scholarly journals Guitartia tridentata n. gen., n. sp. (Monhysterida: Xyalidae) and Macrodontium gaspari n. gen., n. sp. (Chromadorida: Microlaimidae), free-living marine nematodes from the Caribbean Sea

Nematology ◽  
2010 ◽  
Vol 12 (3) ◽  
pp. 417-427 ◽  
Author(s):  
Maickel Armenteros ◽  
Wilfrida Decraemer ◽  
Magda Vincx
Keyword(s):  
Sexual Dimorphism ◽  
Type Species ◽  
Relative Size ◽  
Relative Length ◽  
Caribbean Sea ◽  
The Body ◽  
Marine Nematodes ◽  
Free Living ◽  
Body Cuticle ◽  
Amphidial Fovea

AbstractTwo new genera of free-living marine nematodes are described from the muddy bottom of Cienfuegos Bay, Caribbean Sea. Guitartia n. gen. (Xyalidae, Monhysterida) is characterised by three long tooth-like structures in the stegostom, second and third circle of anterior sensilla separate and posterior genital branch of the female restricted to a long post-vulvar sac. The type species is Guitartia tridentata n. gen., n. sp. Within the Xyalidae, Guitartia n. gen. is morphologically close to Amphimonhystrella, Cobbia, Elzalia, Scaptrella and Valvaelaimus, all being characterised by sclerotised structures in the stoma and transverse striation of the body cuticle. Main features for discrimination are the type of stoma structure, the shape and relative size of amphidial fovea, the presence of a post-vulvar sac and gubernacular apophyses and the absence of terminal setae on the tail. Macrodontium n. gen. (Microlaimidae, Chromadorida) is characterised by a heavily sclerotised stoma with one large dorsal tooth and two smaller subventral teeth, sexual dimorphism in size and position of the amphidial fovea and males with a single anterior testis. The type species is Macrodontium gaspari n. gen., n. sp. Within the Microlaimidae, Macrodontium n. gen. is similar to the genera Acanthomicrolaimus and Bolbolaimus due to sclerotised stoma and presence of large dorsal tooth. The new genus is similar to Aponema in sexual dimorphism in the size of the amphidial fovea, monorchic males, presence of a gubernacular apophysis and conico-cylindrical tail shape. Morphological characters of diagnostic value within the family are the ornamentation of the body cuticle, relative length of cephalic sensilla, stoma sclerotisation and number of testes.

Acanthochondria helicoleni sp. nov. (Copepoda, Chondracanthidae) parasitic on Helicolenus lahillei (Scorpaeniformes, Sebastidae) from Argentinean waters

2010 ◽  
Vol 55 (4) ◽  
Author(s):  
Delfina Cantatore ◽  
Juan Timi
Keyword(s):  
New Species ◽  
Relative Size ◽  
Relative Length ◽  
Parasitic Copepod ◽  
The Body ◽  
Head Shape ◽  
A New Species ◽  
Shape And Size

AbstractA new species of a parasitic copepod, Acanthochondria helicoleni sp. nov. (Copepoda, Chondracanthidae), is described and illustrated from specimens collected within the branchial chambers of the rubio, Helicolenus lahillei Norman, 1937, from the Argentinean waters. The new species most closely resemble A. serrani Braicovich et Timi, 2009 collected in the same region, but differs in the general measurements and proportions of the body; primarily by the relative length of neck, shape of head, shape and size of genito-abdominal tagma and relative size of the trunk postero-lateral processes.

Four new species and an identification key for Stygodesmodora Blome, 1982 (Nematoda: Spiriniinae) from the continental shelf off northeastern Brazil 

Zootaxa ◽  
2017 ◽  
Vol 4294 (1) ◽  
pp. 46
Author(s):  
ALEXANDRE L. LARRAZÁBAL-FILHO ◽  
PATRÍCIA F. NERES ◽  
ANDRÉ M. ESTEVES
Keyword(s):  
New Species ◽  
Sexual Dimorphism ◽  
Continental Shelf ◽  
The Body ◽  
Identification Key ◽  
Northeastern Brazil ◽  
Marine Nematodes ◽  
Undescribed Species ◽  
Potiguar Basin

Four previously undescribed species of marine nematodes were collected on the continental shelf of the Potiguar Basin in northeastern Brazil. Stygodesmodora amphidialis sp. n. has a large fovea amphidialis, long cephalic setae, globular spermatic cells, 6–8 tubular supplements and button-like caudal papillae. Stygodesmodora paramphidialis sp. n. is similar but can be differentiated by the presence of a bipartite lumen and a fovea amphidialis smaller than in S. amphidialis sp. n. Stygodesmodora robusta sp. n. has a relatively robust body, strongly annulated cuticle, one large dorsal tooth and a small ventral tooth, one row of nine ventrally placed precloacal setae, and arched spicules. Stygodesmodora potiguensis sp. n. has the cuticle strongly annulated, many setae along the body, supplements absent, and sexual dimorphism in the size of the fovea amphidialis. These four new species increase to seven the number of taxa known in the genus. 

scholarly journals New species ofEpacanthion(Nematoda: Thoracostomopsidae) from Patagonia coast, Río Negro and Chubut, Argentina

2012 ◽  
Vol 93 (4) ◽  
pp. 925-934 ◽  
Author(s):  
V. Lo Russo ◽  
G. Villares ◽  
A. Martelli ◽  
C.T. Pastor de Ward ◽  
C. Harguinteguy
Keyword(s):  
New Species ◽  
Coastal Areas ◽  
The Body ◽  
Cervical Region ◽  
Marine Nematodes ◽  
Free Living ◽  
Rio Negro ◽  
Body Diameter ◽  
The Family ◽  
Short Spicule

Two new free-living marine nematodes belonging to the family Thoracostomopsidae, subfamily Enoplolaiminae and the generaEpacanthionare described from Patagonian coastal areas, Río Negro and Chubut provinces of Argentina. InEpacanthion bicuspidatumsp. nov. the main features are: two cusps on distal mandible end; presence of two rings of eight setae in the cervical region; and eight crown-shaped setae along the body, presence of one supplement distant two cloacal body diameter (cbd) from cloacae, gubernaculum and short spicule.Epacanthion ampullatumsp. nov. is characterized by having a tubular and long pre-cloacal supplement, short spicule, presence of gubernaculum, presence of three long setae on the tip of the tail, the presence of one supplement distant three cbd from cloacae and the presence of two small cusps on the distal end of the mandible.

scholarly journals A redescription of deep-channel ghost knifefish, Sternarchogiton preto (Gymnotiformes: Apteronotidae), with assignment to a new genus

2020 ◽  
Vol 18 (1) ◽  
Author(s):  
Maxwell J. Bernt ◽  
Aaron H. Fronk ◽  
Kory M. Evans ◽  
James S. Albert
Keyword(s):  
Sexual Dimorphism ◽  
Body Surface ◽  
Type Species ◽  
New Genus ◽  
Phylogenetic Analyses ◽  
The Body ◽  
The Other ◽  
Valid Species ◽  
Deep Channel ◽  
Secondary Sexual Dimorphism

ABSTRACT From a study of morphological and molecular datasets we determine that a species originally described as Sternarchogiton preto does not form a monophyletic group with the other valid species of Sternarchogiton including the type species, S. nattereri. Previously-published phylogenetic analyses indicate that this species is sister to a diverse clade comprised of six described apteronotid genera. We therefore place it into a new genus diagnosed by the presence of three cranial fontanels, first and second infraorbital bones independent (not fused), the absence of an ascending process on the endopterygoid, and dark brown to black pigments over the body surface and fins membranes. We additionally provide a redescription of this enigmatic species with an emphasis on its osteology, and provide the first documentation of secondary sexual dimorphism in this species.

Four new species of free-living nematodes from shallow continental shelf of Portugal

Zootaxa ◽  
2020 ◽  
Vol 4722 (1) ◽  
pp. 1-33
Author(s):  
TACIANA KRAMER PINTO ◽  
PATRICIA FERNANDES NERES
Keyword(s):  
Continental Shelf ◽  
Buccal Cavity ◽  
Marine Biodiversity ◽  
Main Character ◽  
Marine Nematodes ◽  
Cavity Size ◽  
Free Living ◽  
System Project ◽  
Amphidial Fovea ◽  
Biodiversity Information

Free-living marine nematodes of continental shelf of Portugal were studied through the goals of the Marine Biodiversity Information System Project (M@rbis 2015). Four species unknown to science and belonging to the families Axonolaimidae, Chromadoridae, Desmodoridae and Xyalidae are described. Besides Hypodontolaimus golikovy, Hypodontolaimus portuguese sp. n. is the only species in this genus which lacks precloacal supplements and gubernaculum but differs from the former mainly in cephalic setae length and amphidial fovea features. Metachromadora aliusa sp. n. doesn’t have a unique diagnostic character, differing in many aspects from the other species of the genus instead, mainly teeth number in the buccal cavity, size of the cephalic setae and the amphidial fovea, velum presence in the spicules, number and shape of the precloacal supplements. The main character of Odontophora sinapophysis sp. n. is the absence of apophysis in the gubernaculum. Stylotheristus multipapillatus sp. n. is characterized by the presence of precloacal supplements (papilliform) and the gubernaculum formed by only a piece. 

A new genus and new species of free-living marine nematodes from the Yellow Sea, China

2007 ◽  
Vol 87 (3) ◽  
pp. 717-722 ◽  
Author(s):  
Yong Huang ◽  
Zhinan Zhang
Keyword(s):  
New Species ◽  
Yellow Sea ◽  
Type Species ◽  
New Genus ◽  
The Yellow Sea ◽  
Marine Nematodes ◽  
Free Living ◽  
One New Species

A new genus and one new species of free-living marine nematodes Paramarylynnia gen. nov., Paramarylynnia subventrosetata sp. nov. from the Yellow Sea, China are described and illustrated. Paramarylynnia gen. nov. is characterized by a cuticle with transverse rows of even dots; absence of lateral differentiation; gubernaculum large and dilated at the distal end, no distal dentation; precloacal supplements absent; tail conico-cylindrical.The type species of Paramarylynnia gen. nov. is Paramarylynnia subventrosetata sp. nov.

scholarly journals Biodiversity patterns of free-living marine nematodes in a tropical bay: Cienfuegos, Caribbean Sea

2009 ◽  
Vol 85 (2) ◽  
pp. 179-189 ◽  
Author(s):  
M. Armenteros ◽  
A. Ruiz-Abierno ◽  
R. Fernández-Garcés ◽  
J.A. Pérez-García ◽  
L. Díaz-Asencio ◽  
...  
Keyword(s):  
Caribbean Sea ◽  
Marine Nematodes ◽  
Free Living ◽  
Biodiversity Patterns ◽  
Tropical Bay

A new species of Tethycometes Sara 1994 (Porifera: Hadromerida: Tethyidae) from Singapore

Zootaxa ◽  
2008 ◽  
Vol 1841 (1) ◽  
pp. 65
Author(s):  
SWEE CHENG LIM ◽  
KOH SIANG TAN
Keyword(s):  
New Species ◽  
Type Species ◽  
Relative Length ◽  
The Body ◽  
Andaman Islands ◽  
Island Southeast Asia ◽  
Short Stalk ◽  
Basal Half ◽  
The Tropics ◽  
A New Species

Eight species of stalked tethyids have been described previously from the tropics (Sarà & Burlando, 1994; Van Soest et al., 2005; Sarà, 2002). These stalked species are now placed in three genera, namely, Halicometes Topsent, 1898, Burtonitethya Sarà, 1994, and Tethycometes Sarà, 1994. The three genera are distinguished principally on the relative length of the stalk in relation to the size of the hemispherical body which is attached to one end of the stalk (Sarà, 1994, 2002; Sarà & Burlando, 1994). Members of the genus Halicometes have stalks between two and four times the length of the body. Six species have been described from depths of 150–2100 m in the Atlantic and Indo-Pacific regions (Sarà, 2002). In contrast, the monotypic Burtonitethya is characterized by a short stalk that is only as long as the subspherical body. The type species B. gemmiformis Sarà, 1994 was described from the Andaman Islands from an unknown depth (Sarà, 1994, 2002). More recently, specimens collected off Java in 1900 at a depth of 82 m and possessing a long stalk eight times the length of the ovoid body were designated as type species for Tethycometes (see Sarà, 1994, 2002). This paper describes a new species of Tethycometes dredged from waters less than 15 m deep off the coast of Singapore Island, Southeast Asia. With a long stalk eight times the length of its ovoid body, it is the second species to be assigned to the recently erected genus Tethycometes. It differs from the type species T. sibogae Sarà, 1994 in the presence of oxyspherasters which form a thin but distinct cortex. It also differs from all other stalked tethyids in having a partially detached tangential skeleton surrounding the stalk, as well as in possessing rooting processes emanating from the basal half of the stalk.

Four new species of free-living marine nematodes of the family Comesomatidae (Nematoda: Araeolaimida) from coast of Vietnam

Zootaxa ◽  
2013 ◽  
Vol 3608 (7) ◽  
pp. 547-560 ◽  
Author(s):  
VLADIMIR G. GAGARIN
Keyword(s):  
New Species ◽  
Littoral Zone ◽  
Nematode Species ◽  
Valid Species ◽  
Marine Nematodes ◽  
Free Living ◽  
The Family ◽  
Coast Of Vietnam ◽  
Amphidial Fovea

Specimens of four new nematode species of the family Comesomatidae were isolated from the sediments of littoral zone of South China Sea at the coast of Vietnam and described and illustrated. Sabatieria curvispiculata sp. n. is characterized by the long and slender tail, short cephalic setae and strongly curved spicules in males. Setosabatiera orientalis sp. n. is close to S. australis Riera, Nunez, Brito, 2006, but differs from it in the comparatively shorter and more slender tail, small-er number of amphidial fovea turns, greater number of precloacal supplements in males and shape and structure of spic-ules. Dorylaimopsis intermedia sp. n. is morphologically closest to D. mediterranea Grimaldi-de Zio, 1968 and D. magellanense Chen, Vincx, 1968, but differs from both species in the longer outer labial setae and absence of precloacal supplements in males. D. brevispiculata sp. n. is similar to D. turneri Zhang, 1992 and D. coomansi Muthumbi, Soetaert, Vincx, 1977, but differs from both species in the shape of outer labial sensillae and absence of precloacal supplements in males. A pictorial key for determination of valid species in the genus Setosabatieria Rouville, 1903 is given.

Sign in / Sign up

Export Citation Format

Share Document