A New Genus and Species of Goneplacid Crab (Decapoda: Brachyura) from the West Coast of South and Central America

1986 ◽  
Vol 6 (3) ◽  
pp. 543
Author(s):  
John S. Garth
Keyword(s):  
Central America ◽  
West Coast ◽  
New Genus ◽  
New Genus And Species ◽  
The West

On some deep-sea Stenheliinae from the Gulf of California and the west coast of the Baja California Peninsula (Mexico): Wellstenhelia euterpoides sp. nov., and Wellstenvalia wellsi gen. et sp. nov. (Copepoda: Harpacticoida: Miraciidae)

Zootaxa ◽  
2021 ◽  
Vol 5051 (1) ◽  
pp. 117-150
Author(s):  
SAMUEL GÓMEZ ◽  
JOSÉ ANTONIO CRUZ-BARRAZA
Keyword(s):  
West Coast ◽  
Deep Sea ◽  
Gulf Of California ◽  
New Genus ◽  
Baja California ◽  
Baja California Peninsula ◽  
New Genus And Species ◽  
The West ◽  
Harpacticoid Copepods ◽  
One New Species

At present, only 11 species of harpacticoid copepods have been described from the deep sea of the Gulf of California and the west coast of the Baja California Peninsula. These efforts had until recently been focused exclusively on the families Ameiridae Boeck, Argestidae Por, and Rhizothrichidae Por. Preliminary analyses revealed also an important contribution of the subfamily Stenheliinae Brady (Miraciidae Dana) to the overall species richness and diversity of deep-sea benthic copepods from the west coast of the Baja California Peninsula, and the central and southern Gulf of California. One new species of the genus Wellstenhelia Karanovic & Kim, 2014, We. euterpoides sp. nov., and one new genus and species, Wellstenvalia wellsi gen. et sp. nov., are herein described from sediment samples taken at eight sampling stations in the west coast of the Baja California Peninsula and in the central and southern Gulf of California. Wellstenhelia euterpoides sp. nov. seems to be closely related to We. euterpe Karanovic & Kim, 2014 with which it shares the reduced armature complement of the baseoendopod of the female fifth leg. The so far monotypic genus Wellstenvalia gen. nov. was found to be closely related to Muohuysia Özdikmen, 2009 and Wellstenhelia. Some comments on the relationships between the new genus proposed here and other stenheliin genera and species are provided as a contribution towards the monophyly of the subfamily.  

Ruprechtia in the Miocene El Cien Formation, Baja California Sur, Mexico

IAWA Journal ◽  
2014 ◽  
Vol 35 (4) ◽  
pp. 430-443 ◽  
Author(s):  
Sergio R.S. Cevallos-Ferriz ◽  
Hugo I. Martínez-Cabrera ◽  
Laura Calvillo-Canadell
Keyword(s):  
New Species ◽  
West Coast ◽  
New Genus ◽  
Taxonomic Composition ◽  
Baja California Sur ◽  
New Genus And Species ◽  
The West ◽  
Axial Parenchyma ◽  
The Past ◽  
A New Species

Fossil woods from the El Cien Formation have yielded important information on the taxonomic composition and climate of a flora established in the west coast of Mexico during the Miocene. This report of a new genus and species, Ruprechtioxylon multiseptatus Cevallos-Ferriz, Martínez Cabrera et Calvillo-Canadell, is based on woods with the following combination of features: vessels solitary and in radial multiples of 2–3; vestured, alternate, oval to polygonal intervessel pits; vessel-ray and vessel-parenchyma pits similar in size to intervessel pits, but with slightly reduced to reduced borders; 2–5 septa per fibre; scanty paratracheal, unilateral and vasicentric axial parenchyma; uniseriate homocellular rays, occasionally locally biseriate; crystals in fibres. The presence of Ruprechtioxylon (Polygonaceae) in the El Cien Formation confirms that plants of lineages growing today under contrasting climates lived together in the past. This record adds a new species to the growing list of Neotropical taxa that were present in Mexico prior to the great Plio-Pleistocene exchange of biota in the Americas.

Typhliasina Whitley 1951, an unneeded replacement name for Typhlias Hubbs 1938 (Ophidiiformes: Dinematichthyidae)

Zootaxa ◽  
2017 ◽  
Vol 4319 (2) ◽  
pp. 371
Author(s):  
CHRISTOPHER SCHARPF
Keyword(s):  
Central America ◽  
New Genus ◽  
Yucatan Peninsula ◽  
Freshwater Fishes ◽  
Junior Synonym ◽  
New Genus And Species ◽  
Yucatán Peninsula

Hubbs (1938) described Typhlias pearsei, representing both a new genus and species of blind cusk-eel (Ophidiiformes: Dinematichthyidae) from freshwater caves and sinkholes of the Yucatán peninsula of Mexico. Whitley (1951:67) proposed Typhliasina as a replacement name for Typhlias, citing a list of zoological names published by Neave (1950:284), but did not mention the taxon and author to which the putative senior homonym belonged. Cohen and Nielsen (1978:60) treated Typhliasina as a junior synonym of Ogilbia Jordan & Evermann 1898 in their provisional classification of the Ophidiiformes, wherein they mentioned that Typhlias Hubbs 1938 is preoccupied by Typhlias Bryce 1910 in rotifers. Typhlias Bryce 1910 has subsequently been given as the senior homonym in three important works: the FAO species catalog of ophidiiform fishes (Nielsen & Cohen 1999:134), Checklist of the Freshwater Fishes of South and Central America (Nielsen 2003:507), and a revisionary study (Møller et al. 2004:186) in which Typhliasina is resurrected from the synonymy of Ogilbia. However, a careful reading of Neave (1950) and Bryce (1910) reveals a fact that had apparently been overlooked: Typhlias Bryce 1910 is not an available name, but a lapsus for Typhlina Ehrenberg 1831. 

A new genus and species of polyclad flatworm found in the mantle cavities of gastropod molluscs in the high-intertidal zone of the Pacific coast of Central America

2007 ◽  
Vol 87 (2) ◽  
pp. 429-434 ◽  
Author(s):  
Anno Faubel ◽  
Ronald Sluys ◽  
David G. Reid
Keyword(s):  
Central America ◽  
Intertidal Zone ◽  
New Genus ◽  
Pacific Coast ◽  
New Genus And Species ◽  
Diagnostic Characters ◽  
The Pacific ◽  
Upper Eulittoral ◽  
High Intertidal Zone ◽  
Commensal Relationship

A commensal relationship is described between the polyclad flatworm Paraprostatum echinolittorinae Faubel & Sluys gen. et sp. nov. and gastropod molluscs living on the Pacific coast of central America. Although the worms are relatively large in comparison with their hosts, the latter sustained no apparent damage. Considering the fact that the molluscs live in the upper eulittoral zone and littoral fringe of the shore, it is unlikely that the polyclads could survive for long outside the hosts. Diagnostic characters for the new genus and species are a long penial stylet joined to the proximal vesicle and absence of Lang's vesicle. It is pointed out that Aprostatum clippertoni Bock, 1913 and A. longipenis (Kato, 1943) have been incorrectly transferred to the genus Euplana Girard, 1893 and that Discoplana malagensis Doignon, Artois & Deheyn, 2003 should be transferred to the genus Ilyella Faubel, 1983.

Damnaster tasmani, a new genus and species of Asteoidea (Echinodermata) from New Zealand

1994 ◽  
Vol 8 (6) ◽  
pp. 1397 ◽  
Author(s):  
HES Clark ◽  
DG McKnight
Keyword(s):  
New Zealand ◽  
Deep Water ◽  
New Genus ◽  
New Genus And Species ◽  
The West

Damnaster tasmani, gen. et sp. nov., belonging in the deep-water asteroid family Porcellanasteridae, is described from five stations (nine specimens) to the west of New Zealand, between 35° and 46° S, 156° and 167° E, in depths of 1647 - 4868 m.

Population size, extinction, and speciation: the fission effect in Neogene Bivalvia

Paleobiology ◽  
1986 ◽  
Vol 12 (1) ◽  
pp. 89-110 ◽  
Author(s):  
Steven M. Stanley
Keyword(s):  
Body Size ◽  
Population Size ◽  
Central America ◽  
West Coast ◽  
Large Body ◽  
Geographic Range ◽  
Ice Age ◽  
The West ◽  
Large Body Size ◽  
Species Longevity

The extinction of a species represents reduction of both geographic range and population size to zero. Most workers have focused on geographic range as a variable strongly affecting the vulnerability of established species to extinction, but Lyellian percentages for Neogene bivalve faunas of California and Japan suggest that population size is a more important variable along continental shelves. The data employed to reach this conclusion are Lyellian percentages for latest Pliocene (∼2 ma old) bivalve faunas of California and Japan (N = 245 species). These regions did not suffer heavy extinction during the recent Ice Age, and for each region the Lyellian percentage is 70%–71%.Discrepancies in population size appear to explain the following differences in survivorship to the Recent (Lyellian percentage) for three pairs of subgroups: (1) burrowing nonsiphonate species (42%) versus burrowing siphonate species (84%), which suffer less heavy predation; (2) burrowing nonsiphonate species of small size (73%) versus burrowing nonsiphonate species of large body size (96%); (3) Pectinacea (30%) versus other epifauna (71%), which suffer less heavy predation. During the Mesozoic Era, when predation was less effective in benthic settings, mean species duration for the Pectinacea was much greater (∼20 ma).Along the west coast of North and Central America, mean geographic range is greater for siphonate species of large body size than for siphonate species of small body size and greater still for pectinacean species. These ranges are inversely related to mean species longevity for the three groups, which indicates that geographic range is not of first-order importance in influencing species longevity. Species with nonplanktotrophic development neither exhibit narrow geographic ranges along the west coast of North and Central America nor have experienced high rates of extinction in California and Japan.Rates of extinction are so high for Neogene pectinaceans and nonsiphonate burrowers that without enjoying high rates of speciation these groups could not exist at the diversities they have maintained during the Neogene Period. They are apparently speciating rapidly because of the fission effect: the relatively frequent generation of new species from populations that are fragmented by heavy predation. Thus, ironically, there may be a tendency for high rates of speciation to be approximately offset by high rates of extinction. Only if mean population size for species in a particular group becomes extremely small is it likely to result in a high rate of extinction and a low rate of speciation—and hence a dramatic decline of the group. The fission effect may contribute to the general correlation in the animal world between rate of speciation and rate of extinction.

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