The caudal appendage of a larval cestode, the procercoid stage of pseudophyllid cestodes; it may also be found on the cysticercoid larvae of taenioid cestodes, as well as in many of the hymenolepidids (for example, Hymenolepis nana). This appendage frequently bears the hooks originally used by the hexacanth in clawing its way into the intermediate host in which the procercoid or other larval stage develops.
[G. kerkos, tail + meros, part]
Farlex Partner Medical Dictionary © Farlex 2012
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of uterine opening (46) M operculate eggs usually longer than 50 [mu]m (47) La adults with pharynx near oral sucker (48) N lamellated walls in protonephridia (49) N cercomer shifted to ventral surface (50) N single medial excretory vesicle opening postero-dorsally
cercomer (76) La cerebral commissures doubled (77) N posterior nervous system commissures doubled (78) N 12 to 16 hooks on cercomer in larvae (79) La three rows of ciliary epidermal bands in oncomiracidium
(97) N intestine lacking (98) L-N posterior body invagination present (99) N cercomer paedomorphic, reduced in size and at least
(101) F oral sucker/pharynx complex small (102) N ovary follicular (103) F ovary bilobed (104) F testes multiple, in two lateral bands (105) M 10 equal-sized hooks on cercomer in larvae (106) L-La larval epidermis syncitial (107) La vitelloducts syncitial (108) F neodermis does not protrude to surface between epidermal
epidermis and basal lamina (125) N copulatory papilla present (126) M male genital pore and vagina proximate (127) F cercomer totally invaginated during ontogeny (128) La excretory system opens posteriorly in later ontogeny
(129) N hooks on larval cercomer in two size classes (6 large