The new phylogenetic relationships in Veneridae (Bivalvia: Venerida)

Liu, Yumeng; Ma, Peizhen; Zhang, Zhen; Li, Cui; Chen, Ya; Wang, Yunan; Wang, Haiyan

doi:10.1093/zoolinnean/zlac047

Cited by 5 publications

(2 citation statements)

References 54 publications

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“…Results also showed that all congeneric species in Mactridae clustered together, indicating closer relationships. Mitochondrial gene arrangements among closely related mollusks were usually highly conserved, although gene rearrangements could be relatively frequent in Mollusca [45][46][47]. In this study, most Mactridae species had 22 tRNAs, besides Spisula sibyllae (MG431821) and Mactra antiquata (KC503290, KC503291, and JQ423460), which had a duplication of trnM (Figure 4).…”

Section: Phylogeny and Gene Arrangement Analysismentioning

confidence: 62%

Sequencing of the Complete Mitochondrial Genome of the Big Brown Mactra Clam, Mactra grandis (Venerida: Mactridae)

Ma,

Liu,

et al. 2024

Animals

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Mitochondrial genomes are playing an increasingly important role in molluscan taxonomy, germplasm, and evolution studies. The first complete mitochondrial genome of the commercial big brown mactra clam, Mactra grandis, was characterized using Illumina next-generation sequencing in this study. The 17,289 bp circular genome has a typical gene organization of 13 protein-coding genes (PCGs), 2 rRNAs, and 22 tRNAs, with an obvious (A + T)-bias of 64.54%. All PCGs exhibited a homogeneous bias in nucleotide composition with a (A + T)-bias, a positive GC skew, and a negative AT skew. Results of phylogenetic analysis showed that Mactra grandis was most closely related to Mactra cygnus. The functional gene arrangement of the two species was identical but different from other Mactra species. The congeneric relationships among Mactra species were demonstrated by genetic distance analysis. Additionally, the selective pressure analysis suggested that cox1 was highly efficient for discriminating closely related species in genus Mactra, while nad2 was the most appropriate marker for population genetic analysis.

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Section: Phylogeny and Gene Arrangement Analysismentioning

confidence: 62%

Sequencing of the Complete Mitochondrial Genome of the Big Brown Mactra Clam, Mactra grandis (Venerida: Mactridae)

Ma,

Liu,

et al. 2024

Animals

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“…The same applies to freshwater unionoideans, marine infaunal anomalodesmatans, and razor clams (Cultellidae, Pharidae, Solecurtidae, and Solenidae) and other bivalves. Imbricated sculpture also tends to be rare in members of the veneroidean family Meretricidae (for phylogeny, see Liu et al, 2022), in which the sharp valve margins are associated with the formation of calcified periostracal pins and needles (Glover & Taylor, 2010). The absence of imbricated sculpture in Mytilidae might be related to the periostracum, which in most species extends as a thick smooth layer well over the commissure in life.…”

Section: Discussionmentioning

confidence: 99%

Imbricated shell sculpture in benthic bivalves

Vermeij

Thomson

2023

Journal of Morphology

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Molluscan shells display a high diversity of external sculpture. Sculptural elements may be symmetrical, where both edges of an element are morphologically similar, or asymmetrical, where one edge is steeper than the other. Asymmetrical sculpture can be ratcheted, with the leading edges (those in the direction of locomotion or growth) less steep than the trailing edges, or imbricated (leading edges steeper than trailing edges). While the ratcheted sculpture is better known, the diversity of imbricated sculpture has remained largely unexplored. In a survey of extant benthic shellbearing molluscs, we document imbricated sculpture primarily in epifaunal bivalves or on the exposed sectors of shells of semi-infaunal bivalves. Imbricated sculpture is particularly widespread in pteriomorphian bivalves, but it is absent in the subclade Mytiloidea as well as in highly mobile Pectinidae. It also occurs in many carditid bivalves (Archiheterodonta) and in phylogenetically scattered euheterodonts. In several infaunal bivalves including species of Cardites (Carditidae), Hecuba (Donacidae), and Chione (Veneridae), comarginal elements on the posterior sector are imbricated whereas anterior comarginal ridges are ratcheted. Imbricated sculpture in bivalves tends to be concentrated on the upper (left) valves of pectinids or on the posterior sector of both valves in archiheterodonts and euheterodonts.Imbricated sculpture is uncommon in gastropods, even in epifaunal species, but does occur in the collabral ridges in some Vasidae and a few other groups. Expression of imbricated sculpture does not depend on shell mineral composition or microstructure. The ecological distribution and within-shell pattern of expression of imbricated sculpture point to the likelihood that this type of asymmetrical sculpture is both widespread and potentially functional. Additionally, we present a potential methodology whereby shell sculpture categories (symmetrical, ratcheted, and imbricated) may be quantified by comparing the lengths of corresponding leading and trailing edges across the shell surface.

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