The Circulatory System and an Enigmatic Cell Type of the Cephalocarid Crustacean Hutchinsoniella Macracantha

Hessler, Robert R.; Elofsson, Rolf

doi:10.1163/20021975-99990107

Cited by 8 publications

(4 citation statements)

References 45 publications

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“…Hutchinsoniella has three pairs of ostia (scored 4) (Hessler and Elofsson, 2001), Leptostraca have seven pairs (scored 2) (Claus, 1888 for Nebalia).…”

Section: Nauplius Eye Position: (0) Nauplius Eye Close To Compound Eymentioning

confidence: 99%

Phylogeny of Branchiopoda (Crustacea) based on a combined analysis of morphological data and six molecular loci

2007

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The phylogenetic relationships of branchiopod crustaceans have been in the focus of a number of recent morphological and molecular systematic studies. Although agreeing in some respects, major differences remain. We analyzed molecular sequences and morphological characters for 43 branchiopods and two outgroups. The branchiopod terminals comprise all eight ''orders''. The molecular data include six loci: two nuclear ribosomal genes (18S rRNA, 28S rRNA), two mitochondrial ribosomal genes (12S rRNA, 16S rRNA), one nuclear protein coding gene (elongation factor 1a), and one mitochondrial protein coding gene (cytochrome c oxidase subunit I). A total of 65 morphological characters were analyzed dealing with different aspects of branchiopod morphology, including internal anatomy and larval characters. The morphological analysis resulted in a monophyletic Phyllopoda, with Notostraca as the sister group to the remaining taxa supporting the Diplostraca concept (''Conchostraca'' + Cladocera). ''Conchostraca'' is not supported but Cyclestheria hislopi is the sister group to Cladocera (constituting together Cladoceromorpha) and Spinicaudata is closer to Cladoceromorpha than to Laevicaudata. Cladocera is supported as monophyletic. The combined analysis under equal weighting gave results in some respects similar to the morphological analysis. Within Phyllopoda, Cladocera, Cladoceromorpha and Spinicaudata + Cladoceromorpha are monophyletic. The combined analysis is different from the morphological analysis with respect to the position of Notostraca and Laevicaudata. Here, Laevicaudata is the sister group to the remaining Phyllopoda and Notostraca is sister group to Spinicaudata and Cladoceromorpha. A sensitivity analysis using 20 different parameter sets (different insertion-deletion [indel] ⁄ substitution and transversion ⁄ transition ratios) show the monophyly of Anostraca, Notostraca, Laevicaudata, Spinicaudata, Cladoceromorpha, Cladocera, and within Cladocera, of Onychopoda and Gymnomera under all or almost all (i.e., 19 of 20) parameter sets. Analyses with an indel-to-transversion ratio up to 2 result in monophyletic Phyllopoda, with Laevicaudata as sister group to the remaining Phyllopoda and with Spinicaudata and Cladoceromorpha as sister groups. Almost all analyses (including those with higher indel weights) result in the same topology when only ingroup taxa are considered.Ó The Willi Hennig Society 2007.Branchiopoda comprise approximately 1180 described species of mainly freshwater dwelling crustaceans (Adamowicz and Purvis, 2005). It includes taxa with a general, archaic morphology very similar to that of some Cambrian and Devonian crustacean fossils (Anostraca, Notostraca, Spinicaudata), as well as taxa that are highly specialized for predatory, scraping, parasitism, and advanced filtration such as the water fleas (Scourfield

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“…Hutchinsoniella has three pairs of ostia (scored 4) (Hessler and Elofsson, 2001), Leptostraca have seven pairs (scored 2) (Claus, 1888 for Nebalia).…”

Section: Nauplius Eye Position: (0) Nauplius Eye Close To Compound Eymentioning

confidence: 99%

Phylogeny of Branchiopoda (Crustacea) based on a combined analysis of morphological data and six molecular loci

2007

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“…JCB has handled 13 publications devoted to that group. These papers have effectively covered almost the entire array of organ systems in that class: in chronological order beginning with the supposed compound eyes already noted above (Burnett, 1981); the central nervous system (Elofsson and Hessler, 1990) [which included a rebuttal of the paper of Burnett (1981) concerning remnants of compound eyes]; antennae ; the main excretory organs ; neurons (Elofsson, 1992); the digestive system (Elofsson et al, 1992); cuticle (Elofsson and Hessler, 1994); podocytes (Hessler and Elofsson, 1995); the reproductive system (Hessler et al, 1995); tegumental glands (Elofsson and Hessler, 1998); a new genus and species Hampsonella brasiliensis Hessler and Wakabara, 2000; the circulatory system (Hessler and Elofsson, 2001); and another new species, Sandersiella kikuchii Shimomura and Akiyama, 2008. If bound and published as a single book, these papers would constitute a sizeable monograph.…”

Section: Group ''Monographs''mentioning

confidence: 99%

“…These 13 articles carried on from where the earlier published monographs on the comparative anatomy, functional morphology, and larval development (Sanders, 1963), and skeleto-musculature (Hessler, 1964) of Hutchinsoniella macracantha had left off. Hessler and Elofsson (1999) summarized some of this JCB material in the short chapter they prepared for the Microscopic Anatomy of the Invertebrates, but of course the series of publications in JCB continued on after the deadline for that chapter, so while the 1999 chapter was 16 pages in length, the JCB cephalocarid series constitutes some 174 pages.…”

Section: Group ''Monographs''mentioning

confidence: 99%

“…Hessler and Elofsson (1999) summarized some of this JCB material in the short chapter they prepared for the Microscopic Anatomy of the Invertebrates, but of course the series of publications in JCB continued on after the deadline for that chapter, so while the 1999 chapter was 16 pages in length, the JCB cephalocarid series constitutes some 174 pages.…”

Section: Group ''Monographs''mentioning

confidence: 99%

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The First 30 Years of the Journal of Crustacean Biology – Systematics and Evolution

Schram

2010

Journal of Crustacean Biology

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Functional role of lacunar and muscular systems in the externa of Peltogasterella gracilis (Cirripedia: Rhizocephala)

Arbuzova,

Lianguzova,

Iliutkin

et al. 2023

Journal of Morphology

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One of the most conspicuous traits of parasitic organisms is a well‐developed reproductive system. In Rhizocephala (“Crustacea”: Cirripedia) it is believed to be nested in the externa—a “reproductive part” located outside of the host. However, it is not clear how nutrients are transported to the externa. Several authors described a system of lacunae in the externa, and muscular contractions probably enable transport through these cavities. The aim of our study was to visualize (using microcomputed tomography and confocal laser scanning microscopy) and describe lacunar and muscular systems in the externa of Peltogasterella gracilis (fam. Peltogasterellidae). The lacunar system consists of “ventral” lacuna and several protrusions. The “ventral” lacuna is probably responsible for visceral mass nutrition, and mantle protrusions are associated with the mantle nutrition. The gross organization of the muscular system mostly corresponds to previous descriptions in other rhizocephalan species. Nonetheless, we observed several features of the externa morphology that had not been described before such as a muscular thickening in the proximal externa's part and a stalk plug disk. The muscular thickening might play a role of a propulsatory organ, helping to transport liquid through the lacunar system. The plug disk might fill the hole in the host's cuticle after the old externa drop off. The results allow us to make first assumptions on transport mechanisms in Rhizocephala.

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The Circulatory System and an Enigmatic Cell Type of the Cephalocarid Crustacean Hutchinsoniella Macracantha

Cited by 8 publications

References 45 publications

Phylogeny of Branchiopoda (Crustacea) based on a combined analysis of morphological data and six molecular loci

Phylogeny of Branchiopoda (Crustacea) based on a combined analysis of morphological data and six molecular loci

The First 30 Years of the Journal of Crustacean Biology – Systematics and Evolution

Functional role of lacunar and muscular systems in the externa of Peltogasterella gracilis (Cirripedia: Rhizocephala)

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