Summary
The outer layer of the syncytial epidermis of the cercaria of Cryptocotyle lingua contains five types of membrane bound secretion bodies. Those with fibrillar contents predominate anteriorly and ventrally and are probably responsible for a surface coat to be secreted later. The epidermal cell bodies are consistently divided into a distal portion packed with secretion bodies and a narrow proximal portion containing the nucleus and a small amount of cytoplasm. Cystogenic gland cells of one type containing five types of secretion bodies are permanently connected to the outer epidermis the connection, without exception, containing a single large mitochondrion so that no secretion bodies can enter the epidermis at this stage. The body wall muscles have the characters of slowly contracting fibres but those of the oral sucker are “striated” due to the regular arrangement of dense bodies across the fibres characteristic of more powerfully contracting fibres. Penetration gland cells open into a groove dorsal to the mouth. An arrangement of spines around the groove and a concentration of muscles forms an efficient penetrating apparatus for entry into the second intermediate fish host.
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Abbreviations
- adn:
-
anterior dorsal nerve
- az:
-
attachment zone
- bl:
-
basement lamina
- c:
-
central cell mass
- cc:
-
cystogenic cell
- co:
-
core of secretion body
- cm:
-
circular muscle
- db:
-
dense body
- dec:
-
distal portion of epidermal cell body
- df:
-
dorsal fin
- e:
-
outer epidermis
- ec:
-
epidermal cell body
- ecm:
-
extrinsic circular muscles
- elm:
-
extrinsic longitudinal muscles
- ep:
-
excretory pore
- ev:
-
excretory vessel
- exv:
-
excretory vesicle
- f:
-
fibrous interstitial material
- ger:
-
glandular endoplasmic reticulum
- gl:
-
ß glycogen particles
- gr:
-
groove above oral lobe
- iv:
-
invagination of inner plasma membrane
- l:
-
lipid body
- ll:
-
limiting layer
- lm:
-
longitudinal muscle
- m:
-
mitochondrion
- md:
-
margin or oral depression
- mo:
-
mouth
- mt:
-
microtubule
- my:
-
myoblast
- nu:
-
nucleus
- od:
-
oral depression
- of:
-
oral funnel
- ol:
-
oral lobe
- om:
-
oblique muscle
- opd:
-
opening of penetration gland duct
- opm:
-
outer plasma membrane
- os:
-
oral sucker
- pc:
-
parenchyma cell
- pec:
-
proximal portion of epidermal cell body
- pgc:
-
penetration gland cell
- pgd:
-
penetration gland duct
- pp:
-
protoplasmic process
- ppc:
-
process of parenchyma cell
- pr:
-
photoreceptor
- r:
-
free ribosomes
- rm:
-
radial muscles
- sb:
-
secretion body (1–5)
- sc:
-
sensory cilium
- sp:
-
spine
- spl:
-
sarcoplasm
- sr:
-
sarcoplasmic reticulum
- t:
-
tail
- tp:
-
caudal pocket
- v:
-
vesicle
- vs:
-
ventral sucker rudiment
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Rees, G. The Ultrastructure of the Body Wall and Associated Structures of the Cercaria of Cryptocotyle lingua (Creplin) (Digenea: Heterophyidae) from Littorina littorea (L.). Z. F. Parasitenkunde 44, 239–265 (1974). https://doi.org/10.1007/BF00328765
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DOI: https://doi.org/10.1007/BF00328765