Distribution and morphological variation of Synalpheus superus Abele and Kim, 1989 and notes on the distribution of S. fritzmuelleri Coutière, 1909 (Decapoda: Caridea: Alpheidae)

Zootaxa ◽  
2010 ◽  
Vol 2505 (1) ◽  
pp. 65
Author(s):  
MARGARITA HERMOSO-SALAZAR ◽  
VIVIANNE SOLÍS-WEISS
Keyword(s):  
Morphological Variation ◽  
Gulf Of California ◽  
Eastern Pacific ◽  
Single Specimen ◽  
Northern Limit ◽  
Snapping Shrimp ◽  
Intraspecific Morphological Variation

A significant intraspecific morphological variation was observed in the eastern Pacific snapping shrimp Synalpheus superus Kim & Abele, 1989, especially in the proportions of some cephalotoracic appendages. The northern limit of the distribution of S. superus is expanded from Panama to Guerrero, Mexico. We also consider that Synalpheus fritzmuelleriCoutière, 1909 is most probably not an amphi-American species. Its former status as such was due to taxonomic misinterpretations by Hernández Aguilera et al. (1986) and probably by Coutière (1909) himself, although his questionable record of a single specimen of S. fritzmuelleri from the Gulf of California could not be verified, because the specimen could not be located and may be lost.

Synalpheus amintae sp. nov., a new species of sponge–dwelling snapping shrimp (Crustacea: Decapoda: Alpheidae) from Parque Nacional Natural Isla Gorgona, Pacific Coast of Colombia

Zootaxa ◽  
2019 ◽  
Vol 4646 (1) ◽  
pp. 173-188
Author(s):  
GABRIEL E. RAMOS-TAFUR ◽  
REBECA FRANKE-ANTE
Keyword(s):  
New Species ◽  
Gulf Of California ◽  
Pacific Coast ◽  
Distal Segment ◽  
Species Group ◽  
Eastern Pacific ◽  
Valid Species ◽  
Western Atlantic ◽  
Snapping Shrimp ◽  
A New Species

A new species of sponge–dwelling snapping shrimp, Synalpheus amintae sp. nov. from the Parque Nacional Natural Isla Gorgona, Pacific coast of Colombia, is described. This new species pertains to the denominated Synalpheus “Gambarelloides” species group sensu Coutière (1909)—previously known as “Laevimanus” group. It was collected in the southern part of the Island, during episodes of extreme low tides, known locally as “puja”. Synalpheus amintae sp. nov. is closely related to the only two other known species of the S. “Gambarelloides” species group from the eastern Pacific: Synalpheus occidentalis Coutière, 1909, from Gulf of San José, Lower California, and Synalpheus mulegensis Ríos, 1992, from Bahía Concepción, Gulf of California, and can be differentiated from them by the poorly developed distal portion of pollex of the major cheliped, the armature of the distal segment of third maxilliped, and the number of acute teeth of exopodal uropod. A discriminative analysis dealing with other three species of Synalpheus from the western Atlantic, with distinctive pollex of major chela reduced, is presented. A dichotomous key was elaborated to identify the species of Synalpheus “Gambarelloides” species group from the eastern Pacific. The number of valid species described of Synalpheus from the eastern Pacific is increased to 23. 

Distribution and structure of Conocarpus erectus L. (Combretaceae) in the northern limit of the Pacific Ocean (Gulf of California)

2021 ◽  
Vol 209 ◽  
pp. 105645
Author(s):  
Jonathan G. Ochoa-Gómez ◽  
Joanna Acosta-Velázquez ◽  
Carlos A. Anguamea-Valenzuela ◽  
Paulina Martinetto
Keyword(s):  
Pacific Ocean ◽  
Gulf Of California ◽  
Northern Limit ◽  
Conocarpus Erectus ◽  
The Pacific ◽  
The Pacific Ocean

Patterns of morphological diversity among and within arcid bivalve species pairs separated by the Isthmus of Panama

2001 ◽  
Vol 75 (3) ◽  
pp. 590-606 ◽  
Author(s):  
Peter B. Marko ◽  
Jeremy B. C. Jackson
Keyword(s):  
Morphological Variation ◽  
Fossil Record ◽  
Eastern Pacific ◽  
Nominal Species ◽  
Western Atlantic ◽  
Isthmus Of Panama ◽  
Species Pairs ◽  
Recent Species ◽  
Discriminant Analyses ◽  
Collection Sites

Geminate species are morphologically similar sister-species found on either side of the Isthmus of Panama. The existence of all geminates in the tropical Eastern Pacific ocean and the Caribbean Sea is most often explained by vicariance: closure of the Central American Seaway 3.1 to 3.5 Ma simultaneously isolated populations of species with amphi-American distributions. In this paper, we test the potential of morphological measurements for discriminating between Recent geminate species pairs from three genera (Arca, Arcopsis, and Barbatia) in the bivalve family Arcidae and examine the prospects for distinguishing nominal species in the fossil record. Fourteen morphological variables were used to characterize shell shape and multivariate methods were used to discriminate between five Recent species pairs. Collection sites were also used as a priori groups for discrimination to describe patterns of intraspecific morphological variation and to evaluate differences among samples from different geographic regions.On average, 84 percent of specimens within geminate pairs are classified correctly following five separate discriminant analyses with nominal species as the grouping variable. Although all but one arcid species pair are discriminated with high statistical significance, some collection sites within species are highly morphologically distinct. Overall, a large proportion of specimens from each collection locality (79 percent on average) can be classified correctly to site although no single site possessed a multivariate centroid that was significantly different from all other conspecific centroids. The distinctiveness of some collection sites, however, raises the possibility that some nominal species may harbor cryptic species, indicating the need for wider geographic surveys of both molecular and morphological variation within geminate species pairs.The eigenvalue coefficients derived from the Recent samples of one geminate pair (Arca mutabilis and A. imbricata) were used to assess the potential for identifying arcid species in the fossil record. Discriminant analyses of fossil Arca indicate that the forms that characterize Recent A. mutabilis and A. imbricata are present in the fossil record as far back as the Late Early Miocene, in the Cantaure Formation of Venezuela. Because a deep water connection between the Eastern Pacific and Western Atlantic existed until the Middle Miocene, the morphological differences associated with Recent A. mutabilis and A. imbricata likely existed well before the rising Isthmus affected ocean circulation patterns in tropical America. Therefore, despite great overall morphological similarity, these putative geminate species likely have a time of divergence that is at least four times older than final seaway closure. The geographic distribution of fossils also suggests that morphological forms associated with each Recent species had amphi-American distributions both before and after isthmus formation but are now geographically restricted to either side of the isthmus in the Recent fauna.

AN ANALYSIS OF INTERSPECIFIC AND INTRASPECIFIC MORPHOLOGICAL DIFFERENCES IN TWO CLOSELY RELATED SPECIES OF AMBLYSEIUS BERLESE USING METHODS OF NUMERICAL TAXONOMY (ACARINA: PHYTOSEHDAE)

1977 ◽  
Vol 109 (12) ◽  
pp. 1605-1618 ◽  
Author(s):  
D.A. Chant ◽  
R.I.C. Hansell ◽  
H.J. Rowell
Keyword(s):  
Host Plant ◽  
Morphological Variation ◽  
Related Species ◽  
Numerical Taxonomy ◽  
Valid Species ◽  
Closely Related Species ◽  
Multivariate Tests ◽  
Taxonomic Methods ◽  
Morphological Differences ◽  
Intraspecific Morphological Variation

AbstractMorphological variation between two closely related species in the genus Amblyseius Berlese was examined by numerical taxonomic methods. Multivariate tests indicated that A. canadensis Chant and Hansell and A. novaescotiae (Chant) represent two separate and distinct morphological groups. This supports their taxonomic retention as valid species. Intraspecific morphological variation was also examined and found to be correlated with climatic and host plant variables.

scholarly journals Gobiesox lanceolatus, a new species of clingfish (Teleostei:  Gobiesocidae) from Los Frailes submarine canyon, Gulf of California, Mexico

Zootaxa ◽  
2017 ◽  
Vol 4221 (3) ◽  
pp. 393 ◽  
Author(s):  
PHILIP A. HASTINGS ◽  
KEVIN W. CONWAY
Keyword(s):  
New Species ◽  
Posterior Margin ◽  
Gulf Of California ◽  
Baja California ◽  
Submarine Canyon ◽  
Single Specimen ◽  
Dorsal Fin ◽  
Fin Rays ◽  
A New Species ◽  
Pectoral Fin Rays

Gobiesox lanceolatus is described from a single specimen collected from 300 meters depth in the Los Frailes submarine canyon in the southwestern Gulf of California. The "Canyon Clingfish" is unique within Gobiesox in having a lanceolate caudal fin, with the central rays longer than those above and below them. It is also distinguished by 14 dorsal-fin rays (first tiny and unsegmented), 11 anal-fin rays, 28 pectoral-fin rays, anus slightly closer to anal-fin origin than to posterior margin of pelvic disc, and dorsal-fin origin in front of vertical from anus. It is most similar to Gobiesox eugrammus, known from Isla Guadelupe, the coast of outer Baja California and southern California. This is the deepest record for a species of Gobiesox and only four other species of clingfishes are known from greater depths. 

Description of a new scorpionfish (Scorpaenoidei, Sebastolobinae) from the tropical eastern Pacific

Zootaxa ◽  
2009 ◽  
Vol 2277 (1) ◽  
pp. 61-68 ◽  
Author(s):  
PHILIPPE BÉAREZ ◽  
HIROYUKI MOTOMURA
Keyword(s):  
Eastern Pacific ◽  
Dorsal Spine ◽  
Unique Combination ◽  
Single Specimen ◽  
Tropical Eastern Pacific ◽  
Diagnostic Characters ◽  
Dorsal Fin ◽  
Gas Bladder ◽  
Fin Spines

A new spiny scorpionfish, Trachyscorpia verai, is described from a single specimen caught by deepwater longline off Puerto López (Ecuador, Tropical Eastern Pacific). This scorpionfish is distinguished from all other species of Trachyscorpia by a unique combination of characters: dorsal-fin spines 12, vertebrae 26, and gas bladder absent. Other diagnostic characters are: maxilla unscaled, third dorsal spine long, and pelvic spine short. This is the second species of Trachyscorpia known from the TEP and the sixth worldwide.

scholarly journals First data of Iberian Nematomorpha, with redescription of Gordius aquaticus Linnaeus, G. plicatulus Heinze, Gordionus wolterstorffii (Camerano) and Paragordius tricuspidatus (Dufour)

2001 ◽  
Vol 70 (2) ◽  
pp. 73-84 ◽  
Author(s):  
Leonor Cristina de Villalobos ◽  
Ignacio Ribera ◽  
David T. Bilton
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Iberian Peninsula ◽  
Morphological Variation ◽  
Reliable Data ◽  
Intraspecific Morphological Variation ◽  
Scanning Electron ◽  
Ne Spain

Four species of Nematomorpha are recorded from NE Spain, representing the first reliable data on the group in the Iberian peninsula. Gordius aquations Linnaeus, 1758, G. plicatulus Heinze, 1937, Gordionus wolterstorffii (Camerano, 1888) and Paragordius tricuspidatus (Dufour, 1828) are redescribed based on scanning electron microscope observations. Notes on intraspecific morphological variation and ecology of the species are given.

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