearm (FA) longer than 41 mm; greatest length of skull (GLS): males> 20 mm, females> 18.5 mm; ventral coloration slightly paler than dorsum......................... 2 Small size, FA shorter than 40 mm; GLS: males <19 mm, females <18 mm; ventral coloration may be much paler in at least part of the belly, throat, and thorax ................. 3

2. Skull robust (GLS: males = 22.30–24.71 mm, females = 19.15–20.96 mm); anterior face of the lacrimal ridges forming an abrupt angle with the forehead; accessory foramen located closer to the incisive foramina; massive and concave mandible in males.............................. C. mastivus Skull gracile and small (GLS: males = 19.94–22.26, females = 18.39–20.49); anterior face of the lacrimal ridges sloping smoothly to the forehead; accessory foramen separated from the incisive foramina by a large gap; gracile mandible in males ......................... C. abrasus

3. Rostrum relatively low, with anterior face of the lacrimal ridges sloping smoothly to the forehead; incisive and accessory foramina arranged in the shape of an equilateral triangle when viewed from above .................................... 4 Rostrum relatively high, with anterior face of the lacrimal ridges forming an abrupt angle with the forehead; incisive and accessory foramina arranged in the shape of an isosceles triangle .................................................................... 6 4. Large size (FA: males = 36.80–37.05 mm, females = 33.02– 36.30 mm; GLS: males = 17.80–18.78 mm, females = 15.87–17.57 mm); venter paler than dorsum; median ridge on lingual face of the second lower premolar vestigial or absent; deep fossa in the posterior squamosal bone where the zygomatic arch meets the braincase ...................................................................... C. mexicanus Small size (FA: males <36.50, females <35.00; GLS: males <17.50, females <16.20); median ridge on lingual face of the second lower premolar well-developed; shallow fossa in the posterior squamosal bone where the zygomatic arch meets the braincase..........................................................5

5. Bicolored dorsal hairs, with the basal one-half pale-buff; ventral pelage coloration much paler than dorsum, at least at the gular and midventral region, whitish or pale-buff colored ......................................................... C. planirostris Dorsal hair with only one-fourth basal pale-buff and darker ventral coloration without paler or whitish marks ......................................................................... C. tonkigui

6. Rostrum relatively narrow (postorbital breadth: males = 4.35–4.52 mm, females = 4.19–4.36 mm); gracile and relatively straight mandible in males; first lower premolar is one-half or less of height of the lower second premolar......................................................... C. freemani Rostrum relatively broad (postorbital breadth: males> 4.50 mm, females> 4.30 mm); massive mandible with a concave corpus along its length in males; first lower premolar is two-thirds or more of the height of the lower second premolar.................................................................. 7

7. Smaller size (FA: males = 34.00–37.00 mm, females = 30.30–35.00 mm; GLS: males = 16.71– 18.23 mm, females = 15.49–16.51 mm); rostrum relatively short (maxillary toothrow length: males = 6.61–6.87 mm, females = 5.38–6.29 mm); basal one-half of each dorsal hair pale-buff; nasal process of the premaxilla reduced with lateral margin of the external nares concave ......................................................................... C. milleri Larger size (FA: males = 35.00– 39.7 mm, females = 33.40–38.28 mm; GLS: males = 17.37– 19.23 mm; females = 15.91–17.82 mm); long rostrum (maxillary toothrow length: males = 6.79–7.67 mm, females = 6.22–7.05 mm); first one-third of each dorsal hair pale-buff; nasal process of the premaxilla welldeveloped, with lateral margin of the external nares straight ...................................................... C. greenhalli