Scaphopoda / skæˈfɒpədə / (plural scaphopods / ˈskæfəpɒdz /, from Ancient Greek σκᾰ́φης skáphē "boat" and πούς poús "foot"), whose members are also known as tusk shells or tooth shells, are a class of shelled marine invertebrates belonging to the phylum Mollusca with worldwide distribution and are the only class of exclusively infaunal marine mo...

Scaphopods are all ma­rine species whose habi­tat ranges from shal­low sub-lit­toral areas up to wa­ters that are 4570 m deep. Most scaphopods are found in wa­ters greater than 6 m. Scaphopods bur­row in sed­i­ments rang­ing from muds to medium-coarse gravel. The two or­ders of this group may have slightly dif­fer­ing bur­row­ing be­hav­iors.

2020年8月18日 · The Scaphopoda are small but interesting class of molluscs. Their common name is Tusk Shells because the curved, hollow and cylindrical shells resemble small tusks. One of the most distinctive aspect of the Scaphopodan shell is that it …

2023年9月22日 · Here, by presenting chromosome-level genomes from both extant scaphopod orders and leveraging complete genomes spanning Mollusca, we provide strong support for Scaphopoda as the sister taxon of Bivalvia, revitalizing the morphology-based Diasoma hypothesis originally proposed 50 years ago.

掘足纲（Scaphopoda）全部是海产泥沙中穴居的一类小型软体动物。 贝壳呈长圆锥形、稍弯曲的管状，两端开口，故又名管壳类（Siphonoconchae）。 壳的直径由后向前逐渐加大，并向腹面弯曲，因此成象牙形或喇叭形，壳长4mm～15cm，多数在3～6cm之间。 例如角贝（Dentalium），它的壳呈黄白色，个别种呈明亮的绿色。 壳面光滑或具刻纹。 前端壳口较大，头与足由此孔伸出壳外，并倾斜埋于泥沙中。 后端的壳口较小，一般露出沙面之外，是其出、 …

2023年12月30日 · In order to access the more convenient and stable food source of organic deposits, multiple lineages of scaphopods went through a process called “Scaphopodization,” elongating their shell to have their previously protruding rostrum fit together into a new streamlined shape, which aids movement and feeding.

2023年9月27日 · 该研究首次构建了掘足纲（Scaphopoda）贝类染色体水平基因组，并在系统基因组学水平证实了Diasoma假说（掘足纲-双壳纲为姐妹群），解决了长达半个世纪关于掘足纲分类地位的争议。

2002年1月1日 · The Scaphopoda are marine infaunal carnivores that feed on foraminiferans and other microorganisms selected and manipulated by their unique feeding tentacles or captacula. Their tusk-like shell is open at both ends; the burrowing foot and captacula protrude anteriorly, while respiratory currents pass through the posterior opening.

掘足类为两侧对称的动物，具一个两端开口的长圆锥形管状贝壳，稍弯曲，似象牙。 贝壳由前到后逐渐变细，前端的开口为前壳口，又称头足孔，足可自此伸出；后端的开口为后壳口，为海水进出外套腔的开口。 贝壳略拱，凹的一面为背方，凸的一面为腹方。 外套膜管状，衬于贝壳内表面，末端背方伸出贝壳之外，为重要的感觉器官。 头部不明显，前端有一个能伸缩的吻，吻前端中央为口，在吻的基部两侧生有许多细长、末端膨大的头丝 (captacula)。 头丝的伸缩性很强，可 …

The Scaphopoda are marine infaunal carnivores that feed on foraminiferans and other microorganisms selected and manipulated by their unique feeding tentacles or captacula. Their tusk-like shell is open at both ends; the burrowing foot and captacula protrude anteriorly, while respiratory currents pas …