Amby is Greek for "a cup", stoma is Greek for "a mouth"
jeffersonianum is in honor of Jefferson College in Canonsburg, PA and indirectly for the naturalist/President Thomas Jefferson.
4.3 - 7 in. (10.7 - 18 cm)
|Virginia Record Length:|
8.3 in. (21 cm)
Virginia Wildlife Action Plan Rating Tier IV - Moderate Conservation Need - The species may be rare in parts of its range, particularly on the periphery. Populations of these species have demonstrated a significant declining trend or one is suspected which, if continued, is likely to qualify this species for a higher tier in the foreseeable future. Long-term planning is necessary to stabilize or increase populations.
PHYSICAL DESCRIPTION: The body is comparatively long and moderately slender. Above, they are dark brown to almost black, with pale blue flecks on the lower sides. The old adults sometimes have the blue spots lacking. here are usually 12 costal grooves. The toes are long and slender. The length of this species is up to 185 mm *1009*. Mature males are large, long-legged, broad snouted, and light-colored. The females are gray to gray-brown with fine bluish flecks *985*.
REPRODUCTION: Courtship behavior has shown that this species departs radically from the typical Ambystomid pattern, engaging in a type of amplexus *940*. They naturally breed in vernal or transient pools and mating and egg-laying may be completed in a few nights to a week. The onset of breeding activity is assumed to be triggered by the first early warm spring rains or other condi- tions of high humidity and temperatures above freezing *978*. It is probable that photoperiod is also a factor *995*. Upon receiving the right stimuli, they migrate from their woodland locations to breeding pools *978*. In March or early April the adults migrate to breeding ponds for egg-laying. Fertiliz- ation is internal by means of spermatophores. The male sometimes embraces the female, his foreleg behind hers. The females usually outnumber the males and often bid for attention during the mating season. The eggs are in small cylindrical masses containing on the average about 16, and are attached to slender twigs or other support below the surface of quiet pools or ponds. The number per mass varies from 7-40 and several masses complete the complement, which may total over 200 eggs. The incubation period varies from 30-45 days *1009*.
BEHAVIOR: They occupy mixed and deciduous woods with swamps, pools, and slow streams. They are often extremely abundant on river flats, where they hide by day beneath old logs, bark, or other surface cover *1009*. Portions of living and dead plants are important in providing refuge to breeding adults and developing larvae *995,977,988*. There is a need for egg mass attachment *995, 988,865*. The egg masses are generally concentrated around the outer perimeter in sunny locations of breeding pools and attached to vegetation or other plant debris *978*. This species exhibits defensive behavior where it raises its hindquarters, holds its tail vertically, and waves the tail from side to side while keeping its head and forebody near the ground *964*. During the defen- sive display, the tail exudes a sticky white substance. Apparantly it does not release gland contents from different portions of the body independently *872*. The eggs are laid in seasonal ponds, field ponds and sinkholes *3914*. By day, they rest under leaves and other submerged objects in breeding ponds *949*. At night, aquatic juveniles migrate upward in ponds and remain suspended in a the stratum near the surface, where they feed *2936*. Aquatic-stage juvenile rest under debris on the pond bottom *949*; land-stage juvenile or sub-adults rest beneath ground debris (old logs, leaves, etc.) *867*. They are often abundant on river flats *867*.ORIGIN: This species is native *3913*. Population parameters: There is high larval and/or juvenile mortality and low recruitment. A typical breeding pool hatches numerous animals that may prey on the eggs and/or larvae, but the pool usually has sufficient cover for many larvae to survive *978*.
AQUATIC/TERRESTRIAL ASSOCIATIONS: This species is associated with Ambystoma maculatum, Notophthalmus v. viridescens, Eurycea longicauda longicauda and Entomostraca sp. *3914,949,2936*.
References for Life History
*Click on a thumbnail for a larger version.
|Allegheny Co. egg mass||Allegheny Co. yolk plug stage egg mass||Larvae from
|Bath Co.||Gravid Female||Gravid Female||Gravid Female Douthat State Park||Douthat State Park|