The missing anatomy of the living coelacanth, Latimeria chalumnae (Smith, 1939)

Johnston, Peter

doi:10.3897/vz.72.e84274

Cited by 3 publications

(2 citation statements)

References 48 publications

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“…The spiracular organ (SpO) is an epithelial diverticulum lined with mechanosensory hair cells embedded in the wall of the spiracle/spiracular chamber (remnant of the first pharyngeal cleft) in representatives of all groups of extant jawed vertebrates: cartilaginous fishes; non-teleost ray-finned fishes excluding bichirs; and the lobe-finned lungfishes and coelacanth (see e.g., Allis, 1889; Agar, 1906; Norris and Hughes, 1920; Barry and Bennett, 1989; Johnston, 2022). In sharks and skates (elasmobranchs), the SpO is embedded in connective tissue near the articulation between the hyomandibula and the braincase (Barry and Boord, 1984; Barry et al, 1988a; Barry and Bennett, 1989) (Fig.…”

Section: Introductionmentioning

confidence: 99%

The skate spiracular organ develops from a unique neurogenic placode, distinct from lateral line placodes

Gillis

Criswell

Baker

2023

Preprint

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The spiracular organ is an epithelial pouch or tube lined with mechanosensory hair cells, found embedded in the wall of the spiracle/spiracular chamber (remnant of the first pharyngeal cleft) in many non-teleost jawed fishes. It is innervated via a branch of the anterior lateral line nerve and usually considered a specialised lateral line organ, although it most likely functions as a proprioceptor for jaw movement. It is homologous to the paratympanic organ: a hair cell-lined epithelial pouch embedded in the wall of the middle ear (which evolved from the spiracular chamber) of birds, alligators and Sphenodon. A previous fate-mapping study showed that the chicken paratympanic organ and its afferent neurons originate from a molecularly distinct placode immediately dorsal to the geniculate (first epibranchial) placode. Here, DiI fate-mapping in a cartilaginous fish (little skate, Leucoraja erinacea) shows that the spiracular organ derives from a previously unrecognised neurogenic placode immediately dorsal to the geniculate placode and molecularly distinct from lateral line placodes. These findings further support the developmental and evolutionary independence of this unique jawed-vertebrate mechanosensory organ from the lateral line system.

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Section: Introductionmentioning

confidence: 99%

The skate spiracular organ develops from a unique neurogenic placode, distinct from lateral line placodes

Gillis

Criswell

Baker

2023

Preprint

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“…However, virtual imaging techniques have been barely used to study fossil coelacanths, featuring the recent description of the Triassic genus Foreyia from Switzerland (Cavin et al, 2017), some on-going studies involving the Mesozoic genera Whiteia and Libys (Gausden, 2022;Manuelli & Cavin, 2022) and a new unnamed Carboniferous genus (Mondéjar Fernández et al, 2022). By contrast, our knowledge of the anatomy and biomechanics of the living coelacanth Latimeria chalumnae has greatly benefited from virtual imaging techniques (e.g., Cloutier et al, 1988;Cupello et al, 2015;Cupello, Meunier, Herbin, Janvier, et al, 2017;Dutel et al, 2013Dutel et al, , 2014Dutel, Herbin, Clément, & Herrel, 2015;Johnston, 2022;Lauridsen et al, 2022;Mansuit et al, 2019Mansuit et al, , 2020Manuelli et al, 2023;Schulzte & Cloutier, 1991).…”

Section: Introductionmentioning

confidence: 99%

Reconstructing an ancient fish: Three‐dimensional skeletal restoration of the head of Mawsonia (Sarcopterygii, Actinistia) using CT scan, and an adjusted model for body size estimation in fossil coelacanths

Toriño,

Dutel,

Soto

et al. 2024

Journal of Anatomy

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Mawsonia constitutes one of the most conspicuous fossil coelacanth taxa, due to its unique anatomy and possible maximum body size. It typifies Mesozoic coelacanth morphology, before the putative disappearance of the group in the fossil record. In this work, the three‐dimensional cranial anatomy and body size estimations of this genus are re‐evaluated from a recently described specimen from Upper Jurassic deposits of Uruguay. The 3D restoration was performed directly on the material based on anatomical information provided by the living coelacanth Latimeria and previous two‐dimensional restorations of the head of Mawsonia. The montage was then scanned with computed tomography and virtually adjusted to generate an interactive online resource for future anatomical, taxonomic and biomechanical research. In general terms, the model constitutes a tool to improve both the anatomical knowledge of this genus and its comparison with other coelacanths. It also facilitates the evaluation of possible evolutionary trends and the discussion of particular features with potential palaeobiological implications, such as the anterior position of the eye and the development of the pseudomaxillary fold. Regarding the body size, a previous model for body size estimation based on the gular plate was submitted to OLS, RMA, segmented linear and PGLS regressions (including the evaluation of regression statistics, variance analysis, t‐tests and residual analysis). The results point to a power relationship between gular and total lengths showing a better support than a simple linear relationship. The new resulting equations were applied to the studied individual and are provided for future estimates. Although an isometric evolutionary growth cannot be rejected with the available evidence, additional models developed with other bones will be necessary to evaluate possible hidden evolutionary allometric trends in this group of fishes, thus avoiding overestimates.

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Vergleichende Entwicklungsgeschichte — A Festschrift on the occasion of the 80th birthday of Prof. Dr. Wolfgang Maier, Tübingen

Werneburg¹,

Ruf²

2022

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Following the traditional and holistic concept of Vergleichende Entwicklungsgeschichte, Wolfgang Maier studied different aspects of vertebrate morphology, including dentition, the locomotor apparatus, nasal and ear regions. His work comprises investigations on pre- to postnatal stages of extant species as well as fossils and is mainly based on histological serial sections, but also on µCT data in recent years. This resulted in an integrative research agenda on the evolutionary biology of mammals and other vertebrates. Most of his studies are designed around the interrelationship of ontogenetic and functional adaptations and evolutionary transformations. The present collection in Vertebrate Zoology collates a series of research articles related to and in honor of Wolfgang Maier’s work. Invited colleagues of Maier provide current insights to their own research, in many cases inspired by his scholarship, ranging from mammalian to reptilian and fish comparative anatomy. In total, this volume contains 19 publications. They apply modern and traditional techniques to investigate the diversity of biological form. In so doing, they integrate traditional conceptual frameworks from the earliest days of morphological research more than two centuries ago.

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The missing anatomy of the living coelacanth, Latimeria chalumnae (Smith, 1939)

Cited by 3 publications

References 48 publications

The skate spiracular organ develops from a unique neurogenic placode, distinct from lateral line placodes

The skate spiracular organ develops from a unique neurogenic placode, distinct from lateral line placodes

Reconstructing an ancient fish: Three‐dimensional skeletal restoration of the head of Mawsonia (Sarcopterygii, Actinistia) using CT scan, and an adjusted model for body size estimation in fossil coelacanths

Vergleichende Entwicklungsgeschichte — A Festschrift on the occasion of the 80th birthday of Prof. Dr. Wolfgang Maier, Tübingen

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