Results 61 to 70 of about 8,625 (225)

Widespread complex enameloid microstructure in teeth and rostral denticles of Cretaceous sclerorhynchoid skates (Rajiformes: †Sclerorhynchoidei)

Journal of Anatomy, EarlyView.
This article demonstrates that the teeth and rostral denticles of an extinct clade of sawfish‐like skates display an extremely derived enameloid microstructure, similar to what is known among sharks. The presence of tooth‐like enameloid microstructure in dermal denticles opens new perspectives about the origins and development of chondrichthyan ...
Endy Chateauneuf‐Gautier, Guillaume Guinot   +1 more
wiley   +1 more source

Chondrichthyes species in deep waters of the Mediterranean Sea

Scientia Marina, 2004
Data collected during the DESEAS survey carried out in three areas of the Mediterranean Sea (Balearic Sea, western and eastern Ionian Sea) were used to describe the distribution and abundance of chondrichthyes species at depths between 600 and 4000 m.
Letizia Sion, Anna Bozzano, Gianfranco D’Onghia, Francesca Capezzuto, Michele Panza   +4 more
doaj   +1 more source

Phylogeny of the manta and devilrays (Chondrichthyes: mobulidae), with an updated taxonomic arrangement for the family

, 2018
DNA sequence data from mitochondrial genomes and c . 1000 nuclear exons were analysed for a complete taxon sampling of manta and devilrays (Mobulidae) to estimate a current molecular phylogeny for the family.
W. White, S. Corrigan, Lei Yang, A. Henderson, A. Bazinet, D. Swofford, G. Naylor   +6 more
semanticscholar   +1 more source

Fish Sperm Subpopulations Detection, Separation, and Application: Current State and Trends

Reviews in Aquaculture, Volume 18, Issue 4, September 2026.
Modern advances in sperm biology highlight the necessity of recognising intra‐ejaculate heterogeneity as a central concept for advancing both the fundamental understanding of fertilisation processes and the development of artificial reproduction techniques in fishes. ABSTRACT Sperm subpopulations represent a fundamental manifestation of intra‐ejaculate
Viktoriya Dzyuba, William V. Holt, Borys Dzyuba   +2 more
wiley   +1 more source

The marine leech Stibarobdella loricata (Harding, 1924) (Hirudinea, Piscicolidae), parasitic on the angel shark Squatina spp. and sandtiger shark Carcharias taurus Rafinesque, 1810 (Chondrichthyes: Squatinidae, Carchariidae) in Southern Brazilian waters

Brazilian Journal of Biology
The presence of the marine leech, Stibarobdella loricata (Harding, 1924) (Hirudinea, Piscicolidae), is reported on the southern coast of Brazil, based on seven lots with 47 specimens, between 71 and 182 mm in total length, collected on the dorsal region ...
J. M. R. Soto
doaj   +1 more source

Micro-computed tomography imaging reveals the development of a unique tooth mineralization pattern in mackerel sharks (Chondrichthyes; Lamniformes) in deep time

Scientific Reports, 2019
The cartilaginous fishes (Chondrichthyes) have a rich fossil record which consists mostly of isolated teeth and, therefore, phylogenetic relationships of extinct taxa are mainly resolved based on dental characters. One character, the tooth histology, has
Patrick L. Jambura, René Kindlimann, Faviel A. López‐Romero, G. Marramà, Cathrin Pfaff, Sebastian Stumpf, Julia Türtscher, C. Underwood, D. Ward, J. Kriwet   +9 more
semanticscholar   +1 more source

Use of nursery areas by the extinct megatooth shark Otodus megalodon (Chondrichthyes: Lamniformes)

Biology Letters, 2020
Nursery areas are fundamental for the success of many marine species, particularly for large, slow-growing taxa with low fecundity and high age of maturity.
J. L. Herraiz, Joan Ribé, H. Botella, C. Martínez‐Pérez, H. Ferrón   +4 more
semanticscholar   +1 more source

Distribution and Characterization of Threatened Common Eagle Ray Aggregations in the Central–Western Mediterranean Sea: Opportunities for Regional Conservation Actions

Aquatic Conservation: Marine and Freshwater Ecosystems, Volume 36, Issue 8, August 2026.
ABSTRACT Many sharks and rays aggregate in critical habitats to migrate, rest, feed, mate or give birth. These predictable events, often involving dozens to thousands of individuals, represent important and vulnerable phases in their life cycles. However, fishing activities and unregulated tourism can threaten these aggregations, disrupting natural ...
Desirée Grancagnolo, Giorgio Aglieri, Carlo Cattano, Chiara Gambardella, Gabriele Turco, Marco Milazzo   +5 more
wiley   +1 more source

Catch Me If You Can: Assessing Sampling Techniques for Threatened Floodplain Wetland Fish

Aquatic Conservation: Marine and Freshwater Ecosystems, Volume 36, Issue 7, July 2026.
ABSTRACT Floodplain wetlands are declining globally in extent and ecological condition. Changing climates, increasing agricultural activity and invasive species are among the key threats contributing to biodiversity loss, with native fish species increasingly in decline and listed as threatened or endangered. Floodplain wetlands present unique sampling
Samuel Lewis, Sally Maxwell, Michael Shackleton, Meaghan L. Rourke, Saúl Gonzalez Murcia, Caitlin Gionfriddo, David Wheeler, Akitomo Kawasaki, Deirdre Hanrahan‐Tan, Dale G. McNeil, Nick R. Bond   +10 more
wiley   +1 more source

Integrating local ecological knowledge, citizen science and long‐term historical data for endangered species conservation: Additional records of angel sharks (Chondrichthyes: Squatinidae) in the Mediterranean Sea

Aquatic conservation, 2019
All three species of angel sharks (genus Squatina) inhabiting the Mediterranean Sea are listed as Critically Endangered in the International Union for Conservation of Nature Red List of Threatened Species due to overexploitation. New records from Cyprus,
I. Giovos, V. Stoilas, Sara A. A. AL-Mabruk, Nikolaos Doumpas, P. Marakis, Mary Maximiadi, Dimitrios K. Moutopoulos, P. Kleitou, I. Keramidas, F. Tiralongo, A. Maddalena   +10 more
semanticscholar   +1 more source