A new genus and species of oceanic planktonic Tisbidae (Crustacea, Copepoda, Harpacticoida) with enlarged modified eyes
Both sexes of a new monotypic genus of Tisbidae (Copepoda, Harpacticoida) are described from the epi- or mesopelagic zone in the Kuroshio region, Japan. Gyorome guttatum gen. et sp. nov. belongs to a monophyletic lineage of deepwater holoplanktonic genera defined by a suite of characters. Within thi...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Pensoft Publishers
2024-02-01
|
| Series: | ZooKeys |
| Online Access: | https://zookeys.pensoft.net/article/114974/download/pdf/ |
| _version_ | 1797304145718280192 |
|---|---|
| author | Sota Komeda Susumu Ohtsuka Rony Huys |
| author_facet | Sota Komeda Susumu Ohtsuka Rony Huys |
| author_sort | Sota Komeda |
| collection | DOAJ |
| description | Both sexes of a new monotypic genus of Tisbidae (Copepoda, Harpacticoida) are described from the epi- or mesopelagic zone in the Kuroshio region, Japan. Gyorome guttatum gen. et sp. nov. belongs to a monophyletic lineage of deepwater holoplanktonic genera defined by a suite of characters. Within this clade, Gyorome gen. nov. appears most closely related to Neotisbella Boxshall, 1979. The most distinguishable feature of G. guttatum gen. et sp. nov. is the presence of large, paired, frontal modified eyes, each consisting of a baculiform ocellus, a globular (Gicklhorn’s?) organ, and a semi-parabolic plate. The taxonomic position of Tisbe spinulosa Bradford & Wells, 1983 is discussed and a key to the six meso- and bathypelagic tisbid species is provided. Confusion surrounding earlier literature reports of supernumerary elements on the caudal ramus in some harpacticoid taxa is clarified. Secondary modifications of ocellar components of the typical naupliar eye in the Harpacticoida are reviewed. It is suggested that the development of specialized eyes in G. guttatum gen. et sp. nov. may provide a means for detecting bioluminescent food particles in oligotrophic pelagic environments. The large, vaulted prosome indicates the species is an opportunistic macrophage that has adopted gorging as a feeding strategy. |
| first_indexed | 2024-03-08T00:04:14Z |
| format | Article |
| id | doaj.art-863552d842d2411abdedb8b749682624 |
| institution | Directory Open Access Journal |
| issn | 1313-2970 |
| language | English |
| last_indexed | 2024-03-08T00:04:14Z |
| publishDate | 2024-02-01 |
| publisher | Pensoft Publishers |
| record_format | Article |
| series | ZooKeys |
| spelling | doaj.art-863552d842d2411abdedb8b7496826242024-02-17T10:40:36ZengPensoft PublishersZooKeys1313-29702024-02-01119130733810.3897/zookeys.1191.114974114974A new genus and species of oceanic planktonic Tisbidae (Crustacea, Copepoda, Harpacticoida) with enlarged modified eyesSota Komeda0Susumu Ohtsuka1Rony Huys2Marine Ecology Research InstituteHiroshima UniversityThe Natural History MuseumBoth sexes of a new monotypic genus of Tisbidae (Copepoda, Harpacticoida) are described from the epi- or mesopelagic zone in the Kuroshio region, Japan. Gyorome guttatum gen. et sp. nov. belongs to a monophyletic lineage of deepwater holoplanktonic genera defined by a suite of characters. Within this clade, Gyorome gen. nov. appears most closely related to Neotisbella Boxshall, 1979. The most distinguishable feature of G. guttatum gen. et sp. nov. is the presence of large, paired, frontal modified eyes, each consisting of a baculiform ocellus, a globular (Gicklhorn’s?) organ, and a semi-parabolic plate. The taxonomic position of Tisbe spinulosa Bradford & Wells, 1983 is discussed and a key to the six meso- and bathypelagic tisbid species is provided. Confusion surrounding earlier literature reports of supernumerary elements on the caudal ramus in some harpacticoid taxa is clarified. Secondary modifications of ocellar components of the typical naupliar eye in the Harpacticoida are reviewed. It is suggested that the development of specialized eyes in G. guttatum gen. et sp. nov. may provide a means for detecting bioluminescent food particles in oligotrophic pelagic environments. The large, vaulted prosome indicates the species is an opportunistic macrophage that has adopted gorging as a feeding strategy.https://zookeys.pensoft.net/article/114974/download/pdf/ |
| spellingShingle | Sota Komeda Susumu Ohtsuka Rony Huys A new genus and species of oceanic planktonic Tisbidae (Crustacea, Copepoda, Harpacticoida) with enlarged modified eyes ZooKeys |
| title | A new genus and species of oceanic planktonic Tisbidae (Crustacea, Copepoda, Harpacticoida) with enlarged modified eyes |
| title_full | A new genus and species of oceanic planktonic Tisbidae (Crustacea, Copepoda, Harpacticoida) with enlarged modified eyes |
| title_fullStr | A new genus and species of oceanic planktonic Tisbidae (Crustacea, Copepoda, Harpacticoida) with enlarged modified eyes |
| title_full_unstemmed | A new genus and species of oceanic planktonic Tisbidae (Crustacea, Copepoda, Harpacticoida) with enlarged modified eyes |
| title_short | A new genus and species of oceanic planktonic Tisbidae (Crustacea, Copepoda, Harpacticoida) with enlarged modified eyes |
| title_sort | new genus and species of oceanic planktonic tisbidae crustacea copepoda harpacticoida with enlarged modified eyes |
| url | https://zookeys.pensoft.net/article/114974/download/pdf/ |
| work_keys_str_mv | AT sotakomeda anewgenusandspeciesofoceanicplanktonictisbidaecrustaceacopepodaharpacticoidawithenlargedmodifiedeyes AT susumuohtsuka anewgenusandspeciesofoceanicplanktonictisbidaecrustaceacopepodaharpacticoidawithenlargedmodifiedeyes AT ronyhuys anewgenusandspeciesofoceanicplanktonictisbidaecrustaceacopepodaharpacticoidawithenlargedmodifiedeyes AT sotakomeda newgenusandspeciesofoceanicplanktonictisbidaecrustaceacopepodaharpacticoidawithenlargedmodifiedeyes AT susumuohtsuka newgenusandspeciesofoceanicplanktonictisbidaecrustaceacopepodaharpacticoidawithenlargedmodifiedeyes AT ronyhuys newgenusandspeciesofoceanicplanktonictisbidaecrustaceacopepodaharpacticoidawithenlargedmodifiedeyes |