New taxa and cryptic species of neotropical snakes (Xenodontinae), with commentary on hemipenes as generic and specific characters:
Eutrachelophis, new genus is established to accommodate E. bassleri, new species, and E. steinbachi (Boulenger), new combination; a third species close to E. bassleri awaits naming. These taxa are placed in the Eutrachelophiini, new tribe, to express hypothesized relationship with the Xenodontini, w...
Gespeichert in:
| Hauptverfasser: | , |
|---|---|
| Format: | Buch |
| Sprache: | English |
| Veröffentlicht: |
New York, NY
American Museum of Natural History
2014
|
| Schriftenreihe: | Bulletin of the American Museum of Natural History
385 |
| Schlagworte: | |
| Online-Zugang: | Inhaltsverzeichnis |
| Zusammenfassung: | Eutrachelophis, new genus is established to accommodate E. bassleri, new species, and E. steinbachi (Boulenger), new combination; a third species close to E. bassleri awaits naming. These taxa are placed in the Eutrachelophiini, new tribe, to express hypothesized relationship with the Xenodontini, which are defined by presence of hemipenial apical discs (a character lost in several species). The acalyculate spiny hemipenis of Eutrachelophis bassleri is unique among "xenodontines" in having a noncapitate, well-formed capitulum in the form of a nude dome; bifurcation is lacking even in the insertion of the major retractor muscle; the sulcus spermaticus is centrolineal in the retracted organ but becomes centrifugal during eversion. The hemipenis of Eutrachelophis steinbachi is strikingly different in being deeply divided, with long spiny lobes tipped with tufts of sender spines, but it resembles those of some other colubrids (e.g., South American Xenodon suspectus; African Mehelya poensis). Based on hemipenial comparisons, E. bassleri and E. steinbachi seem unlikely congeners. Nonetheless, global comparisons of viscera, head glands, head muscles, color pattern, skull, and dentition indicate that they are congeneric despite hemipenial differences. Neither E. bassleri nor E. steinbachi shows sufficient resemblance to any other "xenodontine" that would suggest an alternative phylogeny. Overall resemblance in so many details, especially of the skull, is not reasonably explained by convergence. Therefore, contrary to dogma, the hemipenes in this case provide no clues to generic affinity. An explanatory hypothesis has Eutrachelophis bassleri and E. steinbachi derived from common stock, but with hemipenial lobes in the bassleri lineage suppressed during embryonic development. It further suggests that the unusual broad, hemispherical nude apex in E. bassleri is homologous wit++ |
| Beschreibung: | Includes bibliographical references (pages 104-112) Snakes and hemipenes |
| Beschreibung: | 112 S. Ill., Kt. 26 cm |
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| 490 | 1 | |a Bulletin of the American Museum of Natural History |v 385 | |
| 500 | |a Includes bibliographical references (pages 104-112) | ||
| 500 | |a Snakes and hemipenes | ||
| 520 | |a Eutrachelophis, new genus is established to accommodate E. bassleri, new species, and E. steinbachi (Boulenger), new combination; a third species close to E. bassleri awaits naming. These taxa are placed in the Eutrachelophiini, new tribe, to express hypothesized relationship with the Xenodontini, which are defined by presence of hemipenial apical discs (a character lost in several species). The acalyculate spiny hemipenis of Eutrachelophis bassleri is unique among "xenodontines" in having a noncapitate, well-formed capitulum in the form of a nude dome; bifurcation is lacking even in the insertion of the major retractor muscle; the sulcus spermaticus is centrolineal in the retracted organ but becomes centrifugal during eversion. The hemipenis of Eutrachelophis steinbachi is strikingly different in being deeply divided, with long spiny lobes tipped with tufts of sender spines, but it resembles those of some other colubrids (e.g., South American Xenodon suspectus; African Mehelya poensis). Based on hemipenial comparisons, E. bassleri and E. steinbachi seem unlikely congeners. Nonetheless, global comparisons of viscera, head glands, head muscles, color pattern, skull, and dentition indicate that they are congeneric despite hemipenial differences. Neither E. bassleri nor E. steinbachi shows sufficient resemblance to any other "xenodontine" that would suggest an alternative phylogeny. Overall resemblance in so many details, especially of the skull, is not reasonably explained by convergence. Therefore, contrary to dogma, the hemipenes in this case provide no clues to generic affinity. An explanatory hypothesis has Eutrachelophis bassleri and E. steinbachi derived from common stock, but with hemipenial lobes in the bassleri lineage suppressed during embryonic development. It further suggests that the unusual broad, hemispherical nude apex in E. bassleri is homologous wit++ | ||
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| 650 | 4 | |a Eutrachelophis steinbachi / Classification | |
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| 650 | 4 | |a Eutrachelophiini / Classification | |
| 650 | 4 | |a Snakes / Generative organs | |
| 650 | 4 | |a Snakes / Classification | |
| 650 | 4 | |a Hemipenis / Anatomy | |
| 650 | 4 | |a Hemipenis / Variation | |
| 650 | 4 | |a Snakes / Classification / South America | |
| 650 | 4 | |a Snakes / Phylogeny / South America | |
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| 830 | 0 | |a Bulletin of the American Museum of Natural History |v 385 |w (DE-604)BV002662991 |9 385 | |
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Datensatz im Suchindex
| _version_ | 1804174826307321856 |
|---|---|
| adam_text | CONTENTS
Abstract...........................................................................
Introduction.......................................................................
Higher-level taxonomy...........................................................
Descriptions of new and reassigned taxa............................................
Eutrachelophiini, new tribe.....................................................
Eutrachelophis, new genus.......................................................
Eutr ache lop his bassleri, new species.........................................
Eutrachelophis, undescribed species.............................................
Eutrachelophis steinbachi (Boulenger), new combination..........................
Global comparisons.................................................................
Viscera.........................................................................
Head glands.....................................................................
Head muscles....................................................................
Skull and dentition.............................................................
Color pattern...................................................................
Hemipenes.......................................................................
Summary of global comparisons...................................................
Discussion.........................................................................
Hypothesis for hemipenial transformation in Eutrachelophis......................
On the apical disc..............................................................
Loss of a “generic character”—the apical disc...................................
Commentary on hemipenes as generic and specific characters.........................
Hemipenial terminology for snakes...............................................
Are hemipenes “conservative” characters?........................................
Examples of intraspecific variation in snake hemipenes and cloacae..............
Evolutionary plasticity and extreme divergence of snake hemipenes...............
Theoretical bases for hemipenial evolution.........................................
Eberhard’s thesis...............................................................
Hox gene expression.............................................................
Taxonomic use of hemipenial data................................................
Conclusions and brief summation ...................................................
Museum abbreviations . , ..........................................................
Acknowledgments....................................................................
Appendix 1: Nomenclatural considerations, by C.W. Myers............................
Notes on the tribe Xenodontini Bonaparte........................................
Color pattern variation ín Xenodon rabdocephalusy sensu lato, with X. suspectus
Cope removed from synonymy....................................................
Lectotype designation for Xenodon rabdocephalus (Wied)..........................
Xenodon angustirostris W. Peters removed from synonymy..........................
Named genera based on loss of the apical disc...................................
Postscript......................................................................
Appendix 2: The Vidian canal and venous foramina in the prootic of alethinophidian
snakes, by SB. McDowell.......................................................
“The Vidian canal”..............................................................
Venous drainage and foramina....................................................
References.........................................................................
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|
| any_adam_object | 1 |
| author | Myers, Charles W. 1936-2018 Macdowell, Samuel B. |
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| discipline | Biologie |
| format | Book |
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| id | DE-604.BV042641851 |
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| indexdate | 2024-07-10T07:06:34Z |
| institution | BVB |
| language | English |
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| publishDate | 2014 |
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| series | Bulletin of the American Museum of Natural History |
| series2 | Bulletin of the American Museum of Natural History |
| spelling | Myers, Charles W. 1936-2018 Verfasser (DE-588)172269253 aut New taxa and cryptic species of neotropical snakes (Xenodontinae), with commentary on hemipenes as generic and specific characters Charles W. Myers ; Samuel B. McDowell Snakes and hemipenes New York, NY American Museum of Natural History 2014 112 S. Ill., Kt. 26 cm txt rdacontent n rdamedia nc rdacarrier Bulletin of the American Museum of Natural History 385 Includes bibliographical references (pages 104-112) Eutrachelophis, new genus is established to accommodate E. bassleri, new species, and E. steinbachi (Boulenger), new combination; a third species close to E. bassleri awaits naming. These taxa are placed in the Eutrachelophiini, new tribe, to express hypothesized relationship with the Xenodontini, which are defined by presence of hemipenial apical discs (a character lost in several species). The acalyculate spiny hemipenis of Eutrachelophis bassleri is unique among "xenodontines" in having a noncapitate, well-formed capitulum in the form of a nude dome; bifurcation is lacking even in the insertion of the major retractor muscle; the sulcus spermaticus is centrolineal in the retracted organ but becomes centrifugal during eversion. The hemipenis of Eutrachelophis steinbachi is strikingly different in being deeply divided, with long spiny lobes tipped with tufts of sender spines, but it resembles those of some other colubrids (e.g., South American Xenodon suspectus; African Mehelya poensis). Based on hemipenial comparisons, E. bassleri and E. steinbachi seem unlikely congeners. Nonetheless, global comparisons of viscera, head glands, head muscles, color pattern, skull, and dentition indicate that they are congeneric despite hemipenial differences. Neither E. bassleri nor E. steinbachi shows sufficient resemblance to any other "xenodontine" that would suggest an alternative phylogeny. Overall resemblance in so many details, especially of the skull, is not reasonably explained by convergence. Therefore, contrary to dogma, the hemipenes in this case provide no clues to generic affinity. An explanatory hypothesis has Eutrachelophis bassleri and E. steinbachi derived from common stock, but with hemipenial lobes in the bassleri lineage suppressed during embryonic development. It further suggests that the unusual broad, hemispherical nude apex in E. bassleri is homologous wit++ Eutrachelophis bassleri / Classification Eutrachelophis steinbachi / Classification Eutrachelophis / Classification Eutrachelophis / Anatomy Eutrachelophiini / Classification Snakes / Generative organs Snakes / Classification Hemipenis / Anatomy Hemipenis / Variation Snakes / Classification / South America Snakes / Phylogeny / South America Hemipenis (DE-588)4577582-5 gnd rswk-swf Ungleichzähnige Nattern (DE-588)4577584-9 gnd rswk-swf Neotropische Region (DE-588)4122707-4 gnd rswk-swf Neotropische Region (DE-588)4122707-4 g Ungleichzähnige Nattern (DE-588)4577584-9 s Hemipenis (DE-588)4577582-5 s b DE-604 Macdowell, Samuel B. Verfasser aut Bulletin of the American Museum of Natural History 385 (DE-604)BV002662991 385 Digitalisierung UB Regensburg - ADAM Catalogue Enrichment application/pdf http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=028074214&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA Inhaltsverzeichnis |
| spellingShingle | Myers, Charles W. 1936-2018 Macdowell, Samuel B. New taxa and cryptic species of neotropical snakes (Xenodontinae), with commentary on hemipenes as generic and specific characters Bulletin of the American Museum of Natural History Eutrachelophis bassleri / Classification Eutrachelophis steinbachi / Classification Eutrachelophis / Classification Eutrachelophis / Anatomy Eutrachelophiini / Classification Snakes / Generative organs Snakes / Classification Hemipenis / Anatomy Hemipenis / Variation Snakes / Classification / South America Snakes / Phylogeny / South America Hemipenis (DE-588)4577582-5 gnd Ungleichzähnige Nattern (DE-588)4577584-9 gnd |
| subject_GND | (DE-588)4577582-5 (DE-588)4577584-9 (DE-588)4122707-4 |
| title | New taxa and cryptic species of neotropical snakes (Xenodontinae), with commentary on hemipenes as generic and specific characters |
| title_alt | Snakes and hemipenes |
| title_auth | New taxa and cryptic species of neotropical snakes (Xenodontinae), with commentary on hemipenes as generic and specific characters |
| title_exact_search | New taxa and cryptic species of neotropical snakes (Xenodontinae), with commentary on hemipenes as generic and specific characters |
| title_full | New taxa and cryptic species of neotropical snakes (Xenodontinae), with commentary on hemipenes as generic and specific characters Charles W. Myers ; Samuel B. McDowell |
| title_fullStr | New taxa and cryptic species of neotropical snakes (Xenodontinae), with commentary on hemipenes as generic and specific characters Charles W. Myers ; Samuel B. McDowell |
| title_full_unstemmed | New taxa and cryptic species of neotropical snakes (Xenodontinae), with commentary on hemipenes as generic and specific characters Charles W. Myers ; Samuel B. McDowell |
| title_short | New taxa and cryptic species of neotropical snakes (Xenodontinae), with commentary on hemipenes as generic and specific characters |
| title_sort | new taxa and cryptic species of neotropical snakes xenodontinae with commentary on hemipenes as generic and specific characters |
| topic | Eutrachelophis bassleri / Classification Eutrachelophis steinbachi / Classification Eutrachelophis / Classification Eutrachelophis / Anatomy Eutrachelophiini / Classification Snakes / Generative organs Snakes / Classification Hemipenis / Anatomy Hemipenis / Variation Snakes / Classification / South America Snakes / Phylogeny / South America Hemipenis (DE-588)4577582-5 gnd Ungleichzähnige Nattern (DE-588)4577584-9 gnd |
| topic_facet | Eutrachelophis bassleri / Classification Eutrachelophis steinbachi / Classification Eutrachelophis / Classification Eutrachelophis / Anatomy Eutrachelophiini / Classification Snakes / Generative organs Snakes / Classification Hemipenis / Anatomy Hemipenis / Variation Snakes / Classification / South America Snakes / Phylogeny / South America Hemipenis Ungleichzähnige Nattern Neotropische Region |
| url | http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&local_base=BVB01&doc_number=028074214&sequence=000002&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA |
| volume_link | (DE-604)BV002662991 |
| work_keys_str_mv | AT myerscharlesw newtaxaandcrypticspeciesofneotropicalsnakesxenodontinaewithcommentaryonhemipenesasgenericandspecificcharacters AT macdowellsamuelb newtaxaandcrypticspeciesofneotropicalsnakesxenodontinaewithcommentaryonhemipenesasgenericandspecificcharacters AT myerscharlesw snakesandhemipenes AT macdowellsamuelb snakesandhemipenes |