taxonID	type	description	language	source
03ED87FBFF8A3231FF7977043F49F84A.taxon	discussion	The documented molecular and morphological variability of Naja kaouthia suggests that the species, as currently conceptualised, may contain additional cryptic diversity. This raises the question of which potential daughter taxon would retain the name Naja kaouthia Lesson in case of a split. Since the holotype appears to be lost (Leviton et al., 2003; Kramer 1977), this cannot currently be verified by recourse to a name-bearing type. In his original description of the species, Lesson (1831) did not state an explicit type locality, beyond the words “ Inde continentale ” in the title of his account. The type locality indicated by Lesson (Bengale = Bengal) is extremely imprecise. At the time of the description of Naja kaouthia, under the rule of the East India Company, the term “ Bengal ” referred to not only the territories of the present-day country of Bangladesh and the Indian state of West Bengal, but also most of the present-day Indian states of Bihar and Jharkhand, and extended across a physiographically diverse landscape from the Himalayan foothills through the Ganges and Brahmaputra floodplains to the Ganges Delta. It thus seems highly likely that the monocled cobras found within this area may encompass extensive phylogeographic structure and cryptic diversity. Consequently, we consider it important to anchor the name of this medically important species through the designation of a well-documented neotype. Since it seems likely that Lesson’s type originated from the vicinity of Kolkata (formerly Calcutta), the capital of the Bengal Presidency, we have selected a well-preserved specimen from near Kolkata to serve as neotype, anchoring the name Naja kaouthia to the monocled cobras found in that area.	en	Balchan, Neil R., Esquerré, Damien, Wogan, Guinevere O. U., Wüster, Wolfgang (2025): A review of geographic variation in the monocled cobra, Naja kaouthia Lesson, 1831 (Serpentes: Elapidae) with the designation of a neotype. Zootaxa 5717 (4): 488-516, DOI: 10.11646/zootaxa.5717.4.2, URL: https://doi.org/10.11646/zootaxa.5717.4.2
03ED87FBFF8A3231FF7977043F49F84A.taxon	materials_examined	Neotype: FMNH 165082, adult male collected from Taldelal, Canning Thana [= Canning Police Station], 24 Parganas, West Bengal, India, on 12 January 1966 by G. A. Schad (Figure 8). Type Locality: “ Inde continentale ” [= continental India]. Further restricted to “ Bengale, Inde ” [= NE India or Bangladesh] by Lesson (1832: 313). David et al. (2023 a) provide a more restricted type locality specified as the “ region of Kolkata and the mouth of the Ganges / Ganga River, West Bengal State, India ”. We restrict the type locality to 24 Parganas, West Bengal, India here by neotype selection.	en	Balchan, Neil R., Esquerré, Damien, Wogan, Guinevere O. U., Wüster, Wolfgang (2025): A review of geographic variation in the monocled cobra, Naja kaouthia Lesson, 1831 (Serpentes: Elapidae) with the designation of a neotype. Zootaxa 5717 (4): 488-516, DOI: 10.11646/zootaxa.5717.4.2, URL: https://doi.org/10.11646/zootaxa.5717.4.2
03ED87FBFF8A3231FF7977043F49F84A.taxon	description	Description of the Neotype Dimensions: Snout-vent length 1005 mm, tail length 183 mm. Scalation: 180 ventrals, 54 subcaudals (all divided); anal scale entire. Head Scalation: 7 / 7 supralabials, third and fourth enter orbit, third contacts both nasal and orbit; 8 / 8 infralabials (excluding cuneates); two small cuneates inserted between the mouth edge and infralabials 4 and 5 and infralabials 5 and 6 on each side; nasal almost entirely divided by large vertical slit-shaped nostril; one preocular, three postoculars; preocular in contact with nasal and internasal; prefrontals of approximately the same size as the internasals; frontal approximately square shaped; anterior chin shields contact first four infralabials; posterior chin shields slightly shorter and narrower than anterior. Dorsal Pattern: Head brown in color, with the sides lighter than the upper surface and grading into cream colored supralabials; base color of dorsal side of the body is similar shade of brown to the head; interstitial skin is a darker brown than the scales, except in areas comprised of lighter markings where the skin is pale in color; dorsal side of the body with a distinct buff band following the hood mark that is 2 – 3 scales wide and flanked with thin black band of scales on either side; bands transition into light variegations running the length of the body. Throat and Ventral Pattern: First 11 ventrals mostly cream-coloured; ventrals 18 – 22 totally covered in dark pigment, forming a solid band across the throat; remainder of venter transitions quickly from cream-coloured to dark brown; the outer edges of the 12 th – 14 th ventrals and the lower half of the adjoining lowest dorsal scale row are covered in dark pigment, forming a lateral spot on each side of the throat. A midventral incision runs the entire length of the specimen and viscera are absent. Hood Marking: The hood mark is of the classical monocellate shape associated with the species, consisting of a single light-colored ocellus outlined in black pigmentation, with the scales in the center and outside of the ocellus being the same brown color as the rest of the dorsum; the lowest scale row involved on each side is the 9 th (where black pigment begins), the maximum width of the ocellus is 13 scale rows (from edge to edge, including black pigment).	en	Balchan, Neil R., Esquerré, Damien, Wogan, Guinevere O. U., Wüster, Wolfgang (2025): A review of geographic variation in the monocled cobra, Naja kaouthia Lesson, 1831 (Serpentes: Elapidae) with the designation of a neotype. Zootaxa 5717 (4): 488-516, DOI: 10.11646/zootaxa.5717.4.2, URL: https://doi.org/10.11646/zootaxa.5717.4.2
03ED87FBFF8A3231FF7977043F49F84A.taxon	discussion	History of the name-bearing type The holotype, formerly held at Muséum National d’Histoire Naturelle (MNHN) in Paris, France was a specimen (with no identifying number given) illustrated (Figure 9) in Lesson, 1832 in Bélanger (1831 – 1834: pl. 2) (R. - P. Lesson [Astrolabe Voy.], 1826 – 1829). This specimen was subsequently lost fide Kramer (1977: 752) and this was reiterated by Leviton et al. (2003) and Wallach et al. (2014). The type specimen was probably originally deposited in the collections of the Muséum National d’Histoire Naturelle, Paris, France, but could not be found during deliberate search efforts (P. David pers. comm.) and thus is untraced and considered to be lost (David et al. 2023 a). Lesson (1831) described N. kaouthia, presumably with respect to the illustrated type specimen, as a “ beautiful species quite distinct from the Capel or spectacled snake [= Naja naja]. Ventral plates, 188; caudals, 53 pairs. ” We designate FMNH 165082 as neotype for Naja kaouthia to clarify the taxonomic status of this species and stabilize the type locality, satisfying the qualifying conditions outlined by Article 75.3 of the International Code of Zoological Nomenclature (International Commission on Zoological Nomenclature 1999). The neotype selected herein was collected by Gerhard A. Schad on 12 January 1966 in 24 Parganas, West Bengal, India. Schad (1928 – 2009) was an accomplished parasitologist, lifelong birder, and keen naturalist with eclectic interests (Murrell & Hawdon 2009). For a portion of his career, Schad was based at the Johns Hopkins International Center for Medical Research in Kolkata as the Head of Parasitology, where he investigated the parasites of organisms ranging from humans to tigers, but with a distinct interest in snake hookworms. During his time in India, Schad collected and carefully prepared a series of N. kaouthia from several localities (Figure 10) in 24 Parganas, West Bengal, which are maintained in the holdings of the Field Museum of Natural History. He presumably studied the parasite fauna of these snakes (evidenced by midventral incisions running the length of each specimen and absence of viscera), though no published works from Schad refer to these specimens.	en	Balchan, Neil R., Esquerré, Damien, Wogan, Guinevere O. U., Wüster, Wolfgang (2025): A review of geographic variation in the monocled cobra, Naja kaouthia Lesson, 1831 (Serpentes: Elapidae) with the designation of a neotype. Zootaxa 5717 (4): 488-516, DOI: 10.11646/zootaxa.5717.4.2, URL: https://doi.org/10.11646/zootaxa.5717.4.2
03ED87FBFF8A3231FF7977043F49F84A.taxon	etymology	Etymology Naja: Derived from “ naya ”, a Sinhala word meaning cobra, originally referring to populations of Naja naja in Sri Lanka (Wüster & Tillack 2023). kaouthia: Keuta (also spelled Kewat, Keot, or Kaibartta) is a Hindu caste in West Bengal and other parts of Eastern and Northern India traditionally associated with fishing and boating in freshwater environments. Naja kaouthia is locally known by the name “ keute ” in Bengal because of its aquatic habits, and “ kaouthia ” may be an eponym of keute / keuta. The specific epithet is often reported as having derived from a Bengali word meaning monocle, in reference to the monocellate hood marking.	en	Balchan, Neil R., Esquerré, Damien, Wogan, Guinevere O. U., Wüster, Wolfgang (2025): A review of geographic variation in the monocled cobra, Naja kaouthia Lesson, 1831 (Serpentes: Elapidae) with the designation of a neotype. Zootaxa 5717 (4): 488-516, DOI: 10.11646/zootaxa.5717.4.2, URL: https://doi.org/10.11646/zootaxa.5717.4.2
03ED87FBFF8A3231FF7977043F49F84A.taxon	diagnosis	Diagnosis Naja kaouthia is known to occur in sympatry (or parapatry) with six other congeners across its distribution: N. naja, N. siamensis, N. atra, N. fuxi, N. sumatrana, and N. mandalayensis. In addition, Naja kaouthia may be confused with N. oxiana, N. sagittifera, N. philippinensis, N. samarensis, and N. sputatrix which do not co-occur with the former. Naja kaouthia is characterized as possessing 170 – 199 ventral and 46 – 59 subcaudal scales, and generally has 2 – 3 cuneate scales on each side of the head (Ratnarathorn et al. 2023; Shi et al. 2022; Wüster & Thorpe 1994). The hood mark is typically monocellate in shape, though one or both sides of the mark may be connected by a band across the body of the snake. The hood mark may be lacking entirely, or in rare cases, aberrations may result in a disconnection of the monocellate marking at one or both ends, giving the appearance of a halfmoon, U-shaped, or paired bracket shaped marking. Naja kaouthia is a non-spitting cobra throughout most of its range, though individuals in India, Nepal, Bangladesh, and Bhutan may spit venom (Bhattacharjee et al. 2022; Giri et al. 2021; Rahman et al. 2024; Santra & Wüster 2017). In areas where Naja kaouthia co-occurs with spitting cobras, lack of venom spitting upon provocation serves as a reliable indicator for this taxon. In northern India, it may be distinguished from sympatric Naja naja by having ≤ 29 scale rows at the 10 th ventral (usually> 29 in sympatric Naja naja), typically having 21 midbody scale rows (usually 23 in Naja naja), and typically distinct lateral throat spots encroaching only on the 1 st scale row (vs. indistinct throat spots encroaching on the second dorsal scale row in Naja naja), and by its monocle-shaped hood mark (Wüster 1998). It may be distinguished from Naja mandalayensis by lacking spitting adapted fangs, lacking dark mottling on the throat (extensive dark mottling on the throat of adult Naja mandalayensis obscures the lateral throat spots), single or absent dark bank on the throat (≥ 2 dark bands on the throat and ventral surface in Naja mandalayensis), and monocle-shaped hood mark (Slowinski & Wüster 2000). It may be distinguished from Naja siamensis by lacking spitting adapted fangs, a higher number of ventral scales (170 – 192 in Naja kaouthia vs. 153 – 174 in N. siamensis), a monocle-shaped hood mark (U-, V-shaped, or absent in Naja siamensis), usually ≥ 1 cuneate scale (typically 1 per side in Naja siamensis), and squarish frontal scale (Wüster & Thorpe 1994). Naja kaouthia may be most readily confused with Naja atra and Naja fuxi, which are both superficially alike to the former and exist in sympatry and / or parapatry across large (and currently poorly defined) areas of Indochina. Naja kaouthia may be distinguished from Naja atra by its higher ventral scale (170 – 192 in Naja kaouthia vs. 161 – 175 Naja atra) and lower subcaudal (46 – 57 in Naja kaouthia 33 – 50 in Naja atra) scale counts (Shi et al. 2022). Naja kaouthia may be distinguished from Naja fuxi by lacking a pre-intrusive gular scale situated between the anterior chin shields, a scalation feature that is always present in Naja fuxi (Ratnarathorn et al. 2023). It may be distinguished from Naja oxiana by a lower ventral (170 – 192 in Naja kaouthia vs. 193 – 210 in Naja oxiana) and subcaudal scale count (46 – 59 in Naja kaouthia 63 – 71 in Naja oxiana), usually ≥ 1 cuneate scale (generally 0 – 1 per side in Naja oxiana), presence of lateral throat spots (absent in Naja oxiana), and monocle-shaped hood marking (Wüster 1998). It may be distinguished from Naja sagittifera by a lower subcaudal scale count (46 – 59 in N. kaouthia vs. 60 – 64 in Naja sagittifera), a much more expansive South and Southeast Asian distribution (Naja sagittifera is endemic to the Andaman Islands), and overall difference in body coloration, with Naja kaouthia generally being a uniform brown coloration at all life stages (with some irregular body patterning) while Naja sagittifera is nearly black in coloration in adulthood with grey crossbands and a monocle-shaped hood mark and inversely colored as a juvenile with dark body coloring and light markings (Whitaker & Captain 2008; Wüster 1998). It may be distinguished from Naja sumatrana by having> 25 dorsal scale rows at the level of the 10 th ventral (≤ 25 in Naja sumatrana) and 21 dorsal scale rows at 20 % and 40 % ventral scale lengths (normally 19 rows in Naja sumatrana), and a monocle-shaped hood marking (Wüster 1990). It may be distinguished from Naja samarensis by having> 25 dorsal scale rows at the level of the 10 th ventral scale (≤ 25 in Naja samarensis) and 21 dorsal scale rows at 20 % and 40 % ventral scale lengths (≤ 19 rows in Naja samarensis), and a monocle-shaped hood marking (Wüster 1990). It may be distinguished from Naja philippinensis by having a higher subcaudal scale count (46 – 57 in N. kaouthia vs. 36 – 44 in Naja philippinensis), distinct throat pattern (lacking in Naja philippinensis), and a monocle-shaped hood marking (Wüster 1990). Naja kaouthia may be distinguish from Naja sputatrix, by having fewer dorsal scale rows at the 10 th ventral (> 25 in Naja kaouthia vs. ≤ 27 in Naja sputatrix), more scale rows at 20 % ventral scale length (21 in Naja kaouthia vs. <21 in Naja sputatrix), and typically fewer ventral scales (170 – 192 in Naja kaouthia vs. <175 or <181 in male and female Naja sputatrix, respectively), and a monocle-shaped hood marking (Wüster 1990).	en	Balchan, Neil R., Esquerré, Damien, Wogan, Guinevere O. U., Wüster, Wolfgang (2025): A review of geographic variation in the monocled cobra, Naja kaouthia Lesson, 1831 (Serpentes: Elapidae) with the designation of a neotype. Zootaxa 5717 (4): 488-516, DOI: 10.11646/zootaxa.5717.4.2, URL: https://doi.org/10.11646/zootaxa.5717.4.2
