Marine records of the Nile soft-shelled turtle, Trionyx triunguis from Turkey

Taşkavak, Ertan; Akçınar, Salim Can

doi:10.1017/s1755267208000092

Cited by 19 publications

(9 citation statements)

References 5 publications

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“…In this area, a significant amount of Neogene-Quaternary deposits occur, with many important fossil mammal localities of Late Miocene age (Koufos 2006). Similar continental deposits have been found further to the south in the eastern part of the Thermaikos Gulf, the western Chalkidiki deposits (Syrides 1990). These two areas are the present-day remnants of a broader basin, the Axios-Thermaikos basin, which existed during Neogene.…”

Section: Geological Settingsupporting

confidence: 70%

The first record of a soft-shelled turtle (Testudines: Pan-Trionychidae) from southern Balkans (Pliocene, Gefira, N. Greece) and new information from bone histology

Vlachos

Cerda

Tsoukala

2015

Sci Nat

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Soft-shelled turtles (Pan-Trionychidae) are not included in the present-day chelonian fauna of Greece and have been unknown in the Greek fossil record up to now. Here, we report the first fossil occurrence of a soft-shelled turtle from Greece, originating from the Pliocene Gefira Member (Angelochori Formation), in the lower Axios valley. The corresponding specimens were discovered with several mammalian remains, most of them attributable to the mastodon of Auvergne, Anancus arvernensis. The chelonian material includes five carapacial fragments that belong to the same individual and can be attributed to Pan-Trionychidae based on the typical sculpturing on the dorsal side of the carapace. Most of these bony plates were histologically sampled and thereby provide evidence for the "plywood" structure, another characteristic of pan-trionychids. They represent the first extended sampling of trionychid plates that belong to the same individual, allowing the documentation of the variation of the relevant trionychid morphologies in the carapace. These findings expand the paleobiogeographic range of this taxon to the southern Balkans and Greece and allow a better estimation of the chelonian paleo-fauna of the area. They are also important for the temporal distribution of this clade in the Paleoarctic, as they join specimens from Italy as being the last trionychids in Europe.

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Section: Geological Settingsupporting

confidence: 70%

The first record of a soft-shelled turtle (Testudines: Pan-Trionychidae) from southern Balkans (Pliocene, Gefira, N. Greece) and new information from bone histology

Vlachos

Cerda

Tsoukala

2015

Sci Nat

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“…This clade has no extant representatives in the Mediterranean islands, although living individuals of Trionyx triunguis have been repeatedly reported from the Dodecanese Islands in Greece, specifically Kos, Symi, Leros, Kalymnos and Rhodes, some kilometers away from the southwestern coast of Asia Minor (Corsini-Foka and Masseti, 2008). However, these sightings of living individuals of T. triunguis should be better considered as random cases of marine dispersals across narrow straights of the Aegean Sea, as this species has been well documented to swim at certain marine distances from the coast (Taskavak et al, 1999). Nevertheless, most fossil finds from this region are rather fragmentary, hindering the exact taxonomic affinities of the Mediterranean Islands pan-trionychids.…”

Section: Trionychids From the Mediterranean Islandsmentioning

confidence: 99%

A revision of the trionychid turtle Procyclanorbis sardus Portis, 1901 from the late Miocene of Sardinia (Italy)

Georgalis

Zoboli

Pillola

et al. 2017

Annales de Paléontologie

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“…Recent studies conducted on this species include population size and structure (Akçınar and Taşkavak, 2017), molecular genetics (Güçlü et al, 2009;Güçlü, et al, 2011;Shanas et al, 2012), review of marine records (Taşkavak and Akçınar, 2009), and assessment of mite infestations in nests (Katılmış and Urhan, 2007). There are also some studies on the International Union for Conservation of Nature (IUCN) assessment of the Mediterranean population of the Nile softshell turtle which is threatened at international and national scales (van Dijk et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

The Nile Softshell Turtle (Trionyx triunguis): Nest Parameters and A New Nesting Site

Candan

2018

Süleyman Demirel Üniversitesi Eğirdir Su Ürünleri Fakültesi Dergisi

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There are no studies carried out on nest parameters of the Nile softshell turtle (Trionyx triunguis) in Turkey except for few studies on the Western Mediterranean coast of Turkey. In this study, 12 nests of the Nile softshell turtle were examined in terms of nest parameters during 2016 and 2017 nesting seasons on Belek, Göksu, and Burnaz beaches located on the Central and Eastern Mediterranean coast of Turkey. Nesting period started in May (17%) but intensified in June (83%). The distance of nests to the shore, depth of nests, clutch temperature, clutch size, and hatching success in the nests were recorded and calculated. Among three beaches, the lowest hatching success rate was on Göksu Beach (0.18 ± 0.26), whereas the values were similar on Belek (0.75 ± 0.22) and Burnaz (0.72 ± 0.36) beaches. Although clutch temperatures were measured in a range (29.5-33.0 °C) that is optimal for embryo development, most of the eggs inside nests were dead at the late embryonic period (5.1 ± 9.6) which was followed by early (1.8 ± 3.1) and middle stage embryos (0.3 ± 0,6). The highest number of unfertilized eggs was recorded on Burnaz Beach (14.5 ± 19.1) and the lowest was on Belek Beach (1.0 ± 1.5). Regarding the relationship between the nest parameters, it was detected that only the clutch temperature has a significant relationship with the clutch size. In this study, a new nesting site for the softshell Nile turtle on Burnaz Beach was discovered and nest parameters in this species were indicated on three beaches.

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Marine records of the Nile soft-shelled turtle, Trionyx triunguis from Turkey

Cited by 19 publications

References 5 publications

The first record of a soft-shelled turtle (Testudines: Pan-Trionychidae) from southern Balkans (Pliocene, Gefira, N. Greece) and new information from bone histology

The first record of a soft-shelled turtle (Testudines: Pan-Trionychidae) from southern Balkans (Pliocene, Gefira, N. Greece) and new information from bone histology

A revision of the trionychid turtle Procyclanorbis sardus Portis, 1901 from the late Miocene of Sardinia (Italy)

The Nile Softshell Turtle (Trionyx triunguis): Nest Parameters and A New Nesting Site

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