Riggenbachiella Alves, de Chambrier, Luque &amp; Scholz in Press 1999
Creators: name: Alves, Philippe Vieira
name: De Chambrier, Alain
name: Luque, José Luis
name: Tomáš Scholz
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Metazoa
Platyhelminthes
Cestoda
Proteocephalidea
Monticelliidae
Riggenbachiella

description: <i>Riggenbachiella</i> n. g. Syn. <i>Chambriella</i> Rego, Chubb &amp; Pavanelli, 1999 (<i>pro parte</i>) <i>Diagnosis</i> Proteocephalidae, Monticelliinae. Small-sized worms. Testes, ovary, vitelline follicles and uterus cortical. Strobila acraspedote, with proglottides variable in shape and size. Scolex quadrilobed, quadrangular in apical view, wider than proliferative zone, with rounded to conical apex; metascolex absent. Suckers large, bi-loculate, with free posterior margin overlapping narrow proliferation zone, well delimited from scolex proper; loculi variable in shape and size. Internal longitudinal musculature formed by small, sparsely distributed bundles of muscle fibres. Testes in one field. Cirrus-sac sigmoid, composed of three parts: large, chambered internal seminal vesicle, middle muscular part with sinuous ejaculatory duct followed by straight, short cirrus with inverted T-shaped ejaculatory duct in its proximal part. Genital pore pre-equatorial, irregularly alternating. Genital atrium present. Ovary bi-lobed, slightly follicular. Vagina anterior, exceptionally posterior to cirrus-sac, with short thickened portion surrounded by ring-like vaginal sphincter. Vitelline follicles arranged in two lateral bands. Uterine development type 2 according to de Chambrier et al. (2004). Parasites of pimelodid catfishes (Siluriformes: Pimelodidae) in the Neotropical Region. <i>Type-species</i>: <i>Riggenbachiella amazonense</i> n. sp. <i>Etymology</i>: This name is given in honour of the late Emil E. Riggenbach, University of Basel, Switzerland, for his contribution to the systematics of proteocephalid cestodes at the end of the 19th Century. The name should be treated as femininum. Remarks The new genus is placed in the Monticelliinae because of the cortical position of the testes, ovary, vitelline follicles and uterus (Rego, 1994). To date, the subfamily includes nine genera parasitising freshwater fishes in the Neotropical region, namely <i>Ageneiella</i> de Chambrier &amp; Vaucher, 1999; <i>Chambriella</i> Rego, Chubb &amp; Pavanelli, 1999; <i>Choanoscolex</i> La Rue, 1911; <i>Goezeella</i> Fuhrmann, 1916; <i>Manaosia</i> Woodland, 1935; <i>Monticellia</i> La Rue, 1911; <i>Regoella</i> Arredondo, de Chambrier &amp; Gil de Pertierra, 2013; <i>Spasskyellina</i> Freze, 1965; and <i>Spatulifer</i> Woodland, 1934. <i>Riggenbachiella</i> n. g. can be readily distinguished from all the above-mentioned taxa by the unique morphology of the cirrus-sac, which is sigmoid and composed of three parts: a voluminous, chambered internal seminal vesicle, a muscular middle part with a sinuous ejaculatory duct, and a straight, short cirrus with an inverted T-shaped ejaculatory duct in its proximal part (see Figs. 4B–F, 5B–D). The new genus can be further differentiated from all but three monticelliine genera by having biloculate suckers instead of uni-loculate ones present in <i>Choanoscolex</i>, <i>Manaosia</i>, <i>Monticellia</i>, <i>Regoella</i>, <i>Spasskyellina</i> and <i>Spatulifer</i>. <i>Riggenbachiella</i> n. g. differs from <i>Ageneiella</i> and <i>Goezeella</i>, which also have bi-loculate suckers, in several features, such as the absence of a metascolex (present in <i>Goezeella</i>), the different development of the inner longitudinal musculature (well-developed in <i>Goezeella</i> and <i>Ageneiella</i>) and unequal extension of the uterine diverticula (branches penetrate into the medulla, sometimes reaching the dorsal cortex in <i>Ageneiella</i>). Another genus with bi-loculate suckers, <i>Chambriella</i> (syn. <i>Lenhataenia</i>, see above), differs from <i>Riggenbachiella</i> n. g. by the morphology of the cirrussac (it has a ‘typical’ structure with a simple internal sperm duct forming several coils, not being enlarged to form an internal seminal vesicle; see Fig. 3B, C in the present paper and figure 42 in de Chambrier &amp; Scholz, 2008).
description: Published as part of <i>Philippe Vieira Alves, Alain de Chambrier, José Luis Luque &amp; Tomáš Scholz, 2017, Untangling convoluted taxonomy of Chambriella Rego, Chubb &amp; Pavanelli, 1999 (Cestoda: Proteocephalidae), with erection of Riggenbachiella n. g. and the description of a new species from pimelodid catfishes in the Neotropical Region, pp. 367-389 in Syst Parasitol 94</i> on pages 372-373, DOI: 10.1007/s11230-017-9700-1, http://zenodo.org/record/925123
description: {"references": ["Rego, A. A., Chubb, J. C., &amp; Pavanelli, G. C. (1999). Cestodes in South American freshwater teleost fishes: keys to genera and brief description of species. Revista Brasileira de Zoologia, 16, 299 - 367.", "de Chambrier, A., Zehnder, M. P., Vaucher, C., &amp; Mariaux, J. (2004). The evolution of the Proteocephalidea (Platyhelminthes, Eucestoda) based on an enlarged molecular phylogeny, with comments on their uterine development. Systematic Parasitolology, 57, 159 - 171.", "Rego, A. A. (1994). Order Proteocephalidea Mola, 1928. In: Khalil, L. F., Jones, A. &amp; Bray, R. A. (Eds) Keys to the Cestode Parasites of Vertebrates. Wallingford: Commonwealth Agricultural Bureaux International, pp. 257 - 293.", "de Chambrier, A., &amp; Vaucher, C. (1999). Proteocephalidae et Monticelliidae (Eucestoda: Proteocephalidea) parasites de poissons d'eau douce du Paraguay avec descriptions d'un genre nouveau et de dix especes nouvelles. Revue Suisse de Zoologie, 106, 165 - 240.", "Gil de Pertierra, A. A., &amp; de Chambrier, A. (2013). Harriscolex nathaliae n. sp. (Cestoda: Proteocephalidea) from Pseudoplatystoma corruscans (Siluriformes: Pimelodidae) in the Parana River basin, Argentina. Journal of Parasitology, 99, 480 - 486.", "Woodland, W. N. F. (1934). On six new cestodes from Amazon fishes. Proceedings of the Zoological Society of London, 104, 33 - 46.", "de Chambrier, A., &amp; Scholz, T. (2008). Tapeworms (Cestoda: Proteocephalidea) of firewood catfish Sorubimichthys planiceps (Siluriformes: Pimelodidae) from the Amazon River. Folia Parasitologica, 55, 17 - 28."]}