A supplement to molecular data for five free-living marine nematode species of the family Comesomatidae Filipjev, 1918 (Nematoda: Chromadorida) from North Vietnam

A new free-living marine nematode species from marine sediments in the East China Sea, is described here as Perspiria boucheri sp. nov. The new species is characterized by amphideal fovea surrounded partially by body annulations; four cephalic setae stout; conical buccal cavity with a minute dorsal tooth and two ventrosublateral teeth; pharynx with a pyriform terminal bulb; tail elongated, conical with 3/4 posterior cylindrical portion which having distinct coarse annulations; spicules strongly curved with narrow ventral velum, handle-shaped proximally; gubernaculum canoe-shaped, without apophysis. The new species differs from the most similar species Perspiria striaticaudata (Timm, 1962) by strongly curved spicules with handle-shaped proximal end, gubernaculum without dorsal apophysis and relatively shorter tail. Updated key to all species of Perspiria is provided.

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Two new freshwater planarian species (Platyhelminthes: Tricladida: Dugesiidae) partially sympatric in Argentinean Patagonia

Canadian Journal of Zoology ◽

10.1139/cjz-2020-0169 ◽

2021 ◽

pp. 269-278

Author(s):

M. Lenguas Francavilla ◽

L. Negrete ◽

A. Martínez-Aquino ◽

C. Damborenea ◽

F. Brusa

Keyword(s):

Phylogenetic Analysis ◽

Molecular Data ◽

Neotropical Region ◽

Free Living ◽

Mitochondrial Coi ◽

Argentinean Patagonia ◽

The Family ◽

Taxonomic Approach ◽

Morphological And Molecular Data ◽

Endemic Flora

Girardia Ball, 1974 is the most diverse and widely distributed genus of the family Dugesiidae (Platyhelminthes: Continenticola) in the Neotropical region. Seven out of the 52 species of the genus are known for Argentina. The Somuncurá Plateau is a region in northern Patagonia with several endemic flora and fauna, but little is known about the free-living Platyhelminthes. We describe two new species of Girardia partially inhabiting in sympatry in the Somuncurá Plateau: Girardia somuncura sp. nov. and Girardia tomasi sp. nov. The identification criteria that we followed was an integrative taxonomic approach based on morphological and molecular data. Thus, we used anatomical features focused on the reproductive system, together with a phylogenetic analysis, using a mitochondrial (COI barcode region) genetic marker. This study is the first phylogenetic analysis of the genus Girardia in which we include the southernmost representatives of America here described, thus making it possible to incorporate them in global phylogenies.

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Phylogenetic position and taxonomy of Cycloseris explanulata and C. wellsi (Scleractinia: Fungiidae): lost mushroom corals find their way home

Contributions to Zoology ◽

10.1163/18759866-08103001 ◽

2012 ◽

Vol 81 (3) ◽

pp. 125-146 ◽

Cited By ~ 57

Author(s):

Francesca Benzoni ◽

Roberto Arrigoni ◽

Fabrizio Stefani ◽

Bastian T. Reijnen ◽

Simone Montano ◽

...

Keyword(s):

Molecular Study ◽

Molecular Data ◽

Phylogenetic Position ◽

Distribution Data ◽

Data Sets ◽

Free Living ◽

New Findings ◽

The Family ◽

Ecological Implications ◽

History Of

The scleractinian species Psammocora explanulata and Coscinaraea wellsi were originally classified in the family Siderastreidae, but in a recent morpho-molecular study it appeared that they are more closely related to each other and to the Fungiidae than to any siderastreid taxon. A subsequent morpho-molecular study of the Fungiidae provided new insights regarding the phylogenetic relationships within that family. In the present study existing molecular data sets of both families were analyzed jointly with those of new specimens and sequences of P. explanulata and C. wellsi. The results indicate that both species actually belong to the Cycloseris clade within the family Fungiidae. A reappraisal of their morphologic characters based on museum specimens and recently collected material substantiate the molecular results. Consequently, they are renamed Cycloseris explanulata and C. wellsi. They are polystomatous and encrusting like C. mokai, another species recently added to the genus, whereas all Cycloseris species were initially thought to be monostomatous and free-living. In the light of the new findings, the taxonomy and distribution data of C. explanulata and C. wellsi have been updated and revised. Finally, the ecological implications of the evolutionary history of the three encrusting polystomatous Cycloseris species and their free-living monostomatous congeners are discussed.

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Two new species of Comesomatidae (Nematoda) from the East China Sea

Zootaxa ◽

10.11646/zootaxa.4407.4.9 ◽

2018 ◽

Vol 4407 (4) ◽

pp. 573

Author(s):

MIAN HUANG ◽

YONG HUANG

Keyword(s):

East China Sea ◽

Buccal Cavity ◽

Nematode Species ◽

East China ◽

Marine Nematode ◽

The East China Sea ◽

Free Living ◽

China Sea ◽

Dichotomous Key ◽

Two New Species

Two new free-living marine nematode species of the genus Paracomesoma and genus Metacomesoma belonging to family Comesomatidae are described from the sublittoral sediment of the East China Sea. Paracomesoma zhangi sp. nov. is characterized by cuticle with fine transverse rows of dots, without lateral differentiation; buccal cavity with three small teeth; cephalic setae 13.5 μm long; multispiral amphideal fovea with three turns; spicules slender and elongated with thick cuticularized proximal end; gubernaculum plate-like without apophysis; 26 minute precloacal supplements. Metacomesoma macramphida sp. nov. is characterized by very small buccal cavity without teeth; inner and outer labial sensilla papilliform; four cephalic setae 1.5 μm long; multispiral amphideal fovea large, with 4.5 turns; spicules slender and elongated, with cephalated proximal end and finger-shaped distal end; gubernaculum plate-like, without apophysis; precloacal supplements absent. An updated dichotomous key for the identification of the males of the species of Paracomesoma is provided.

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A New Free-living Marine Nematode Species of the Genus Graphonema (Nematoda: Chromadorida: Chromadoridae) from Antarctica

Species Diversity ◽

10.12782/specdiv.24.61 ◽

2019 ◽

Vol 24 (1) ◽

pp. 61-67

Author(s):

Daisuke Shimada ◽

Megumu Tsujimoto ◽

Kentaro Watanabe

Keyword(s):

Nematode Species ◽

Marine Nematode ◽

Free Living

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New free-living marine nematode species (Nematoda: Desmodoridae) from the coast of New Zealand

Zootaxa ◽

10.11646/zootaxa.2611.1.4 ◽

2010 ◽

Vol 2611 (1) ◽

pp. 45

Author(s):

D. LEDUC ◽

D. A. WHARTON

Keyword(s):

New Zealand ◽

Sexual Dimorphism ◽

Nematode Species ◽

Marine Nematode ◽

Head Region ◽

Free Living ◽

Intertidal Sand

Pseudochromadora reathae n. sp. is described from intertidal sand in Otago Harbour (southern New Zealand), and Pseudodesmodora lacrima n. sp. is described from subtidal sediment in the Firth of Thames (northern New Zealand). Pseudochromadora reathae n. sp. differs from other species of the genus through the combination of the following characters: sexual dimorphism in the shape of the apertura amphidialis, no interdigitation of body annuli at level of lateral alae, presence of eight longitudinal rows of somatic setae, and conspicuous pre-cloacal supplements consisting of star-shaped projections flanked by two cuticularised pieces. Pseudodesmodora lacrima n. sp. is characterised by the presence of large unispiral amphids on amphidial plates, conspicuous ducts in the head region, low a values, and short cephalic setae.

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Description of Pseudosteineria longisetis sp. n. from northeastern Brazil with a review of the genus Pseudosteineria Wieser, 1956 (Nematoda: Xyalidae)

Zootaxa ◽

10.11646/zootaxa.4763.3.2 ◽

2020 ◽

Vol 4763 (3) ◽

pp. 354-370

Author(s):

GABRIEL CIDREIRA ◽

VIRÁG VENEKEY ◽

ORANE F. DE SOUZA ALVES ◽

FRANCISCO KELMO

Keyword(s):

The Body ◽

Identification Key ◽

Northeastern Brazil ◽

Marine Nematode ◽

Free Living ◽

The Family ◽

Emended Diagnosis

A new free-living marine nematode of the family Xyalidae is described from Armação Beach, northeastern Brazil, and the genus Pseudosteineria is reviewed. Pseudosteineria longisetis sp. n. is characterized by having six groups of long subcephalic setae, amphids situated slightly anterior to the groups of subcephalic setae or at the level of the first subcephalic setae, long somatic setae located posteriorly to subcephalic setae and distributed along the body, one papiliform precloacal supplement, and gubernaculum with dorso-caudal apophysis. An emended diagnosis of the genus, an updated list of species and dichotomous identification key, and a pictorial key are given. A comparative table including the main characters of all Pseudosteineria species is also provided.

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Four new free-living marine nematode species (Sabatieria) from the Chukchi Sea

Zootaxa ◽

10.11646/zootaxa.4646.1.2 ◽

2019 ◽

Vol 4646 (1) ◽

pp. 31-54

Author(s):

PEIPEI YANG ◽

YUQING GUO ◽

YUZHEN CHEN ◽

RONGCHENG LIN

Keyword(s):

Chukchi Sea ◽

Nematode Species ◽

Marine Nematode ◽

Free Living ◽

Head Diameter ◽

Body Diameter

Four new free-living marine nematode species of the genus Sabatieria are described from the Chukchi Sea. Sabatieria chukchensis sp. n. is characterized by a long body (2052–2326 μm), two pairs of short cervical setae present, amphideal fovea spiral with 2.75–3.25 turns, and seven papilliform pre-cloacal supplements. Sabatieria parvamphis sp. n. is characterized by small amphideal fovea (equal to 55–72% corresponding body diameter), amphideal fovea spiral with 3.25 turns, short cephalic setae (6–7 μm, equal to 31–38% of head diameter), curved gubernacular apophyses, thirteen to fifteen prominent tubular pre-cloacal supplements with distance between adjacent supplements increasing towards the anterior. Sabatieria major sp. n. is characterized by a long body (3879–4255 μm), amphideal fovea spiral with 2.5–3.25 turns, and seventeen to thirty-two small tubular pre-cloacal supplements. Sabatieria multisupplementia sp. n. is characterized by a long body (3967–4294 μm), amphideal fovea spiral with 2.75–3 turns, and forty-one to forty-seven tubular pre-cloacal supplements.

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