Trapezidens dolichorhynchus ( Tapparone-Canefri, 1889 )

Konopleva, Ekaterina S., Bolotov, Ivan N., Kondakov, Alexander V., Kononov, Oleg D., Gofarov, Mikhail Yu., Tomilova, Alena A., Lunn, Zau, Chan, Nyein, Win, Than & Vikhrev, Ilya V., 2020, A taxonomic review of Trapezidens (Bivalvia: Unionidae: Lamellidentini), a freshwater mussel genus endemic to Myanmar, with a description of a new species, Ecologica Montenegrina 27, pp. 45-57 : 52-53

publication ID

https://doi.org/ 10.37828/em.2020.27.6

publication LSID

urn:lsid:zoobank.org:pub:DCB77D14-C674-469C-B4EF-6020AF6FA8CA

persistent identifier

https://treatment.plazi.org/id/CE0F87D4-FF80-FFEE-F184-46DB598E83BF

treatment provided by

Felipe

scientific name

Trapezidens dolichorhynchus ( Tapparone-Canefri, 1889 )
status

 

Trapezidens dolichorhynchus ( Tapparone-Canefri, 1889) View in CoL

Fig. 3b View Figure 3

= Unio marginalis var. obesa Hanley & Theobald (1876): 20 View in CoL , Pl. 43, Fig. 3 View Figure 3 . Type locality: River Iriwadi, Birmah. Primary homonym of Unio obesus Lea, 1831 View in CoL . Type: Holotype BMNH_ 1907-12-30 -46 [by monotypy]; Natural History Museum, London, UK (examined by us).

= Unio dolichorhynchus Tapparone-Canefri (1889): 348 View in CoL . Type locality: Mercato di Mandalay [Mandalay market]. Types: Whereabouts unknown, but probably in ZSI ( Prashad 1922).

= Unio scutum var. humilior Martens (1899): 45 View in CoL , Pl. 5, Fig. 1 View Figure 1 . Type locality: Irawaddi, bei Yenangyoung. Type: Holotype ZMB_49639; Museum für Naturkunde, Berlin, Germany (examined by us). Paratype: SMF 3625 (Chindwin bei Kalewa, O. Birmah. H. Rolle); Naturmuseum Senckenberg, Frankfurt, Germany (examined by us).

= Trapezidens obesa obesa ( Hanley & Theobald, 1876) View in CoL . – Bolotov et al. (2017b): 10.

= Unio protensus Tapparone-Canefri (1889): 349 View in CoL . Type locality: Prome, Bassa Birmania [Irrawaddy near Pyay city, approx. 18.8387°N, 95.2206°E]. Primary homonym of Unio protensus Lea, 1865 View in CoL ; renamed Lamellidens canefrianus Simpson, 1900 View in CoL . Types: Whereabouts unknown, but probably in ZSI ( Prashad 1922).

= Lamellidens canefrianus Simpson (1900): 857 View in CoL . Type locality: Prome, Lower Burma [Irrawaddy near Pyay city, approx. 18.8387°N, 95.2206°E]. Replacement name for Unio protensus Tapparone-Canefri, 1889 View in CoL .

= Unio protensus var. ellipticus Tapparone-Canefri (1889): 350 View in CoL . Type locality: Prome, Bassa Birmania [Irrawaddy near Pyay city, approx. 18.8387°N, 95.2206°E]. Primary homonym of Unio elliptica Rafinesque, 1820 View in CoL . Types: Whereabouts unknown, but probably in ZSI ( Prashad 1922).

= Unio gianellii Tapparone-Canefri (1889): 353 View in CoL . Type locality: Mercato di Mandalay [Mandalay market]. Types: Whereabouts unknown, but probably in ZSI ( Prashad 1922).

Topotypes examined. MYANMAR: Ayeyarwady River near Tant Kyi village , 21.1567°N, 94.8050°E, 02.iii.2018, 16 specimens [ RMBH biv 417, including specimens RMBH biv 417_1, biv 417_2, and biv 417_3 being sequenced], Bolotov, Nyein Chan and Vikhrev leg. GoogleMaps

Other material examined. MYANMAR: Myit Tha (Manipur) River, 23.22845°N, 94.1434°E, Ayeyarwady River basin, 02.ii.2018, 6 specimens [ RMBH biv 336, including specimens RMBH biv336_1, biv 336_2, and biv 336_3 being sequenced], Bolotov, Nyein Chan and Vikhrev leg GoogleMaps ; Chindwin River, 23.1499°N, 94.3627°E, Ayeyarwady River basin, 04.ii.2018, 7 specimens [ RMBH biv 353 and biv 354, including specimens RMBH biv 353, biv 354_1, biv 354_2, and biv 354_3 being sequenced], Bolotov, Nyein Chan and Vikhrev leg. GoogleMaps

Differential diagnosis. Shell large, very elongated, inequilateral, irregularly elliptic with slightly curved or straight ventral margin and slightly raised dorsal margin, rather thick and moderately inflated. Periostracum dark-brown with well visible growth lines. Pseudocardinal teeth massive, lateral teeth long and sharp, mussel scars deep.

Molecular diagnosis. Trapezidens dolichorhynchus is closely related to T. angustior and T. yeti sp. nov. (mean uncorrected COI p-distances: 2.14% and 1.96% respectively), but it can be distinguished from the sister species by two fixed substitutions in the COI gene fragment as follows: 479 T and 569 G; two fixed substitutions in 16S rRNA gene fragment as follows: 186 T and 196 C.

Distribution. Endemic to the Ayeyarwady River, Myanmar.

Comments. Phylogenetically and morphologically, specimens from the Ayeyarwady, Chindwin, and Manipur rivers do not have any significant differences. Our novel results support the morphology-based hypothesis that the nominal taxa Trapezidens dolichorhynchus (Ayeyarwady) and Unio scutum var. humilior (Chindwin and Manipur) are conspecific ( Bolotov et al. 2017b).

COI

University of Coimbra Botany Department

T

Tavera, Department of Geology and Geophysics

Kingdom

Animalia

Phylum

Mollusca

Class

Bivalvia

Order

Unionida

Family

Unionidae

Genus

Trapezidens

Loc

Trapezidens dolichorhynchus ( Tapparone-Canefri, 1889 )

Konopleva, Ekaterina S., Bolotov, Ivan N., Kondakov, Alexander V., Kononov, Oleg D., Gofarov, Mikhail Yu., Tomilova, Alena A., Lunn, Zau, Chan, Nyein, Win, Than & Vikhrev, Ilya V. 2020
2020
Loc

Trapezidens obesa obesa ( Hanley & Theobald, 1876 )

Bolotov, I. N. & Vikhrev, I. V. & Kondakov, A. V. & Konopleva, E. S. & Aksenova, O. V. & Gofarov, M. Y. & Tumpeesuwan, S. 2017: 10
2017
Loc

Lamellidens canefrianus

Simpson, C. T. 1900: 857
1900
Loc

Unio scutum var. humilior

Martens, E. 1899: 45
1899
Loc

Unio dolichorhynchus

Tapparone-Canefri, C. 1889: 348
1889
Loc

Unio protensus

Tapparone-Canefri, C. 1889: 349
1889
Loc

Unio protensus var. ellipticus

Tapparone-Canefri, C. 1889: 350
1889
Loc

Unio gianellii

Tapparone-Canefri, C. 1889: 353
1889
Loc

Unio marginalis var. obesa

Hanley, S. & Theobald, W. 1876: 20
1876
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