A new species of platyctenean ctenophore, Lyrocteis flavopallidus sp. nov., from McMurdo Sound, Antarctica

1972 ◽  
Vol 50 (1) ◽  
pp. 47-52 ◽  
Author(s):  
Gordon A. Robilliard ◽  
Paul K. Dayton
Keyword(s):  
New Species ◽  
Larval Development ◽  
Reproductive System ◽  
New Genus ◽  
Geographical Location ◽  
The Body ◽  
Food Items ◽  
Yellow Color ◽  
The Antarctic ◽  
A New Species

Lyrocteis flavopallidus sp. nov., a large (up to 110 mm tall) platyctenean ctenophore from the Antarctic, is described on the basis of the external morphology. The pale straw-yellow color, lack of ridges and frills on the body and arms, presence of small papillae on the body, and geographical location are considered sufficient to distinguish L. flavopallidus from L. imperatoris Komai, 1941, the only other species in the genus. The systematic placement of L. flavopallidus is somewhat uncertain because neither the anatomy of the reproductive system nor the larval development is known; the species may represent a new genus and possibly a new family.Lyrocteis flavopallidus is sedentary and usually found atop sponges or other elevated surfaces. However, it is able to move at least 1 to 2 m per day possibly to attain a more advantageous feeding position. Food items are captured by the sticky tentacles and transferred to the mouth.

VI.—Note on Ephippioceras clitellarium, J. de C. Sowerby, sp., and E. costatum, A. H. Foord

1900 ◽  
Vol 7 (12) ◽  
pp. 560-561
Author(s):  
G. C. Crick
Keyword(s):  
New Species ◽  
New Genus ◽  
British Museum ◽  
Acute Angle ◽  
The Body ◽  
Museum Collection ◽  
Body Chamber ◽  
Coal Measures ◽  
A New Species

The name Nautilus clitellarius was given by J. de C. Sowerby to a Nautiloid from the Coal-measures, Coalbrookdale, Shropshire, and the description was accompanied by three figures, each representing a different specimen. In 1884 the species was included by Professor Hyatt in his new genus Ephippioceras. In 1891 Dr. A. H. Foord found a new species, Ephippioceras costatum, which was said to be “distinguished from E. clitellarium (to which it is, however, very closely related) by the character of the septa and by the surface ornaments. The septa in E. costatum do not form such an acute lobe upon the periphery as do those of E. clitellarium, and they are also a little wider apart in the former species than they are in the latter. Moreover, E. costatum is provided with prominent transverse costæ, which are strongest upon the sides of the shell where they swell out into heavy folds. These costæ are directed obliquely backwards, and cross the septa at an acute angle, passing across the periphery and forming a shallow sinus in the middle. None of the specimens in the British Museum have the test preserved, so that the ribbing has only been observed upon casts. The costæ are equally well developed upon the body-chamber and upon the septate part of the shell in the adult, but they were either very feeble or altogether absent in the young.” A re-examination of the specimens in the Museum collection shows that the separation of the two forms is quite justifiable.

scholarly journals Meplitumen aluna gen. nov., sp. nov. an interesting eutardigrade (Hypsibiidae, Itaquasconinae) from the Sierra Nevada de Santa Marta, Colombia

ZooKeys ◽  
2019 ◽  
Vol 865 ◽  
pp. 1-20
Author(s):  
Oscar Lisi ◽  
Anisbeth Daza ◽  
Rosana Londoño ◽  
Sigmer Quiroga ◽  
Giovanni Pilato
Keyword(s):  
New Species ◽  
Sierra Nevada ◽  
New Genus ◽  
The Body ◽  
Unique Combination ◽  
Insertion Point ◽  
Pharyngeal Bulb ◽  
Caudal Extremity ◽  
A New Species

A new genus of Itaquasconinae, Meplitumengen. nov., and a new species, Meplitumenalunasp. nov., are described. The new genus has characters present in other genera of Itaquasconinae but in a unique combination. The spiral thickening of the bucco-pharyngeal tube is also present anteriorly to the insertion point of the stylet supports, excluding only the short portion where the apophyses for the insertion of the stylet muscles (AISM) are present. This character is similar to Astatumen Pilato, 1997 but Meplitumengen. nov. differs from this genus as stylet furcae are shaped differently and as stylet supports and placoids are present. The presence of a spiral thickening in a portion of the buccal tube anterior to the stylet supports distinguishes the new genus from Mesocrista Pilato, 1987, Platicrista Pilato, 1987 and Itaquascon de Barros, 1939. Meplitumengen. nov. also differs from Mesocrista, in having the caudal processes of the AISM pointing laterally (instead of postero-laterally), and the apices of the caudal processes of the stylet furcae unswollen. From Itaquascon the new genus also differs by having more robust stylet supports, pharyngeal bulb with placoids, stylet furcae differently shaped. Meplitumengen. nov. also differs from Platicrista in having caudal processes of the AISM more robust and not flexible, and more slender stylet supports. The new species, Meplitumenalunasp. nov., has a cuticle with a very faint roughness at the caudal extremity of the body, and eyes probably absent. The pharyngeal bulb is long, with two long, narrow, rod-shaped macroplacoids; a microplacoid and septulum are absent. The claws are well developed with main branches provided with accessory points, and at the base of the claws, a structure interpretable as a very thin lunule is present. Other cuticular thickenings on the legs are absent.

The new genus Acrocephalomyia, and a new species of Ropalomera from Costa Rica, with additional records for other Mesoamerican species (Diptera: Ropalomeridae)

Zootaxa ◽  
2012 ◽  
Vol 3478 (1) ◽  
pp. 553-569 ◽  
Author(s):  
SERGIO IBÁÑEZ-BERNAL ◽  
VICENTE HERNÁNDEZ-ORTIZ
Keyword(s):  
New Species ◽  
Costa Rica ◽  
Central America ◽  
New Taxa ◽  
New Genus ◽  
The Body ◽  
New Genus And Species ◽  
The Family ◽  
Forward Projection ◽  
A New Species

New taxa of the family Ropalomeridae from Costa Rica are described, and additional records of ropalomerid flies fromMexico and Central America are provided. The new genus and species Acrocephalomyia zumbadoi can be easily distin-guished from all other ropalomerid genera by the following combination of characters: angular forward projection of head,absence of ocelli, flat face, bare arista, long scutum, and scutellum triangular-shaped and dorsally flattened with only onepair of apical bristles with bases approximated. The new species Ropalomera aterrima can be recognized from congenersby remarkable differences of the head, the shape of the scutellum, the absence of scutal vittae, fumose wings, and by theblack coloration of the body, ocellar bristles large, one postpronotal bristle, scutum without pollinose vittae and flat scutellum. Lenkokroeberia chryserea Prado and Kroeberia fuliginosa Lindner are newly confirmed for Costa Rica.

Giving up on elaborate dermal ossicles: a new genus of ossicleless Apodida (Holothuroidea)

2017 ◽  
Vol 98 (7) ◽  
pp. 1685-1688 ◽  
Author(s):  
Camilla Souto ◽  
Luciana Martins ◽  
Carla Menegola
Keyword(s):  
New Species ◽  
Shallow Water ◽  
New Genus ◽  
The Body ◽  
The Other ◽  
Brazilian Coast ◽  
South Eastern ◽  
Phylogenetic Framework ◽  
A New Species ◽  
Calcareous Ring

In this paper we describe a new genus and a new species of Chiridotidae based on specimens collected in shallow water off the South-eastern Brazilian coast. Gymnopipina ikamiaba gen. nov. et sp. nov. is characterized by the complete absence of dermal ossicles in the body, and it differs from the other ossicleless apodids in the number of tentacles and of Polian vesicles, and in the morphology of the calcareous ring. Although not formally tested with a phylogenetic framework, apodids have apparently lost their dermal ossicles multiple times. If these reversions hold true, Gymnopipina gen. nov. represents the fourth independent loss of dermal ossicles in the class Holothuroidea. An identification key to the Brazilian apodid species is also provided.

Thandarum hernandezi, a new genus and new species of sea cucumber family Sclerodactylidae (Echinodermata: Holothuroidea: Dendrochirotida) from the Southwestern Atlantic Ocean

Zootaxa ◽  
2012 ◽  
Vol 3304 (1) ◽  
pp. 63 ◽  
Author(s):  
MARIANO I. MARTINEZ ◽  
MARTÍN I. BROGGER
Keyword(s):  
New Species ◽  
Sea Cucumber ◽  
Body Wall ◽  
New Genus ◽  
The Body ◽  
Southwestern Atlantic ◽  
Double Row ◽  
Southwestern Atlantic Ocean ◽  
A New Species ◽  
Tube Feet

A new genus and a new species of dendrochirotid, Thandarum hernandezi gen. et sp. nov., is described from Buenos Airescoast in the Southwestern Atlantic. For this species is quite significant the body U shape, up to 14.08 mm (along thetrivium), with double row of podia restricted to the ambulacra. Other features are ossicles from body wall with buttonsand 4 pillar tables, tube feet with rods and end plate star-shaped; the introvert with rosettes and tentacles with rods. Thesecharacteristics require the recognition of a new genus, and the new species and represents the first sclerodactylid reported in Argentinean waters.

The life-cycle of Rasajeyna nannyla n.gen., n.sp., a coccidian pathogen of Tipula paludosa Meigen

Parasitology ◽  
1977 ◽  
Vol 74 (3) ◽  
pp. 273-283 ◽  
Author(s):  
J. E. Beesley
Keyword(s):  
New Species ◽  
New Genus ◽  
Nuclear Division ◽  
Refractile Body ◽  
The Body ◽  
Confidence Limits ◽  
Active Flexion ◽  
The Family ◽  
External Phase ◽  
A New Species

A coccidium belonging to the family Adeleidae was discovered in the mid-gut cells of Tipula paludosa. A new genus Rasajeyna and a new species nannyla are established because this pathogen differs from previously described coccidia. A diagnosis of R. nannyla is given.The endogenous phase of R. nannyla is restricted to larvae. The oocysts, which are the external phase of the parasite, are swallowed by the leatherjackets and excyst in the anterior mid-gut. The sporozoites, 36·5 µm (± 5·4 µm, 95% confidence limits) long, 15·7 µm (± 1·8 µm, 95% confidence limits) wide, each containing a refractile body, enter the anterior mid-gut cells where the 1st schizogony occurs. The refractile bodies are retained during the early nuclear divisions. The sausage-shaped merozoites, 28·2 µm (± 4·3 µm, 95% confidence limits) long, 7·1 µm (± 0·9 µm, 95% confidence limits) wide, with posterior nuclei exhibit three distinct types of movement. (a) An active flexion of the body which is thought to occur during the intracellular phase. (b) A flicking action by both ends of the body. This is thought to occur during the free phase. (c) A spiralling motion which is thought to aid the entry of the merozoite into the cells.The nucles of the intracellular merozoite divides several times, forming a multinucleate body. The merozoites of the 2nd schizogony form in groups at the poles of the schizont. The merozites are indistinguishable from each other until after a period of growth has ensued, when they are differentiated as macro- and microgametocytes. The pear-shaped macrogamete 44·3 µm (± 4·5 µm, 95% confidence limits) long, 21·6 µm (± 3·2 µm, 95% confidence limits) wide, which contains a crescent-shaped structure in the nucleus. The microgametocyte grows to 40·3 µm (± 2·7 µm, 95% confidence limits) long, 16·7 µm (± 1·5 µm, 95% confidence limits) wide and then attaches itself lengthwise to the macrogamete. A membrane is then secreted around both partners. Nuclear division produces 4 microgametes, one of which fertilizes the female. The 1st and 2nd oocyst membranes are deposited before cytoplasmic shrinkage and meiosis. The zygote is 44·6 µm (± 4·2 µm, 95% confidence limits) long and 33·7 µm (± 4·1 µm, 95% confidence limits ) wide. Cytoplasmic condensation around the nuclei forms the sporoblasts which mature into sporocysts each containing 1 sporozoite. The zygote may be expelled from the larvae at any juncture after fertilization.

Two new species of umagillid flatworms from the 20-rayed antarctic crinoid Promachocrinus kerguelensis

1987 ◽  
Vol 65 (4) ◽  
pp. 1001-1009
Author(s):  
George L. Shinn
Keyword(s):  
New Species ◽  
Digestive Tract ◽  
Antarctic Peninsula ◽  
Reproductive System ◽  
The Body ◽  
Western Coast ◽  
Two New Species ◽  
Small Intestinal ◽  
The Antarctic

Two new endosymbiotic turbellarians from the 20-rayed crinoid Promachocrinus kerguelensis are described from specimens collected off the western coast of the Antarctic Peninsula. Desmote antarcticus sp.n. differs from previously described members of the genus in the shape of the penis stylet, orientation of the terminal branches of the ovaries, and connections of the genital ducts to the exterior. Parafallacohospes bransfieldensis gen. et sp.n. is distinctive among known umagillids in having a pair of broad lobes projecting from each side of the body. The anatomy of the reproductive system is similar to that of Fallacohospes inchoatus Kozloff except that P. bransfieldensis lacks a secondary uterus. In addition, P. bransfieldensis has a functional digestive tract with small intestinal ceca, whereas F. inchoatus, the only species in the genus Fallacohospes, lacks a digestive tract. In this respect, Parafallacohospes appears to be intermediate between Desmote, which has large intestinal ceca, and Fallacohospes. Both new species belong to the subfamily Bicladinae, which includes all other crinoid-inhabiting umagillid flatworms.

scholarly journals A dodecapodous pycnogonid

1933 ◽  
Vol 113 (781) ◽  
pp. 107-115 ◽  
Keyword(s):  
New Species ◽  
New Genus ◽  
The Novel ◽  
Remarkable Feature ◽  
Preliminary Diagnosis ◽  
The Antarctic ◽  
A New Species

Among of Pycnogonida obtained by Sir Douglas Mawson, F. R. S., on his latest voyage to the Antarctic is a specimen presenting the novel and remarkable feature of having six pairs of legs. It is of relatively gigantic size, spanning 20 inches from tip to tip of its outstretched legs, and represents a new species which we propose to refer to a new genus. The purpose of this paper is to give a preliminary diagnosis of the genus, a brief description of the specimen for systematic purposes, and a discussion of its bearing on the morphology and phylogeny of the Pycnogonida. Dodecolopoda , gen. nov. Differing from Decolopoda only in possessing six instead of five trunk-somites, each bearing a pair of legs.

scholarly journals Adelieledone, a new genus of octopodid from the Southern Ocean

2003 ◽  
Vol 15 (4) ◽  
pp. 415-424 ◽  
Author(s):  
A.L. ALLCOCK ◽  
F.G. HOCHBERG ◽  
P.G.K. RODHOUSE ◽  
J.P. THORPE
Keyword(s):  
New Species ◽  
Southern Ocean ◽  
Salivary Glands ◽  
Antarctic Peninsula ◽  
New Genus ◽  
Size At Maturity ◽  
Lower Beak ◽  
The Antarctic ◽  
A New Species

The syntypes of the endemic Southern Ocean octopodid Pareledone polymorpha (Robson, 1930) were re-examined and measurements, counts and indices are presented. The two forms described by Robson, namely oblonga and affinis, are determined to have no taxonomic validity. The species polymorpha shows morphological similarities with Pareledone adelieana (Berry, 1917) but differs in relative arm lengths, sucker counts, external colouration and size at maturity. Both species are transferred to the new genus Adelieledone, which is separated from the genus Pareledone s.s. by the transverse ridges in the ligula groove of the hectocotylus, the sharp tip of the lower beak, the enlarged posterior salivary glands, the absence of stylets and by skin sculpture, especially by the presence of two longitudinal integumentary ridges on the dorsal mantle. A new species, Adelieledone piatkowski, is described from the Antarctic Peninsula. Beak morphology can discriminate the genera in predator studies.

Neoriojatrema mokokchungensis n. g., n. sp. (Monogenea: Polystomatidae: Polystomatinae) from the urinary bladder of a megophryid frog, Xenophrys glandulosa, in Nagaland, north-eastern India

2010 ◽  
Vol 84 (4) ◽  
pp. 375-380 ◽  
Author(s):  
R. Imkongwapang ◽  
V. Tandon
Keyword(s):  
New Species ◽  
Urinary Bladder ◽  
New Genus ◽  
Present Form ◽  
The Body ◽  
Type Locality ◽  
Eastern India ◽  
North Eastern ◽  
North Eastern India ◽  
A New Species

AbstractA new monogenean fluke, collected from the urinary bladder of a megophryid frog, Xenophrys glandulosa Fei, Ye & Huang, 1991 from Mokokchung and Tuensang districts of Nagaland, north-eastern India is described. Of the six genera under the subfamily Polystomatinae (Polystomatidae) known so far, the present form comes closer to Eupolystoma Kaw, 1950; Pseudopolystoma Yamaguti, 1963 and Riojatrema Lamothe-Argumedo, 1964, in all of which the opisthaptor lacks large hooks. However, a combination of characters, namely, shape of the body, rounded or bulbous pharynx, intestinal caeca not joining posteriorly in the opisthaptoral region, ovary located in the anterior third of the body and presence of vaginal apertures, sets the present form apart from all these genera, and also from the known species of Riojatrema. These differences warrant the establishment of a new species and a new genus to accommodate the present form. The validity of this new monogenean, named as Neoriojatrema mokokchungensis after the type locality of the fluke, is discussed.

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