Deep-sea Tanaidacea (Crustacea) of the North-east Atlantic: the tribe Agathotanaini

Bird, Graham J.; Holdich, D. M.

doi:10.1080/00222938800771001

Cited by 24 publications

(30 citation statements)

References 8 publications

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“…The only specimen of the "swimming" male of Agathotanais ingolfi exam− ined here was smaller (2 mm long) than the female (2.9-3.6 mm, see Bird and Holdich, 1988). The difference in size between adult female and swimming male has been already observed (Sieg 1986;Błażewicz−Paszkowycz 2004;Jóźwiak et al 2009).…”

Section: Family Agathotanaidae Lang 1971mentioning

confidence: 74%

“…The next−closest matches were to Paranarthrura aff. lusitanus Bird et Holdich, 1988, and Para− narthrura sp. A, indicating that male 6A might belong to the Agathotanaidae, but this designation must remain tenuous pending further sequencing.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover in food deprived deep−sea habi− tats, where population densities might be near the threshold of what is reproduc− tively sustainable (Rex and Etter 2010), investing energy in terminal (swimming) males might be too great an expenditure. From this perspective, the presence in the population of numerous non−swimming males as observed by Bird and Holdich (1988) might be a strategy for living in low density. More studies implementing population genetics are undeniably needed, but it could be assumed that those swimming males maintain or increase the genetic diversity of the population through increased gene flow, which might be crucial to survival in an environment as unpredictable as the deep−sea.…”

Section: Discussionmentioning

confidence: 99%

“…This type of male has been reported for Agathotanaidae Lang, 1971, Anarthruridae Lang, 1971, Colletteidae Larsen et Wilson, 2002, as well as for Tanaellidae Larsen et Wilson, 2002. Because morphologically they re− semble the females or juvenile stages, they are occasionally called "juvenile males", although they are presumably sexually mature (Bird and Holdich 1988).…”

Section: Introductionmentioning

confidence: 99%

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Discovery of Swimming Males of Paratanaoidea (Tanaidacea)

Błażewicz¹,

Jennings²,

Jeskulke³

et al. 2014

Polish Polar Research

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Abstract:In Tanaidacea morphological identification of male individuals to the species level is complicated by two factors: the presence of multiple male stages/instars confuse the assessment of sexual stage while strong sexual dimorphism within several families ob− scures the morphological affinities of undescribed males to described females. Males of Paratanaoidea are often morphologically quite different from females and have not been discovered for most genera so far, which has led to the assumption that some tanaidaceans might have parthenogenetic reproduction or simply have undeveloped secondary sex traits. As a part of the IceAGE project (Icelandic marine Animals: Genetics and Ecology), with the support of molecular methods, the first evidence for the existence of highly dimorphic (swimming) males in four families of the superfamily Paratanaoidea (Agathotanaidae, Cryptocopidae, Akanthophoreidae, and Typhlotanaidae) is presented. This study suggests that these males might be the next instars after juvenile or preparatory males, which are morphologically similar to females. It has been assumed that "juvenile" males with a re− stricted ability for swimming (e.g., undeveloped pleopods) have matured testes, are capable of reproduction, and mate with females nearby, while swimming males can mate with dis− tant females. Our explanation of the dimorphism in Tanaidomorpha lies in the fact that males of some species (e.g., Nototanais) retain the same lifestyle or niche as the females, so secondary traits improve their ability to guard females and successfully mate. Males of other species that have moved into a regime (niche) different than that of the female have acquired complex morphological changes (e.g., Typhlotanais).

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Section: Family Agathotanaidae Lang 1971mentioning

confidence: 74%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Discovery of Swimming Males of Paratanaoidea (Tanaidacea)

Błażewicz¹,

Jennings²,

Jeskulke³

et al. 2014

Polish Polar Research

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“…These features are shared with Coalecerotanais Larsen, 2003 (Family incertae sedis), but the genus differs from our specimens in that the cheliped has the posterior free region and attaches to the cephalothorax via a sclerite (Larsen 2003b;Błażewicz-Paszkowycz et al 2011). A fused segment comprising pereonite 6 and the pleon is also found in Metagathotanais Bird and Holdich, 1988 (Agathotanaidae), but in Metagathotanais, this segment is laterally concave, the cephalothorax is longer than wide, the labrum is rounded, and pereopod 6 is present (Bird and Holdich 1988). Our specimens thus did not belong in Coalecerotanais or Metagathotanais.…”

Section: Introductionmentioning

confidence: 80%

<i>Tsuranarthrura shinsei</i>, a New Genus and Species in Anarthruridae (Crustacea: Tanaidacea) from the Northwestern Pacific

2018

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We establish the new anarthrurid genus Tsuranarthrura gen. nov. based on the new species T. shinsei sp. nov. collected from 1890 m depth off the eastern coast of Japan, northwestern Pacific Ocean. Tsuranarthrura gen. nov. is the third paratanaoid genus with members having a fused segment composed of pereonite 6 and the pleon, a character state previously restricted to the genera Coalecerotanais Larsen, 2003 (Family incertae sedis) and Metagathotanais Bird and Holdich, 1988 (Family Agathotanaidae). Among anarthrurid genera, Tsuranarthrura gen. nov. is similar to Anarthrura Sars, 1882, Anarthrurella Bird, 2004, and Crenicarpus Drumm and Bird, 2016 in having the labrum not laterally compressed and the antenna with naked fourth and fifth articles from the distal end. However it differs from the latter three in having pereonite 6 fused with the pleon, the maxillipedal endite with a distal seta, the chelipedal merus with a ventral simple seta, and the merus naked on pereopods 2 and 3. We also present the nucleotide sequence for part of the cytochrome c oxidase subunit I (COI) gene in T. shinsei for future use in DNA barcoding or phylogeny.

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Review of the Taxonomy, Diversity, Ecology, and Other Biological Aspects of Order Tanaidacea from Japan and Surrounding Waters

Kakui

2016

Diversity and Commonality in Animals

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The order Tanaidacea is a group of benthic crustaceans, most of which are small, up to a few millimeters long. Tanaidaceans are distributed worldwide, with more than 1,200 described species. Following the first taxonomic paper on a Japanese tanaidacean in 1936, many researchers have studied their taxonomy, morphology, reproductive biology, or ecology in the waters around Japan. This chapter presents a brief introduction to tanaidaceans and then reviews what is known of their systematics (taxonomy and phylogeny), biology (including feeding habits, phenology, morphology, reproductive modes, parasites, predators), and ecology in Japan. The chapter ends with a summary and prospects for future research. The general conclusion is that tanaidaceans have been under-studied, both globally and within Japan; the 104 nominal species reported from around Japan and the 1,200 species reported globally likely represent a fraction of the actual diversity. The phylogeny of tanaidaceans is largely unresolved at all taxonomic levels. Recent, significant new discoveries dealing with herbivory, selfing, skin-digging activity in holothuroid hosts, possible sound production, and tube building suggest that much remains to be learned about their general biology.

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Deep-sea Tanaidacea (Crustacea) of the North-east Atlantic: the tribe Agathotanaini

Cited by 24 publications

References 8 publications

Discovery of Swimming Males of Paratanaoidea (Tanaidacea)

Discovery of Swimming Males of Paratanaoidea (Tanaidacea)

<i>Tsuranarthrura shinsei</i>, a New Genus and Species in Anarthruridae (Crustacea: Tanaidacea) from the Northwestern Pacific

Review of the Taxonomy, Diversity, Ecology, and Other Biological Aspects of Order Tanaidacea from Japan and Surrounding Waters

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