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AN INVESTIGATION INTO THE NATURE OF ANAL FIN GLANDS IN FISHES OF THE FAMILY BLENNIIDAE
Title
AN INVESTIGATION INTO THE NATURE OF ANAL FIN GLANDS IN FISHES OF THE FAMILY BLENNIIDAE.
Creator
Porter, Marianne C., Florida Atlantic University
Abstract/Description
Sexually active males of the family Blenniidae develop distinctive glandular swellings of the anal fins. These glands can be divided into four groups on the basis of their shape and whether they appear on the anal fin spines or rays or both. Examples of each group, when studied microscopically, show the same histological pattern. This pattern includes three layers of tissue, the outermost of which contains characteristic barrel-shaped groupings of cells called "microglands". These anal fin...
Show moreSexually active males of the family Blenniidae develop distinctive glandular swellings of the anal fins. These glands can be divided into four groups on the basis of their shape and whether they appear on the anal fin spines or rays or both. Examples of each group, when studied microscopically, show the same histological pattern. This pattern includes three layers of tissue, the outermost of which contains characteristic barrel-shaped groupings of cells called "microglands". These anal fin glands are compared histologically to similar structures on the dorsal fins of some blenniids and the anal fins of certain clinids. The microscopic structure of the anal fin glands is distinctive and characteristic.
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Date Issued
1979
PURL
http://purl.flvc.org/fcla/dt/13962
Subject Headings
Blenniidae, Fins (Anatomy)
Format
Document (PDF)
First North American continental record of the longfin mako (Isurus paucus Guitart Manday)
Title
First North American continental record of the longfin mako (Isurus paucus Guitart Manday).
Creator
Dodrill, Jon W., Gilmore, R. G., Harbor Branch Oceanographic Institute
Date Issued
1979
PURL
http://purl.flvc.org/FCLA/DT/3174424
Subject Headings
Mako sharks, Isurus paucus, Pelagic fishes, Fins (Anatomy), Species
Format
Document (PDF)
Pelvic fin locomotion in batoids
Title
Pelvic fin locomotion in batoids.
Creator
Macesic, Laura Jane., Charles E. Schmidt College of Science, Department of Biological Sciences
Abstract/Description
Although most batoids (skates and rays) are benthic, only the skates (Rajidae) have been described as performing benthic locomotion, termed 'punting'. While keeping the rest of the body motionless, the skate's specialized pelvic fins are planted into the substrate and then retracted caudally, which thrusts the body forward. This may be advantageous for locating and feeding on prey, avoiding predators, and reducing energetic costs. By integrating kinematic, musculoskeletal, material properties...
Show moreAlthough most batoids (skates and rays) are benthic, only the skates (Rajidae) have been described as performing benthic locomotion, termed 'punting'. While keeping the rest of the body motionless, the skate's specialized pelvic fins are planted into the substrate and then retracted caudally, which thrusts the body forward. This may be advantageous for locating and feeding on prey, avoiding predators, and reducing energetic costs. By integrating kinematic, musculoskeletal, material properties, and compositional analyses across a range of morphologically and phylogenetically diverse batoids, this dissertation (i) demonstrates that punting is not confined to the skates, and (ii) provides reliable anatomical and mechanical predictors of punting ability. Batoids in this study performed true punting (employing only pelvic fins), or augmented punting (employing pectoral and pelvic fins). Despite the additional thrust from the pectoral fins, augmented punters failed to exceed the punting c apabilities of the true punters. True punters' pelvic fins had greater surface area and more specialized and robust musculature compared to the augmented punters' fins. The flexural stiffness of the main skeletal element used in punting, the propterygium, correlated with punting ability (3.37 x 10-5 - 1.80 x 10-4 Nm2). Variation was due to differences in mineral content (24.4-48-9% dry mass), and thus, material stiffness (140-2533 MPa), and second moment of area. The propterygium's radius-to-thickness ratio (mean = 5.52 +-0.441 SE) indicated that the propterygium would support true and augmented punters, but not non-punters, in an aquatic environment. All propterygia would fail on land. Geometric and linear morphometric analyses of 61 batoid pelvic girdles demonstrated that pelvic girdle shape can predict punting and swimming ability and taxonomic attribution to Order., Characteristics of true punters' pelvic girdles, such as laterally facing fin articulations, large surface area formuscle attachment, and tall lateral pelvic processes are similar to characteristics of early sprawled-gait tetrapods' pelvic girdles. This dissertation demonstrates that punting is common in batoids, illustrates the convergent evolution of true punter and early tetrapod pelvic anatomy, and gives possible explanations for the restriction of elasmobranchs to aquatic habitats.
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Date Issued
2011
PURL
http://purl.flvc.org/FAU/3171678
Subject Headings
Sharks, Ecology, Fins, Anatomy, Adaptation (Biology), Aquatic animals, Physiology, Fishes, Locomotion
Format
Document (PDF)