Diversity of Kinorhyncha in Japan and Phylogenetic Relationships of the Phylum

Yamasaki, Hiroshi

doi:10.1007/978-4-431-56432-4_21

Cited by 8 publications

(7 citation statements)

References 53 publications

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“…Until this study, variation was rarely mentioned for kinorhynch species (e. g., Neuhaus et al , 2014Neuhaus & Kegel 2015) and was not even thought to be of any importance for kinorhynch taxonomy (Sørensen & Pardos 2008;Neuhaus 2013;Dal Zotto et al 2013;Yamasaki 2016Yamasaki , 2017. Our current observation of an enormous amount of variation in C. shirleyi sp.…”

Section: Discussionmentioning

confidence: 50%

“…nov. show a considerable amount of variation in the arrangement of spines, female appendages, and sensory spots (Table 5). Whereas variation in the latter two characters has not been considered as critical for taxonomic purposes, the spine formula is usually used as one of the key characters for identifying species of Kinorhyncha (Neuhaus 1993(Neuhaus , 2013Dal Zotto et al 2013;Sørensen & Pardos 2008;Neuhaus et al , 2014Neuhaus & Kegel 2015;Yamasaki 2016Yamasaki , 2017. Most variation in C. shirleyi sp.…”

Section: Descriptionmentioning

confidence: 99%

“…obs.). Spine pattern was and still is regarded as taxonomically important for Kinorhyncha (Sørensen & Pardos 2008;Neuhaus 2013;Dal Zotto et al 2013;Yamasaki 2016Yamasaki , 2017, but at the time of the original description of C. setoensis (previously C. megastigma) in 2010 no information was available about the variation of the spine pattern of kinorhynch species described subsequently Neuhaus et al , 2014Neuhaus & Kegel 2015;this paper). Also, Sørensen et al (2010b) were the first to describe the ventromedial appendages on segments 7 and 8 and the ventromedial large area of micropapillae on segment 9.…”

Section: Comments About Selected Morphological Charactersmentioning

confidence: 99%

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Revision of Condyloderes (Kinorhyncha, Cyclorhagida) including description of Condyloderes shirleyi sp. nov.

Neuhaus¹,

Zotto²,

Yamasaki³

et al. 2019

Zootaxa

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The description of a new representative of the species-poor genus Condyloderes Higgins, 1969 from the Northeast Pacific (Alaska) is reported. The analyzed specimens of Condyloderes shirleyi sp. nov. showed a significant variation of numerous morphological characters, along with female-specific traits known also from other congeneric species. These findings stimulated the re-investigation of the type material of the six species of Condyloderes described so far, i.e., C. kurilensis Adrianov & Maiorova, 2016, C. megastigma Sørensen, Rho & Kim, 2010b, C. multispinosus (McIntyre, 1962) Higgins, 1969, C. paradoxus Higgins, 1969, C. setoensis Adrianov, Murakami & Shirayama, 2002, and C. storchi Higgins, 2004 in Martorelli & Higgins, 2004. Our study allowed to reveal various morphological novelties and to emend the diagnosis of these species and of the genus Condyloderes. Furthermore, our analysis led to synonymize C. megastigma with C. setoensis. The results of our investigation about the significant variation in C. shirleyi sp. nov. raise a wider question on species identity within Kinorhyncha, underscoring the necessity, if possible, to describe new species from a higher number of specimens and to concentrate on the morphological variation of the going-to-be-described species.

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Section: Discussionmentioning

confidence: 50%

Section: Descriptionmentioning

confidence: 99%

Section: Comments About Selected Morphological Charactersmentioning

confidence: 99%

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Revision of Condyloderes (Kinorhyncha, Cyclorhagida) including description of Condyloderes shirleyi sp. nov.

Neuhaus¹,

Zotto²,

Yamasaki³

et al. 2019

Zootaxa

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“…Our material showed the characters defining the monotypical genus Franciscideres Dal Zotto et al, 2013. The specific identification faces the taxonomical conflict arising from the insufficiency of the original information about the type species and the recent evidence that Kinorhyncha species can show a considerably larger intraspecific variability than previously assumed (Neuhaus & Sørensen 2013;Neuhaus & Kegel 2015;Neuhaus et al 2014Neuhaus et al , 2019Sánchez et al 2019;. Though intraspecific variation was rarely thought to be important for the taxonomy of kinorhynchs (Sørensen & Pardos 2008;Dal Zotto et al 2013;Neuhaus 2013;Yamasaki 2016Yamasaki , 2017, the huge variation described for some species (e.g., Neuhaus et al 2019;Sánchez et al 2019) highlights a change of mind and emphasizes the need of paying attention to such variation. TABLE 1.…”

Section: Introductionmentioning

confidence: 77%

New record of the soft-bodied genus Franciscideres (Kinorhyncha) from Argentina, with notes on its movement and morphological variation

Neuhaus

Bulnes

Cazzaniga

2020

Zootaxa

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Samples collected from Monte Hermoso, Buenos Aires Province, Argentina revealed the presence of specimens of the genus Franciscideres Dal Zotto et al., 2013, previously known only from Brazil. This morphotype seems to differ from the only known species, Franciscideres kalenesos Dal Zotto et al., 2013, in the following characters: (1) presence of ventrolateral tubes on segment 1, (2) introvert features, (3) each segment composed of a closed cuticular ring, (4) trunk cuticle ornamented by a secondary fringe of knob-like structures, (5) posterior margin of segment 10 ventrally terminating in two lateral and one broad triangular lobes, (6) posterior margin of segment 11 centrally terminating in four lobes (7) lateral terminal spines armed with thorn-like processes, (8) pores/sensory spots/gland cells distribution and (9) sexual dimorphism in segments 10 and 11. Because of the lack of full information about F. kalenesos from Brazil, we consider the new exemplars as Franciscideres cf. kalenesos. Additionally, we provide new information about the movement of this species using light microscopy and we compare these movements with those of other meiofaunal inhabitants.

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“…This unusual colouring, combined with the remote locality far away from regions with a better-explored kinorhynch fauna, made us expect that this was a new species, that could be described in a short, taxonomic contribution. However, reality turned out to be way more complicated, and three years of intensive work and 64 manuscript pages later, we could conclude that the Hawaiian species was Echinoderes sensibilis species that so far was known from Japan only (Adrianov et al 2002b;Yamasaki 2017). The path to this conclusion went through the redescription of thirteen known species of Echinoderes, examination of so far unidentified species from museum collections, synonymization of two known species, and the description of two species new to science.…”

Section: Introductionmentioning

confidence: 98%

Description, redescription and revision of sixteen putatively closely related species of Echinoderes (Kinorhyncha: Cyclorhagida), with the proposition of a new species group – the Echinoderes dujardinii group

Sørensen

Goetz

Herranz

et al. 2020

EJT

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Thirteen species of Echinoderes with nearly identical spine/tube patterns, and apparently similar tergal extensions were re-examined and compared. Based on this, redescriptions and/or emended species diagnoses are provided for Echinoderes aureus, E. dujardinii, E. gerardi, E. imperforatus, E. pacificus, E. pilosus, E. sensibilis, E. sublicarum and E. worthingi, and new details about cuticular structures are added for E. kozloffi and E. gizoensis. The new information derived from the redescriptions, and the subsequent comparative studies revealed that: 1) the holotype of Echinoderes lanceolatus is identical with the types of Echinoderes aureus, and E. lanceolatus is thus a junior synonym of E. aureus; other potentially synonymous species that should be addressed further in the future include: E. dujardinii + E. gerardi; E. imperforatus + E. sensibilis, and E. pacificus + E. sublicarum; 2) the paratypes of E. lanceolatus represented a different yet undescribed species, here described as E. songae Sørensen & Chang sp. nov.; 3) a comparison with literature information about E. ehlersi showed that the species is so insufficiently described that a redescription of topotype material is required before the species should be considered for taxonomic comparison; 4) specimens from the Andaman Islands, India, that previously have been reported as Echinoderes cf. ehlersi represent two different undescribed species, of which one is described as E. chandrasekharai Sørensen & Chatterjee sp. nov. and the other is left undescribed due to the limited material available; 5) out of a total of fifteen addressed species, it is proposed that eleven represent a putatively monophyletic group that is named the Echinoderes dujardinii group. The group includes following species: E. dujardinii, E. ehlersi, E. gerardi, E. imperforatus, E. kozloffi, E. sensibilis, E. pacificus, E. sublicarum, E. songae Sørensen & Chang sp. nov., E. chandrasekharai Sørensen & Chatterjee sp. nov., and Echinoderes sp. from the Andaman Islands, and is supported by a similar spine/tube pattern (except for variation regarding the presence of lateral accessory tubes on segment 8); generally short middorsal spines, especially on segments 4 to 6; glandular cell outlets type 1 always present in middorsal positions on segments 1 to 3, and in subdorsal positions on segments 4 to 9; glandular cell outlets type 2 always present in laterodorsal or midlateral positions on segment 8, and sometimes in same positions on segment 9 but never at any other segments or positions; female papillae always present on sternal plates of segments 7 and 8, and occasionally also on segment 6; tergal extensions well-spaced, triangular, gradually tapered cones, and pectinate fringes of sternal extensions are differentiated into seta-like tufts. The comparisons furthermore showed potential taxonomic significance of two echinoderid character traits that previously have been slightly neglected as diagnostic traits, namely the presence and appearance of female papillae, and the dorsal pattern of glandular cell outlets type 1. Female papillae may occur on the sternal plates of segments 6 to 8, but the positions may differ from ventrolateral to ventromedial, and the morphology of the intracuticular substructure also differ at species level. Information about position and morphology of female papillae proved helpful for species recognition, but it might also provide information of phylogenetic importance. Analyses of glandular cell outlet type 1 patterns on the dorsal sides of segments 1 to 9 in species of Echinoderidae, revealed several apparently unique or rare patterns, but also three distinct patterns that applied to larger groups of species. One pattern is the one present in all species of the E. dujardinii group, whereas the other two common patterns included 1) middorsal outlets on segments 1 to 3, and paradorsal outlets on segments 4 to 9 (found in 27 species), and 2) middorsal outlets on segments 1 to 3, 5 and 7, and paradorsal outlets on segments 4, 6 and 8 to 9 (found in 27 species)

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Diversity of Kinorhyncha in Japan and Phylogenetic Relationships of the Phylum

Cited by 8 publications

References 53 publications

Revision of Condyloderes (Kinorhyncha, Cyclorhagida) including description of Condyloderes shirleyi sp. nov.

Revision of Condyloderes (Kinorhyncha, Cyclorhagida) including description of Condyloderes shirleyi sp. nov.

New record of the soft-bodied genus Franciscideres (Kinorhyncha) from Argentina, with notes on its movement and morphological variation

Description, redescription and revision of sixteen putatively closely related species of Echinoderes (Kinorhyncha: Cyclorhagida), with the proposition of a new species group – the Echinoderes dujardinii group

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