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Hell Hollow Slender Salamander vs. Gregarious Slender Salamander

Both are worm-like slender salamanders of the Sierra foothills; their records meet around the Merced River. A: Relatively longer: a gap of 7 to 9.5 costal folds between the toes in the Hell Hollow Slender Salamander; shorter: a gap of 8.5 to 11.5 costal folds between the toes in the Gregarious Slender Salamander. B: Slightly broader feet; toes wider at the base, partly webbed (no open photo shows the feet clearly) in the Hell Hollow Slender Salamander; narrower, slender feet; longer, thinner toes with little or no webbing in the Gregarious Slender Salamander. C: 18 to 20, usually 19 in the Hell Hollow Slender Salamander; 18 to 21, usually 19 or 20 (a little higher on average) in the Gregarious Slender Salamander. D: Plain light grey to slate, with sparse tiny pale flecks (no open photo shows it) in the Hell Hollow Slender Salamander; dark slate-grey, sometimes salt-and-pepper on the belly and chin (no open photo shows it) in the Gregarious Slender Salamander. These are in-hand marks; range decides in the field: north of the Merced River (Hell Hollow) vs south of it (Gregarious).

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Hell Hollow Slender Salamander

Batrachoseps diabolicus

Gregarious Slender Salamander

Batrachoseps gregarius

Photographs via iNaturalist under Creative Commons licences; the photographers are credited on the sheet.

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