Memoirs: Contributions to the Anatomy of Earthworms, with Descriptions of some New Species

1890 ◽  
Vol s2-30 (120) ◽  
pp. 421-479
Author(s):  
FRANK E. BEDDARD
Keyword(s):  
New Species ◽  
Blood Vessel ◽  
Peripheral Nerve ◽  
Follicular Epithelium ◽  
Nerve Plexus ◽  
Single Pair ◽  
Single Aperture ◽  
Anterior Segments ◽  
Germinal Cells ◽  
Viscous Substance

The more important new facts contained in the present paper are the following: (1) Description of Acanthodrilus antarcticus, A. Rosæ, A. Dalei, nn. spp. (2) The ciliation of the spermathecal appendix iu A. Rosæ. (3) The presence in Eudrilus of two pairs of ovaries, connected by oviducts with a single aperture on each side; the oviducts are continuous with the ovaries. (4) The description of Perichæta intermedia, n. sp., which differs from most species of Perichseta in having a single pair of nephridia in each segment, and in having a tubular atrium like that of Acanthodrilus. (5) The presence of functional egg-sacs in the same species, in which the ova undergo their development surrounded by a follicular epithelium and with a mass of germinal cells attached to one pole, as in certain "Limicolæ," &c. (6) The presence of a peripheral nerve plexus in Perichæta, specially developed in the neighbourhood of the setæ. (7) The presence of a subintestinal blood-vessel in Acanthodrilus. (8) The presence of a subneural blood-vessel in Perichæta. (9) Description of the minute structure of the spermathecæ and the spermathecal appendices in Perichæta and Acanthodrilus; spermatozoa are only found in the appendices, the epithelium of which has largely undergone degeneration into a viscous substance, in which the spermatozoa are embedded. (10) Description of some epidermic glands in Perichæta, which are possibly equivalent to the capsulogenous glands of Lumbricus. (11) Description of certain organs in Perichæta and Acan-thodrilus which probably correspond to the "pericardial glands" of Lumbriculus. These consist of anetwork of capillaries with numerous spherical dilations crowded with cells; the whole network forms a compact series of organs clothed with chloragogen cells; they are found in the anterior segments only, and exhibit a more or less perfectly metameric arrangement. (12) Description of a series of paired sacs attached to the septa of Acanthodrilus georgianus, which appear to be special glycogenic organs.

scholarly journals A new species of Pista Malmgren, 1866 (Polychaeta, Terebellidae) from the north-western Mediterranean Sea

ZooKeys ◽  
2019 ◽  
Vol 838 ◽  
pp. 71-84
Author(s):  
Céline Labrune ◽  
Nicolas Lavesque ◽  
Paulo Bonifácio ◽  
Pat Hutchings
Keyword(s):  
New Species ◽  
Mediterranean Sea ◽  
Anterior Part ◽  
Posterior Part ◽  
Western Mediterranean ◽  
Single Pair ◽  
The North ◽  
Western Mediterranean Sea ◽  
North Western ◽  
A New Species

A new species of Terebellidae, Pistacolinisp. n., has been identified from the harbour of Banyuls-sur-Mer, north-western Mediterranean Sea. This new species was found in very high densities, exclusively in gravelly sand deposited manually, and was not found in the original source habitat of the gravel. This species is characterized by the colour of the ventral shields with pinkish anterior part and a blood red posterior part in live specimens, a pair of unequal-sized plumose branchiae inserted on segment II and anterior thoracic neuropodia with long-handled uncini. The presence of long-handled uncini even in the smallest specimens constitutes the major difference between Pistacolinisp. n. and other Pista species with a single pair of branchiae such as P.lornensis and P.bansei.

Blood vessel and peripheral nerve injury in burns

Burns ◽  
2011 ◽  
Vol 37 (6) ◽  
pp. 1079 ◽  
Author(s):  
Rui Chen ◽  
Yue-Jun Li ◽  
Dong-Bo Ou ◽  
Xue-Yong Li
Keyword(s):  
Blood Vessel ◽  
Peripheral Nerve ◽  
Nerve Injury ◽  
Peripheral Nerve Injury

Two new species of free-living marine nematodes of Adoncholaimus Filipjev, 1918 (Oncholaimida: Oncholaimidae: Adoncholaiminae) from Hokkaido, northern Japan, with a key to species and discussion of the genus

Nematology ◽  
2014 ◽  
Vol 16 (4) ◽  
pp. 437-451 ◽  
Author(s):  
Daisuke Shimada ◽  
Hiroshi Kajihara
Keyword(s):  
New Species ◽  
Buccal Cavity ◽  
Large Body ◽  
Single Pair ◽  
Marine Nematodes ◽  
Key To Species ◽  
Free Living ◽  
Two New Species ◽  
New Diagnosis ◽  
Northern Japan

Two new species of free-living marine nematodes,Adoncholaimus daikokuensissp. nov. andA. pseudofervidussp. nov., from the coastal area of northern Japan, are described and illustrated.Adoncholaimus daikokuensissp. nov. is similar to five congeners,A. derjugini,A. punctatus,A. oxyuroides,A. squaluscomb. nov. andA. filicaudacomb. nov. in the absence of a gubernaculum, but differs in the absence of a ventral swelling on tail, spicule length and buccal cavity length.Adoncholaimus pseudofervidussp. nov. is similar toA. fervidusin having large body size, short tail, similar positions of the excretory pore and nerve ring, short spicules, arrangement of subventral setae in posterior region of body in males, and a single pair of terminal pores of the Demanian system surrounded by small gland cells in females.Adoncholaimus pseudofervidussp. nov. differs fromA. fervidusin having smaller, more anteriorly located amphids, longer buccal cavity, absence of gubernaculum in the male, and a different position of the terminal pores in the female. Partial sequences of the mitochondrial cytochromecoxidase subunit I gene (309-337 bp) of the new species are provided for identification based on the DNA barcoding method.Metoncholaimoidesis proposed as a junior synonym ofAdoncholaimus. The new diagnosis ofAdoncholaimusand a key to species are provided.Adoncholaimus squaluscomb. nov.,Adoncholaimus filicaudacomb. nov., andAdmirandus papillatuscomb. nov. are proposed.

Two new terebellid polychaetes (Polychaeta: Terebellidae) from the state of São Paulo, southeastern Brazil

Zootaxa ◽  
2006 ◽  
Vol 1205 (1) ◽  
pp. 31 ◽  
Author(s):  
JOÃ MIGUEL DE MATOS NOGUEIRA ◽  
TARSILA MONTREZORO ALVES
Keyword(s):  
New Species ◽  
Intertidal Zone ◽  
Sao Paulo ◽  
The State ◽  
Lateral Margin ◽  
Southeastern Brazil ◽  
São Paulo ◽  
Ventral Lobe ◽  
Two New Species ◽  
Anterior Segments

Two new species of terebellid polychaetes are described, from material collected from the intertidal zone to 45 m deep off the State of São Paulo, southeastern Brazil. The thelepodine Pseudostreblosoma brevitentaculatum sp. nov., is characterised by short, distally expanded tentacles, the presence of a mid-ventral lobe on segment 1 and short lateral lobes on segments 2–4, and by the arrangement of branchial filaments. The species is compared to both other known species of the genus. The terebelline Phisidia rubra sp. nov. differs from its congeners by its smaller size, and by having up to four eyespots at each lateral margin of prostomium, close to the mouth, about 5 rows of secondary teeth above uncinial main fang, uncini arranged in double rows on segments 11–20, 14 pairs of notopodia and by anterior segments being dorsally inflated. Phisidia rubra sp. nov. is compared to its closest congeners and a table comparing all known species of Phisidia is provided.

A new species of terrestrial planarian of the genus Microplana (Platyhelminthes: Turbellaria; Tricladida: Continenticola) from Yorkshire, United Kingdom; with a discussion of Microplana humicola Vejdovsky 1890

Zootaxa ◽  
2021 ◽  
Vol 4980 (1) ◽  
pp. 174-184
Author(s):  
HUGH D. JONES ◽  
JILLIAN C. MCDONALD
Keyword(s):  
United Kingdom ◽  
New Species ◽  
Single Pair ◽  
A New Species

Two mostly white terrestrial planarians, about 7 mm long, found in a garden in Yorkshire, UK, are described. They have a single pair of eyes and both specimens are fully mature, with a single pair of ovaries, several testes, a conical penis papilla and a genito-intestinal duct, characters of the genus Microplana, but differ in color and size from other species of the genus and are described as Microplana edwardsi sp. nov. 

scholarly journals Hippocampus japapigu, a new species of pygmy seahorse from Japan, with a redescription of H. pontohi (Teleostei, Syngnathidae)

ZooKeys ◽  
2018 ◽  
Vol 779 ◽  
pp. 27-49 ◽  
Author(s):  
Graham Short ◽  
Richard Smith ◽  
Hiroyuki Motomura ◽  
David Harasti ◽  
Healy Hamilton
Keyword(s):  
New Species ◽  
Coi Gene ◽  
Single Pair ◽  
New Taxon ◽  
Mitochondrial Coi ◽  
Flat Surfaces ◽  
Mitochondrial Coi Gene ◽  
Large Spine ◽  
Lattice Pattern ◽  
Izu Islands

The pygmy seahorseHippocampusjapapigusp. n.is described based on three specimens, 13.9–16.3 mm SL, collected from a mixed soft coral and algae reef at 11 m depth at Hachijo-jima Island, Izu Islands, Japan. The new taxon shares morphological synapomorphies with the previously described central Indo-Pacific pygmy seahorses,H.colemani,H.pontohi, H.satomiae, andH.waleananus, including extremely small size, 12 trunk rings, strongly raised continuous cleithral ring, snout spine, large spine on the eighth lateral and fifth and 12 superior trunk ridges, respectively, and unusual wing-like-protrusions immediately posterior to the head.Hippocampusjapapigusp. n.can be distinguished from all congeners by the following combination of features in the anterodorsal area of the trunk: bilaterally paired wing-like protrusions formed by a single pair of large, truncate spines projecting dorsolaterad on the first superior trunk ridge, followed by a unique elevated dorsal ridge formed by triangular bony mounds dorsally on the second to fourth superior trunk ridges. In contrast,H.pontohipossesses a pair of large truncate spines projecting strongly laterad on both the first and second superior trunk ridges followed by flat surfaces dorsally on the third and fourth superior trunk rings. The new species can be further differentiated by genetic divergence fromH.pontohi(an uncorrected p-distance of 10.1% in the mitochondrial COI gene) and a striking reticulated white and brown lattice pattern on the head, trunk, and tail.Hippocampusjapapigusp. n.represents the fifth species of pygmy seahorse recorded in Japan.

scholarly journals Imaging Finding Analysis and Prognosis Comparison of Pancreatic Head Cancer Invading the Peripheral Nerve Plexus Among Different Groups

2021 ◽  
Author(s):  
Hongkun Ping ◽  
Nianhui Yu ◽  
Guang Tan ◽  
Lipeng Yang ◽  
Jiaqi Yu ◽  
...  
Keyword(s):  
Peripheral Nerve ◽  
Main Pancreatic Duct ◽  
Pancreatic Head ◽  
Nerve Plexus ◽  
Head Cancer ◽  
Pancreatic Head Cancer ◽  
Nerve Invasion ◽  
Duodenal Invasion ◽  
Group A ◽  
Group B

Abstract Background: To compare imaging features and analyze prognostic differences among different groups with pancreatic head cancer invading the peripheral nerve plexus. Methods: We reviewed preoperative multislice spiral CT (MSCT) images, complete surgical records, and postoperative pathological results of 93 patients with pancreatic head cancer and peripheral nerve invasion. Two radiologists who were unaware of surgical and pathological results evaluated the MSCT images to determine peripheral nerve invasion of pancreatic head cancer. A pathologist who was unaware of the imaging findings grouped the patients based on surgical records and pathological findings. Pancreatic head cancer invasion of the anterior neural pathway was assigned to group A and invasion of pancreatic plexus 1, pancreatic plexus 2, and root of the mesenteric pathway to group B. Both groups were evaluated for peripheral nerve invasion, tumor size, dilatation of the common bile duct/main pancreatic duct, duodenal invasion, and prognosis of pancreatic head cancer.Results: A mass- and strand-like pattern or coarse reticular pattern was frequently observed when two groups of pancreatic head cancer invaded the peripheral nerve plexus. Intergroup differences in tumor size and common bile duct/main pancreatic duct dilatation were insignificant. The duodenal invasion rate was higher in group A than in group B; however, the intergroup difference was insignificant. The prognosis was poorer for group A than for group B.Conclusions: Although the intergroup differences in radiographic findings were not significant, the prognosis was poorer for group A than for group B.

scholarly journals Trichomycterus anhanga, a new species of miniature catfish related to T. hasemani and T. johnsoni (Siluriformes: Trichomycteridae) from the Amazon basin, Brazil

2012 ◽  
Vol 10 (2) ◽  
pp. 225-231 ◽  
Author(s):  
Guilherme M. Dutra ◽  
Wolmar B. Wosiacki ◽  
Mario C. C. de Pinna
Keyword(s):  
New Species ◽  
Amazon Basin ◽  
Sensory System ◽  
Ventral Surface ◽  
Dark Spot ◽  
Single Pair ◽  
Mandibular Symphysis ◽  
Dorsal Fin ◽  
Northern Brazil ◽  
A New Species

Trichomycterus anhanga is described from the Amazon basin, northern Brazil. The species is diagnosed by the latero-sensory system which is restricted to LL1 and LL2, the pectoral fin with two branched rays, the absence of pelvic fins and girdle, the reduced jaws and pharyngeal dentition, the presence of six to seven interopercular odontodes, the absence of a lateral series of spots, the presence of a small dark spot on the ventral surface of the mandibular symphysis, the narrow comma-shaped palatine, the absence of procurrent rays anterior to the dorsal and anal fins, the position of insertion of the first dorsal-fin pterygiophore and the presence of a single pair of pleural ribs. Trichomycterus anhanga shares with T. hasemani and T. johnsoni a wide cranial fontanel which occupies most of the skull roof. Miniaturization as well as synapomorphies for the T. hasemani group are discussed.

Sign in / Sign up

Export Citation Format

Share Document