Emendation of the generic diagnosis of Tylocephalum (Cestoda: Lecanicephalidea: Tetragonocephalidae), and description of Tylocephalum brooksi n. sp.

A new species of Tylocephalum is described from the spiral intestine of the cownose ray Rhinoptera bonasus taken off Venezuela. Tylocephalum brooksi n. sp. is the third species described parasitizing this host species, along with T. pingue and T. bonasum. T. brooksi is similar to congeners in the po...

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Detalles Bibliográficos
Publicado: 2000
Materias:
animal
article
cestode
cestodiasis
nonhuman
parasite identification
scolex
taxonomy
tetragonocephalum
tylocephalum bonasum
tylocephalum brooksi
tylocephalum pingue
Animal
Cestoda
Cestode Infections
Fish Diseases
Skates (Fish)
Support, Non-U.S. Gov't
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223395_v86_n5_p1085_Ivanov
http://hdl.handle.net/20.500.12110/paper_00223395_v86_n5_p1085_Ivanov
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00223395_v86_n5_p1085_Ivanov
record_format dspace
spelling paper:paper_00223395_v86_n5_p1085_Ivanov2023-06-08T14:49:53Z Emendation of the generic diagnosis of Tylocephalum (Cestoda: Lecanicephalidea: Tetragonocephalidae), and description of Tylocephalum brooksi n. sp. animal article cestode cestodiasis nonhuman parasite identification scolex taxonomy tetragonocephalum tylocephalum bonasum tylocephalum brooksi tylocephalum pingue Animal Cestoda Cestode Infections Fish Diseases Skates (Fish) Support, Non-U.S. Gov't A new species of Tylocephalum is described from the spiral intestine of the cownose ray Rhinoptera bonasus taken off Venezuela. Tylocephalum brooksi n. sp. is the third species described parasitizing this host species, along with T. pingue and T. bonasum. T. brooksi is similar to congeners in the possession of a scolex with a fungiform pars apicalis, craspedote segmentation, circummedullary vitellarium, external seminal vesicle, bilobed ovary, and medioventral uterus. However, this species differs from all previously described species of Tylocephalum in having a collar around the base of the pars apicalis densely covered by large digitiform processes (microtriches?), and an internal seminal vesicle. The internal seminal vesicle is a feature currently used to differentiate Tetragonocephalum from Tylocephalum. Its presence in T. brooksi indicates that it should be considered a specific instead of a generic character. An emended diagnosis of Tylocephalum is proposed excluding this feature, along with distribution of the testes in the preovarian field and circummedullary distribution of vitelline follicles. Species of Tylocephalum and Tetragonocephalum are reviewed on the basis of original descriptions, and 2 distinct morphological groups of species defined. Species of the Tetragonocephalum group possess a combination of an acraspedote strobila, segments much longer than wide, testes limited to the region anterior to the cirrus sac, vitellarium of lateral bands, conspicuously enlarged genital atrium and pore, cirrus sac dorsal to genital atrium, and bisaccate uterus. Species of the Tylocephalum group differ from Tetragonocephalum in possession of a craspedote strobila, segments more quadrangular, testes distributed throughout the preovarian field, inconspicuous genital atrium, uniformly saccate uterus, cirrus sac lateral to genital atrium, and probable circummedullary vitellaria in all species. 2000 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223395_v86_n5_p1085_Ivanov http://hdl.handle.net/20.500.12110/paper_00223395_v86_n5_p1085_Ivanov
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic animal
article
cestode
cestodiasis
nonhuman
parasite identification
scolex
taxonomy
tetragonocephalum
tylocephalum bonasum
tylocephalum brooksi
tylocephalum pingue
Animal
Cestoda
Cestode Infections
Fish Diseases
Skates (Fish)
Support, Non-U.S. Gov't
spellingShingle animal
article
cestode
cestodiasis
nonhuman
parasite identification
scolex
taxonomy
tetragonocephalum
tylocephalum bonasum
tylocephalum brooksi
tylocephalum pingue
Animal
Cestoda
Cestode Infections
Fish Diseases
Skates (Fish)
Support, Non-U.S. Gov't
Emendation of the generic diagnosis of Tylocephalum (Cestoda: Lecanicephalidea: Tetragonocephalidae), and description of Tylocephalum brooksi n. sp.
topic_facet animal
article
cestode
cestodiasis
nonhuman
parasite identification
scolex
taxonomy
tetragonocephalum
tylocephalum bonasum
tylocephalum brooksi
tylocephalum pingue
Animal
Cestoda
Cestode Infections
Fish Diseases
Skates (Fish)
Support, Non-U.S. Gov't
description A new species of Tylocephalum is described from the spiral intestine of the cownose ray Rhinoptera bonasus taken off Venezuela. Tylocephalum brooksi n. sp. is the third species described parasitizing this host species, along with T. pingue and T. bonasum. T. brooksi is similar to congeners in the possession of a scolex with a fungiform pars apicalis, craspedote segmentation, circummedullary vitellarium, external seminal vesicle, bilobed ovary, and medioventral uterus. However, this species differs from all previously described species of Tylocephalum in having a collar around the base of the pars apicalis densely covered by large digitiform processes (microtriches?), and an internal seminal vesicle. The internal seminal vesicle is a feature currently used to differentiate Tetragonocephalum from Tylocephalum. Its presence in T. brooksi indicates that it should be considered a specific instead of a generic character. An emended diagnosis of Tylocephalum is proposed excluding this feature, along with distribution of the testes in the preovarian field and circummedullary distribution of vitelline follicles. Species of Tylocephalum and Tetragonocephalum are reviewed on the basis of original descriptions, and 2 distinct morphological groups of species defined. Species of the Tetragonocephalum group possess a combination of an acraspedote strobila, segments much longer than wide, testes limited to the region anterior to the cirrus sac, vitellarium of lateral bands, conspicuously enlarged genital atrium and pore, cirrus sac dorsal to genital atrium, and bisaccate uterus. Species of the Tylocephalum group differ from Tetragonocephalum in possession of a craspedote strobila, segments more quadrangular, testes distributed throughout the preovarian field, inconspicuous genital atrium, uniformly saccate uterus, cirrus sac lateral to genital atrium, and probable circummedullary vitellaria in all species.
title Emendation of the generic diagnosis of Tylocephalum (Cestoda: Lecanicephalidea: Tetragonocephalidae), and description of Tylocephalum brooksi n. sp.
title_short Emendation of the generic diagnosis of Tylocephalum (Cestoda: Lecanicephalidea: Tetragonocephalidae), and description of Tylocephalum brooksi n. sp.
title_full Emendation of the generic diagnosis of Tylocephalum (Cestoda: Lecanicephalidea: Tetragonocephalidae), and description of Tylocephalum brooksi n. sp.
title_fullStr Emendation of the generic diagnosis of Tylocephalum (Cestoda: Lecanicephalidea: Tetragonocephalidae), and description of Tylocephalum brooksi n. sp.
title_full_unstemmed Emendation of the generic diagnosis of Tylocephalum (Cestoda: Lecanicephalidea: Tetragonocephalidae), and description of Tylocephalum brooksi n. sp.
title_sort emendation of the generic diagnosis of tylocephalum (cestoda: lecanicephalidea: tetragonocephalidae), and description of tylocephalum brooksi n. sp.
publishDate 2000
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223395_v86_n5_p1085_Ivanov
http://hdl.handle.net/20.500.12110/paper_00223395_v86_n5_p1085_Ivanov
_version_ 1768542823720681472

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