scholarly journals Redescription of Ochmacanthus batrachostoma (Miranda-Ribeiro, 1912) (Siluriformes: Trichomycteridae): a possible case of incipient paedomorphism

2016 ◽  
Vol 14 (1) ◽  
Author(s):  
Caio S. Neto ◽  
Mário de Pinna
Keyword(s):  
Body Size ◽  
Internal Anatomy ◽  
Morphometric Traits ◽  
Type Specimens ◽  
Caudal Peduncle ◽  
Caudal Fin ◽  
Maximum Body ◽  
Maximum Body Size

ABSTRACT The lepidophagous stegophiline catfish Ochmacanthus batrachostoma (Miranda-Ribeiro, 1912) is endemic to the Paraná-Paraguai basin and is the only member of its genus in that drainage. It remains a poorly-known taxon mainly due to the historical scarcity of study specimens. The species is herein redescribed on the basis of type and non-type specimens from Brazil, Argentina and Paraguay. Ochmacanthus batrachostoma can be distinguished from congeners by the presence of long maxillary and rictal barbels, reduction of the posterior end of the caudal peduncle, a tadpole-like caudal fin and peduncle, among other morphometric traits and features of internal anatomy. Comparisons show that a number of unique traits of adult O. batrachostoma resemble conditions seen in juvenile specimens of other members of Stegophilinae. Such traits are also more pronounced in juveniles of O. batrachostoma itself. The species also has the smallest maximum body size in Ochmacanthus and among the smallest of any stegophiline. In combination, such observations suggest that the species is paedomorphic, although to a degree less extreme than seen in some other trichomycterids. This is the first possible case of paedomorphosis identified for stegophilines.

MAXIMUM BODY SIZE IN A RADIATING CLADE AS A FUNCTION OF TIME

Evolution ◽  
2005 ◽  
Vol 59 (5) ◽  
pp. 941
Author(s):  
Jerzy Trammer
Keyword(s):  
Body Size ◽  
Maximum Body ◽  
Maximum Body Size

Perisesarma tuerkayi, a new species of mangrove crab from Vietnam (Decapoda, Brachyura, Sesarmidae), with an assessment of its phylogenetic relationships

Crustaceana ◽  
2017 ◽  
Vol 90 (7-10) ◽  
pp. 1155-1175 ◽  
Author(s):  
Adnan Shahdadi ◽  
Peter J. F. Davie ◽  
Christoph D. Schubart
Keyword(s):  
New Species ◽  
Body Size ◽  
Nuclear Dna ◽  
Congeneric Species ◽  
Southern Vietnam ◽  
Mangrove Crab ◽  
Large Maximum ◽  
Maximum Body ◽  
Maximum Body Size ◽  
A New Species

A new species ofPerisesarma,P. tuerkayi, is described from mangroves of Tan Thoi Island, southern Vietnam. Morphologically, the new species differs most significantly from congeners by the tuberculation pattern of the chelar dactylus, its unique G1 morphology, an unusually large maximum body size, and relatively short and broad ambulatory legs. Genetically,P. tuerkayin. sp. is markedly divergent from other congeneric species, both in mitochondrial and nuclear DNA. It is the fifth species ofPerisesarmareported from Vietnam.

Secular Changes in the Body Size of Non-Military Populations

1978 ◽  
Vol 22 (1) ◽  
pp. 616-616
Author(s):  
Howard W. Stoudt
Keyword(s):  
Health Care ◽  
Body Size ◽  
Western Europe ◽  
Economic Status ◽  
The Body ◽  
Past Century ◽  
The Past ◽  
Military Populations ◽  
Maximum Body ◽  
Maximum Body Size

People are getting bigger. Overall increases in body size can be documented for various worldwide populations for which adequate anthropometric data are available. In Western Europe and North America the increase in adult stature over the past century has commonly approximated one centimeter per decade, though with some variability between different groups. Other body dimensions, as well as weight, have also been increasing in both men and women and in different ethnic groups. The most likely explanations for such increases in body size are improved nutrition and better health care during growth years. Since such factors tend to be associated with higher socio-economic status, it is these groups who have demonstrated the most marked increases in body size in recent years. Many upper socio-economic groups have already attained most or all of their maximum body size potential, and will experience little further increase. On the other hand, those presently less favored groups who can still benefit from improved nutrition and health care will continue to show increases in body size until they also have reached their maximum potential.

Two new species of Pleistacantha Miers, 1879 from the Indo-West Pacific region (Crustacea, Decapoda, Majidae)

Zootaxa ◽  
2006 ◽  
Vol 1378 (1) ◽  
pp. 1 ◽  
Author(s):  
SHANE T. AHYONG ◽  
TIMOTHY LEE
Keyword(s):  
New Species ◽  
Body Size ◽  
Deep Water ◽  
Spider Crab ◽  
Pacific Region ◽  
West Pacific ◽  
Two New Species ◽  
Northwestern Australia ◽  
Maximum Body ◽  
Maximum Body Size

Two new species of the deep-water spider crab genus Pleistacantha Miers, 1879, are described: P. griffini sp. nov. and P. maxima sp. nov. Pleistacantha griffini, from northwestern Australia and Indonesia, most closely resembles P. moseleyi (Miers, 1886), with which it has been confused. Pleistacantha griffini is readily distinguished from P. moseleyi based on carapace physiognomy, pereopod morphometrics and gonopod structure. Pleistacantha maxima, ranging from Japan to Australia, has been previously confused with the morphologically similar P. oryx Ortmann, 1893. The new species differs from P. oryx in numerous features, the most striking being a maximum body size exceeding twice that of P. oryx.

scholarly journals Capture the time when plants reach their maximum body size by using the beta sigmoid growth equation

2016 ◽  
Vol 320 ◽  
pp. 177-181 ◽  
Author(s):  
Pei-Jian Shi ◽  
Lei Chen ◽  
Cang Hui ◽  
Henri D. Grissino-Mayer
Keyword(s):  
Body Size ◽  
Growth Equation ◽  
Maximum Body ◽  
Maximum Body Size
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