Numerous specimens belonging to an undescribed macrodasyid gastrotrich species were recovered during a survey of the biota associated with the severely dysoxic sediments of the Santa Barbara Basin, off California, U.S.A. Densities of this species reach 10 specimens cm(-2). Urodasys anorektoxys sp. nov. is described and figured. Specimens of this taxon attain the largest size within the genus; body, excluding the motile rail, is up to 1100 mu m in length. Adults are protandric, then simultaneous hermaphrodites and lack a stylet-like sexual structure; the main morphological traits include (1) a unitary ventral ciliary field, and (2) a pharyngeal region that bears a total of 14 pairs of adhesive tubes, 12 pairs ventrolaterally and two pairs dorsolaterally. The systematic position of the new species is discussed.

A new species of Urodasys (Gastrotricha, Macrodasyida) from dysoxic sediments of the Santa Barbara Basin (California, USA) / Todaro, Mary Antonio Donatello; Bernhard, J. M.; Hummon, W. D.. - In: BULLETIN OF MARINE SCIENCE. - ISSN 0007-4977. - STAMPA. - 66:(2000), pp. 467-476.

A new species of Urodasys (Gastrotricha, Macrodasyida) from dysoxic sediments of the Santa Barbara Basin (California, USA)

TODARO, Mary Antonio Donatello;
2000

Abstract

Numerous specimens belonging to an undescribed macrodasyid gastrotrich species were recovered during a survey of the biota associated with the severely dysoxic sediments of the Santa Barbara Basin, off California, U.S.A. Densities of this species reach 10 specimens cm(-2). Urodasys anorektoxys sp. nov. is described and figured. Specimens of this taxon attain the largest size within the genus; body, excluding the motile rail, is up to 1100 mu m in length. Adults are protandric, then simultaneous hermaphrodites and lack a stylet-like sexual structure; the main morphological traits include (1) a unitary ventral ciliary field, and (2) a pharyngeal region that bears a total of 14 pairs of adhesive tubes, 12 pairs ventrolaterally and two pairs dorsolaterally. The systematic position of the new species is discussed.
2000
66
467
476
A new species of Urodasys (Gastrotricha, Macrodasyida) from dysoxic sediments of the Santa Barbara Basin (California, USA) / Todaro, Mary Antonio Donatello; Bernhard, J. M.; Hummon, W. D.. - In: BULLETIN OF MARINE SCIENCE. - ISSN 0007-4977. - STAMPA. - 66:(2000), pp. 467-476.
Todaro, Mary Antonio Donatello; Bernhard, J. M.; Hummon, W. D.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/307414
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 13
  • ???jsp.display-item.citation.isi??? 9
social impact