Two new species of the similis-subgroup of Triconia Böttger-Schnack, 1999 (Copepoda, Oncaeidae) and a redescription of T. denticula Wi, Shin &amp; Soh, 2011 from the northeastern equatorial Pacific

Cho, Kyuhee; Böttger-Schnack, Ruth; Kim, Woong-Seo; Lee, Wonchoel

doi:10.5252/zoosystema2019v41a28

Cited by 711 publications

(1 citation statement)

References 24 publications

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“…Apart from the detailed morphological/taxonomical analysis and documentation (figures) of Spinoncaea species from the open equatorial Pacific, for the first time individual variation of numerous morphometric characters was analyzed for all three species, including proportions of body somites (e.g., anal somite, genital (double-)somite) and armature elements, such as the proportional lengths of endopodal and exopodal spines on the swimming legs, which have been found as limited but useful characters for differentiation between species of other oncaeid genera (e.g., Triconia Böttger-Schnack, 1999) (Heron et al 1984;Heron and Bradford-Grieve 1995;Cho et al 2013Cho et al , 2017Cho et al , 2019. The respective data obtained for Spinoncaea did in most cases not turn out to be useful for discrimination of the three species in this genus (Tables 3, 4).…”

Section: Discussionmentioning

confidence: 99%

Taxonomy of three species of the genus Spinoncaea (Copepoda, Oncaeidae) in the North Pacific Ocean with focus on morphological variability

Cho¹,

Park²,

Böttger-Schnack³

2021

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Three species of Spinoncaea Böttger-Schnack, 2003 are newly recorded in three locations of the equatorial and temperate Pacific Ocean collected by using a net of 60 μm mesh size. For all three species, morphological characters and patterns of ornamentation were analyzed in detail and illustrations of both sexes, also including form variants of the females, are provided. For the first time, information about the variability of various continuous (morphometric) characters are given, such as the spine lengths on the rami of the swimming legs or the proportions of urosomites. The complementary morphological descriptions of the Pacific specimens focus on similarities or modifications of characters as compared to earlier descriptions of these species from the type locality and various other localities. For S. ivlevi (Shmeleva, 1966), originally but insufficiently described from the Adriatic Sea, the Pacific material is similar in most aspects to the comprehensive redescription of the species from the Red Sea and from the type locality, except for a difference in the morphometry of the distal endopod segment on the antenna, which is discussed here. For S. tenuis Böttger-Schnack, 2003, and S. humesi Böttger-Schnack, 2003, the Pacific material mostly coincides with the characteristic features as described in the original account from the Red Sea. For all three species, differences and/or additions in ornamentation details were found in Pacific specimens (e.g., on the intercoxal sclerite of the first swimming leg or on the genital somite of the male) and females with aberrant morphology were detected. Genetic analyses based on 12S srRNA revealed for two species, S. ivlevi and S. humesi, little or no differences in genetic sequences between Pacific specimens and those recorded from the Mediterranean Sea, thus demonstrating that specimens from both locations are conspecific. For S. tenuis, for which no comparable genetic data are available, 12S srRNA amplification was unsuccessful as was the amplification of mitochondrial COI (barcoding) for all three species. The applicability of using COI amplification for barcoding of oncaeid copepods is discussed.

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Section: Discussionmentioning

confidence: 99%

Taxonomy of three species of the genus Spinoncaea (Copepoda, Oncaeidae) in the North Pacific Ocean with focus on morphological variability

Cho¹,

Park²,

Böttger-Schnack³

2021

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The microcopepod family Oncaeidae: state of knowledge and perspectives

Böttger-Schnack

Schnack

2023

Mar Biol

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Since the discovery of the first oncaeid copepod described by Philippi in 1843 as Oncaea venusta, great progress has been achieved regarding the morphological/descriptive taxonomy of the microcopepod family Oncaeidae, occurring in all great oceans and all depth layers of the ocean. The species diversity of this family is still underestimated and the ecological role of oncaeids within the marine ecosystem is not yet well understood, but the life strategy appears to be fundamentally different from most other pelagic microcopepod families. The present paper aims at a comprehensive review of the current state of knowledge of this microcopepod family, including taxonomic and phylogenetic issues, questions of species identification, specific morphological and molecular genetic characteristics, information on regional and vertical distribution and abundance, motion behaviour, feeding and food relationships, reproduction aspects, biomass and elemental composition, respiration and metabolic rates. Relevant open questions are highlighted, and examples are given of shortcomings and high uncertainties in results of current attempts to include oncaeid copepods in various aspects of global marine ecosystem studies. It is concluded that continued support of taxonomic research is required for Oncaeidae and other small copepod species, based on an integrated approach of morphological and molecular genetic methods and user-friendly regional identification keys, to allow an adequate consideration of oncaeids in advanced ecological studies and to achieve a better understanding of the ecological role of this abundant microcopepod family in marine ecosystems.

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GBIF custom download for research into locational uncertainty in the world's preserved specimens collections

2021

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Two new species of the similis-subgroup of Triconia Böttger-Schnack, 1999 (Copepoda, Oncaeidae) and a redescription of T. denticula Wi, Shin & Soh, 2011 from the northeastern equatorial Pacific

Cited by 711 publications

References 24 publications

Taxonomy of three species of the genus Spinoncaea (Copepoda, Oncaeidae) in the North Pacific Ocean with focus on morphological variability

Taxonomy of three species of the genus Spinoncaea (Copepoda, Oncaeidae) in the North Pacific Ocean with focus on morphological variability

The microcopepod family Oncaeidae: state of knowledge and perspectives

GBIF custom download for research into locational uncertainty in the world's preserved specimens collections

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