Homology and evolution of the antenna in podocopid ostracods from the perspective of aesthetascs.
Antennal podomere homology has not been well documented in podocopid ostracods. Difficulties associated with describing this homology are compounded by the occurrence of specialised podomeres in both cytheroids and bairdioids. Our research establishes the existence of two kinds of aesthetascs shared among multiple higher taxa. Overgrowth "t-setae" are present in males in Cytheroidea, Cypridocopina and Darwinuloidea, and "aesthetasc yc" is found in both sexes in Cytheroidea and Bairdioidea. Homology of the antennal podomeres among all podocopid superfamilies was determined by using the chaetotaxy of these aesthetascs, leading to a description of evolutionary modifications of the podocopid antenna, which suggests that changes in function of the articulation were prompted by the temporal demands of copulatory behavior in each lineage.
Kaji
Tomonari
T
Institute of Geosciences, Shizuoka University, Oya 836, Shizuoka 422-8529, Japan. su26su29su31@hotmail.com
Tsukagoshi
Akira
A
D000818:Animals; D005075:Biological Evolution; D003445:Crustacea / Q000235:genetics* / Q000648:ultrastructure*; D008297:Male; D012679:Sense Organs / Q000000981:diagnostic imaging*; D014463:Ultrasonography