Topic
Amphiuma tridactylum
About: Amphiuma tridactylum is a research topic. Over the lifetime, 64 publications have been published within this topic receiving 1058 citations. The topic is also known as: Amphiuma tridactylum.
Papers published on a yearly basis
Papers
TL;DR: The vomeronasal system arose in aquatic tetrapods and did not originate as an adaptation to terrestrial life, which has important implications for the hypothesis that the vomer onasal organ is specialized for detection of non-volatile compounds.
Abstract: Previous reports have indicated that members of the proteid family of salamanders lack a vomeronasal system, and this absence has been interpreted as representing the ancestral condition for aquatic amphibians. I examined the anatomy of the nasal cavities, nasal epithelia, and forebrains of members of the proteid family, mudpuppies (Necturus maculosus), as well as members of the amphiumid and sirenid families (Amphiuma tridactylum and Siren intermedia). Using a combination of light and transmission electron microscopy, I found no evidence that mudpuppies possess a vomeronasal system, but found that amphiuma and sirens possess both vomeronasal and olfactory systems. Amphiumids and sirenids are considered to be outgroups relative to proteids; therefore, these data indicate that the vomeronasal system is generally present in salamanders and has been lost in mudpuppies. Given that the vomeronasal system is generally present in aquatic amphibians, and that the last common ancestor of amphibians and amniotes is believed to have been fully aquatic, I conclude that the vomeronasal system arose in aquatic tetrapods and did not originate as an adaptation to terrestrial life.This conclusion has important implications for the hypothesis that the vomeronasal organ is specialized for detection of non-volatile compounds.
65 citations
TL;DR: It is demonstrated that Amphiuma tridactylum uses two distinct types of suction feeding, which are probably generated by simultaneous contractions of the depressor mandibulae and rectus cervicis.
Abstract: Anatomical studies of cephalic bones and muscles combined with cine and high-speed videographic analyses of feeding demonstrate that Amphiuma tridactylum uses two distinct types of suction feeding. Small or relatively immobile prey generally elicit a stationary capture mode in which mouth opening precedes buccal expansion and there is no forward movement of the head of the salamander. Actively moving prey are captured by a rapid strike during which mouth opening and buccal expansion are synchronous and the extent of buccal expansion is greater than in stationary feeding. Differences between these feeding modes may be due to differences in the timing of contraction of the rectus cervicis muscle. Synchronous hyoid and mandibular excursions during the strike are probably generated by simultaneous contractions of the depressor mandibulae and rectus cervicis, whereas delay of hyoid excursions during stationary capture suggests sequential contraction of the depressor and rectus cervicis.
53 citations
TL;DR: In a urodele, as in the bullfrog but in contrast to the chicken and all nontetrapod species yet studied, pancreatic preproglucagon mRNA encodes aGLP-2 sequence, which has been better conserved during evolution of tetrapods than the sequences of either GLP-1 or GLp-2.
44 citations
TL;DR: The data show that the primary structures of the tachykinins have been very poorly conserved during vertebrate evolution and that pressure has acted only to maintain the functionally important sequence -Phe-Xaa-Gly Leu-Met-NH2 at the COOH-termini of the peptides.
40 citations
TL;DR: It is hypothesized that aquatic salamanders might require a DSP-rich surfactant to prevent the epithelial surfaces from adhering and large amounts of Chol to keep the DSP fluid over a large range of temperatures.
37 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 1 |
| 2018 | 2 |
| 2017 | 1 |
| 2016 | 1 |
| 2015 | 1 |
| 2014 | 1 |