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<p>A new gastrotrich species of the genus <i>Kryptodasys</i> (Macrodasyida: Macrodasyidae) is described from 12&#xa0;m depth at Capron Shoal, Florida, USA. The new species is up to 572&#xa0;μm long and can be distinguished by the presence of distinct pestle organs at the neck constriction and by the number and distribution of adhesive tubes. The tubes are arranged bilaterally as four TbA, 24 TbVL, and five TbP on a short tail. There is also a pair of accessory adhesive tubes (AT) that arise from a common base. Animals are simultaneous hermaphrodites with paired elongate testes, each with a sperm duct that connects mid-testis and extends medially and posteriorly to a common seminal vesicle, which is a novel find for the genus. A pouch-like frontal organ is positioned posterior of the seminal vesicle and a caudal organ is present near the terminal end of the intestine. The structure of the caudal organ appears unique for the genus and consists of two distinct chambers. The outer chamber is bag-like, surrounded by a longitudinally oriented circular muscle sheath, and possesses a postero-ventral pore. The internal chamber is glandulomuscular: it contains a glandular canal wrapped in spiral muscles. The somatic and visceral muscles of the animal are also described to provide novel insights for the genus and phylum.</p>

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A new species of Kryptodasys (Gastrotricha: Macrodasyida) from Florida with detailed description of the reproductive system using CSLM

  • 期刊论文

  • 发表日期：

    2026年3月28日

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  • Thiago Quintão Araújo,
  • Rick Hochberg

摘要

A new gastrotrich species of the genus Kryptodasys (Macrodasyida: Macrodasyidae) is described from 12 m depth at Capron Shoal, Florida, USA. The new species is up to 572 μm long and can be distinguished by the presence of distinct pestle organs at the neck constriction and by the number and distribution of adhesive tubes. The tubes are arranged bilaterally as four TbA, 24 TbVL, and five TbP on a short tail. There is also a pair of accessory adhesive tubes (AT) that arise from a common base. Animals are simultaneous hermaphrodites with paired elongate testes, each with a sperm duct that connects mid-testis and extends medially and posteriorly to a common seminal vesicle, which is a novel find for the genus. A pouch-like frontal organ is positioned posterior of the seminal vesicle and a caudal organ is present near the terminal end of the intestine. The structure of the caudal organ appears unique for the genus and consists of two distinct chambers. The outer chamber is bag-like, surrounded by a longitudinally oriented circular muscle sheath, and possesses a postero-ventral pore. The internal chamber is glandulomuscular: it contains a glandular canal wrapped in spiral muscles. The somatic and visceral muscles of the animal are also described to provide novel insights for the genus and phylum.