Leis' conundrum: Homology of the clavus of the ocean sunfishes. 2. Ontogeny of the median fins and axial skeleton of Ranzania laevis (Teleostei, Tetraodontiformes, Molidae)

  title={Leis' conundrum: Homology of the clavus of the ocean sunfishes. 2. Ontogeny of the median fins and axial skeleton of Ranzania laevis (Teleostei, Tetraodontiformes, Molidae)},
  author={G David Johnson and Ralf Britz},
  journal={Journal of Morphology},
One of the most conspicuous characters of the ocean sunfishes, family Molidae, is the punctuation of the body by a deep, abbreviated, caudal fin‐like structure extending vertically between the posterior ends of the dorsal and anal fins, termed the clavus by Fraser Brunner. Homology of the clavus has been a matter of debate since the first studies on molid anatomy in the early 1800s. Two hypotheses have been proposed: 1) It is a highly modified caudal fin; 2) It is formed by highly modified… 

Leis' conundrum: Homology of the clavus of the ocean sunfishes. 1. Ontogeny of the median fins and axial skeleton of Monotrete leiurus (Teleostei, Tetraodontiformes, Tetraodontidae)

The ontogeny of the axial skeleton and median fins of the Southeast Asian freshwater puffer Monotrete leiurus is described, based on a reared developmental series, and the proximal‐middle radials of the dorsal and anal fins are upright and symmetrical and their distal tips coalesce during development to form a deep band of cartilage, from which the spherical distal radials are spatially separated.

Occipito‐vertebral fusion in ocean sunfishes (Teleostei: Tetraodontiformes: Molidae) and its phylogenetic implications

It is concluded that the shared occipito‐vertebral fusion in molids and ostraciids and its otherwise extremely rare occurrence among teleosts provide support for a sister‐group relationship of the two families.

A comparative ontogenetic study of the tetraodontiform caudal complex

It is shown that an ontogenetic approach offers considerable elucidation of the homology of the caudal complex of adult Tetraodontiformes, resulting in a new understanding of the grundplan of these fishes.

Peripheral nervous system of the ocean sunfish Mola mola (Tetraodontiformes: Molidae)

The cutaneous branch innervation pattern in the claval fin rays was clearly identical with that in the dorsal and anal fin rays, but differed significantly from that inThe caudal finrays, providing strong support for the hypothesis that the clavus comprises highly modified components of the anterior and anal fins.

When two equals three: developmental osteology and homology of the caudal skeleton in carangid fishes (Perciformes: Carangidae)

The ontogenetic development of the caudal skeleton of Caranx crysos is document by examining a series of cleared and stained larval and postlarval specimens and emphasizing the power and importance of ontogeny in the identification of primary homology.

A developmentally “tail-less” adult cowfish, Lactoria cornuta, from Oman (Ostraciidae, Tetraodontiformes)

A “tail-less” specimen of the ostraciid Longhorn Cowfish, Lactoria cornuta, collected along the coast of Oman, has only small rudiments of the caudal fin and a much shortened caUDal peduncle in which the posteriormost vertebrae are either abnormally developed or fused.

Ontogeny of the jaw apparatus and suspensorium of the Tetraodontiformes

Among Tetraodontiformes, the Triacanthodidae retain a protrusible upper jaw and a versatile suspensorium, and the Ostraciidae are exceptional in having the distal part of the autopalatine reduced, while the proximal part remains attached to the Suspensorium.

A new family of gymnodont fish (Tetraodontiformes) from the earliest Eocene of the Peri-Tethys (Kabardino-Balkaria, northern Caucasus, Russia)

Significantly younger ages are estimated for the diversification of Tetraodontiformes than in previous tip-dating analyses (Jurassic and Early Cretaceous) using the fossilized birth-death process; these new age estimates are in better agreement with the tetraodoniform fossil record.

The caudal skeleton of a 20 mm Triodon and homology of its components

The caudal skeleton of the smallest specimen of a three-tooth puffer on record, a 20 mm standard length Triodon macropterus, is described, re-emphasizing the unexpectedly large number of putatively plesiomorphic characters of Triodon compared to all other plectognaths.

The Developmental Pattern of the Musculature Associated with the Mandibular and Hyoid Arches in the Longnose Gar, Lepisosteus osseus (Actinopterygii, Ginglymodi, Lepisosteiformes)

This is the first in a planned series of studies in which it is shown that the ceratomandibular ligament that attaches the ceratohyal with the retroarticular process of the lower jaw is homologous with the mandibulohyoid ligament.



Notes on the Anatomy and Relationships of the Ocean Sunfish (Mola mola)

The fish was caught off Sandy Hook in the lower bay of New York on September 15, 1932 and weighed 175 pounds, which is only about one-tenth the maximum weight recorded by Jordan and Evermann,2 Nevertheless it seems that Mola probably goes on increasing in weight long after the testes attain maturity.

Osteology, phylogeny, and higher classification of the fishes of the order Plectognathi (Tetraodontiformes)

The osteologjof over 160 species of fossil and Recent plectognath or tetraodontiform fishes is described and illustrated in relation to the supposed phylogeny and proposed higher classiflcation

Phylogeny of the ocean sunfishes (Molidae, Tetraodontiformes), a highly derived group of teleost fishes

Abstract A phylogenetic hypothesis based on the cladistic analysis of 48 morphological characters for the pelagic tetraodontiform ocean sunfishes of the family Molidae is proposed. Strong support is

The familial phylogeny of the Tetraodontiformes (Acanthopterygii: Pisces) : as evidenced by their comparative myology

This analysis suggests that theTriacanthodidae and Triacanthidae are sister groups, and separated off first from the ancestral stock, as well as suggesting systematic changes in the hierarchical classification of tetraodontiforms.

1 - Form, Function, and Locomotory Habits in Fish

Revised procedures for staining and clearing small fishes and other vertebrates for bone and cartilage study

Description d'un procede de coloration contrastee entre le cartilage (grâce au bleu alcian) et l'os (rouge alizarin S) et d'eclaircissement des tissus par l'utilisation d'enzymes et/ou d'hydroxyde de

Studies on the plectognaths . 4 . The body muscles

  • Ark Zool
  • 1913

On the origin of heterocercy and the evolution of the fins and finrays of fishes

  • Rep US Comm Fish Fisher
  • 1886

Ontogeny and Systematics of Fishes