Priapulids are cylindrical worm-like animals, ranging from 0.2 to 0.3 [13] to 39 centimetres [14] (0.08–0.12 to 15.35 in) long, with a median anterior mouth quite devoid of any armature or tentacles. They show both radial and bilateral symmetry.

鳃曳动物门（学名： Priapulida）是动物界的一个门，是一小类海洋底栖动物，多分布在靠近两极地区的冷海中，在泥沙中、浅海或管居生活。 身体虽然有体环，但是不分节。 目前已知仅现存20多种。 它们的近亲是 动吻动物门，此两门统称为有棘动物（Scalidophora）。 本门的拉丁文名来自希腊神话中的生殖之神 普里阿普斯，因本门的一些种在外观上类似雄性智人的阴茎。 形体小或中等，最大5毫米至20厘米不等。 身体呈圆柱形，分化为吻、躯干和尾部。 吻能翻转，生 …

Priapulid, (phylum Priapulida), any of some 15 species of predatory, marine, mud-inhabiting, unsegmented worms. Once considered a class of the former phylum Aschelminthes or placed with echiuran and sipunculan worms in the former phylum Gephyrea, priapulids have no obvious relationship to any other

2021年11月1日 · Priapulid worms show an intriguing habit associated with juvenile brachiopods. In the recent years, exceptional fossil sites have revealed astonishing details on the anatomy, lifestyles and behaviour of Cambrian animals but surprisingly, very little is known about one of their most vital features, reproduction.

2024年9月1日 · In this study we examine morphological structures of adult Priapulus caudatus specimens from three localities (White Sea, Gullmarsfjord and North Sea) using light microscopy, scanning electron microscopy (SEM) and histology.

2012年11月1日 · Priapulida is a phylum of marine, infaunal worms (Land and van der, 1970, Storch, 1991). Only 18 valid species are currently known from the group, of which 10 belong to the meiobenthos (see e.g. Land and van der, 1968, Land, 1982, Por, 1972, Morse, 1981, Adrianov and Malakhov, 1999, Todaro and Shirley, 2003).

2014年1月1日 · The phylum Priapulida includes eight species in six genera of cylindrical, benthonic animals. Enclosed in a chitinous cuticle that is periodically molted, the unsegmented body is divided into an anterior proboscis and a posterior trunk, from which caudal appendages of uncertain function extend in some species (Fig. 1).

Priapulids are worm-like pseudocoelomate invertebrates that appear in the fossil record some 500 million years ago in the Cambrian Period. They have survived virtually unchanged up to the present and so qualify as living fossils.

Priapulida (pri´a-pyu´li-da) (Gr. priapos, phallus, + ida, pl. suffix) are a small group (only 18 species) of marine worms found chiefly in colder waters of both hemispheres. They have been reported along the Atlantic coast from Massachusetts to Greenland and along the Pacific coast from California to Alaska.

2010年8月1日 · Here we show, by using experimental ichnology, that the treptichnid burrow systems were most probably produced by priapulid worms or by worms that used the same locomotory mechanisms as the Recent priapulids (e.g., Priapulus). Their typical three-dimensional morphology with repeated arcuate probing branches suggests that their function was ...