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Narrow-bridged musk turtle

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Species of turtle in the family Kinosternidae

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Narrow-bridged musk turtle

Claudius angustatus in an aquarium
Conservation status
Near Threatened (IUCN 2.3)^[1]
CITES Appendix II ^[2]
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Testudines
Suborder:	Cryptodira
Family:	Kinosternidae
Subfamily:	Staurotypinae
Genus:	Claudius Cope, 1865
Species:	C. angustatus
Binomial name
*Claudius angustatus* Cope, 1865^[1]
Synonyms^[3]
Claudius angustatus Cope, 1865 Claudius megalocephalus Bocourt, 1868 Claudius macrocephalus Gray, 1868(ex errore) Claudius megacephalus Boulenger, 1889(ex errore) Claudias angustatus —Velasco, 1892 Claudius agassizii H.M. Smith &Taylor, 1950 (nomen nudum) Claudius angustatum —Sullivan &Riggs, 1967

Thenarrow-bridged musk turtle (Claudius angustatus) is aspecies ofturtle in thefamily Kinosternidae. The species is found inCentral America andMexico.

Geographic range

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C. angustatus is found inMexico,Guatemala, andBelize.^[1]

Taxonomy

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As of 2010,C. angustatus is the only recognizedextant species in thegenusClaudius.^[1]

Description

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The narrow-bridged musk turtle is typically brown in color. Thescutes of thecarapace have lines and graining, imparting an almost wood-like appearance. It often has bright-yellow markings on the edges of the carapace. As it ages,algae often heavily cover the shell, masking the patterning and coloration. The head is large and bulbous for its size, with a sharp beak and a long neck. The jaw joint anatomy of the narrow-bridged musk turtle is unique among modernCryptodira.^[4] In most cryptodires the jaw joint is formed by a biconcave facet. In the narrow-bridged musk turtle, the jaw joint of is formed by a broad hemispherical condyle, more akin toPleurodira.The carapace isdomed, with three distinct ridges down the length. Though classified in thesubfamily Staurotypinae with the "giant" musk turtles, the narrow-bridged musk turtle generally only grows to a straight carapace length of about 6.5 in (16.5 cm).^{[citation needed]}

The narrow-bridged musk turtle exhibits genetic sex determination, in contrast to most turtles; although the mechanism is not known for certain, it is suspected to beXX/XY like that of its relativeStaurotypus.^[5]^[6]

Behavior, habitat, and diet

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Like all musk turtles, the narrow-bridged musk turtle is almost entirely aquatic, and prefershabitats such as slow-moving creeks, or shallow ponds that are heavily vegetated. It spends much of its time walking along the bottom,foraging for aquaticinsects and otherinvertebrates, andcarrion. It has glands under the rear of theshell from which it can release a foul-smellingmusk, hence its common name.^{[citation needed]}

References

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^^a ^b ^c ^dRhodin, Anders G.J.; van Dijk, Peter Paul; Iverson, John B.; Shaffer, H. Bradley (2010-12-14)."Turtles of the world, 2010 update: Annotated checklist of taxonomy, synonymy, distribution and conservation status"(PDF).Chelonian Research Monographs.5:000.85 –000.164.doi:10.3854/crm.5.000.checklist.v3.2010.ISBN 978-0-9653540-9-7. Archived fromthe original(PDF) on 2011-07-17.
^"Appendices | CITES".cites.org. Retrieved2023-03-01.
^Fritz Uwe; Havaš, Peter (2007)."Checklist of Chelonians of the World".Vertebrate Zoology.57 (2):249–250.doi:10.3897/vz.57.e30895.ISSN 1864-5755.S2CID 87809001.
^Evers, Serjoscha W.; Ponstein, Jasper; Jansen, Maren A.; Gray, Jaimi A.; Fröbisch, Jörg (2022)."A systematic compendium of turtle mandibular anatomy using digital dissections of soft tissue and osteology".The Anatomical Record.306 (6):1228–1303.doi:10.1002/ar.25037.PMID 35900121.
^Badenhorst, Daleen; Stanyon, Roscoe; Engstrom, Tag; Valenzuela, Nicole (2013-04-01). "A ZZ/ZW microchromosome system in the spiny softshell turtle, Apalone spinifera, reveals an intriguing sex chromosome conservation in Trionychidae".Chromosome Research.21 (2):137–147.doi:10.1007/s10577-013-9343-2.ISSN 1573-6849.PMID 23512312.S2CID 14434440.
^Kawagoshi, Taiki; Uno, Yoshinobu; Nishida, Chizuko; Matsuda, Yoichi (2014-08-14)."The Staurotypus Turtles and Aves Share the Same Origin of Sex Chromosomes but Evolved Different Types of Heterogametic Sex Determination".PLOS ONE.9 (8) e105315.Bibcode:2014PLoSO...9j5315K.doi:10.1371/journal.pone.0105315.ISSN 1932-6203.PMC 4133349.PMID 25121779.

External links

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Boulenger GA (1889).Catalogue of the Chelonians, Rhynchocephalians, and Crocodiles in the British Museum (Natural History). New Edition. London: Trustees of the British Museum (Natural History). (Taylor and Francis, printers). x + 311 pp. + Plates I-III. (GenusClaudius, p. 32; speciesC. angustatus, p. 33).
Cope ED (1865). "Third contribution to the HERPETOLOGY of Tropical America".Proc. Acad. Nat. Sci. Philadelphia17: 185–198. (Claudius angustatus, new species, pp. 187–188).
Goin CJ,Goin OB,Zug GR (1978).Introduction to Herpetology, Third Edition. San Francisco: W.H. Freeman and Company. xi + 378 pp.ISBN 0-7167-0020-4. (GenusClaudius, p. 264).

Kinosternidae family

Kingdom:Animalia
Phylum:Chordata
Class:Reptilia
Subclass:Anapsida
Order:Testudines
Suborder:Cryptodira
Superfamily:Kinosternoidea
Family:Kinosternidae

Genera

Species of theKinosternidae family

Claudius

Narrow-bridged musk turtle

†Hoplochelys

†Hoplochelys clark

Kinosternon

Sternotherus

Staurotypus

Phylogenetic arrangement of turtles based onturtles of the world 2017 update: Annotated checklist and atlas of taxonomy, synonymy, distribution, and conservation status. Key: †=extinct.

Testudines

Kingdom:Animalia
Phylum:Chordata
Class:Reptilia
Clade:Diapsida
Order:Testudines

Genus

Chelonioidea
(Sea turtles)

Cheloniidae	†Allopleuron Caretta †Carolinochelys Chelonia †Eochelone Eretmochelys †Gigantatypus †Glarichelys †Itilochelys Lepidochelys †Mexichelys †Miocaretta Natator †Pacifichelys †Syllomus †Tasbacka
Dermochelyidae	†Arabemys †Corsochelys †Cosmochelys Dermochelys †Eosphargis †Mesodermochelys †Psephophorus
	†Euclastes †Peritresius †Procolpochelys †Protosphargis †Puppigerus

Kinosternoidea

Dermatemydidae	Dermatemys
Kinosternidae	Claudius †Hoplochelys Kinosternon Staurotypus Sternotherus

Testudinoidea

Emydidae	†Acherontemys Chrysemys Clemmys Deirochelys Emys Actinemys Emydoidea Glyptemys Graptemys Malaclemys Pseudemys Terrapene Trachemys †Wilburemys
Geoemydidae	Batagur †Banhxeochelys Cuora Cyclemys Geoclemys Geoemyda Hardella Heosemys Leucocephalon Malayemys Mauremys Melanochelys Morenia Notochelys Orlitia Pangshura Rhinoclemmys Sacalia Siebenrockiella Vijayachelys
Platysternidae	Platysternon
Testudinidae	Aldabrachelys Astrochelys Centrochelys Chelonoidis Chersina Cylindraspis †Cymatholcus †Floridemys Geochelone Gopherus †Hadrianus †Hesperotestudo Homopus Indotestudo Kinixys Malacochersus Manouria †Megalochelys †Oligopherus Psammobates Pyxis †Solitudo Stigmochelys †Stylemys Testudo

Trionychia

Carettochelyidae	†Allaeochelys †Anosteira Carettochelys
Trionychidae	Amyda Apalone †Axestemys Chitra Cyclanorbis Cycloderma †Drazinderetes Dogania †Gilmoremys †Hutchemys †Khunnuchelys Lissemys Nilssonia Palea †Palaeoamyda Pelochelys Pelodiscus Rafetus Trionyx
	†Basilochelys †Sinaspideretes

Chelydridae	Chelydra †Chelydrops †Chelydropsis †Emarginachelys †Macrocephalochelys Macrochelys †Planiplastron †Protochelydra
†Nanhsiungchelyidae	†Anomalochelys †Basilemys †Jiangxichelys
†Protostegidae	†Alienochelys †Archelon †Atlantochelys †Bouliachelys †Calcarichelys †Cratochelone †Desmatochelys †Iserosaurus †Notochelone †Ocepechelon †Pneumatoarthrus †Protostega †Rhinochelys †Santanachelys †Terlinguachelys
	†Adocus †Argillochelys †Bashuchelys †Ctenochelys †Prionochelys †Toxochelys

Pleurodira

†Araripemydidae	†Araripemys
†Bothremydidae	†Araiochelys †Arenila †Azabbaremys †Bothremys †Cearachelys †Chedighaii †Chupacabrachelys †Eotaphrosphys †Foxemys †Galianemys †Ilatardia †Inaechelys †Itapecuruemys †Jainemys †Kinkonychelys †Kurmademys †Labrostochelys †Nigeremys †Phosphatochelys †Polysternon †Puentemys †Rosasia †Rhothonemys †Sankuchemys †Taphrosphys †Ummulisani †Zolhafah
Chelidae	Acanthochelys Chelodina Chelus Elseya Elusor Emydura Hydromedusa †Lomalatachelys Mesoclemmys Myuchelys Phrynops Platemys †Prochelidella Pseudemydura Rheodytes Rhinemys †Yaminuechelys
Pelomedusidae	Pelomedusa Pelusios
Podocnemididae	†Albertwoodemys †Bauruemys †Brontochelys †Caninemys †Carbonemys †Cerrejonemys †Cordichelys Erymnochelys †Lapparentemys †Latentemys Peltocephalus Podocnemis †Stupendemys
†Sahonachelyidae	†Sahonachelys †Sokatra

	†Caribemys †Caririemys †Tacuarembemys

Phylogenetic arrangement of turtles based onTurtles of the World 2017 Update: Annotated Checklist and Atlas of Taxonomy, Synonymy, Distribution, and Conservation Status. † = extinct.

See alsoList of Testudines families

Taxon identifiers
Claudius angustatus	Wikidata:Q1088098 Wikispecies:Claudius angustatus ADW:Claudius BOLD:253620 CoL:VTHZ EoL:795375 GBIF:5220399 iNaturalist:39701 IRMNG:10894640 ITIS:551948 IUCN:4959 NCBI:904233 Open Tree of Life:469679 Paleobiology Database:172718 RD:angustatus