Species Description: Geissler P, Poyarkov JR NA, Grismer L, Nguyen TQ, An HT. Neang T, Kupfer A, Ziegler T, Boehme W, Mueller H 2015 (2014) New Ichthyophis species from Indochina (Gymnophiona, Ichthyophiidae): 1. The unstriped forms with descriptions of three new species and the redescriptions of I. acuminatus Taylor 1960, I. youngorum Taylor, 1960 and I. laosensis Taylor, 1969. Organisms Diversity & Evolution DOI 10.1007/s13127-014-0190-6
The collars are wider and deeper than the head and the body. The second collar is longer than the first in the ventral view. Both collars grooves are incomplete, visible from the ventral view, and curve slightly towards the head. The first collar groove is indistinct in the middle of the dorsum but still visible from the dorsal view on the outer edges of the dorsum. The second collar groove disappears on the ventral halves of the flanks and is not visible in the dorsal view. There is a slight depression on the ventrum at the anterior midline. The nuchal region sits just anterior to the first annular groove. The specimens discovered have between 322 and 364 annuli along their backs. Of these, only 60 annuli near the tail extend across both the belly and back. Those grooves that do cross the belly do so in a straight line before the cloacal disc interrupts them. The grooves on the dorsum form a double-S shape along the vertebral line. The species has 120 vertebrae. Small, oval scales are found on the posterior half of the annuli positioned in a single row in each scale pocket. The cloacal slit is longitudinal and interrupts six aunnuli. It is found on a triangular cloacal disc with five denticulations on the right and six on the left. There are between four and five annuli after the cloacal disc. The species does not have a true tail, instead the body tapers at the tail end with a nipple-like tail cap. The last annular groove does not cross the ventrum (Geissler et al. 2014).
Ichthyophis cardamomensis differs from other unstriped Indochinese caecilians in several ways including eye size, snout projection, location of tentacle, number of inner mandibular teeth, scale location, number of annuli, and number of vertebrate. More specifically, I. cardamomensis has larger eyes than I. acuminatus but smaller eyes and a larger snout projection than I. chaloensis. The tentacle of Ichthyophis cardamomensis is located closer to the nares when compared to I. catlocensis but closer to the eyes when compared to I. javanicus. Ichthyophis cardamomensis has a greater number of inner mandibular teeth than I. billitonensis, I. lakimi, I. larutensis, and I. weberi. It differs from I. bombayensis, I. dulitensis, I. laosensis, I. singaporensis, I. monochrous and I. sumatranus in the fact that I. cardamomensis does not have scales on the front half of its body. It differs from I. acuminatus, I. monochrous, I. orthoplicatus, and I. sikkimensis by having more annuli. And it differs from I. acuminatus, I. glandulosus and I. youngorum by having more vertebrate (Geissler et al. 2014).
In the preservative, I. cardamomensis has a blackish grey dorsal coloration and a lighter grey ventral coloration. The cloacal disc and terminal cap are whitish. There are also whitish margins around the eyes, tentacles, and nares. In life, I. cardamomensis has a uniform pinkish hazelnut brown coloration that brightens on its sides and belly. The lips, nostrils, and tentacles are whitish pink. The annular coloration is darker than the anular grooves (Geissler et al. 2014).
Among the specimens found, there was variation in the number of annuli and tooth count from the original holotype. However, the coloration, the shape of the annuli, scales missing from the front side of the body, a single scale row at the tail end of the body, and the presence of two rounded patches of glandular skin found on the tongue was consistent with the holotype (Geissler et al. 2014).
Distribution and Habitat
Life History, Abundance, Activity, and Special Behaviors
Trends and Threats
Ichthyophis cardamomensis is part of the Ichthyophis genus, a group of caecilians native to Indochina. Based on Maximum Likelihood, Maximum Parsimony, and Bayesian Inference analyses on 660 base pairs of COI and 1296 base pairs of cyt b, I. cardamomensis is most closely related to I. nguyenorum. Together, I. cardamomensis and I. nguyenorum are sister to a clade consisting of I. bannaincus and an unnamed Ichthyophis species (Geissler et al. 2014).
Ichthyophis cardamomensis gets its specific epithet from the area where it was found, the Cardamom region (Geissler et al. 2014).
Historically, the Indochinese caecilians have been organized by the presence or absence of a lateral stripe along the body of the caecilian; this is now being questioned as they believe that the lateral stripe is a homoplasy that has reoccurred in different, not closely related lines. Ichthyophis cardamomensis (which is unstriped) and its sister species, I. nguyenorum (which is striped), are interesting examples of this (Geissler et al. 2014).
Geissler, P., Poyarkov Jr, N.A., Grismer, L., Nguyen, T. Q., An, H.T., Neang, T., Kupfer, A., Ziegler, T., Böhme, W., Müller, H. (2015). ''New Ichthyophis species from Indochina (Gymnophiona, Ichthyophiidae): 1. The unstriped forms with descriptions of three new species and the redescriptions of I. acuminatus Taylor, 1960, I. youngorum Taylor, 1960 and I. laosensisOrganisms Diversity and Evolution, 15, 143-174.
Written by Hannan Mir (hmir15 AT simons-rock.edu), Bard College at Simon’s Rock
First submitted 2017-01-04
Edited by Ann T. Chang (2017-01-14)
Species Account Citation: AmphibiaWeb 2017 Ichthyophis cardamomensis <http://amphibiaweb.org/species/8301> University of California, Berkeley, CA, USA. Accessed Dec 15, 2018.
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Citation: AmphibiaWeb. 2018. <http://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 15 Dec 2018.
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