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The pattern of a specimen of Pycnogonum litorale (Arthropoda, Pycnogonida) with a supernumerary leg can be explained with the "boundary model" of appendage formation
被引:15
|作者:
Scholtz, Gerhard
[1
]
Brenneis, Georg
[1
,2
]
机构:
[1] Humboldt Univ, Inst Biol, Vergleichende Zool, Philippstr 13, D-10115 Berlin, Germany
[2] Wellesley Coll, Neurosci Program, 106 Cent St, Wellesley, MA 02481 USA
来源:
SCIENCE OF NATURE
|
2016年
/
103卷
/
1-2期
关键词:
Malformation;
Regeneration;
Limb development;
Morphology;
Micro-computed tomography;
Sea spider;
Pantopoda;
PROXIMODISTAL AXIS;
CLONAL ANALYSIS;
INITIATION;
ABNORMALITIES;
MORPHOGENESIS;
REGENERATION;
ORGANIZATION;
ANOMALIES;
SUPPORT;
CRAB;
D O I:
10.1007/s00114-016-1333-8
中图分类号:
O [数理科学和化学];
P [天文学、地球科学];
Q [生物科学];
N [自然科学总论];
学科分类号:
07 ;
0710 ;
09 ;
摘要:
A malformed adult female specimen of Pycnogonum litorale (Pycnogonida) with a supernumerary leg in the right body half is described concerning external and internal structures. The specimen was maintained in our laboratory culture after an injury in the right trunk region during a late postembryonic stage. The supernumerary leg is located between the second and third walking legs. The lateral processes connecting to these walking legs are fused to one large structure. Likewise, the coxae 1 of the second and third walking legs and of the supernumerary leg are fused to different degrees. The supernumerary leg is a complete walking leg with mirror image symmetry as evidenced by the position of joints and muscles. It is slightly smaller than the normal legs, but internally, it contains a branch of the ovary and a gut diverticulum as the other legs. The causes for this malformation pattern found in the Pycnogonum individual are reconstructed in the light of extirpation experiments in insects, which led to supernumerary mirror image legs, and the "boundary model" for appendage differentiation.
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页数:9
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