| Crotalus lannomi | |
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| Conservation status | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Subphylum: | Vertebrata |
| Class: | Reptilia |
| Order: | Squamata |
| Suborder: | Serpentes |
| Family: | Viperidae |
| Subfamily: | Crotalinae |
| Genus: | Crotalus |
| Species: | C. lannomi |
| Binomial name | |
| Crotalus lannomi Tanner, 1966 |
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| Synonyms | |
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Crotalus lannomi is a venomous pitviper species found in Mexico in Jalisco. Known from only a single specimen. No subspecies are currently recognized.[3]
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Known only from a single specimen: a female 63.8 cm in length that is presumed to be an adult. The presence of some larger scales on top of its head and a longer tail are traits that Tanner (1966) suggested are primitive. Mostly on this basis, he opinion was that this species is most closely related to C. stejnegeri, even though its head and body are not as slender as that of C. stejnegeri.[2]
Found in western Mexico in Jalisco. Known only from the type locality, which is given as "1.8 miles west of the pass, Puerto Los Mazos, or 22 miles west by road from the Río Tuxcacuesco, a branch of the Rio America on Mexican Highway No. 80, Jalisco, Mexico."[1]
This species is classified as Data Deficient (DD) on the IUCN Red List of Threatened Species (v3.1, 2001).[4] Species are listed as such when there is inadequate information to make a direct, or indirect, assessment of its risk of extinction based on its distribution and/or population status. It may be well studied, and its biology well known, but appropriate data on abundance and/or distribution are lacking. Data Deficient is therefore not a category of threat. Listing of taxa in this category indicates that more information is required and acknowledges the possibility that future research will show that threatened classification is appropriate. It is important to make positive use of whatever data are available. In many cases great care should be exercised in choosing between DD and a threatened status. If the range of a taxon is suspected to be relatively circumscribed, and a considerable period of time has elapsed since the last record of the taxon, threatened status may well be justified. The population trend is unknown. Year assessed: 2007.[5]
In July 2008, this species of rattlesnake was rediscovered in foothills of Colima, Mexico. It was first found by Ginny N Weatherman and she was the first to see this species alive, she then showed the specimen to the other herpetologists in her party that had been searching for C. Lannomi, namely Jacobo Reyes-Velasco, Christoph I. Grünwald and Jason M. Jones.[6]