Coleonyx switaki (MURPHY, 1974)
Can you confirm these amateur observations of Coleonyx switaki?
|Higher Taxa||Eublepharidae, Gekkota, Sauria, Squamata (lizards: geckos)|
|Common Names||E: Switak’s Banded Gecko|
G: Gebänderter oder Switaks Barfuß-Gecko
S: Geco Descalzo
|Synonym||Anarbylus switaki MURPHY 1974|
Coleonyx swaitaki [sic] — STEBBINS 1985: 112
Coleonyx switaki — KLUGE 1993
Coleonyx switaki — RÖSLER 2000: 63
Coleonyx switaki— PIANKA & VITT 2003: 39
Coleonyx switaki — SEUFER et al. 2005
|Distribution||USA, Mexico (from San Diego County, SW California southward to the vicinity of San Ignacio in C Baja California, Mexico)|
Type locality: “5.5 miles west of San Ignacio (27 'N, 112 51'W) along Mexican Highway 1, Baja California Sur, Mexico, 500 feet elevation.”
|Types||Holotype: CAS 139472|
|Diagnosis||Diagnosis. Coleonyx switaki differs from other Coleonyx in these characters: deep rostral depression; reduced transverse sub-digital lamellae; 48-70 scales around the non-regenerated tail; tip of ventral portion of tail tuberculate; diploid complement of 24 chromosomes consisting of a graded series of 22 metacentric and 2 acrocentric chromosomes with each 2 pairs conspicuously larger than those following when ranked by size; bright yellow breeding color in males; dorsal pattern a series of transverse spots arranged in bands, sometimes modified; 6-11 bands between nape of neck and caudal constriction;nuchal loop absent; derived adult color pattern present in juveniles; S-shaped isthmus of the thyroid gland [Grismer 1990].|
Diagnosis (Anarbylus): The genus Anarbylus was defined by Murphy (1974) on the basis of three seemingly unique characters: (1) presence of a single enlarged postnasal scal (2) lack of transverse subdigital lamell and (3) a unique karyotype. Murphy (1974) stated that no other eublepharine gecko possessed a single enlarged postnasal scale. Fritts et al. (1982) demonstrated the variability of this character in both Baja California Sur and southern California populations of A. switaki, noting that either one or two postnasal scales may be present. I have also observed a single postnasal scale in C. reticulatus and C. brevis. Murphy (1974) distinguished Anarbylus from Aeluroscalabotes, Eublepharis and Coleonyx by its lack of tranverse subdigital lamellae. The lamellae, however are only slightly reduced in relation to those homologous rows in C. variegatus Murphy (1974) distinguished Anar and C. brevis and merely extend a trend of decreasing size found within the genus Coleonyx. Hence, Grismer 1983 synonymized Anarbylus with Coleonyx.
|Comment||Synonymy: Grismer (1999) elevated gypsicolus to full species status based on scale counts: it has 42-48 eyelid fringe scales versus 32-40 in Coleonyx switaki switaki.|
Variation: C. switaki is a highly variable species. See Grismer 2001 for a series of photos that show the many color patterns rnaging from spotted to banded.
|Etymology||Named after Karl H. Switak, Supervising Herpetologist of the Steinhart Aquarium, San Francisco, CA.|
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