A new species of Bryconamericus (Characiformes, Stevardiinae, Characidae) from the Pacific coast of northwestern Ecuador, South America

A new species of Bryconamericus (Characiformes, Characidae, Stevardiinae) is described from the Pacific coast of northwestern Ecuador, South America. The new species is distinguished from all congeners by the presence in males of bony hooks on the caudal fin rays (vs. absence). The different layers of pigment that constitute the humeral spots have differing degrees of development and structure that are independent of each other. Brown melanophores are distributed in a thin, vertical, superficial layer of the epithelium (layer 1) and in another deeper (layer 2) that overlaps the first and is centered over the lateral–line. B. ecuadorensis has a horizontally oval or elliptical shape layer 2 pigment in the anterior humeral spot (vs. a rectangular or circular layer 2). The new species further differs in having an anterior extension of the caudal peduncle spot (vs. no anterior extension of the caudal peduncle spot) and by having a dark lateral stripe overlaid by the peduncular spot and by the regularly distributed pigmentation on scales on the sides of the body (vs. peduncular spot and other body pigments not superimposed over a dark lateral stripe). Hooks present on all fins of males (vs. hooks present only on anal and pelvic fins of males) distinguishes the new species from B. dahli, the only sympatric congener. Seven other diagnostic characters separating the new taxon from B. dahli are reported. We also include physical, chemical and biological habitat parameters and analyse the impacts from mining on this new species and other organisms present at the type locality.

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A new species of Loimopapillosum Hargis, 1955 (Monogenea: Monocotylidae) parasitizing Hypanus dipterurus (Myliobatiformes: Dasyatidae) off the Pacific coast of South America, and its phylogenetic relationships

Journal of Helminthology ◽

10.1017/s0022149x21000262 ◽

2021 ◽

Vol 95 ◽

Author(s):

J.D. Chero ◽

C.L. Cruces ◽

G. Sáez ◽

A.G.L. Oliveira ◽

C.P. Santos ◽

...

Keyword(s):

New Species ◽

South America ◽

Pacific Coast ◽

Male Copulatory Organ ◽

Phylogenetic Analyses ◽

Copulatory Organ ◽

The Pacific ◽

Northern Peru ◽

A New Species ◽

Single Testis

Abstract A new species of Loimopapillosum Hargis, 1955 is described based on specimens collected from the gills of the diamond stingray, Hypanus dipterurus (Jordan & Gilbert, 1880) (Myliobatiformes: Dasyatidae) captured off Puerto Pizarro, Tumbes Region, northern Peru. Loimopapillosum pascuali n. sp. is distinguished mainly from the type and only species, Loimopapillosum dasyatis Hargis, 1955, by its funnel-shaped male copulatory organ, with an asymmetrical base; the superficial root of the anchor with distal knobs; the deep root of the anchor with a constriction at its base; a single testis; and the number of head organs. Available sequences for members of Monocotylidae in the GenBank as well as partial sequences for the gene 28S and 18S ribosomal DNA from L. pascuali n. sp. were included in phylogenetic analyses, suggesting that Loimoinae (represented in this study by L. pascuali n. sp. and Loimosina sp.) is nested within the Monocotylidae Taschenberg, 1879. Therefore, we confirm the rejection of Loimoidae Price, 1936 and its reincorporation as a subfamily of Monocotylidae, as previously suggested. Loimopapillosum pascuali n. sp. represents the first species of this genus in South America.

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Axiopsis caespitosa (Thalassinidea, Axiidae), a new species from the Pacific coast of Colombia

Canadian Journal of Zoology ◽

10.1139/z79-207 ◽

1979 ◽

Vol 57 (8) ◽

pp. 1584-1591 ◽

Cited By ~ 2

Author(s):

H. J. Squires

Keyword(s):

New Species ◽

South America ◽

Pacific Coast ◽

Smithsonian Institution ◽

Median Carina ◽

The Pacific ◽

Female Holotype ◽

Definition Of ◽

A New Species ◽

Strict Definition

Axiopsis (Axiopsis) caespitosa is a new species of the Axiidae from the Pacific coast of Colombia, South America. It has a carina on the carapace behind the cervical groove but is typically axiopsid. One specimen, the female holotype, was trawled in 90 m and is deposited in the Smithsonian Institution, Washington, D.C. The species appears to be the Pacific analogue of the Atlantic species A. (A.) hirsutimana. Differences are fewer spines on the median carina, on the rostrum, and at the transverse suture of the outer uropod, as well as two groups of three spines just behind the cervical groove. Several species of axiid named Calastacus are referred to the genus Axiopsis in view of a strict definition of the former.

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Pentamera fonsecae n. sp. a new species of sea cucumber from the Pacific coast of Costa Rica (Holothuroidea: Dendrochirotida: Thyonidae)

Zootaxa ◽

10.11646/zootaxa.4878.3.9 ◽

2020 ◽

Vol 4878 (3) ◽

pp. 581-588

Author(s):

FRANCISCO ALONSO SOLIS-MARIN ◽

JUAN JOSE ALVARADO ◽

CARLOS ANDRES CONEJEROS-VARGAS ◽

ANDREA ALEJANDRA CABALLERO-OCHOA

Keyword(s):

New Species ◽

Costa Rica ◽

Sea Cucumber ◽

Body Wall ◽

Pacific Coast ◽

The Body ◽

The Pacific ◽

A New Species ◽

Tube Feet

Pentamera fonsecae n. sp. is described from seven specimens as a new species of Thyonidae from the Pacific coast of Costa Rica. It is distinguished from its congeners by having tables with ladder-shaped spires in the body wall, and tube feet with curved support tables of variable height and tables as those found in the body wall slightly smaller than those from the body wall. This species is distributed in Guanacaste, Costa Rica, from 28.5 to 40 m on muddy bottoms.

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A new species of Characidium (Characiformes: Crenuchidae) from small coastal drainages in northeastern Brazil, with remarks on the pseudotympanum of some species of the genus

Neotropical Ichthyology ◽

10.1590/1982-0224-20130168 ◽

2014 ◽

Vol 12 (2) ◽

pp. 333-342 ◽

Cited By ~ 7

Author(s):

Angela M. Zanata ◽

Priscila Camelier

Keyword(s):

New Species ◽

Lateral Line ◽

The Body ◽

Northeastern Brazil ◽

Horizontal Scale ◽

Caudal Peduncle ◽

Transversal Line ◽

Lateral Band ◽

The Family ◽

A New Species

Characidium samurai, a species of the family Crenuchidae apparently endemic to rio das Almas and rio Vermelho basins, Bahia, Brazil, is described. The new species is readily distinguishable from its congeners, except C. lanei, by having a dark lateral band along the head and body that is particularly broad from the rear of the head to the end of the caudal peduncle (1.5 or 2 scales wide) and by the absence of dark bars or blotches on the ventral half of the body. Characidium samurai differs from C. laneiby having the lateral band with straight borders overall (vs.lateral band with somewhat irregular borders due to blotches extending dorsally or ventrally), anal fin ii,7-8 (vs. ii,6), and 4 horizontal scale rows above the lateral line and 4 below (vs. 5/3). It further differs from congeners by a series of features, including isthmus completely covered by scales, lateral line complete with 34-37 perforated scales, 9 scales on the transversal line, 14 scale rows around the caudal peduncle, anal fin ii,7-8, and the absence of dark bars or spots on the fins, except by a faded dorsal-fin bar. The presence of pseudotympanum in four species of Characidium is discussed.

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Poecilia (Pamphorichthys) akroa, a new poeciliid species (Cyprinodontiformes: Poeciliidae) from the Rio Tocantins basin, Brazil

Zootaxa ◽

10.11646/zootaxa.4464.3.9 ◽

2018 ◽

Vol 4461 (3) ◽

pp. 438

Author(s):

CARLOS AUGUSTO FIGUEIREDO ◽

CRISTIANO R. MOREIRA

Keyword(s):

New Species ◽

Sensory System ◽

Color Pattern ◽

Distal Portion ◽

The Body ◽

Caudal Peduncle ◽

Posterior Portion ◽

Anterior Branch ◽

Black Blotch ◽

A New Species

A new species, Poecilia (Pamphorichthys) akroa, is described from the Rio Tocantins drainage, Brazil. The new species differs from the remaining species of the genus by the possession of 10 or 11 pectoral-fin rays, entire preopercular ramus and posterior portion of the supraorbital ramus of the cephalic sensory system enclosed in canals, a faint longitudinal band along the body, a single gonapophysis, a homogeneous reticulate color pattern on sides of body, urogenital region of females heavily pigmented, distalmost segments of the anterior branch (4a) of the fourth gonopodial ray fused into an elongated segment turned anteriorly, subdistal segments of anterior branch (5a) of fifth gonopodial ray simple, without anterior (ventral) projections, dorsal fin with pigmentation at its distal portion and with a basal black blotch, and chromatophores more concentrated on the posterior margin of the mid-ventral scale series of the caudal peduncle and ventrolateral margin of the adjacent scales forming a series of rhombi posterior to anal fin.

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Pseudancistrus sidereus, a new species from southern Venezuela (Siluriformes: Loricariidae) with a redescription of Pseudancistrus

Zootaxa ◽

10.11646/zootaxa.628.1.1 ◽

2004 ◽

Vol 628 (1) ◽

pp. 1 ◽

Cited By ~ 10

Author(s):

JONATHAN W. ARMBRUSTER

Keyword(s):

New Species ◽

Nasal Bone ◽

The Body ◽

Caudal Peduncle ◽

Anterior Process ◽

Males And Females ◽

A New Species

Pseudancistrus sidereus is described from two collections of specimens from Amazonas, Venezuela. Pseudancistrus sidereus differs from all other members of Pseudancistrus based on the presence of a unique keel on the caudal peduncle formed from the concave dorsal sections of the plates in the ventral series, light spots on the body (these may be yellow in life) centered on the body plates and the absence of the characteristics of the more derived members of Pseudancistrus such as hypertrophied odontodes along the snout in males and females and the loss of evertibility of the cheek plates. Pseudancistrus includes Lithoxancistrus and Guyanancistrus and is diagnosed by the following synapomorphies: no suture between pterotic-supracleithrum and hyomandibula, no contact of the hyomandibula with the prootic, straight, spoon-shaped anterior process of metapterygoid, nasal bone not much wider than laterosensory canal running through it, sphenotic not contacting posteriormost infraorbital externally, and a short ventral ridge on the pelvic basipterygium (lost in some species). Two species formerly assigned to Guyanancistrus are placed in different genera. Hypostomus guacharote is placed in Lasiancistrus and Chaetostomus trinitatis is placed in Ancistrus.Se describe Pseudancistrus sidereus, con base en dos colectas de espec menes del Amazonas venezolano. Pseudancistrus sidereus difiere de los otros miembros del g nero Pseudancistrus por la presencia de una quilla nica en el ped nculo caudal formada a partir de las secciones c ncavas dorsales de las placas de la serie ventral, puntos blancos en el cuerpo (probablemente amarillos en vida) centrados en las placas corporales y la ausencia de ciertas caracter sticas presentes en los miembros m s derivados de Pseudancistrus, como odontodos hiperatrofiados a lo largo del rostro en machos y hembras y la perdida de evertibilidad de las placas de la mejilla. Pseudancistrus incluye a Lithoxancistrus y Guyanancistrus y se diagnostica por las siguientes sinapomorf as: sutura entre el pter tico-supracleitro y la hiomand bula ausente, hiomand bula y pro tico sin contacto, proceso anterior del metapterigoides recto y en forma de cuchara, hueso nasal apenas m s amplio que el canal laterosensorial que corre a trav s del mismo, esfen tico sin contacto externo

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Euglossa samperi n. sp., a new species of orchid bee from the Ecuadorian Andes (Hymenoptera: Apidae)

Zootaxa ◽

10.11646/zootaxa.1272.1.3 ◽

2006 ◽

Vol 1272 (1) ◽

pp. 61 ◽

Cited By ~ 9

Author(s):

SANTIAGO RAMÍREZ

Keyword(s):

New Species ◽

Morphological Characters ◽

New Taxon ◽

Orchid Bees ◽

Orchid Bee ◽

The Pacific ◽

A New Species

A new species of orchid bee in the genus Euglossa is here described. Euglossa samperi n. sp. Ramírez occurs on the Pacific foothills of the Ecuadorian Andes. Based on morphological characters, this new taxon is assigned to the subgenus Glossurella, one of the most species-rich, yet poorly known groups of orchid bees.

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