Planodasys marginalisgen. et sp. nov. and Planodasyidae fam. nov. (Gastotricha Magrodasyoidea)

Rao, G. C.; Clausen, Claus

doi:10.1080/00364827.1970.10411164

Cited by 54 publications

(22 citation statements)

References 4 publications

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“…Order Chaetonotida Remane, 1925[Rao & Clausen, 1970 Suborder Paucitubulatina d 'Hondt, 1971 Family Chaetonotidae Gosse, 1864 (sensu Leasi & Todaro, 2008) Subfamily Chaetonotinae Kisielewski, 1991Genus Heterolepidoderma Remane, 1927 Heterolepidoderma acidophilum n. sp. (Fig.…”

Section: Taxonomic Revisionsmentioning

confidence: 99%

A phylogenetic approach to species delimitation in freshwater Gastrotricha from Sweden

2011

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Gastrotricha is a cosmopolitan group ofaquatic invertebrates. To date, approximately 765species have been described. This study is the first todeal with species delimitation and cryptic species offreshwater Gastrotricha. Three commonly encounteredspecies, Heterolepidoderma ocellatum, Lepidochaetuszelinkai, and Lepidodermella squamata, areinvestigated for cryptic speciation. Most of thematerial is based on Swedish specimens but closelyrelated species from other parts of the world are alsoincluded. Taxonomic revisions are supported byphylogenies based on 18S rRNA, 28S rRNA, andCOI mtDNA of freshwater Chaetonotidae from severalgenera and inferred from Bayesian and maximumlikelihood approaches. Heterolepidoderma ocellatumf. sphagnophilum is raised to species level, under thename H. acidophilum n. sp. Moreover, genetic databased on COI indicate large variation between twomorphologically very similar groups of Lepidodermellasquamata. The extent of cryptic speciation inL. zelinkai appears low. Based on the phylogenetichypothesis presented in this article, the new species,Lepidodermella intermedia n. sp., from northernSweden is also described. The phylogenetic hypothesisgenerated shows that Chaetonotidae is a nonmonophyleticgroup

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Section: Taxonomic Revisionsmentioning

confidence: 99%

A phylogenetic approach to species delimitation in freshwater Gastrotricha from Sweden

2011

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“…Similarly, genera of Planodasyidae (Rao & Clausen 1970) are defined by characters that are either present in other families (#21, diagonal row of anterior adhesive tubules as in Mucrodusys; #33, anterior location of ova directly behind the testes as in Dolichodusys) or are plesiomorphies (i.e., paired ova, biramous caudal end, numerous epidermal glands and lateral adhesive tubules). The only putative autapomorphy for the family appears to be the presence of paired ova in the anterior body region (requiring anterior to posterior maturation as in some Lepidodasyidae, #3 1 ).…”

Section: Lepidodasyidae and Planodasyidaementioning

confidence: 99%

Macrodasyida (Gastrotricha): a cladistic analysis of morphology

Hochberg

Litvaitis

2001

Invertebrate Biology

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Abstract. A cladistic analysis based on 33 morphological characters was performed for the 3 I genera currently assigned to the order Macrodasyida (Gastrotricha). Outgroup analysis indicated that the order is monophyletic and that it is defined by the structure of the pharynx and the complex distribution of duo-gland adhesive organs. Of the 6 currently recognized families in Macrodasyida, our analysis confirmed that 4 families are monophyletic: Dactylopodolidae, Macrodasyidae, Thaumastodermatidae and Turbanellidae. Dactylopodolidae was further confirmed as the most basal family within the order based on the retention of several plesiomorphies. The other three families have well-defined autapomorphies but will require further investigation to increase inter-and intrafamilial phylogenetic resolution. Planodasyidae appeared to be a paraphyletic taxon with no obvious autapomorphies; genera clustered among members of a polyphyletic family, Lepidodasyidae. We recommend that future research on macrodasyidan phylogeny focus on issues of comparative morphology and ultrastructure in lesser-known taxa such as the Dactylopodolidae, and on the taxa Lepidodasyidae and Planodasyidae. Additional key words: phylogeny, aschelmmthesGastrotrichs are free-living, microscopic invertebrates with a worldwide distribution in freshwater, estuarine, and marine benthic habitats. Most gastrotrichs are less than 1 mm long as adults and move predominantly by ciliary action. Marine forms inhabit sediment interstices of coastal beaches and continental shelves, while freshwater gastrotrichs lead an epiphytic or semiplanktonic existence (Hummon 1982). Gastrotrichs are common members of the nieiobenthos and are often found in association with other microscopic fauna, such as nematodes, turbellarians, and harpacticoid copepods. In intertidal habitats, marine gastrotrichs are occasionally one of the numerically most abundant groups of meiofauna (Hochberg 1999).The 61 genera and 525 described species of Gastrotricha are divided between the two orders Chaetonotida and Macrodasyida. The principal criteria for distinguishing the orders include general body shape, distribution of adhesive tubules, orientation of the pharyngeal lumen, and the presence of pharyngeal pores (Ruppert 199 I ). Chaetonotidans are distributed equally among freshwater and marine habitats, generally have a ten-pin body shape, are hermaphroditic andlor parthenogenic, most with an adhesive tube at each tip of a caudal furca. Macrodasyidans are predominantly ma-" Author for correspondence. E-mail: rickh@cisunix.unh.edu rine, hermaphroditic worms with a more elongate body and a complex distribution of adhesive tubes. While far from speciose, gastrotrichs show remarkable morphological diversity on a simple vermiform body plan. Ultrastructural studies have contributed a wealth of information on the complexities of body wall structure

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“…Recently, Megadasys was transferred to the taxon Planodasyidae Rao & Clausen, 1970 due to similarities with species of Crasiella concerning reproductive anatomy and sperm ultrastructure (Guidi et al 2014). The taxon Cephalodasys Remane, 1926 so far comprises twelve species (Hummon & Todaro 2010, Hummon 2011, Kieneke & Schmidt-Rhaesa 2015, Todaro 2015.…”

Section: Discussionmentioning

confidence: 99%

“…Phylum Gastrotricha Mečnikow, 1865 Order Macrodasyida Remane, 1925[Rao & Clausen, 1970 Family Cephalodasyidae Hummon & Todaro, 2010 Genus Cephalodasys Remane, 1926Hummon (1974a provided the first diagnosis of the genus beyond Remane's (1926) original description of Cephalodasys maximus. Since then, Cephalodasys was reclassified from the Lepidodasyidae to the Cephalodasyidae (see Hummon & Todaro 2010) but a rediagnosis of the genus was not provided.…”

Section: Taxonomic Accountmentioning

confidence: 99%

A new species of Cephalodasys (Gastrotricha, Macrodasyida) from the Caribbean Sea with a determination key to species of the genus

Kieneke

Schmidt‐Rhaesa²,

Hochberg

2015

Zootaxa

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A new marine gastrotrich species of the genus Cephalodasys is described from shallow sublittoral coralline sand sampled between Lee Stocking Island and Norman's Pond Cay (Exuma Cays), Bahamas. Cephalodasys interinsularis n. sp. reaches a body length of 471 µm and is characterized by a new combination of characters including six total anterior adhesive tubes and five pairs of ventrolateral adhesive tubes. The new species is morphologically similar to C. swedmarki but can be distinguished by the different number of anterior adhesive tubes, the spatial arrangement of the ventrolateral adhesive tubes, and a shorter pharynx. We provide an updated diagnosis of the genus and a determination key to all known species of Cephalodasys. C. interinsularis n. sp. is the third known species of Cephalodasys from the Caribbean marine province.

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Planodasys marginalisgen. et sp. nov. and Planodasyidae fam. nov. (Gastotricha Magrodasyoidea)

Cited by 54 publications

References 4 publications

A phylogenetic approach to species delimitation in freshwater Gastrotricha from Sweden

A phylogenetic approach to species delimitation in freshwater Gastrotricha from Sweden

Macrodasyida (Gastrotricha): a cladistic analysis of morphology

<strong>A new species of <em>Cephalodasys</em> (Gastrotricha, Macrodasyida) from the Caribbean Sea with a determination key to species of the genus</strong>

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