scholarly journals A new nektaspid euarthropod from the Lower Ordovician strata of Morocco

2020 ◽  
pp. 1-9 ◽  
Author(s):  
Francesc Pérez-Peris ◽  
Lukáš Laibl ◽  
Lorenzo Lustri ◽  
Pierre Gueriau ◽  
Jonathan B Antcliffe ◽  
...  
Keyword(s):  
New Species ◽  
Posterior Margin ◽  
Anterior Margin ◽  
Rare Occurrence ◽  
Marine Communities ◽  
Lower Ordovician ◽  
Low Diversity ◽  
A New Species ◽  
Digestive Glands

Abstract Nektaspids are Palaeozoic non-biomineralized euarthropods that were at the peak of their diversity during the Cambrian Period. Post-Cambrian nektaspids are a low-diversity group with only a few species described so far. Here we describe Tariccoia tazagurtensis, a new species of small-bodied nektaspid from the Lower Ordovician Fezouata Shale of Morocco. The new species differs from the type (and only other known) species from the Ordovician strata of Sardinia (Italy), Tariccoia arrusensis, in possessing more pointed genal angles, a cephalon with marginal rim, a pygidium with anterior margin curved forwards, a rounded posterior margin, and longer and more curved thoracic tergites. The two specimens of T. tazagurtensis sp. nov. show remains of digestive glands that are comparable to those seen in the Cambrian nektaspid Naraoia. The rare occurrence of T. tazagurtensis sp. nov. in the Fezouata Shale and the distribution of other liwiids suggest that these liwiids were originally minor members of open-marine communities during the Cambrian Period, and migrated into colder brackish or restricted seas during the Ordovician Period.

Acrochordonichthys gyrinus, a new species of akysid catfish (Teleostei: Siluriformes) from Thailand

Zootaxa ◽  
2003 ◽  
Vol 183 (1) ◽  
pp. 1 ◽  
Author(s):  
CHAVALIT VIDTHAYANON ◽  
HEOK HEE NG
Keyword(s):  
New Species ◽  
Posterior Margin ◽  
Anterior Margin ◽  
Species Group ◽  
Unique Combination ◽  
Maximum Width ◽  
Body Depth ◽  
Adipose Fin ◽  
Chao Phraya River ◽  
A New Species

Acrochordonichthys gyrinus, a new species of akysid catfish belonging to the A. ischnosoma species group, is described from the Chao Phraya River drainage in Thailand. It can be distinguished from congeners by a concave posterior margin of the pectoral fin and the unique combination of the following characteristics: head depth 9.8–11.4% SL; dorsal to adipose distance 7.4–8.6% SL; body depth at anus 8.3–10.5% SL; maximum width of humeral process 16.3% its length; and anterior margin of anal fin and posterior margin of adipose fin straight. This species represents the northernmost distribution of the genus.

Spelaeogammarus uai (Bogidielloidea: Artesiidae): a new troglobitic amphipod from Brazil 

Zootaxa ◽  
2017 ◽  
Vol 4231 (1) ◽  
pp. 38 ◽  
Author(s):  
RAFAELA BASTOS-PEREIRA ◽  
RODRIGO L. FERREIRA
Keyword(s):  
New Species ◽  
Posterior Margin ◽  
Anterior Margin ◽  
Statistical Approach ◽  
Southeastern Brazil ◽  
Apical Margin ◽  
Multivariate Statistical ◽  
Multivariate Statistical Approach ◽  
Length Width ◽  
A New Species

A new species was recently found in a cave from Southeastern Brazil, in the state of Minas Gerais, which is here described. Considering all the species of the genus, Spelaeogammarus uai sp. nov. is very similar to S. santanensis and S. sanctus, although the new species differs mainly in relation to the number of plumose setae in the apical margin of maxilliped inner plate, number of setae in the anterior margin of gnathopod 1 basis and number of setae in the posterior margin of gnathopod 2 basis. Furthermore, the ratio “length/width” of several articles of the new species is higher than in other species. An identification key of the Spelaeogammarus genus is provided, as well as a complemented multivariate statistical approach of the morphometry of the genus based on a previous work of the genus. 

A new Species of Lygus infesting Potatoes in Java (Rhynchota, Capsidae)

1923 ◽  
Vol 13 (4) ◽  
pp. 447-447
Author(s):  
W. E. China
Keyword(s):  
New Species ◽  
Posterior Margin ◽  
Anterior Margin ◽  
Pale Yellow ◽  
The Third ◽  
Orange Yellow ◽  
Brownish Black ◽  
Lateral Margins ◽  
Surrounding Areas ◽  
A New Species

Head 0·83 mm. long, shiny orange-yellow, with the clypeus and the adjoining portion of the frons shiny black. Eyes black, prominent, extending laterally beyond the anterior lateral margins of the pronotum. Rostrum brownish black, extending to, but not surpassing, the posterior coxae; lengths of the joints: first 0·53 mm., second 0·76 mm., third 0·4 mm., and fourth 0·6 mm. Antennae brownish black, the third and fourth joints somewhat paler; first joint slightly incrassated, length 0·83 mm., second 2·0 mm., third 1·83 mm., fourth 1 mm. Pronotum shiny orange-yellow, posteriorly somewhat suffered with dark brown; length in middle 1·4 mm., breadth at anterior margin 0·8 mm., at posterior margin 2·0 mm.; sides straight, posterior margin moderately convex. Scutellum shiny black, finely rugosely punctate and regularly covered with pale depressed hairs; length in the middle 1·3 mm. Corium and cuneus similar in colour and pilosity to the scutellum; membrane dark smoky brown, veins shiny black, passing the apex of the abdomen. Sternum: mesostethium and metastethium black, the metastethial orifices and the surrounding areas very pale yellow: undersides of abdomen shiny black, covered with very fine pale hairs. Legs: coaxae blackish brown; femora dirty orange-yellow, suffused at base and apex with brown; tibiae dark brown, armed with fine black spines; tarsi black, strongly pilose.

Hurleytrematoides justinei n. sp. (Digenea: Monorchiidae) from Valentinni’s sharpnose puffer, Canthigaster valentini (Bleeker) (Tetraodontiformes: Tetraodontidae) from Heron Island, Queensland, Australia

Zootaxa ◽  
2009 ◽  
Vol 2027 (1) ◽  
pp. 63-68 ◽  
Author(s):  
MARISSA K. A. McNAMARA ◽  
THOMAS H. CRIBB
Keyword(s):  
New Species ◽  
Ventral Sucker ◽  
Genital Pore ◽  
Posterior Margin ◽  
Anterior Margin ◽  
Ejaculatory Duct ◽  
The Third ◽  
The Family ◽  
Pore Opening ◽  
A New Species

A new species, Hurleytrematoides justinei n. sp., is described from Valentinni’s sharpnose puffer, Canthigaster valentini, from Heron Island, Queensland, Australia. It is characterized within the genus by a sinistral genital pore opening anterior to the posterior margin of the ventral sucker, a spiny ejaculatory duct ranging from 34 to 61 µm in length, and vitelline follicles extending from about the anterior margin of the testis to the posterior margin of the ventral sucker. Monorchiids are rare in the tetraodontids. This is the third species reported from the family and the first from the genus Canthigaster.

A new species of the Lower Ordovician pliomerid trilobite Pseudocybele and its biostratigraphic significance

Zootaxa ◽  
2010 ◽  
Vol 2550 (1) ◽  
pp. 21 ◽  
Author(s):  
NEO E. B. MCADAMS ◽  
JONATHAN M. ADRAIN
Keyword(s):  
New Species ◽  
Frontal Lobe ◽  
Diagnostic Features ◽  
Type Section ◽  
Lower Ordovician ◽  
Low Diversity ◽  
Lateral Branches ◽  
A New Species ◽  
Stratigraphic Interval

A low diversity trilobite fauna consisting entirely of new species occurs at several horizons in the Blackhillsian Stage (Floian), in a narrow stratigraphic interval high in the Fillmore Formation in the southern Confusion Range, Ibex area, Millard County, western Utah. This is the type section of the Blackhillsian Stage, the highest of the four stages with comprise the Ibexian Series, the Laurentian Lower Ordovician. The interval occurs between the underlying Presbynileus ibexensis Zone and the overlying "Pseudocybele nasuta Zone". Previous studies assigned the interval to the P. nasuta Zone, but new collections show that the fauna is unique and shares no species with either the underlying or overlying assemblages. It was recognized in 2009 as the Pseudocybele paranasuta Zone, but the name bearer was not formally described. Pseudocybele paranasuta n. sp. is a distinctive pliomerid trilobite with diagnostic features including: clusters of granules on the frontal lobe of the glabella and the middle body of the hypostome; maculae along the lateral branches of the middle furrow of the hypostome; a short, slender median hypostomal spine; and a strong, W-shaped impression in the terminal piece of the pygidium.

scholarly journals A new species of leaffish Polycentrus Müller & Troschel, 1849 (Percomorpha: Polycentridae) from the rio Negro, Brazil

2014 ◽  
Vol 12 (4) ◽  
pp. 747-753 ◽  
Author(s):  
Daniel Pires Coutinho ◽  
Wolmar Benjamin Wosiacki
Keyword(s):  
New Species ◽  
Posterior Margin ◽  
Lower Edge ◽  
Posterior Edge ◽  
Pectoral Fin ◽  
Dorsal Fin ◽  
Rio Negro ◽  
Ventral Edge ◽  
A New Species

A new species of Polycentrusis described from the rio Negro, in Brazil. It is distinguished from P. schomburgkii by the presence of two dark postocular and one subocular band, all smaller than orbital diameter, blunt snout, isognathous mouth, reduction of the serrations on the lower edge of the lacrimal-spines ranging from zero to two tiny spines at the posterior end, intensely serrated edge of the interopercle, fully serrated posterior edge of the vertical arm of the preopercle, presence of five pungent opercular spines, subopercle broadly serrated along most of its posterior ventral edge, presence of serrations dorsally on the posterior margin of the cleithrum, fourth ray of pectoral fin reaching the vertical through the anal-fin origin, 19-21 predorsal scales, 19-20 scales on dorsal-fin base, 12-14 scales on anal-fin base, and absence of a median opercular blotch.

scholarly journals Microglanis carlae, a new species of bumblebee catfish (Siluriformes: Pseudopimelodidae) from the río Paraguay basin in Paraguay

2008 ◽  
Vol 6 (3) ◽  
pp. 425-432 ◽  
Author(s):  
Héctor S. Vera Alcaraz ◽  
Weferson J. da Graça ◽  
Oscar A. Shibatta
Keyword(s):  
New Species ◽  
Species Complex ◽  
Anterior Margin ◽  
Color Pattern ◽  
Caudal Peduncle ◽  
Dorsal Fin ◽  
Fin Ray ◽  
Pectoral Spine ◽  
Adipose Fin ◽  
A New Species

Microglanis carlae, new species, is described from the río Paraguay basin and distinguished from its congeners by the following combination of characters: paired and anal fins mottled or with thin faint bands, trunk with dark-brown saddles, anterior margin of pectoral spine with serrations retrorse proximally and antrorse distally, tip of pectoral spine as a distinct bony point, continuous portion of lateral line reaching vertical through last dorsal-fin ray, caudal peduncle with irregularly shaped, faint to dark blotch, maxillary barbel surpassing vertical through dorsal-spine origin, and dark bar on posterior flank continuous from base of adipose fin to that of anal fin. The new species is included in the Microglanis parahybae species complex on the basis of color pattern.

scholarly journals A new species of Anchoviella Fowler, 1911 (Clupeiformes: Engraulidae) from the Amazon basin, Brazil

2012 ◽  
Vol 10 (1) ◽  
pp. 13-18 ◽  
Author(s):  
Marina V. Loeb
Keyword(s):  
New Species ◽  
Standard Length ◽  
Posterior Margin ◽  
Amazon Basin ◽  
Head Length ◽  
Estuarine Species ◽  
Dorsal Fin ◽  
Fin Ray ◽  
Upper Jaw ◽  
A New Species

Anchoviella juruasanga is described from the drainages of rios Negro, Madeira, Tapajós, Trombetas, Tocantins, and Jari, in the Amazon basin, Brazil. The new species is distinguished from its congeners by having a short upper jaw, with its posterior tip extending between the verticals through anterior and posterior margins of the pupil (vs. posterior tip of upper jaw extending beyond the vertical through posterior margin of the pupil). Anchoviella juruasanga is also distinct from other strictly freshwater Amazonian species of the genus by the distance from tip of snout to posterior end of upper jaw between 8 and 11% in standard length (vs. 14% or more in A. alleni, A. carrikeri, A. guianensis, and A. jamesi). The anal-fin origin slightly posterior to or at the vertical through the base of the last dorsal-fin ray further distinguishes the new species from A. alleni (anal-fin origin posterior to the vertical through the last anal-fin ray by at least 14% of head length) and A. jamesi (anal-fin origin anterior to the vertical through the last anal-fin ray). An identification key for the Amazonian species of Anchoviella, including marine and estuarine species known to occur in the lower portion of the basin, is presented.

A new species of Chimarra from China (Trichoptera, Philopotamidae) with description of its larva

Zootaxa ◽  
2018 ◽  
Vol 4504 (2) ◽  
pp. 253
Author(s):  
YAN-LI HU ◽  
BEI-XIN WANG ◽  
CHANG-HAI SUN
Keyword(s):  
New Species ◽  
Adult Male ◽  
Anterior Margin ◽  
Zhejiang Province ◽  
Gene Sequences ◽  
A New Species ◽  
Mtcoi Gene

The adult male and larva of a new species in the genus Chimarra Stephens, Chimarra paramonorum n. sp., are described, diagnosed, and illustrated based on the specimens collected in Zhejiang Province, China. The larva and adult male were associated by mtCOI gene sequences. The male can be separated from C. monorum and C. thienemanni mainly by small preanal appendages and by wrinkled, hairless endotheca. The larva of the new species can be separated from other congeners by a combination of characters including the notch on the anterior margin of the frontoclypeus, the teeth of the mandibles, and the length of the seta-bearing process of each forecoxa. The larval description is the first for Chimarra in China. 

scholarly journals A new species of Elasmopus (Amphipoda: Hadzioidea: Maeridae) from Suape Harbor, Northeastern Brazilian coast

2011 ◽  
Vol 83 (3) ◽  
pp. 1031-1040 ◽  
Author(s):  
André R. Senna
Keyword(s):  
New Species ◽  
Posterior Margin ◽  
Rocky Shore ◽  
Identification Key ◽  
Brazilian Coast ◽  
Amphipod Species ◽  
Intertidal Rocky Shore ◽  
Brazilian Species ◽  
The Family ◽  
A New Species

A new amphipod species of the genus Elasmopus Costa, 1853 is described based on material collected from intertidal rocky shore, near the Suape Harbor, coast of the Brazilian state of Pernambuco. The new species may be recognized by the propodus of gnathopod 2 suboval, slightly tapering distally, palmar margin not defined by a stout seta, spine, or palmar corner, with a subdistal blunt tubercle, posterior margin covered by a dense fringe of plumose setae, and posterior margin of basis of pereopod 7 castelloserrate. This is the ninety-fifth species of the genus Elasmopus described worldwide, the most diverse genus in the family Maeridae Krapp-Schickel, 2008, and the eighth species recorded from Brazilian waters. An identification key to Brazilian species of Elasmopusis also provided.

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