A New Stomiatoid Fish from California

Bolin, Rolf L.

doi:10.2307/1436014

Cited by 5 publications

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“…In fact, the loss of pectoral fins independently from the pelvic fins is only observed in some Stomiidae (Stomiiformes) and Pleuronectiformes. In stomiiform genera where this condition is observed, pectoral fins are present in larvae but are subsequently lost in juveniles and adults [ 140 – 145 ]. In Pleuronectiformes, some species lose their pectoral fins on a single side, while other species lose their pectoral fins on both sides; as with Stomiiformes, this loss takes place during larval metamorphosis [ 146 ].…”

Section: Discussionmentioning

confidence: 99%

Fin modules: an evolutionary perspective on appendage disparity in basal vertebrates

2017

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BackgroundFishes are extremely speciose and also highly disparate in their fin configurations, more specifically in the number of fins present as well as their structure, shape, and size. How they achieved this remarkable disparity is difficult to explain in the absence of any comprehensive overview of the evolutionary history of fish appendages. Fin modularity could provide an explanation for both the observed disparity in fin configurations and the sequential appearance of new fins. Modularity is considered as an important prerequisite for the evolvability of living systems, enabling individual modules to be optimized without interfering with others. Similarities in developmental patterns between some of the fins already suggest that they form developmental modules during ontogeny. At a macroevolutionary scale, these developmental modules could act as evolutionary units of change and contribute to the disparity in fin configurations. This study addresses fin disparity in a phylogenetic perspective, while focusing on the presence/absence and number of each of the median and paired fins.ResultsPatterns of fin morphological disparity were assessed by mapping fin characters on a new phylogenetic supertree of fish orders. Among agnathans, disparity in fin configurations results from the sequential appearance of novel fins forming various combinations. Both median and paired fins would have appeared first as elongated ribbon-like structures, which were the precursors for more constricted appendages. Among chondrichthyans, disparity in fin configurations relates mostly to median fin losses. Among actinopterygians, fin disparity involves fin losses, the addition of novel fins (e.g., the adipose fin), and coordinated duplications of the dorsal and anal fins. Furthermore, some pairs of fins, notably the dorsal/anal and pectoral/pelvic fins, show non-independence in their character distribution, supporting expectations based on developmental and morphological evidence that these fin pairs form evolutionary modules.ConclusionsOur results suggest that the pectoral/pelvic fins and the dorsal/anal fins form two distinct evolutionary modules, and that the latter is nested within a more inclusive median fins module. Because the modularity hypotheses that we are testing are also supported by developmental and variational data, this constitutes a striking example linking developmental, variational, and evolutionary modules.Electronic supplementary materialThe online version of this article (doi:10.1186/s12915-017-0370-x) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 99%

Fin modules: an evolutionary perspective on appendage disparity in basal vertebrates

2017

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“…and Tactostoma (Bolin, 1939;Fink, 1985;Goodyear & Gibbs, 1986;Hulley, 1986;Kawaguchi & Moser, 1984;Kenaley & Hartel, 2005). In these genera, paddle-shaped pectoral fins are present in larvae and are gradually lost during metamorphosis (Kawaguchi & Moser, 1984;Kenaley & Hartel, 2005).…”

Section: Euteleostei (Argentiniformes Salmoniformes and Osmeriformes)mentioning

confidence: 99%

A critical appraisal of appendage disparity and homology in fishes

2019

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Fishes are both extremely diverse and morphologically disparate. Part of this disparity can be observed in the numerous possible fin configurations that may differ in terms of the number of fins as well as fin shapes, sizes and relative positions on the body. Here, we thoroughly review the major patterns of disparity in fin configurations for each major group of fishes and discuss how median and paired fin homologies have been interpreted over time. When taking into account the entire span of fish diversity, including both extant and fossil taxa, the disparity in fin morphologies greatly complicates inferring homologies for individual fins. Given the phylogenetic scope of this review, structural and topological criteria appear to be the most useful indicators of fin identity. We further suggest that it may be advantageous to consider some of these fin homologies as nested within the larger framework of homologous fin‐forming morphogenetic fields. We also discuss scenarios of appendage evolution and suggest that modularity may have played a key role in appendage disparification. Fin modules re‐expressed within the boundaries of fin‐forming fields could explain how some fins may have evolved numerous times independently in separate lineages (e.g., adipose fin), or how new fins may have evolved over time (e.g., anterior and posterior dorsal fins, pectoral and pelvic fins). We favour an evolutionary scenario whereby median appendages appeared from a unique field of competence first positioned throughout the dorsal and ventral midlines, which was then redeployed laterally leading to paired appendages.

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“…The postorbital is definitely under the control of the fish, can be rolled down out of sight, and made to glow steadily or emit sharp flashes of a different color, at least in Echiostoma. In the new Tactostoma Bolin, 1939, it apparently rotates forward, or forward and downward, instead of the usual downward. The following summary has been made of observations on this organ from the Bathysphere: â€oeThe cheek lights seemed under control, and were seen occasionally to blink.…”

Section: Table Imentioning

confidence: 93%

Deep-Sea Fishes of the Bermuda Oceanographic Expeditions. Family Melanostomiatidae

Bolin¹,

Beebe²,

Crane³

1939

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Genus Bathophilus Giglioli 196 B. brevis Regan & Trewavas 199 B. altipinnis Beebe 203 B. metallicus (Welsh) 205 B. longipinnis (Pappenheim) 208 B. chironema Regan & Trewavas 209 Genus Eustomias Vaillant 210 E. obscurus Vaillant 217 E. bibulbosus Parr 219 E. simplex Regan & Trewavas 221 E. dubius Parr 222 E. lipochirus Regan & Trewavas 224 E. bigelowi Welsh 225 E. silvescens Regan & Trewavas 228 E. schmidti Regan & Trewavas 230 E. fissibarbis Pappenheim 232 IV. Bibliography 233 Introduction.For detailed data in regard to nets, locality, dates, etc., concerning the capture of the deep-sea fishes treated in this monograph, refer to Zoologica,

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A New Stomiatoid Fish from California

Cited by 5 publications

References 0 publications

Fin modules: an evolutionary perspective on appendage disparity in basal vertebrates

Fin modules: an evolutionary perspective on appendage disparity in basal vertebrates

A critical appraisal of appendage disparity and homology in fishes

Deep-Sea Fishes of the Bermuda Oceanographic Expeditions. Family Melanostomiatidae

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