54 research outputs found
Trophomera senckenbergi Miljutin & Miljutina, 2009, sp. n.
No full textTrophomera senckenbergi sp. n. Fig. 8; Table 2 Type material: Holotype: one virgin female, collection number MNHN-BN497. Type locality: 14°02.55’N, 130°05.35’W, 5035 m depth, 31.05.2004, multicorer #8, corer #2. Etymology: In honour of Senckenberg Research Institute (Germany). Description: Female known only. Body slightly fusiform, with thickest body part at first half of body. Anterior and posterior ends in shape of a cone with rounded tip. Cuticular, very thin, transverse, striation along whole body length being hardly visible except at caudal region. Cuticle thickness 1.5 µm at anterior tip and approximately 1 µm in rest body parts. Amphids located at 0.88 c.b.d. from anterior end; amphidial apertures pore-like, 1.5 µm in diameter. Four submedian, papilloid, cephalic setae 2 µm long inserted in tiny pits. Mouth opening reduced to a narrow, apical channel in cuticle. Pharynx looking like a non-muscular string devoid of an internal lumen. Cardia absent. Midgut an oligocellular trophosome without visible internal lumen and consisting of one row of big cells in longitudinal optical section. Borders between trophosomal cells distinct. Anus and rectum present. Female reproductive system didelphic, amphidelphic. Ovaries outstretched or hologonic (non-reflected) in single virgin specimen. No spermathecae nor sperm observed. Hyaline ring representing a circular vaginal sphincter visible around vagina. Caudal glands absent. Host unknown. Males, juvenile stages unknown. Differential diagnosis: The female of Trophomera senckenbergi sp. n. is characterized by a non-reflected ovary (it is impossible to clarify the certain construction because of immaturity of the type specimen). There are only five described Trophomera species, which have non-reflected ovaries: T. megala (Petter, 1987) and T. turpicauda Miljutin, 2004 possessing hologonic ovaries, as well as T. laubieri (Petter, 1987), T. pacifica sp. n. and T. pseudominuta Miljutin, 2004 possessing telogonic outstretched ovaries. T. senckenbergi sp. n. differs from T. megala by its shorter body length (1.5 mm vs. 65–170 mm), body shape (fusiform vs. cylindrical), design of trophosome (oligocellular vs. multicellular), and its tail shape (conical with rounded tip vs. rounded with long terminal spine). T. senckenbergi sp. n. differs from T. turpicauda by its shorter body length (1.5 mm vs. 3.4–6.1 mm), the body shape (fusiform vs. cylindrical), and its tail shape (conical with rounded tip vs. rounded with terminal, cuticular process of irregular shape). T. senckenbergi sp. n. differs from T. laubieri and T. pacifica by its shorter body length (1.5 mm vs. 5.2–6.4 mm), the body shape (fusiform vs. cylindrical), and its tail shape (conical with rounded tip vs. conical with an edged elongated tip). T. senckenbergi sp. n. differs from T. pseudominuta by its shorter body length (1.5 mm vs. 2.8 mm), its longer tail (c = 44.6 vs. 86.9), and its tail shape (conical with rounded tip vs. rounded). Remarks: The ovary of T. senckenbergi sp.n. is probably non-reflected. The reflected structure of ovaries is usually clearly visible even in virgin specimens (e.g. in T. tchesunovi (Miljutin, 2004) or in T. petterae (Miljutin, 2004)), whereas the structure of ovaries of virgin female of T. turpicauda (possessing a hologonic ovaries) was clearly non-reflected.Published as part of Miljutin, Dmitry M. & Miljutina, Maria A., 2009, Description of Bathynema nodinauti gen. n., sp. n. and four new Trophomera species (Nematoda: Benthimermithidae) from the Clarion-Clipperton Fracture Zone (Eastern Tropic Pacific), supplemented with the keys to genera and species *, pp. 173-196 in Zootaxa 2096 (1) on pages 187-189, DOI: 10.11646/zootaxa.2096.1.11, http://zenodo.org/record/532211
Trophomera pacifica Miljutin & Miljutina, 2009, sp. n.
No full textTrophomera pacifica sp. n. Figs 6–7; Table 2 Type material: Holotype: one gravid female, collection number MNHN-BN496. Type locality: Polymetallic nodule area, 14°02.52’N, 130°07.98’W, 4950 m depth, 07.06.2004, multicorer #18, corer #2. Etymology: “ Pacifica ” means “from the Pacific Ocean”. Description: Female. Body cylindrical, with thickest body part at anterior half of body. Anterior end rounded, posterior end conical, with thick conical terminal spine 81 µm long, showing granular core. Cuticle with very thin and hardly visible transverse striations along whole body length; striations being more pronounced at caudal region. Cuticle thickness 5.5 µm at anterior tip, 4 µm at level of amphids, and 3 µm in the rest of the body parts. Amphids located at 0.86 c.b.d. from anterior end; amphidial apertures pore-like, 1 µm in diameter. Four submedian cephalic setae 2.5 µm long inserted in tiny pits. Somatic sensilla in shape of small papillae 1–1.5 µm long arranged in 4 longitudinal lateromedian rows from postamphidial region to anal region. Mouth opening reduced to a thin channel in cuticle. Pharynx a non-muscular string devoid of an internal lumen. Several large hyaline cells situated at posterior pharynx. Cardia absent. Midgut an oligocellular trophosome without visible internal lumen and obviously consisting of 1 row of cells. Borders between trophosomal cells distinct. Rectum reduced to an indistinctly visible tube. Female reproductive system didelphic, amphidelphic, occupying approximately 2/3 body length in the gravid specimen. Ovaries outstretched, 530 µm long in anterior branch, 715 µm in posterior branch. Oviducts very short. Uterus very long, occupying approximately 3/5 body length. Mature eggs 34x20 µm in diameter situated in one row in uterus except vulva region. Neither morphologically differentiated spermatheca nor spermatozoa observed. Vulvar glands present. Caudal glands absent. Host unknown. Male, juvenile stages unknown. Differential diagnosis: The female of T. pacifica sp. n. possesses outstretched ovaries. Only three Trophomera species have outstretched ovaries: T. laubieri (Petter 1987), T. pseudominuta (Miljutin 2004), and, possibly, T. senckenbergi sp. n. T. pacifica sp. n. differs from T. pseudominuta by its larger body length (5.4 mm vs. 2.8 mm), and its tail shape (long conical spine vs. rounded). T. pacifica sp. n. differs from T. senckenbergi sp. n. by its larger body length (5.4 mm vs. 1.5 mm), and its tail shape (long conical spine vs. cone-shaped with rounded tip). In its general appearance, T. pacifica sp. n. strongly resembles T. laubieri. It differs from T. laubieri by: presence of a granular core inside the caudal terminal spine; a thickened cuticle at the cephalic apex; a difference in the ratio “distance from anterior end to amphid / c.b.d.” (0.86 vs. 0.72); trophosome structure (one row of cells at the longitudinal optical section vs. several rows); a longer female reproductive system (occupying approximately 0.7 body length vs. 0.45–0.50); egg size (34x20 µm vs. from 38x38 to 40x40 µm); and a different egg layout inside oviduct (only one row of eggs vs. several ones).Published as part of Miljutin, Dmitry M. & Miljutina, Maria A., 2009, Description of Bathynema nodinauti gen. n., sp. n. and four new Trophomera species (Nematoda: Benthimermithidae) from the Clarion-Clipperton Fracture Zone (Eastern Tropic Pacific), supplemented with the keys to genera and species *, pp. 173-196 in Zootaxa 2096 (1) on pages 183-187, DOI: 10.11646/zootaxa.2096.1.11, http://zenodo.org/record/532211
Cyathoshiva amaleshi gen. n. sp. n. (Nematoda: Cyatholaimidae) from the coast of India
No full textDatta, Tridip Kumar, Miljutin, Dmitry M., Chakraborty, Susanta Kumar, Mohapatra, Anil (2016): Cyathoshiva amaleshi gen. n. sp. n. (Nematoda: Cyatholaimidae) from the coast of India. Zootaxa 4126 (4): 577-586, DOI: 10.11646/zootaxa.4126.4.
Trophomera minutissima Miljutin & Miljutina, 2009, sp. n.
No full textTrophomera minutissima sp. n. Fig. 5; Table 2 Type material: Holotype: one gravid female, collection number MNHN-BN495. Type locality: 14°02.86’N, 130°05.35’W, 5040 m depth, 30.05.2004, multicorer #6, corer #2. Etymology: From Latin minutissima (smallest). Description: Female. Body cylindrical, with thickest body part at anterior half of body; anterior and posterior ends rounded. Transverse cuticular striation along whole body length hardly discernable using light microscope. Cuticle thickness 2.5 µm at anterior tip, 1.5 µm at mid-body region, and 3 µm at posterior tip. Amphidial apertures pore-like, 1 µm in diameter, located in 0.81 c.b.d. from anterior and. Amphidial fovea 3 µm in diameter visible under cuticle. Four submedian, setiform papillae 1.5 µm long. Mouth opening absent. Pharynx a non-muscular string devoid of an internal lumen. Cardia absent. Midgut, an oligocellular trophosome without visible internal lumen and obviously consisting of 1 row of cells. Numerous big, hyaline granules within trophosomal cells. Borders between trophosomal cells distinct. Anus and rectum present. Female reproductive system didelphic, amphidelphic, occupying approximately 1/3 body length. Ovaries reflected, 100–110 µm long, containing several tens of oocytes. Neither spermatheca, nor spermatozoa, nor vulvar glands observed. Hyaline ring representing a circular vaginal sphincter visible around vagina. Mature eggs in oviducts and uterus approximately 17 µm in diameter. Caudal glands absent. Host unknown. Male, juvenile stages unknown. Differential diagnosis: The female of Trophomera minutissima sp. n. shows resemblance to females of T. bathycola (Rubtzov, 1980), T. edouardensis (Petter, 1983) (Petter 1983b), and T. minuta (Petter, 1987) by its reflected ovary and rounded tail without any process but differs from these species by its shorter body (0.9 mm vs. 2.3, 4.1, and 9.4 mm respectively). It is the smallest species in the genus Trophomera.Published as part of Miljutin, Dmitry M. & Miljutina, Maria A., 2009, Description of Bathynema nodinauti gen. n., sp. n. and four new Trophomera species (Nematoda: Benthimermithidae) from the Clarion-Clipperton Fracture Zone (Eastern Tropic Pacific), supplemented with the keys to genera and species *, pp. 173-196 in Zootaxa 2096 (1) on page 183, DOI: 10.11646/zootaxa.2096.1.11, http://zenodo.org/record/532211
FIGURE 10 in Deep-sea nematodes of the family Microlaimidae from the Clarion-Clipperton Fracture Zone (North-Eastern Tropic Pacific), with the descriptions of three new species*
No full textFIGURE 10. Microlaimus abyssalis sp. n., males. A, paratype No. 1, head; B, paratype No. 2, tail. Scale bars = 20 µm.Published as part of <i>Miljutin, Dmitry M. & Miljutina, Maria A., 2009, Deep-sea nematodes of the family Microlaimidae from the Clarion-Clipperton Fracture Zone (North-Eastern Tropic Pacific), with the descriptions of three new species*, pp. 137-172 in Zootaxa 2096 (1)</i> on page 153, DOI: 10.11646/zootaxa.2096.1.11, <a href="http://zenodo.org/record/10093216">http://zenodo.org/record/10093216</a>
Benthimermithidae Petter 1980
No full textKey to Benthimermithidae genera 1 Pharynx possessing distinct axial internal lumen over most of its length ........................................ Bathynema gen. n. - Pharynx devoid of distinct internal lumen.................................................................................................................... 2 2 In females, numerous multicellular glands associated with oviducts present ...................... Adenodelphis Petter, 1983 - In females, multicellular glands absent on oviducts ...................................... Trophomera Rubtzov & Platonova, 1974 [= Benthimermis Petter, 1980; = Abos Rubtzov, 1980 (last revision: Miljutin 2006)]Published as part of Miljutin, Dmitry M. & Miljutina, Maria A., 2009, Description of Bathynema nodinauti gen. n., sp. n. and four new Trophomera species (Nematoda: Benthimermithidae) from the Clarion-Clipperton Fracture Zone (Eastern Tropic Pacific), supplemented with the keys to genera and species *, pp. 173-196 in Zootaxa 2096 (1) on page 175, DOI: 10.11646/zootaxa.2096.1.11, http://zenodo.org/record/532211
FIGURE 17 in Deep-sea nematodes of the family Microlaimidae from the Clarion-Clipperton Fracture Zone (North-Eastern Tropic Pacific), with the descriptions of three new species*
No full textFIGURE 17. Microlaimus parviporosus sp. n., male, holotype. A, anterior end; B, total view; C, posterior end. Scale bars: A, C = 20 µm; B = 50 µm.Published as part of <i>Miljutin, Dmitry M. & Miljutina, Maria A., 2009, Deep-sea nematodes of the family Microlaimidae from the Clarion-Clipperton Fracture Zone (North-Eastern Tropic Pacific), with the descriptions of three new species*, pp. 137-172 in Zootaxa 2096 (1)</i> on page 164, DOI: 10.11646/zootaxa.2096.1.11, <a href="http://zenodo.org/record/10093216">http://zenodo.org/record/10093216</a>
FIGURE 6 in Deep-sea nematodes of the family Microlaimidae from the Clarion-Clipperton Fracture Zone (North-Eastern Tropic Pacific), with the descriptions of three new species*
No full textFIGURE 6. Caligocanna mirabilis, female, specimen No. 7, a total view. Scale bar = 50 µm.Published as part of <i>Miljutin, Dmitry M. & Miljutina, Maria A., 2009, Deep-sea nematodes of the family Microlaimidae from the Clarion-Clipperton Fracture Zone (North-Eastern Tropic Pacific), with the descriptions of three new species*, pp. 137-172 in Zootaxa 2096 (1)</i> on page 148, DOI: 10.11646/zootaxa.2096.1.11, <a href="http://zenodo.org/record/10093216">http://zenodo.org/record/10093216</a>
FIGURE 9 in Deep-sea nematodes of the family Microlaimidae from the Clarion-Clipperton Fracture Zone (North-Eastern Tropic Pacific), with the descriptions of three new species*
No full textFIGURE 9. Microlaimus abyssalis sp. n., male, holotype. A, head; B, tail; C, total view. Scale bars: A, B = 20 µm; C = 100 µm.Published as part of <i>Miljutin, Dmitry M. & Miljutina, Maria A., 2009, Deep-sea nematodes of the family Microlaimidae from the Clarion-Clipperton Fracture Zone (North-Eastern Tropic Pacific), with the descriptions of three new species*, pp. 137-172 in Zootaxa 2096 (1)</i> on page 152, DOI: 10.11646/zootaxa.2096.1.11, <a href="http://zenodo.org/record/10093216">http://zenodo.org/record/10093216</a>
FIGURE 5. Caligocanna mirabilis, males. A in Deep-sea nematodes of the family Microlaimidae from the Clarion-Clipperton Fracture Zone (North-Eastern Tropic Pacific), with the descriptions of three new species*
No full textFIGURE 5. Caligocanna mirabilis, males. A, specimen No. 1, head; B, specimen No. 1, anterior end; C, specimen No. 1, total view; D, specimen No. 3, copulatory apparatus. Scale bars: A, B = 20 µm; C = 100 µm; D = 10 µm.Published as part of <i>Miljutin, Dmitry M. & Miljutina, Maria A., 2009, Deep-sea nematodes of the family Microlaimidae from the Clarion-Clipperton Fracture Zone (North-Eastern Tropic Pacific), with the descriptions of three new species*, pp. 137-172 in Zootaxa 2096 (1)</i> on page 147, DOI: 10.11646/zootaxa.2096.1.11, <a href="http://zenodo.org/record/10093216">http://zenodo.org/record/10093216</a>
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