60 research outputs found
Three new free-living marine nematode species of Dorylaimopsis (Nematoda Araeolaimida: Comesomatidae) from the South China Sea and the Chukchi Sea
No full textFu, Sujing, Leduc, Daniel, Rao, Yiyong, Cai, Lizhe (2019): Three new free-living marine nematode species of Dorylaimopsis (Nematoda Araeolaimida: Comesomatidae) from the South China Sea and the Chukchi Sea. Zootaxa 4608 (3): 433-450, DOI: 10.11646/zootaxa.4608.3.
Dorylaimopsis jinyuei Fu & Leduc & Rao & Cai 2019, sp. n.
No full textDorylaimopsis jinyuei sp. n. (Figures 7–9, Table 3) Material examined. Type specimens. Holotype male, inventory slide no. ChukchiC0431. The habitat and locality. Sublittoral zone in the Chukchi Sea (Arctic Ocean). Collected in July 2014, 169°01′ W, 67°40′ N, water depth 50 m, salinity 32.77‰; 168°09′ W, 69°13′ N, water depth 50 m, salinity 32.75‰; 169°00′ W, 69°36′ N, water depth 52 m, salinity 32.63‰; 166°59′ W, 71°00′ N, water depth 45 m, salinity 30.64‰; surface sediment layer (0–10 cm), muddy sediment. Male inventory slide no. ChukchiC0431, ChukchiC01, ChukchiB14 and ChukchiR02. Female inventory slide no. ChukchiR04 and ChukchiC01. Etymology. This species was named after the second son of the first author Sujing Fu. Description. Male. Body cylindrical, widest at anterior intestine region, gradually tapering towards both extremities. Cuticle with transverse rows of fine punctuations, with lateral differentiation in the form of 4–7 longitudinal rows of coarse dots extending from posterior edge of amphid to anterior of intestine, and 5–7 longitudinal rows of coarse dots in the conical tail region, not as regular as in pharyngeal region; longitudinal rows of coarse dots absent in middle body. Cephalic region with a distinct constriction. Two circles of six inner labial and six outer labial papillae, four cephalic setae situated at level of constriction. Buccal cavity consists of two portions, a cup-shaped anterior portion and a cuticularized tubular posterior portion. Three triangular teeth present at the anterior end of tubular part of buccal cavity. Amphids spiral, 2.75 turns, anterior border of amphids at level of cephalic setae. Pharynx cylindrical, widening slightly towards posterior end. Nerve ring near middle of pharynx. The ventral gland situated posterior to the cardia level, the excretory pore opens near half of pharyngeal length. Cardia small. Reproductive system diorchic with two outstretched testes, anterior testis to the right and posterior testis to the left of the intestine. Spicules equal and curved, 1.9–2.5 cloacal body diameters long, with a strong developed capitulum, and proximally with a short central lamina. Gubernaculum with paired dorsocaudal apophyses. Fifteen to twenty fine tubular precloacal supplement present which are often difficult to distinguish. Tail conico-cylindrical, several short caudal setae and three terminal setae. Three caudal glands and distinct spinneret present. Female. Similar to males. Some female specimens like males in the pattern of lateral differentiation. But the other females with longitudinal rows of coarse dots beginning from posterior edge of amphid with 4–7 rows extending to anterior border of pharyngeal bulb, the longitudinal rows disappear in the middle body, then reappear with 5–7 rows in the tail region, longitudinal rows in the tail region are not as regular as in pharyngeal region. Reproductive system didelphic, opposed, outstretched, with anterior ovary situated on the left of intestine, posterior ovary on the right side of intestine. Vulva at pre-median of body length. Granular vaginal glands present. Spermatheca present, often with numerous spermatozoa. Three caudal glands and distinct spinneret present. Diagnosis and relationships. Dorylaimopsis jinyuei sp. n. is characterized by cuticle with lateral differentiation in the form of longitudinal rows of larger dots in two separate regions, not along entire body. One region is from posterior edge of amphid with 4–7 rows extending to anterior of intestine, the other is tail region with 5–7 rows. But in some females longitudinal rows of larger dots are distributed from posterior edge of amphid to anterior border of pharyngeal bulb (4–7 longitudinal rows), then reappear in the tail region with 5–7 rows. Amphideal fovea with 2.75 turns and spicules 127–151 μm long with a strongly developed capitulum, and proximally with a short central lamina. Fifteen to twenty fine tubular precloacal supplements present. Dorylaimopsis jinyuei sp. n. resembles D. coomansi Muthumbi et al., 1997 and D. turneri Zhang, 1992 in the cuticle with lateral longitudinal rows of coarse dots not along entire body, and in the spicules with cephalated proximal end. Dorylaimopsis jinyuei sp. n. differs from the latter species by the different distribution of longtitudinal rows of coarse dots; D. jinyuei sp. n. has lateral longitudinal rows of coarse dots in two regions, one is from posterior edge of amphid to anterior of intestine region or to the anterior border of pharyngeal bulb in some females, the other is the tail region, but in D. coomansi and D. turneri the lateral longitudinal rows of coarse dots begin posteriorly to the pharyngeal region and end at the cloaca/anus. Dorylaimopsis jinyuei sp. n. also differs from D. coomansi by the shape of the gubernacular apophyses, which are distinctly swollen distally in D. coomansi, and not swollen in D. jinyuei sp. n. Dorylaimopsis jinyuei sp. n. differs from D. turneri by its much longer spicules (127–151 μm vs 57–67 μm in D. turneri) and spicules with small central lamina in the new species. Dorylaimopsis jinyuei sp. n. resembles D. papilla Guo et al., 2018 in the spicules with cephalated proximal end and with small central lamina. However, D. jinyuei sp. n. differs from the latter in the ratio of the conical portion of the tail to total tail length (2/ 3 in D. jinyuei sp. n. vs 1/ 2 in D. papilla), and D. papilla has lateral differentiation of two longitudinal rows in the middle region of body which is different from D. jinyuei sp. n.Published as part of Fu, Sujing, Leduc, Daniel, Rao, Yiyong & Cai, Lizhe, 2019, Three new free-living marine nematode species of Dorylaimopsis (Nematoda Araeolaimida: Comesomatidae) from the South China Sea and the Chukchi Sea, pp. 433-450 in Zootaxa 4608 (3) on pages 443-446, DOI: 10.11646/zootaxa.4608.3.2, http://zenodo.org/record/306669
Dorylaimopsinae De Coninck 1965
No full textSubfamily Dorylaimopsinae De Coninck, 1965 Type genus: Dorylaimopsis Ditlevsen, 1918 Diagnosis (from Fonseca & Bezerra 2014). Cuticle usually differentiated laterally. Cephalic sense organs in three distinctly separated crowns. Buccal cavity usually strongly cuticularized; anterior portion shallow, sometimes with small pointed projections at border to the vestibulum; posterior portion dilated, cylindrical or conical, usually with strongly cuticularized walls and three thorn-like projections at the border between the two portions. Spicules sometimes differentiated proximally, medially or distally. Gubernacular apophyses usually directed caudally, occasionally dorsocaudally.Published as part of Fu, Sujing, Leduc, Daniel, Rao, Yiyong & Cai, Lizhe, 2019, Three new free-living marine nematode species of Dorylaimopsis (Nematoda Araeolaimida: Comesomatidae) from the South China Sea and the Chukchi Sea, pp. 433-450 in Zootaxa 4608 (3) on page 434, DOI: 10.11646/zootaxa.4608.3.2, http://zenodo.org/record/306669
Dorylaimopsis Ditlevsen 1918
No full textGenus Dorylaimopsis Ditlevsen, 1918 Type species: Dorylaimopsis punctata Ditlevsen, 1918 Diagnosis (modified from Jensen (1979) & Leduc (2012)). Dorylaimopsinae. Cuticle with transverse rows of punctations, lateral differentiation as a ridge with longitudinal rows of coarse dots. Posterior portion of buccal cavity cylindrical, with three thorn-like teeth at border to anterior portion. Outer labial sensilla and cephalic setae in separate circles. Spicules slender, usually long, arcuate or jointed. Gubernacular apophyses directed caudally or dorsocaudally.Published as part of Fu, Sujing, Leduc, Daniel, Rao, Yiyong & Cai, Lizhe, 2019, Three new free-living marine nematode species of Dorylaimopsis (Nematoda Araeolaimida: Comesomatidae) from the South China Sea and the Chukchi Sea, pp. 433-450 in Zootaxa 4608 (3) on page 434, DOI: 10.11646/zootaxa.4608.3.2, http://zenodo.org/record/306669
Dorylaimopsis longispicula Fu & Leduc & Rao & Cai 2019, sp. n.
No full textDorylaimopsis longispicula sp. n. (Figures 1–3, Table 1) Material examined. Type specimens. Holotype male, inventory slide no. Beibuwan 201137. The habitat and locality. Beibu Gulf, the South China Sea. Collected on August 2011, 20 °39′N, 108°02′E, water depth 20 m, salinity 33.48‰; 20°38′N, 108°37′E, water depth 32 m, salinity 33.85‰; 20°39′N, 109°32′E, water depth 23 m, salinity 33.48‰; surface sediment layer (0–10 cm), muddy sediment. Male inventory slide no. Beibuwan 201101, 201112, 201115, 201165 and 201169. Female inventory slide no. Beibuwan 201102, 201128, 201133 and 201165. Etymology. The name refers to the long spicules that characterize the new species. Description. Male. Body long, slender, tapering toward both extremities. Cuticle with punctations from level of amphid to 2/3 of conical portion of tail. Lateral differentiation consisting of four longitudinal rows of larger dots in pharyngeal and tail regions, two rows of larger dots elsewhere. Somatic setae rare and sparse, 5 μm long. Head set-off by constriction posterior to cephalic setae. Six inner labial papillae, six outer labial setae. Four cephalic setae, equal to 0.4–0.8 corresponding body diameters long, outer labial setae slightly shorter. Amphideal fovea spiral, 3 turns, located immediately posterior to cephalic setae. Anterior portion of buccal cavity cup-shaped, posterior portion of buccal cavity cylindrical, cuticularized, with three strong cuticularized teeth at border to anterior portion. Pharynx widening slightly posteriorly, not forming true bulb. Nerve ring near middle of pharynx. Renette situated posterior to cardia; excretory pore situated posterior to nerve ring. Reproductive system with two opposed and outstretched testes. Anterior testis to the left and posterior testis to the right of intestine. Spicules paired, equal to 3.2–3.8 cloacal body diameters in length, curved, proximal end strongly cephalated and tapering distally. Gubernaculum with two straight caudal apophyses. Twelve to sixteen tubular precloacal supplements present which are often difficult to distinguish. Tail slender, conico-cylindrical, posterior two thirds of tail conical with numerous short setae. Tail tip slightly enlarged, with three terminal setae. Three caudal glands and spinneret present. Female. Similar to males but shorter. Reproductive system didelphic, amphidelphic, with outstretched ovaries; anterior ovary to the left of intestine and posterior ovary to the right of intestine. Vulva equatorial. Spermatheca present, often with numerous spermatozoa. Tail shorter than in males, conico-cylindrical, with several short caudal setae and three short terminal setae. Three caudal glands and spinneret present. Diagnosis and relationships. Dorylaimopsis longispicula sp. n. is characterized by amphideal fovea with three turns, lateral differentiation consisting of four longitudinal rows of larger dots in pharyngeal and tail regions, two rows of larger dots in the middle regions; renette situated posterior to cardia; spicules 3.2–3.8 cloacal body diameters long and curved, twelve to sixteen tubular precloacal supplements present; tail tip with three terminal setae. Dorylaimopsis longispicula sp. n. is morphologically similar to D. intermedia Gagarin, 2013, D. brevispiculata Gagarin, 2013, D. rabalaisi Zhang, 1992, D. gerardi Muthumbi et al., 1997, D. variabilis Muthumbi et al., 1997 and D. papilla Guo et al., 2018 in the pattern of lateral differentiation, namely three or four longitudinal rows on the pharyngeal and tail regions, two rows in the middle body portion and with simple arcuate spicules structure. Dorylaimopsis longispicula sp. n. differs from D. intermedia in the longer spicules (179–197 μm vs 149–164 μm in D. intermedia) and presence of precloacal supplements in males of new species. Dorylaimopsis longispicula sp. n. differs from D. rabalaisi in the numbers of amphidial fovea turns (3 vs 2.5–2.75 in D. rabalaisi), longer spicules (179–197 μm vs 60–97 μm in D. rabalaisi), and spicules cuticularisation without ventral discontinuity (“ventral opening”) near proximal end. In addition, D. longispicula sp. n. has much longer spicules than D. brevispiculata (179–197 μm vs 59–68 μm in D. brevispiculata), D. gerardi (3.2–3.8 vs 1.7–1.9 cloacal body diameter in D. gerardi) and D. variabilis (3.2–3.8 vs 1.8–2.4 cloacal body diameter in D. variabilis), and it can be distinguished from D. brevispiculata based on absence of precloacal supplements in D. brevispiculata, and differs from D. variabilis and D. papilla by spicules with capitulum in D. variabilis and D. papilla.Published as part of Fu, Sujing, Leduc, Daniel, Rao, Yiyong & Cai, Lizhe, 2019, Three new free-living marine nematode species of Dorylaimopsis (Nematoda Araeolaimida: Comesomatidae) from the South China Sea and the Chukchi Sea, pp. 433-450 in Zootaxa 4608 (3) on pages 434-438, DOI: 10.11646/zootaxa.4608.3.2, http://zenodo.org/record/306669
New nematode species from the continental slope of New Zealand (Chromadorea, Microlaimida, and Chromadorida), and unexpected placement of the genus Molgolaimus Ditlevsen, 1921
No full textAbstract(#br)The current nematode classification comprises three primarily marine basal Chromadorean orders: the Microlaimida Leduc et al., 2018; Desmodorida De Coninck, 1965; and Chromadorida Chitwood, 1933. The phylogenetic placement of several taxa within these orders, however, is unclear due to the paucity of taxonomically informative morphological characters for high-level classification and is yet to be tested by molecular phylogenetic analyses due to the absence of molecular sequences. Here, we describe Molgolaimus kaikouraensis sp. nov. and Aponema pseudotorosum sp. nov. from the continental slope of New Zealand and investigate phylogenetic relationships of these species and that of the rare desmodorid genera Onepunema and Pseudonchus , using SSU phylogenetic analyses for the..
Two new ovoviviparous species of the family Selachinematidae and Sphaerolaimidae (Nematoda, Chromadorida &amp; Monhysterida) from the <br />northern South China Sea
No full textTwo new ovoviviparous nematode species are described from South China Sea. Bendiella vivipara n. sp. belongs to the family Selachinematidae and is characterized by a cuticle with lateral differentiation of 2–4 longitudinal rows of dots, and the presence of 3 papillose precloacal supplements. Parasphaerolaimus jintiani n. sp. is characterized by a cuticle with lateral longitudinal unstriated band extending from about the middle of the pharynx to the anterior two-thirds of the tail and a vulva situated far posteriorly. The importance of ovoviviparity in free living marine nematodes is discussed. </jats:p
Phytoremediation of Cadmium-Contaminated Soil by Two Jerusalem Artichoke (Helianthus tuberosus L.) Genotypes.pdf
No full textA concise, fast and efficient one-pot methodology has been developed for preparing 2,3-unsubstituted indoles from 2-nitrotoluenes and dimethylformamide dimethyl acetal. Compared with the classical Leimgruber-Batcho reaction, such a one-pot process simplified the operation procedures, generated less by-products and chemical residues, and resulted in higher overall yields in a shorter reaction time.A concise, fast and efficient one-pot methodology has been developed for preparing 2,3-unsubstituted indoles from 2-nitrotoluenes and dimethylformamide dimethyl acetal. Compared with the classical Leimgruber-Batcho reaction, such a one-pot process simplified the operation procedures, generated less by-products and chemical residues, and resulted in higher overall yields in a shorter reaction time
Parallel Spatiotemporal Network to recognize micro-expression
No full textMicro-expressions are fleeting spontaneous facial expressions that commonly occur in high-stakes scenarios and reflect humans’ mental states. Thus, it is one of the crucial clues for lie detection. Furthermore, due to the brief duration of micro-expression, temporal information is important for micro-expression recognition. The paper proposes a Parallel Spatiotemporal Network (PSN) to recognize micro-expression. The proposed PSN includes a spatial sub-network and a temporal sub-network. The spatial sub-network is a shallow network with subtle motion information as the input. And the temporal sub-network is a network with a novel temporal feature extraction unit that extracts sparse temporal features of micro-expressions. Finally, we propose an element-wise addition with 1 × 1 convolutional kernel fusion model to fuse the spatial and temporal features. The proposed PSN gets better measurement metrics (such as recognition rate, F1 score, true positive rate, and true negative rate) than the other state-of-the-art methods on the consisted databases consisting of CASME, CASME II, CAS(ME)2, and SAMM.</p
Two New Species of Free-Living Marine Nematodes of the Desmodoridae from Mangrove Wetlands of Xiamen Bay, China
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