Temnocephala lutzi Monticelli (Platyhelminthes, Temnocephalida) ectosymbiont on two species of Trichodactylus Latreille (Crustacea, Decapoda, Trichodactylidae) from southern Brazil

Abstract

Temnocephala lutzi Monticelli, 1913, ectosymbiont on brachyuran freshwater crabs of the genus Trichodactylus Latreille, 1828 is recorded for the first time in the State of Rio Grande do Sul, southern Brazil. Two hundred and seventy-nine crabs of two species were examined: 211 Trichodactylus panoplus (von Martens, 1869) and 68 Trichodactylus fluviatilis Latreille, 1828 of which 51 (24.17%) and 28 (41.17%) were positive for T. lutzi, respectively. Crabs of both species carried eggs fixed, exclusively, on the floor of the branchial chambers and/or on the lower side of the gills. Adult as well as young specimens were found inside and outside the branchial chambers. The temnocephalans were always devoid of body pigmentation, although they kept the red eye pigment undiluted in specimens fixed by formalin. The cirrus of T. lutzi showed the typical shape for the species, while the dorsolateral, post tentacular 'excretory' syncytial plates, demonstrated by two special techniques (silver nitrate staining and SEM), appeared with an elliptical shape and a central nephridiopore.

New altitudinal distribution record and updated geographic distribution of the freshwater crab Trichodactylus fluviatilis Latreille, 1828 (Crustacea, Trichodactylidae)

“…Each individual was further inspected for the presence of ectosymbionts. Ectosymbionts were identified as being from the genus Temnocephala Blanchard, 1849, based on the generic description used in Damborenea and Cannon (2001) and Amato et al (2005). Individuals and eggs of Temnocephala adhered to T. fluviatilis body were photographed.…”

“…3c, d). Species of Trichodactylidae, including T. fluviatilis, have been reported as host species of Temnocephala (Amato et al 2005, 2006, Azevedo-Santos and Lima-Stripari 2010.…”

A new flatworm species of Temnocephala (Rhabdocoela, Temnocephalidae) ectosymbiont on the freshwater crab Valdivia serrata (Decapoda, Trichodactylidae) from Amazonas, Colombia

“…Of these, T. ivandarioi sp. nov., T. longivaginata Seixas, Amato & Amato, 2011, and T. lutzi Monticelli, 1913(Amato et al 2005) present a similarsized cirri and have the Amazon River basin as a biogeographical connection. Temnocephala longivaginata and T. ivandarioi sp.…”

“…The cirrus is the only rigid structure and therefore of constant general morphology in juveniles and adults (except for small intraspecific variations) for each species. The morphology of the cirrus constitutes one of the few characters used and is the most valuable taxonomic character for species identification Monticelli, 1913(Amato et al 2005) E Temnocephala microdactyla Monticelli, 1903 FTemnocephala pignalberiae Dioni, 1967(Amato et al 2010) G Temnocephala santafesina Dioni, 1967H Temnocephala trapeziformis Amato, Amato & Seixas, 2006I Temnocephala travassosfilhoi Pereira & Cuocolo, 1941 (Seixas et al 2015b). In the present study, terminology describing the temnocephalan cirrus is updated for neotropical species (Fig.…”

First report of Temnocephala haswelli (Platyhelminthes: Temnocephalida) in Pomacea canaliculata (Mollusca: Ampullariidae) from Brazil: description update based on specimens from the state of Rio Grande do Sul, Brazil

“…To preserve the eyespots' red pigmentation, body shape, and for the purpose of scanning electron microscopy studies (SEM), some specimens were flooded with hot, phosphate-buffered 10% formalin (HF) (AMATO et al 2005(AMATO et al , 2006. The morphology of the dorsolateral 'excretory' syncytial epidermal plates (DLSPs) and the distribution of rhabditogen and disc glands followed AMATO et al (2007).…”