scholarly journals Indonaia rectangularis (Tapparone-Canefri, 1889), comb. nov., a forgotten freshwater mussel species from Myanmar (Bivalvia, Unionidae)

ZooKeys ◽  
2019 ◽  
Vol 852 ◽  
pp. 23-30
Author(s):  
Ivan N. Bolotov ◽  
Ilya V. Vikhrev ◽  
Manuel Lopes-Lima ◽  
Mikhail Y. Gofarov ◽  
Ekaterina S. Konopleva ◽  
...  
Keyword(s):  
Freshwater Mussels ◽  
Freshwater Mussel ◽  
Original Description ◽  
Shell Shape ◽  
Nominal Species ◽  
Restricted Range ◽  
Additional Species ◽  
River Watershed ◽  
Mussel Species

Uniorectangularis Tapparone-Canefri, 1889 is a little-known nominal species of freshwater mussels described from a tributary of the Ayeyarwady River in Myanmar. This taxon was considered a synonym of Gibbosulalaosensis (Lea, 1863), a margaritiferid species. However, the range of Gibbosulalaosensis does not encompass the Ayeyarwady River watershed. Here we re-examine the holotype of Uniorectangularis and provide a conchological re-description of this species. Based on conchological features such as the shell shape, elevated umbo, and the structure of lateral and pseudocardinal teeth, we transfer this taxon to the genus Indonaia Prashad, 1918 and propose I.rectangularis (Tapparone-Canefri, 1889), comb. nov. It appears to be a rare freshwater mussel species with a restricted range, because it has not been found since the original description. Two additional species in this genus are known from Myanmar, i.e. Indonaiaandersoniana (Nevill, 1877) and I.subclathrata (Martens, 1899).

scholarly journals A new Contradens from Laos (Bivalvia: Unionidae: Contradentini)

2019 ◽  
Vol 24 ◽  
pp. 25-31
Author(s):  
Ekaterina S. Konopleva ◽  
Ivan N. Bolotov ◽  
Vitaly M. Spitsyn ◽  
Alexander V. Kondakov ◽  
Mikhail Yu. Gofarov ◽  
...  
Keyword(s):  
Endemic Species ◽  
Freshwater Mussel ◽  
Type Locality ◽  
Shell Shape ◽  
New Taxon ◽  
Restricted Range ◽  
Nucleotide Substitutions ◽  
Mussel Species ◽  
Mekong Basin ◽  
Rare Endemic

Here, we describe Contradens novoselovi sp. nov. (Bivalvia: Unionidae), a new freshwater mussel species from the Mekong Basin in Laos. Phylogenetic and morphological analyses reveal that the new taxon is closely related to Contradens comptus (Deshayes & Jullien, 1874) but can be distinguished from it by a smaller size, sub-ovate shell shape, tiny wrinkles near umbo, stronger pseudocardinal and lateral teeth, and fixed nucleotide substitutions. Contradens novoselovi sp. nov. is known only from the type locality in northwestern Laos and may represent a rare endemic species with restricted range.

A Monograph of the Freshwater Mussels (Mollusca: Pelecypoda) of the Australian Region

1958 ◽  
Vol 9 (3) ◽  
pp. 372 ◽  
Author(s):  
DF McMichael ◽  
ID Hiscock
Keyword(s):  
Solomon Islands ◽  
Freshwater Mussels ◽  
New Guinea ◽  
Shell Morphology ◽  
Nominal Species ◽  
Additional Species ◽  
Larval Stages ◽  
Australian Region ◽  
New Subgenus ◽  
The Family

This monograph incorporates a systematic revision of the freshwater mussels of the Australian Region (Australia, New Zealand, New Guinea and the Solomon Islands). Previous systematic works are revised and discussed. Details of the taxonomic procedures used in the present work are presented. One aberrant New Guinea genus, Haasodonta, with two species is referred provisionally to the family Unionidae Fleming, subfamily Rectidentinae Modell. The remainder of the Australasian species are assigned to the family Mutelidae Gray. Four subfamilies, Velesunioninae Iredale, Lortiellinae Iredale, Hyridellinae Iredale, and Cucumerunioninae Iredale, are recognized. These include eight genera, Velesunio Iredale, Alathyria Iredale, Weatralunio Iredale, Microdontia Tapparone Canefri, Lortiella Iredale, Hyridella Swainson, Cucumerunio Iredale, and Virgus Simpson. The genus Hyridella includes four subgenera, Hyridella s.s., Protohyridella Cotton & Gabriel, Nesonaia Haas, and a new subgenus for H. menziesi Gray. These eight genera include 27 species, three of which are polytypic. Three additional species are considered of doubtful validity and two nominal species are listed as nomina dubia. Each taxon is redescribed and all available data of shell morphology, soft anatomy, larval stages, distribution, and type material are presented. The distribution of the Australian and New Guinea species in relation to the fluvifaunal provinces of Iredale and Whitley is considered and a new name is proposed for the fluvifaunula of southern New Guinea. The evolutionary relationships of the Australasian freshwater mussels are discussed and it is suggested that, with one exception, they arose from a single ancestral stock and have subsequently differentiated into four subfamilies within this region. This view is supported by the close anatomical similarity between them.

The genus Trophomera Rubtsov & Platonova, 1974 with description of T. litoralis sp. n. (Nematoda: Benthimermithidae) from the tidal zone of the Kuril Archipelago and proposal of Benthimermis Petter, 1980 as a junior synonym

Nematology ◽  
2006 ◽  
Vol 8 (3) ◽  
pp. 411-423 ◽  
Author(s):  
Dmitry M. Miljutin
Keyword(s):  
Body Length ◽  
Original Description ◽  
Junior Synonym ◽  
Zoological Nomenclature ◽  
Nominal Species ◽  
Tidal Zone ◽  
Annotated List ◽  
The Family ◽  
Tail Shape ◽  
Emended Description

Abstract The type species of Trophomera, T. iturupiensis, is redescribed from type material and important errors in the original description corrected. As a result of this emended description, Benthimermis is proposed as a junior synonym of Trophomera and its species transferred accordingly. The family name Benthimermithidae is retained according to articles 23.1 and 40.1 of the International Code of Zoological Nomenclature. Trophomera is diagnosed and an annotated list of nominal species presented. Trophomera litoralis sp. n., collected from the tidal zone of Ushishir Island (Kuril Archipelago), is described on the basis of four males. The males of T. litoralis sp. n. differ from those of other Trophomera species primarily by the much higher number of precloacal supplementary organs (105-108 vs 2-68). Trophomera litoralis sp. n. is most similar to T. regalis comb. n. yet differs by shorter body length (5.8-9.3 vs 14.9 mm), body proportions (a = 67-107 vs 124.4; c = 61-97 vs 135.7), greater length of the intermediate spermatoduct between the anterior and posterior testes (ca 1/7th vs ca 1/140th of body length), tail shape (rounded conoid vs pointed conoid), and number of precloacal supplementary organs (105-108 vs 49).

scholarly journals Morphology and distribution of the freshwater mussel Diplodon granosus, a rare and poorly understood species

2020 ◽  
Vol 50 (1) ◽  
pp. 44-53 ◽  
Author(s):  
Igor Christo MIYAHIRA ◽  
Maria Cristina Dreher MANSUR ◽  
Daniel Mansur PIMPÃO ◽  
Sheyla Regina Marques COUCEIRO ◽  
Sonia Barbosa dos SANTOS
Keyword(s):  
South America ◽  
Freshwater Mussels ◽  
Freshwater Mussel ◽  
Wide Distribution ◽  
Large Area ◽  
The North ◽  
Coastal Rivers ◽  
The Status ◽  
Long Time

ABSTRACT Diplodon granosus was one of the first freshwater mussels to be described for South America. However, the status of the species was confusing for a long time, receiving different taxonomic treatments. In this paper, we redescribe the shell, with new data on the soft parts and information on the distribution and conservation of D. granosus, a rarely recorded species. The shell is thin, not inflated; the macrosculpture is composed only by granules that cover the whole shell, not forming bars; the microsculpture comprises short spikes. In the soft parts we highlight the few, weak and irregularly distributed lamellar connections of the outer demibranch and some features of the stomach, such as the distally enlarged minor typhlosole. There are records of D. granosus over a large area of South America, from Guiana to Argentina. However, most of these records are related to other species and the distribution of D. granosus is restricted to the north of South America in the basins of the Amazonas and Orinoco rivers, and coastal rivers in between. Despite this wide distribution, the species occurs in specific habitats, mainly streams (igarapés), resulting in an extremely fragmented occurrence. Thus, any disturbance to these habitats can threat this freshwater mussel.

Redescription of The Southern Dumpling SquidEuprymna Tasmanicaand A Revision of The GenusEuprymna(Cephalopoda: Sepiolidae)

1997 ◽  
Vol 77 (4) ◽  
pp. 1109-1137 ◽  
Author(s):  
M.D. Norman ◽  
C.C. Lu
Keyword(s):  
Vibrio Fischeri ◽  
Taxonomic Status ◽  
Valid Species ◽  
Nominal Species ◽  
Undescribed Species ◽  
Additional Species ◽  
Symbiotic Associations ◽  
Luminescent Bacteria ◽  
Group A ◽  
Recent Attention

Recent attention to members of the sepiolid squid genusEuprymnaand symbiotic associations with luminescent bacteria (Vibrio fischeristrains) has prompted a review of this poorly-resolved group of squids. Twelve nominal species have been placed in this genus of which the majority are ill-defined, known only from their original descriptions and separated on the basis of inadequate characters. As a first step in resolving this group, a temperate Australian species, the Southern dumpling squid,Euprymna tasmanica, is here redescribed in detail. As the genusEuprymnacurrently stands, most members are only distinguished on the number and position of enlarged suckers in mature males. No diagnostic characters are available to identify females. All nominal species placed in this genus are reviewed and a key to proposed valid species is presented. Six species are considered here to be valid:Euprymna berryi, E. hoylei, E. morsei, E. scolopes, E. tasmanicaand an undescribed species treated here asEuprymnasp. 1.Euprymna similisis a synonym ofE. morseiof Japan. Due to inadequate original descriptions, and lost or poor type material, two species are considered here to benomen dubia(E. schneehageniandE. pusilla), while the taxonomic status of four additional species remain unresolved (E. albatrossae, E. bursa, E. phenaxandE. stenodactyla).

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