Limits...
Lung anatomy and histology of the extant coelacanth shed light on the loss of air-breathing during deep-water adaptation in actinistians

View Article: PubMed Central - PubMed

ABSTRACT

Lungs are specialized organs originated from the posterior pharyngeal cavity and considered as plesiomorphic for osteichthyans, as they are found in extant basal actinopterygians (i.e. Polypterus) and in all major groups of extant sarcopterygians. The presence of a vestigial lung in adult stages of the extant coelacanth Latimeria chalumnae is the result of allometric growth during ontogeny, in relation with long-time adaptation to deep water. Here, we present the first detailed histological and anatomical description of the lung of Latimeria chalumnae, providing new insights into its arrested differentiation in an air-breathing complex, mainly represented by the absence of pneumocytes and of compartmentalization in the latest ontogenetic stages.

No MeSH data available.


Related in: MedlinePlus

The vestigial lung of the extant coelacanth Latimeria chalumnae. (a) Three-dimensional reconstruction of the adult specimen CCC 22 (130 cm TL) in right lateral view. (b) Details of the three-dimensional reconstruction of the lung of the adult specimen CCC 28, corresponding to the boxed area in (a). (c) Partial dissection of the lung of the adult specimen CCC 3, exhibiting its lumen in the ventral view. Yellow, oesophagus and stomach; red, vestigial lung; blue, fatty organ. White arrows point to two hard but flexible plates. 1, 2, 3, 4 indicate the four successive areas of the vestigial lung. Scale bars, 10 cm (a); 1 cm (b); 0.5 cm (c).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC5383850&req=5

RSOS161030F1: The vestigial lung of the extant coelacanth Latimeria chalumnae. (a) Three-dimensional reconstruction of the adult specimen CCC 22 (130 cm TL) in right lateral view. (b) Details of the three-dimensional reconstruction of the lung of the adult specimen CCC 28, corresponding to the boxed area in (a). (c) Partial dissection of the lung of the adult specimen CCC 3, exhibiting its lumen in the ventral view. Yellow, oesophagus and stomach; red, vestigial lung; blue, fatty organ. White arrows point to two hard but flexible plates. 1, 2, 3, 4 indicate the four successive areas of the vestigial lung. Scale bars, 10 cm (a); 1 cm (b); 0.5 cm (c).

Mentions: Here, we describe the general morphology through partial dissections (figure 1), three-dimensional reconstructions (figure 1), histology (figures 2–4) and virtual thin-sections of long-propagation phase-contrast synchrotron X-ray microtomography (figure 4) of the lung of various developmental stages of the extant coelacanth L. chalumnae.Figure 1.


Lung anatomy and histology of the extant coelacanth shed light on the loss of air-breathing during deep-water adaptation in actinistians
The vestigial lung of the extant coelacanth Latimeria chalumnae. (a) Three-dimensional reconstruction of the adult specimen CCC 22 (130 cm TL) in right lateral view. (b) Details of the three-dimensional reconstruction of the lung of the adult specimen CCC 28, corresponding to the boxed area in (a). (c) Partial dissection of the lung of the adult specimen CCC 3, exhibiting its lumen in the ventral view. Yellow, oesophagus and stomach; red, vestigial lung; blue, fatty organ. White arrows point to two hard but flexible plates. 1, 2, 3, 4 indicate the four successive areas of the vestigial lung. Scale bars, 10 cm (a); 1 cm (b); 0.5 cm (c).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5383850&req=5

RSOS161030F1: The vestigial lung of the extant coelacanth Latimeria chalumnae. (a) Three-dimensional reconstruction of the adult specimen CCC 22 (130 cm TL) in right lateral view. (b) Details of the three-dimensional reconstruction of the lung of the adult specimen CCC 28, corresponding to the boxed area in (a). (c) Partial dissection of the lung of the adult specimen CCC 3, exhibiting its lumen in the ventral view. Yellow, oesophagus and stomach; red, vestigial lung; blue, fatty organ. White arrows point to two hard but flexible plates. 1, 2, 3, 4 indicate the four successive areas of the vestigial lung. Scale bars, 10 cm (a); 1 cm (b); 0.5 cm (c).
Mentions: Here, we describe the general morphology through partial dissections (figure 1), three-dimensional reconstructions (figure 1), histology (figures 2–4) and virtual thin-sections of long-propagation phase-contrast synchrotron X-ray microtomography (figure 4) of the lung of various developmental stages of the extant coelacanth L. chalumnae.Figure 1.

View Article: PubMed Central - PubMed

ABSTRACT

Lungs are specialized organs originated from the posterior pharyngeal cavity and considered as plesiomorphic for osteichthyans, as they are found in extant basal actinopterygians (i.e. Polypterus) and in all major groups of extant sarcopterygians. The presence of a vestigial lung in adult stages of the extant coelacanth Latimeria chalumnae is the result of allometric growth during ontogeny, in relation with long-time adaptation to deep water. Here, we present the first detailed histological and anatomical description of the lung of Latimeria chalumnae, providing new insights into its arrested differentiation in an air-breathing complex, mainly represented by the absence of pneumocytes and of compartmentalization in the latest ontogenetic stages.

No MeSH data available.


Related in: MedlinePlus