Document of bibliographic reference 339911

BibliographicReference record

Type

Bibliographic resource

Type of document

Journal article

BibLvlCode

AS

Title

Tima nigroannulata (Cnidaria: Hydrozoa: Eirenidae), a new species of hydrozoan from Japan

Abstract

Tima nigroannulata sp. nov. is described from medusae collected in shallow waters of four prefectures on the Pacific coast of Japan (Miyagi, Fukushima, Kanagawa, and Miyazaki), as well as from cultures maintained at two aquaria (Enoshima Aquarium, Kanagawa Prefecture; Tsuruoka City Kamo Aquarium, Yamagata Prefecture). Adult medusae differ from those of other known species of the genus Tima Eschscholtz, 1829 in the following combination of characters: (1) umbrella usually hemispherical or higher, (2) marginal tentacles up to 50 or more in number; and (3) black pigment granules form a ring around the umbrella rim, and sometimes extend onto the tentacles and radial canals. Their hydroids, from aquarium cultures, have stolonal colonies with pedicels of varied length, vestigial hydrothecae, slender and vase- to club-shaped hydranths, and a whorl of about 20 filiform tentacles with an intertentacular web basally. Medusa buds develop singly within gonothecae that arise from the hydrothecal pedicels. The cnidomes of both hydroid and medusa stages comprise heteronemes, provisionally identified as microbasic mastigophores. Medusae of T. nigroannulata are confirmed as a unique, cohesive lineage by comparing mtDNA COI sequence fragments with those from two congeners, resulting in three well-supported reciprocally monophyletic clades, one representing each species. Records of the western Atlantic medusa Tima formosa L. Agassiz, 1862 from Japan overlap those of T. nigroannulata, and are believed to have been based on the new species described herein.

WebOfScience code

https://www.webofscience.com/wos/woscc/full-record/WOS:000680429200010

Bibliographic citation

Calder, D.R.; Crow, G.L.; Ikeda, S.; Adachi, A.; Yamamoto, G.; Harrington, A.; Holland, B.S. (2021). Tima nigroannulata (Cnidaria: Hydrozoa: Eirenidae), a new species of hydrozoan from Japan. Zool. Sci. 38(4): 1-13. https://dx.doi.org/10.2108/zs210011

Topic

Marine

Is peer reviewed

true

Access rights

open access

Is accessible for free

true