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A new gregarious sabellid worm from the Gulf of California reproducing by spontaneous fission (Polychaeta, Sabellidae)

Published online by Cambridge University Press:  18 March 2014

María Ana Tovar-Hernández  and
Harlan Dean
María Ana Tovar-Hernández*
Affiliation:
El Colegio de Sinaloa. Gral. Antonio Rosales 435 Poniente, C.P. 80000, Culiacán, Sinaloa, México
Harlan Dean
Affiliation:
Department of Invertebrate Zoology, Museum of Comparative Zoology, Harvard University, 26 Oxford Street, Cambridge, MA 02138, USA
*
Correspondence should be addressed to: M.A. Tovar-Hernández, El Colegio de Sinaloa. Gral. Antonio Rosales 435 Poniente, C.P. 80000, Culiacán, Sinaloa, México email: maria_ana_tovar@yahoo.com
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Abstract

A new species of the sabellid genus Pseudobranchiomma is described from 50 cm depth in dock fouling from the southern Gulf of California. Pseudobranchiomma schizogenica sp. nov., belongs to a group of six species characterized by having radiolar serrations extending for most of the radiolar length. The new species is characterized by the presence of a unique set of features related to the covering of the peristomium by lateral collar margins, the shape of the first ventral shield, the size of interramal eyespots, and the width of the hood of thoracic and abdominal spinelike chaetae. Information about live and post-fixed colour, glandular pattern and reproduction is also provided. The new species described here is compared with all species in the former group. The presence of paired patches of cilia without heads (kinocilia-type) on ventral lappets and ventral shields of the collar, thorax and abdomen is documented for the first time in the genus Pseudobranchiomma. Dense aggregations of Pseudobranchiomma schizogenica sp. nov., on docks from the southern Gulf of California are predominantly a result of asexual reproduction taking place during summer, when 82% of the population reproduces by architomy.

Keywords

schizogamyasexualcolonialkinociliafan wormPseudobranchiomma
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 94 , Issue 5 , August 2014 , pp. 935 - 946
Copyright
Copyright © Marine Biological Association of the United Kingdom 2014 

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