Transitions in functional morphology from "large branchiopods" to Cladocera: Video and confocal microscopic studies of Cyclestheria hislopi (Cyclestherida) and Sida crystallina (Cladocera: Ctenopoda)
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Transitions in functional morphology from "large branchiopods" to Cladocera : Video and confocal microscopic studies of Cyclestheria hislopi (Cyclestherida) and Sida crystallina (Cladocera: Ctenopoda). / Sigvardt, Zandra M. S.; Worsaae, Katrine; Savatenalinton, Sukonthip; Kerbl, Alexandra; Olesen, Jørgen.
In: Journal of Morphology, Vol. 281, No. 10, 2020, p. 1241-1259.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Transitions in functional morphology from "large branchiopods" to Cladocera
T2 - Video and confocal microscopic studies of Cyclestheria hislopi (Cyclestherida) and Sida crystallina (Cladocera: Ctenopoda)
AU - Sigvardt, Zandra M. S.
AU - Worsaae, Katrine
AU - Savatenalinton, Sukonthip
AU - Kerbl, Alexandra
AU - Olesen, Jørgen
PY - 2020
Y1 - 2020
N2 - Great diversity is found in morphology and functionality of arthropod appendages, both along the body axis of individual animals and between different life-cycle stages. Despite many branchiopod crustaceans being well known for displaying a relatively simple arrangement of many serially post-maxillary appendages (trunk limbs), this taxon also shows an often unappreciated large variation in appendage morphology. Diplostracan branchiopods exhibit generally a division of labor into locomotory antennae and feeding/filtratory post-maxillary appendages (trunk limbs). We here study the functionality and morphology of the swimming antennae and feeding appendages in clam shrimps and cladocerans and analyze the findings in an evolutionary context (e.g., possible progenetic origin of Cladocera). We focus onCyclestheria hislopi(Cyclestherida), sister species to Cladocera and exhibiting many "large" branchiopod characters (e.g., many serially similar appendages), andSida crystallina(Cladocera, Ctenopoda), which likely exhibits plesiomorphic cladoceran traits (e.g., six pairs of serially similar appendages). We combine (semi-)high-speed recordings of behavior with confocal laser scanning microscopy analyses of musculature to infer functionality and homologies of locomotory and filtratory appendages in the two groups. Our morphological study shows that the musculature in all trunk limbs (irrespective of limb size) of bothC. hislopiandS. crystallinacomprises overall similar muscle groups in largely corresponding arrangements. Some differences betweenC. hislopiandS. crystallina, such as fewer trunk limbs and antennal segments in the latter, may reflect a progenetic origin of Cladocera. Other differences seem related to the appearance of a specialized type of swimming and feeding in Cladocera, where the anterior locomotory system (antennae) and the posterior feeding system (trunk limbs) have become fully separated functionally from each other. This separation is likely one explanation for the omnipresence of cladocerans, which have conquered both freshwater and marine free water masses and a number of other habitats.
AB - Great diversity is found in morphology and functionality of arthropod appendages, both along the body axis of individual animals and between different life-cycle stages. Despite many branchiopod crustaceans being well known for displaying a relatively simple arrangement of many serially post-maxillary appendages (trunk limbs), this taxon also shows an often unappreciated large variation in appendage morphology. Diplostracan branchiopods exhibit generally a division of labor into locomotory antennae and feeding/filtratory post-maxillary appendages (trunk limbs). We here study the functionality and morphology of the swimming antennae and feeding appendages in clam shrimps and cladocerans and analyze the findings in an evolutionary context (e.g., possible progenetic origin of Cladocera). We focus onCyclestheria hislopi(Cyclestherida), sister species to Cladocera and exhibiting many "large" branchiopod characters (e.g., many serially similar appendages), andSida crystallina(Cladocera, Ctenopoda), which likely exhibits plesiomorphic cladoceran traits (e.g., six pairs of serially similar appendages). We combine (semi-)high-speed recordings of behavior with confocal laser scanning microscopy analyses of musculature to infer functionality and homologies of locomotory and filtratory appendages in the two groups. Our morphological study shows that the musculature in all trunk limbs (irrespective of limb size) of bothC. hislopiandS. crystallinacomprises overall similar muscle groups in largely corresponding arrangements. Some differences betweenC. hislopiandS. crystallina, such as fewer trunk limbs and antennal segments in the latter, may reflect a progenetic origin of Cladocera. Other differences seem related to the appearance of a specialized type of swimming and feeding in Cladocera, where the anterior locomotory system (antennae) and the posterior feeding system (trunk limbs) have become fully separated functionally from each other. This separation is likely one explanation for the omnipresence of cladocerans, which have conquered both freshwater and marine free water masses and a number of other habitats.
KW - F-actin-labeling
KW - high-speed video
KW - musculature
KW - phalloidin staining
KW - swimming antennae
KW - trunk limbs
KW - CYCLESTHERIA-HISLOPI BAIRD
KW - CLAM SHRIMPS CRUSTACEA
KW - ADAPTIVE RADIATION
KW - LARVAL DEVELOPMENT
KW - JAPANESE CONCHOSTRACANS
KW - BRANCHLOPODA CRUSTACEA
KW - LIMB DEVELOPMENT
KW - MALE CLASPERS
KW - EVOLUTION
KW - PHYLOGENY
UR - https://youtu.be/5ohuTTlMwFY
UR - https://youtu.be/4U3vwbR7rHc
U2 - 10.1002/jmor.21244
DO - 10.1002/jmor.21244
M3 - Journal article
C2 - 32815589
VL - 281
SP - 1241
EP - 1259
JO - Journal of Morphology
JF - Journal of Morphology
SN - 0362-2525
IS - 10
ER -
ID: 248598946