Morphological abnormality in Artemia Leach, 1819 (Crustacea Anostraca) a specimen with three compound eyes

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143
ACTA ZOOLOGICA BULGARICA
Acta zool. bulg., 71 (1), 2019: 143-144
Short Communication
Introduction
The occurrence of morphological abnormalities have
been occasionally recorded in crustaceans, e.g., non-
equal length of cercopods and swelled second male
antennae in the fairy shrimp Branchipus schaeeri
(see  et al. 2013), intestinal prolapse or skel-
eton breakage in copepods   
  ), non-sexual skeletal abnormali-
ties in the copepod Acartia lilljeborgii (see 
  ) and the deformation
of endopod and exopod of the copepods Boeckella
poppei and Eurytemora velox (see  &
 . As commented by   
(2013), the only abnormality reported for the brine
shrimp Artemia (Branchiopoda: Anostraca) was gy-
nandromorphy (individuals consisting of distinct
male and female tissues whose phenotype is deter-
mined by their own genotypes), including bilateral
and non-bilateral (mosaic) patterns. Here we report a
new type of malformation in genus Artemia.
Materials and Methods

cultured population of the parthenogenetic Artemia
       -

stereomicroscope.
Results
The abnormal Artemia specimen was an adult female,
  

         
0.15 mm in diameter) than the normal compound eye
         
some of the visual pigments of the front eye were dis-
tributed into its eyestalk. Except for the doubling of
the right eye, other morphologic/morphometric char-
-
mal individuals of the same population.
Morphological Abnormality in Artemia Leach, 1819
(Crustacea: Anostraca): A Specimen with Three
Compound Eyes
Muhammad Saleem Chang1,2, Alireza Asem3 & Shi-Chun Sun1*
1
China; E-mail: sunsc@ouc.edu.cn
2
E-mail: 
3asem.alireza@gmail.com
Abstract: An abnormal specimen with three lateral compound eyes was found in a laboratory-cultured population
of the parthenogenetic Artemia

-
tion.
Key words: abnormality, Crustacea, Artemia.
*Corresponding author: sunsc@ouc.edu.cn

144
Chang M. S., Alireza Asem А. & S.-C. Sun
Discussion
Various biological and non-biological causes are
among the probable reasons for morphological de-

breakage of copepods was attributed to unfavourable
abiotic conditions in natural habitats (
 ); aberration in the append-
ages of some copepods was interpreted as a result of
hybridisation or mutation (
or a result of the expression of genetically unstable
morphological characteristics under the combined

environmental factors (  
      
sects were referred to environmental contaminations
( 2000,  et al. 2000,

Artemia was referred to the loss or damage of W sex
chromosome during cleavage (   2013).
The doubling of the compound eye in Artemia is
likely a result of a mistake of organ formation during
the early stages of development. However, why and
how this development error has taken place remain
to be studied.
Acknowledgements: 


References
 P. D. N. & 

cal evolution in the Centropagidae (Copepoda: Calanoida)



cal pattern in Artemia

        



new populations of the copepod Eurytemora velox (



         
Tunicotheres moseri    
theridae), exposed to copper. Archives of Environmental
Contamination and Toxicology 40: 505-510.

phological abnormalities in adult fairy shrimp Branchipus
schae eri

Acar-
tia tonsa     

   
ability and teratology of lower crustaceans (Copepoda and


       
skeletal abnormalities in Acartia lilljeborgii 
 

Coro-
natella monacantha (Cladocera, Anomopoda, Chydoridae)
     



Fig. 1. Dorsal view of the Artemia specimen with three
lateral compound eyes.