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Article

A New Species of Tachymenoides (Serpentes: Dipsadidae: Tachymenini) from Peru with Comments on the Taxonomic Status of Galvarinus tarmensis (Walker, 1945) †

by
Edgar Lehr
1,2,*,
Mikael Lundberg
2,
Juan Carlos Cusi
2,
Jack W. Sites, Jr.
3,
Claudia Torres
2 and
César Aguilar-Puntriano
2
1
Department of Biology, Illinois Wesleyan University, Bloomington, IL 61701, USA
2
Departamento de Herpetología, Museo de Historia Natural Universidad Nacional Mayor de San Marcos, Avenida.Arenales 1256, Jesús María, Lima 15072, Peru
3
Department of Biology, Brigham Young University, 4102 Life Sciences Building, Provo, UT 84602, USA
*
Author to whom correspondence should be addressed.
†
zoobank: urn:lsid:zoobank.org:pub:90E2E300-ED3A-495B-B0CF-E59A6125F63C.
Taxonomy 2025, 5(2), 18; https://doi.org/10.3390/taxonomy5020018
Submission received: 6 January 2025 / Revised: 17 March 2025 / Accepted: 28 March 2025 / Published: 2 April 2025
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Abstract

We describe a new species of snake of the genus Tachymenoides using molecular and morphological evidence. The description is based on 21 specimens (4 females, 17 males) obtained in the regions of Pasco, Junín, and Puno between 2190 and 3050 m elevation. A maximum likelihood phylogenetic tree based on two mitochondrial (12S and cyt-b) genes and one nuclear (c-mos) gene shows that the new species is the sister taxon of T. affinis and distinct from Galvarinus tarmensis, which we transfer back to Tachymenis. The new species has smooth dorsal scales without apical pits usually in 19/17/15 series, 1 preocular, 2 postoculars, 1 loreal undivided nasal scale, 8 supralabials (4th and 5th in contact with the eye), 9 infralabials, 1–2+2–3 temporals, 139–157 ventrals, 52–67 subcaudals, and a divided cloacal scale. The longest specimen, a male, had a total length of 559 mm. Two females contained six and five eggs with small embryos. In life, the dorsum and flanks are olive brown to pale grayish brown with scattered black and cream flecks and no longitudinal stripes. Ventral coloration is highly variable, nearly uniformly black, mottled gray and dark-gray, mottled pale gray and tan, or pale grayish tan. Usually, three irregularly shaped, narrow, longitudinal ventral stripes are present. The iris is brown with a distinct yellowish-tan ringlet.
Keywords: Squamata; reptiles; snakes; Andes; Pasco region; Junín region; Puno region; Tachymenis tarmensis Squamata; reptiles; snakes; Andes; Pasco region; Junín region; Puno region; Tachymenis tarmensis

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MDPI and ACS Style

Lehr, E.; Lundberg, M.; Cusi, J.C.; Sites, J.W., Jr.; Torres, C.; Aguilar-Puntriano, C. A New Species of Tachymenoides (Serpentes: Dipsadidae: Tachymenini) from Peru with Comments on the Taxonomic Status of Galvarinus tarmensis (Walker, 1945). Taxonomy 2025, 5, 18. https://doi.org/10.3390/taxonomy5020018

AMA Style

Lehr E, Lundberg M, Cusi JC, Sites JW Jr., Torres C, Aguilar-Puntriano C. A New Species of Tachymenoides (Serpentes: Dipsadidae: Tachymenini) from Peru with Comments on the Taxonomic Status of Galvarinus tarmensis (Walker, 1945). Taxonomy. 2025; 5(2):18. https://doi.org/10.3390/taxonomy5020018

Chicago/Turabian Style

Lehr, Edgar, Mikael Lundberg, Juan Carlos Cusi, Jack W. Sites, Jr., Claudia Torres, and César Aguilar-Puntriano. 2025. "A New Species of Tachymenoides (Serpentes: Dipsadidae: Tachymenini) from Peru with Comments on the Taxonomic Status of Galvarinus tarmensis (Walker, 1945)" Taxonomy 5, no. 2: 18. https://doi.org/10.3390/taxonomy5020018

APA Style

Lehr, E., Lundberg, M., Cusi, J. C., Sites, J. W., Jr., Torres, C., & Aguilar-Puntriano, C. (2025). A New Species of Tachymenoides (Serpentes: Dipsadidae: Tachymenini) from Peru with Comments on the Taxonomic Status of Galvarinus tarmensis (Walker, 1945). Taxonomy, 5(2), 18. https://doi.org/10.3390/taxonomy5020018

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