scholarly journals Sphaeridiotrema globulus (Rudolphi, 1814) (Digenea): evidence for two species known under a single name and a description of Sphaeridiotrema pseudoglobulus n.sp.

1993 ◽  
Vol 71 (4) ◽  
pp. 700-707 ◽  
Author(s):  
J. Daniel McLaughlin ◽  
Marilyn E. Scott ◽  
Jane E. Huffman
Keyword(s):  
New Jersey ◽  
Egg Size ◽  
Anterior Testis ◽  
The Body ◽  
Internal Organs ◽  
Posterior Testis ◽  
Mean Size ◽  
Basal Bulb ◽  
The Mean ◽  
A New Species

Experimental infection of domestic ducklings with metacercariae believed to be those of Sphaeridiotrema globulus from snails in Quebec, Canada, and New Jersey, U.S.A., revealed that there are two species known under this name. Study of museum specimens has confirmed that the New Jersey specimens represent the original S. globulus: the specimens from Quebec represent a new species. The two species can be separated reliably on the basis of egg size: S. globulus (New Jersey) has smaller eggs (mean 97 ± 4 (SD) μm; range 91–108 μm) than S. pseudoglobulus n.sp. from Quebec (mean 116 ± 5 μm: range 103–125 μm). The cirrus in S. pseudoglobulus has a basal bulb not found in that of S. globulus. There are fewer uterine coils anterior to the acetabulum in S. pseudoglobulus. Comparison of 6-day-old populations of each species revealed several statistically significant differences in the mean size of internal organs. The overall sizes of the body, ovary, and eggs and the width of the posterior testis were greater in S. pseudoglobulus: the pharynx, length of the posterior testis, and number of eggs in the uterus were greater in S. globulus. No differences were found in the size of the oral sucker, acetabulum, or anterior testis.

On a New Species of Trematode (Prohemistomum serpentum n.sp.) from a Snake, with a Note on an Immature Species of Heterechinostomum Odhner from the Cat

Parasitology ◽  
1932 ◽  
Vol 24 (3) ◽  
pp. 318-320 ◽  
Author(s):  
B. S. Gogate
Keyword(s):  
New Species ◽  
Anterior Margin ◽  
Anterior Testis ◽  
The Body ◽  
Entire Surface ◽  
Maximum Width ◽  
Maximum Thickness ◽  
Posterior Testis ◽  
Shallow Cavity ◽  
A New Species

Description. Body more or less elongated, narrowing anteriorly and posteriorly. Length 1·34–1·441, maximum width 0·476, maximum thickness 0·433, both measured in the region of adhesive apparatus. Entire surface of the body, except adhesive apparatus and the region posterior to second testis, covered with fine spines. Ventral folds originate approximately at centre of body and meet a little behind the level of posterior third to form a shallow cavity occupied by the adhesive apparatus. Adhesive apparatus smooth, oval, 0·4–0–44 long, 0·26–0–3 wide, with narrow central depression, anteriorly reaching acetabulum and posteriorly anterior margin of posterior testis. In it are imbedded vitelline follicles, anterior testis, ovary and anterior portions of cirrus sac and uterus.

Mesocoelium malayanum sp.n. (Digenea: Brachycoeliidae) in a frog, Rana macrodon Dumeril and Bibron 1941, from Malaysia

1977 ◽  
Vol 51 (3) ◽  
pp. 205-208 ◽  
Author(s):  
James R. Palmieri ◽  
John T. Sullivan
Keyword(s):  
New Species ◽  
Oral Sucker ◽  
Genital Pore ◽  
Anterior Testis ◽  
Intestinal Bifurcation ◽  
Excretory Vesicle ◽  
Posterior Testis ◽  
A New Species

ABSTRACTMesocoelium malayanum sp.n. is described from the frog Rana macrodon, in Malaysia. Elongate body, broader anteriorly, measuring 1·900 (1·679–2·070) mm long by 0·404 (0·380–0·437) wide, tegument aspinose oral sucker 0·212 (0·200–0·228) by 0·202 (0·191–0·205), acetabulum 0·141 (0·132–0·150) by 0·139 (0·123–0·146), prepharynx present, oesophagus 0·115 (0·096–0·137), caeca reaching posterior ⅓ of body, anterior testis 0·097 (0·087–0·110) by 0·091 (0·087–0·100) dorsal to acetabulum, posterior testis 0·094 (0·087–0·101) by 0·092 (0·091–0·100), cirrus pouch 0·121 (0·111–0·130) by 0·047 (0·041–0·055), genital pore at left of midline of oesophagus just anterior to intestinal bifurcation, ovary 0·110 (0·091–0·127) by 0·089 (0·085–0·096) on left of body and posterior to acetabulum, vitelline glands with single follicles extending from intestinal bifurcation to ends of caeca, excretory vesicle I-shaped and eggs 0·040 (0·037–0·046) by 0·023 (0·022–0·024). Although morphologically related to M. maroccanum and M. meggitti, M. malayanum is considered to be a new species.

A mechanism for swarming in the tunicate Salpa thompsoni (Foxton, 1961)

2001 ◽  
Vol 13 (3) ◽  
pp. 240-245 ◽  
Author(s):  
M.C. Daponte ◽  
F.L. Capitanio ◽  
G.B. Esnal
Keyword(s):  
Growth Rate ◽  
The Body ◽  
Optimal Conditions ◽  
Population Densities ◽  
Oocyte Maturity ◽  
Solitary Individual ◽  
Mean Size ◽  
The Mean ◽  
Two Populations ◽  
Parent Ratio

Two populations of Salpa thompsoni, collected from the Weddell–Scotia confluence area at the end of two summers (1994 and 1995) with contrasting densities, are compared. The present study was aimed at corroborating whether fluctuations in abundance could be related to some life history parameters considered as indicators of growth rate in salp populations, such as the body size of solitary reproductive individuals, number of buds per block or chain in the stolon, and the offspring to parent ratio. No differences were observed in the sizes reached by aggregate individuals, or in the size at which oocyte maturity was attained (moment at which the development of the embryo can be detected). There were no differences in the size reached by the embryos during their residence inside the mother's blastozooid. In 1995, the percentage of non-fecundated blastozooids (which included even the largest individuals) was higher than in 1994. The mean size of the solitary individuals was significantly higher in 1994 than in 1995. The number of buds per block was also significantly higher in most of the stages, confirming that this is the mechanism used by these organisms to produce swarms. This species eventually attains high population densities under favorable environmental conditions such as poor sea-ice cover in winter. Under optimal conditions, the number of potential descendants produced by a single solitary individual would exceed 800.

Influence of Egg Characteristics on Survival, Growth and Feeding in Larval Walleye (Stizostedion vitreum)

1989 ◽  
Vol 46 (3) ◽  
pp. 516-521 ◽  
Author(s):  
G. E. E. Moodie ◽  
N. L. Loadman ◽  
M. D. Wiegand ◽  
J. A. Mathias
Keyword(s):  
Fatty Acids ◽  
Mortality Rate ◽  
Growth Rates ◽  
Egg Size ◽  
The Other ◽  
Stizostedion Vitreum ◽  
Mean Size ◽  
Survival And Growth ◽  
The Mean ◽  
High Level

A subsample of eggs from 109 walleye (Stizostedion vitreum) from Crean Lake, Saskatchewan, was sieved soon after fertilization to yield four groups of eggs ranging in size from 4.86 to 5.62 mm3. Overall egg size tended to correspond to yolk and oil volumes. At hatching, larvae from the eggs with the least yolk and oil were significantly shorter than larvae from all other egg groups. At the end of the experiment, 13 d after hatching, the larvae from the eggs with the most yolk were significantly larger than larvae from the other egg groups. Differences in the mean amount of food ingested by larvae were related to initial egg size. The yolk of the smallest eggs was deficient in the (n-3) series of polyunsaturated fatty acids. Larvae from these small eggs had a high level of major body deformities and a mortality rate which reached 100% by day 10. Small egg size in itself did not appear disadvantageous; larvae from a different stock (Lake of the Prairies, Manitoba) which produced eggs with a mean size less than that of the smallest sieved eggs, had survival and growth rates comparable with those of the larger Crean Lake eggs.

Diplocystis tipulaesp.nov. (Sporozoa: Eugregarinorida), a parasite ofTipula paludosaMeigen (Diptera: Tipulidae)

Parasitology ◽  
1979 ◽  
Vol 78 (2) ◽  
pp. 207-220 ◽  
Author(s):  
P. L. Sherlock
Keyword(s):  
New Species ◽  
Life Cycle ◽  
Host Larva ◽  
Midgut Epithelium ◽  
Early Stages ◽  
Mean Size ◽  
The Mean ◽  
A New Species

SUMMARYStages seen in the life-cycle ofDiplocystis tipulaesp.nov. parasitic inTipula paludosaMg., included a structure that was probably a trophozoite within the midgut epithelium of one host larva and gamonts that developed on the midgut wall in the haemocoele of the larvae. Syzygy occurred, usually in pairs, when the gamonts were about 200–300 μm in diameter. Initially, syzygous gamonts were bilobed but they quickly became spherical and were enclosed by a fine membrane to form a gametocyst 450–550 μm in diameter. Early stages of gametogony were seen in one pupa; sporogony occurred in pupae and adults. The mean size of the round–oval oocysts was 7·14 × 6·26 μm. Individuals ofTipula oleraceaL. are also susceptible to infection withD. tipulae. This gregarine is considered to be a new species, independent of the gregarines of the gut lumen.

A new genus and species of the family Microlaimidae (Nematoda: Chromadorea) from intertidal sand of the Jeju Island, South Korea

Zootaxa ◽  
2021 ◽  
Vol 5020 (1) ◽  
pp. 130-140
Author(s):  
ALEXEY V. TCHESUNOV ◽  
RAEHYUK JEONG ◽  
WONCHOEL LEE
Keyword(s):  
South Korea ◽  
New Genus ◽  
Anterior Testis ◽  
The Body ◽  
Jeju Island ◽  
New Genus And Species ◽  
Pharyngeal Bulb ◽  
The Family ◽  
Secretory Gland ◽  
A New Species

As a part of the study of marine nematofauna of a sandy intertidal zone of Jeju Island (South Korea), a number of species have been proven as new for science. Here a new species representing a new genus of the family Microlaimidae (Chromadorea), Jejulaimus sinyangensis gen. n., sp. n. is described. The new monotypic genus is characterized by head set off abruptly from the body; anterior sensilla pattern 6+10, where six outer labial setiform sensilla together with four longer cephalic setiform sensilla are integrated in a common crown; pharyngostoma armed with a dorsal tooth and surrounded by convex muscular pharyngeal tissue, forming an anterior pharyngeal bulb which is distinctly set off from the rest of the pharynx; terminal pharyngeal bulb oval; ventral pore and ampulla of the excretory-secretory gland situated just posterior to the nerve ring; an only anterior testis present. The new genus bears some resemblance to the genera Bolbolaimus, Pseudomicrolaimus and Spirobolbolaimus in having an anterior pharyngeal bulb and in the position of the ventral pore of the excretory/secretory gland, but differs from them by anterior sensilla pattern 6+10, absence of subventral teeth in buccal cavity, and monorchic condition of male reproductive system.  

A new species of the commercially harvested jellyfish Crambionella (Scyphozoa) from central Java, Indonesia with remarks on the fisheries

2014 ◽  
Vol 95 (3) ◽  
pp. 471-481 ◽  
Author(s):  
Jun Nishikawa ◽  
Susumu Ohtsuka ◽  
Mulyadi ◽  
Nova Mujiono ◽  
Dhugal J. Lindsay ◽  
...  
Keyword(s):  
New Species ◽  
The Body ◽  
Commercial Fisheries ◽  
Body Colour ◽  
Central Java ◽  
Unknown Species ◽  
Specific Variation ◽  
The Mean ◽  
A New Species ◽  
I Gene

We describe a new species of Crambionella, C. helmbiru, from central Java, Indonesia. The combination of the mean number of lappets per octant (14), presence of foliaceous appendages amongst frills on oral-arms, absence of tubercles on the velar lappets, proportion of terminal club length to oral-arm length (0.28), and the body colour distinguish this species from three previously described congeners. In addition, the analysis of partial sequences of the cytochrome c oxidase subunit I gene indicate substantial genetic differences from both Crambionella orsini and Crambionella stuhlmanni, supporting the validity of this new species. A combination of morphological and genetic approaches determined that the remarkable differences in exumbrellar colours observed in specimens are simply intra-specific variation. Surprisingly, this species has been commercially harvested for more than 20 years and is well-known to the local people in the region, yet it had remained unknown to science until this point. The commercial fisheries targeting this formerly unknown species are also described in detail.

scholarly journals A new species of Blatticola Schwenk, 1926 (Oxyurida, Thelastomatidae) a parasite of Anurogryllus muticus (De Geer, 1773) (Orthoptera, Gryllidae) from Argentina

2007 ◽  
Vol 47 (15) ◽  
pp. 181-186 ◽  
Author(s):  
María Fernanda Achinelly ◽  
Nora B. Camino
Keyword(s):  
New Species ◽  
Body Length ◽  
Mouth Opening ◽  
Nerve Ring ◽  
The Body ◽  
The Other ◽  
Smooth Shell ◽  
Small Pore ◽  
Basal Bulb ◽  
A New Species

Blatticola cristovata n. sp. (Oxyurida, Thelastomatidae) a parasite of the cricket Anurogryllus muticus (De Geer, 1773) (Orthoptera, Gryllidae) from Argentina, is described and illustrated. This is the first species of the genus Blatticola found parasitizing cricket. This new species is characterized in females by having the cuticle annulated through the body length, the mouth opening is subtriangular and surrounded by eight cephalic papillae, the stoma is short with three pairs placed in two rows of cuticular sclerotised plates, amphids in small pore shaped, oesophagus is divided into three parts, anterior cylindrical corpus, isthmus distinct, and basal bulb valved, the nerve ring is situated around the middle of corpus, the intestine is wide broad anteriorly, oval eggs, smooth shell, with a straight side, and the other side with a band running longitudinally. Males with one pair of preanal, one pair of adanal and two pairs of postanal papillae, and the tail appendage short, conical and pointed.

scholarly journals A new species of Hammerschmidtiella Chitwood, 1932 (Nematoda, Thelastomatidae) parasite of the brown cockroach Periplaneta brunnea Burmeister, 1838 (Blattodea, Blattidae) from Argentina

2012 ◽  
Vol 57 (1) ◽  
Author(s):  
Nora Camino ◽  
Cristina Villalobos
Keyword(s):  
New Species ◽  
Buccal Capsule ◽  
Nerve Ring ◽  
The Body ◽  
Long Tail ◽  
Basal Bulb ◽  
A New Species

AbstractA new species of the genus Hammerschmidtiella, H. eltalaensis sp. nov. parasitizing a brown cockroach Periplaneta brunnea Burmeister from El Tala river, Catamarca, Argentina, is described and illustrated. It is characterized by having the cuticle striated, without lateral alae, mouth with three toothed lips and eight labial papillae, amphids small and pore shaped, buccal capsule short, wide, with four mobile teeth, oesophagus with metacorpus valvate, isthmus cylindrical and thin surrounded by nerve ring, and a rounded basal bulb heavily muscled and valvate, the vulva is slightly protruding and lies in the anterior third of the body, didelphic, prodelphic, eggs small and elongate, the male with one spicule, without gubernaculum, the genital papillae arranged in one pair of small preanal papillae, and two postanal papillae, one pair is the base of the tail appendage. Tail appendage very long, thin, and reaching almost one third of the length of the body in the female. In the male the posterior end of the body abruptly truncated posterior to anus with spine-like long tail appendage.

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