1,721,009 research outputs found
Faunal survey and identification key for the trematodes (Platyhelminthes: Digenea) infecting Potamopyrgus antipodarum (Gastropoda: Hydrobiidae) as first intermediate host
No full textHechinger, Ryan F. (2012): Faunal survey and identification key for the trematodes (Platyhelminthes: Digenea) infecting Potamopyrgus antipodarum (Gastropoda: Hydrobiidae) as first intermediate host. Zootaxa 3418: 1-27, DOI: 10.5281/zenodo.21037
Two 'new' renicolid trematodes (Trematoda: Digenea: Renicolidae) from the California horn snail, Cerithidea californica (Haldeman, 1840) (Gastropoda: Potamididae)
No full textHechinger, Ryan F., Miura, Osamu (2014): Two 'new' renicolid trematodes (Trematoda: Digenea: Renicolidae) from the California horn snail, Cerithidea californica (Haldeman, 1840) (Gastropoda: Potamididae). Zootaxa 3784 (5): 559-574, DOI: http://dx.doi.org/10.11646/zootaxa.3784.5.
FIGURES 6–7. Aporocotylid 2 in Faunal survey and identification key for the trematodes (Platyhelminthes: Digenea) infecting Potamopyrgus antipodarum (Gastropoda: Hydrobiidae) as first intermediate host
No full textFIGURES 6–7. Aporocotylid 2 (large aporocotylid). 6, Sporocyst, live, with developing cercariae. Scale bar = 100. Numerical scale division = 10. 7, Cercaria, live. Scale bar = 100. Numerical scale division = 10.Published as part of Hechinger, Ryan F., 2012, Faunal survey and identification key for the trematodes (Platyhelminthes: Digenea) infecting Potamopyrgus antipodarum (Gastropoda: Hydrobiidae) as first intermediate host, pp. 1-27 in Zootaxa 3418 on page 9, DOI: 10.5281/zenodo.21037
FIGURES 12–14 in Guide to the trematodes (Platyhelminthes) that infect the California horn snail (Cerithideopsis californica: Potamididae: Gastropoda) as first intermediate host
No full textFIGURES 12–14. Austrobilharzia sp. (Aust). 12, Close-up of an infection (white sporocysts) that has presumably invaded an already established Acanthoparyphium spinulosum (Acsp) colony (orange rediae) in a freshly deshelled, horn snail in sea water. The Aust sporocysts have infiltrated the snail gonadal, digestive gland, and green basal visceral mass regions. Scale bar = 0.5 cm. Base photo credit: Todd Huspeni. 13, Sporocyst, live, with developing cercariae, squashed with heavy coverslip pressure. Note the much smaller heterophyid cercaria that was in this mixed-infection. Ocular micrometer unit = 10 µm. Scale bar = 100 µm. 14, Cercaria, live, under slight coverslip pressure. Scale bar = 100 µm.Published as part of Hechinger, Ryan F., 2019, Guide to the trematodes (Platyhelminthes) that infect the California horn snail (Cerithideopsis californica: Potamididae: Gastropoda) as first intermediate host, pp. 459-494 in Zootaxa 4711 (3) on page 469, DOI: 10.11646/zootaxa.4711.3.3, http://zenodo.org/record/358655
Pygidiopsoides spindalis Martin 1951
No full textPygidiopsoides spindalis Martin (13. Pysp; Figs. 1, 53–56) Diagnosis: Parthenitae. Colony comprised of active rediae, densely concentrated in snail gonad region. Rediae almost opaque white to translucent white or grey; ~ 300–400 µm long, oblong to elongate (length:width ~3:1 to 8:1), sausage-shaped. Cercaria. Body mostly translucent colorless; oculate; with oral sucker and no ventral sucker; body ~ 100 µm long, ~equal in length to tail; tail simple. Cercaria behavior: Fresh, emerged cercariae remain in water column, swim ~continuously. Similar species: Pysp is readily separable from the other heterophyids by the lack of a cercaria tail fin, in addition to its relatively short tail, blunt anterior, and small size. Remarks: Martin (1951) described this species from adults obtained by feeding metacercariae from naturally infected Fundulus parvipinnis to chicks and cats. He later documented the life cycle, and described rediae and cercariae from naturally infected California horn snails and metacercariae from experimentally infected second intermediate hosts (Martin 1964). This species likely corresponds to the “small opisthorchioidea” in Martin (1955). Garcia-Vedrenne et al. (2017) presents several lines of evidence indicating that this species has a caste of soldier rediae (however, the in vitro attack trials had limited success).Published as part of Hechinger, Ryan F., 2019, Guide to the trematodes (Platyhelminthes) that infect the California horn snail (Cerithideopsis californica: Potamididae: Gastropoda) as first intermediate host, pp. 459-494 in Zootaxa 4711 (3) on pages 481-482, DOI: 10.11646/zootaxa.4711.3.3, http://zenodo.org/record/358655
Phocitremoides ovale Martin 1950
No full textPhocitremoides ovale Martin (12. Phov; Figs. 1, 49–52) Diagnosis: Parthenitae. Colony comprised of active rediae, densely concentrated in snail gonad region. Rediae translucent white, grey, weak yellow, to colorless; ~ 500–1000 µm long, elongate (length:width ~4:1 to 10:1), sausage-shaped. Cercaria. Body posterior 2/3 opaque white; oculate; with oral sucker and no ventral sucker; body ~ 200 µm long, much shorter than tail (<1/2 length); tail dorso-ventrally finned. Cercaria behavior: Fresh, emerged cercariae remain in water column, swim intermittently in short bursts, with periods of resting and slow sinking. Similar species: Phov is readily distinguished from the other two heterophyids with tail fins by only having a dorso-ventral fin (lacking the proximal lateral fins). Additionally, the penetration gland distribution imparts a distinctive coloration pattern to the body, with the anterior 1/3 being translucent and the posterior 2/3 being more homogeneously white (with reflected light) or dark (with transmitted light). Remarks: Martin (1950c) described Phov and documented its life cycle; he described the rediae and cercariae from natural infections, and metacercariae and adults from experimentally infected second intermediate and final hosts. I suspect that cercariae of this species were accidentally pooled with Acha to comprise Maxon & Pequegnat’s (1949) Pleurolophocercous II. Mature, ripe colonies comprise ~16% the soft-tissue weight of an infected snail (summer-time estimate derived from information in [Hechinger et al. 2009]). Garcia-Vedrenne et al. (2017) presents several lines of evidence indicating that this species has a caste of soldier rediae. However, the in vitro attack trials had limited success.Published as part of Hechinger, Ryan F., 2019, Guide to the trematodes (Platyhelminthes) that infect the California horn snail (Cerithideopsis californica: Potamididae: Gastropoda) as first intermediate host, pp. 459-494 in Zootaxa 4711 (3) on page 481, DOI: 10.11646/zootaxa.4711.3.3, http://zenodo.org/record/358655
Maritrema orensense and Maritrema bonaerense (Digenea: Microphallidae): Descriptions, Life Cycles, and Comparative Morphometric Analyses
Full text linkFil: Alda, Pilar. Centro de Estudios en Parasitología y Vectores (CEPAVE). Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Bonel, Nicolás. Laboratorio de Zoología de Invertebrados I. Departamento de Biología, Bioquímica y Farmacia. Universidad Nacional del Sur. Buenos Aires; ArgentinaFil: Hechinger, Ryan F.. Marine Science Institute and Department of Ecology, Evolution, and Marine Biology. University of California. Santa Barbara. California; USAFil: Martorelli, Sergio Roberto. Centro de Estudios en Parasitología y Vectores (CEPAVE). Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; Argentin
Renicola cerithidicola Martin 1971
No full textRenicola cerithidicola Martin (15. Rece; Figs. 1, 61–64) Diagnosis: Parthenitae. Colony comprised of inactive sporocysts, densely concentrated in snail mantle (in enlarged perirectal sinus). Sporocysts translucent yellow, orange, sometimes white; ~ 500–1500 µm long, ovoid to elongate (length:width up to ~6:1), ~sausage-shaped. Cercaria. Body mostly opaque white; non-oculate; with oral and ventral sucker; with a large Y-shaped excretory bladder, the arms of which wrap around sides of ventral sucker; body ~ 117 µm long, ~equal in length to tail; tail simple. Cercaria behavior: Fresh, emerged cercariae remain in water column, swim ~continuously, lashing tail back and forth. Similar species: Rece is readily distinguished from the two other small renicolid cercariae (Rema [16] and Repo [17]) by its lack of an oral stylet and by the colony locus being in the mantle. Remarks: Martin (1971) described this species based on the sporocysts, cercariae, and experimentally obtained metacercariae (he was able to get only immature adult specimens in young California gulls). Hechinger and Miura (2014) provided COI and ITS1 DNA sequence data for this species. Specimens of this species may have been included, along with specimens of Renicola sp. “polychaetophila”, in the material Hunter (1942) used to describe her “ Cercaria cerithidia 19” (Hechinger & Miura 2014). This species corresponds to the “Y-bladder cercaria” of Martin (1955). Early Rece infections can be detected. The sporocysts appear to typically initially form in the basal visceral mass, as generally expected for species that infects the snail with ingested eggs (Galaktionov & Dobrovolskij 2003) (unpublished observations). Mature, ripe colonies comprise ~17% the soft-tissue weight of an infected snail (summer-time estimate derived from information in [Hechinger et al. 2009]). Rece infection causes (stolen) snail bodies to grow ~ 2x faster than uninfected snails (Hechinger 2010).Published as part of Hechinger, Ryan F., 2019, Guide to the trematodes (Platyhelminthes) that infect the California horn snail (Cerithideopsis californica: Potamididae: Gastropoda) as first intermediate host, pp. 459-494 in Zootaxa 4711 (3) on page 485, DOI: 10.11646/zootaxa.4711.3.3, http://zenodo.org/record/358655
Himasthla Dietz 1909
No full textHimasthla sp. B (7. Hisb; Figs. 1, 27–29) Diagnosis: Parthenitae. Colony comprised of active rediae, densely concentrated in snail gonad with dispersion into basal visceral mass regions. Rediae translucent orange to colorless; ~ 750–2000 µm long, oblong to elongate (length:width up to ~5:1), with posterior appendages that are often not pronounced. Cercaria. Body opaque white; non-oculate; with oral and ventral sucker; with main excretory ducts forming a broad “v”; with basal portions of main excretory ducts being particularly inflated and filled with large, distinct granules; collar with 25 collar spines in a single row, and 4 in a second row (2 pairs of “corner spines”); body ~ 550 µm long, ~equal in length to tail; tail dorso-ventrally finned. Cercaria behavior: Fresh, emerged cercariae remain in water column, swim ~continuously, body ventrally flexed (~forming an overall spheroidal shape), lashing tail back and forth. Similar species: Hisb is most readily distinguished from all the echinostomatoids by having a tail fin. Remarks: The rediae and cercariae of this species have not been thoroughly described. However, Hechinger et al. (2011b) present several aspects of redia morphology. This species corresponds to the ‘fin-tailed echinostome” of Martin (1955) and the “ Echinoparyphium sp.” of Martin (1972), but it has been considered to be a species of Himasthla since Huspeni’s unpublished thesis (2000). Based on observations of natural infections at various stages of development, it appears that the initial mother sporocyst frequently invades the snail heart lumen (first pointed out to me by TC Huspeni; pers. observations). Mature, ripe colonies comprise ~24% the soft-tissue weight of an infected snail (summer-time estimate derived from information in [Hechinger et al. 2009]). Hisb infection causes (stolen) snail bodies to grow ~ 2x faster than uninfected snails (Hechinger 2010). Hisb has a caste of soldier rediae (Hechinger et al. 2011b). In fact, it is first trematode species for which it was documented that trematodes can have a reproductive division of labor and a soldier caste. Nadakal (1960b) presents information on the pigments of the rediae and cercariae of this species (as his “fintailed echinostome”). As part of one of the first studies documenting the syncytial nature of trematode integuments, Bils and Martin (1966) examined the fine structure and development of the tegument for the rediae and cercariae of this species (as Molinella sp.).Published as part of Hechinger, Ryan F., 2019, Guide to the trematodes (Platyhelminthes) that infect the California horn snail (Cerithideopsis californica: Potamididae: Gastropoda) as first intermediate host, pp. 459-494 in Zootaxa 4711 (3) on pages 474-475, DOI: 10.11646/zootaxa.4711.3.3, http://zenodo.org/record/358655
Renicola
No full textRenicola sp. “polychaetophila” (sensu Hechinger and Miura [2014]) (17. Repo; Figs. 1, 71–74) Diagnosis: Parthenitae. Colony comprised of inactive sporocysts, densely concentrated to irregularly clustered in snail gonad region, with dispersion into digestive gland. Sporocysts translucent orange to white; ~ 100–800 µm long, spheroidal to slightly elongate (length:width up to ~4:1). Cercaria. Body mostly opaque white; non-oculate; with oral and ventral sucker; with no tegumental spines; with penetration gland duct opening arrangement of 2[(1+3+1)+1], with 3 pairs opening adjacent to oral stylet, 1 diverging to open more dorsally, 1 ventrally, with 1 separated pair forming characteristic ventral “cross ducts” posterior to oral sucker; with a large Y-shaped excretory bladder, the arms of which wrap around sides of ventral sucker; body ~ 180 µm long, ~equal in length to tail; tail simple. Cercaria behavior: Fresh, emerged cercariae remain in water column, swim ~continuously, lashing tail back and forth. Similar species: Repo is most readily distinguished from Rema [16] by the cercaria penetration gland duct arrangement (particularly the posterior-most “cross ducts”) and lack of tegumental spines. Remarks: Hechinger and Miura (2014) described the sporocysts and cercariae, and provided COI and ITS1 DNA sequence data. This species was not included in Martin (1972), but specimens of it may have been included, along with specimens of Renicola cerithidicola in the material Hunter (1942) used to describe her “ Cercaria cerithidia 19” (Hechinger & Miura 2014). This species, along with Renicola sp. “martini” was previously referred to as “large xiphidiocercaria” in some ecological and evolutionary research (e.g., Hechinger et al. 2007; Kuris 1990). Mature, ripe colonies comprise ~20% the soft-tissue weight of an infected snail (summer-time estimate derived from information on “lgxi” in [Hechinger et al. 2009]). Nadakal (1960b) presents information on the pigments of the sporocysts and cercariae of this species (likely pooled with Renicola sp. “martini”), as his “Y-bladder cercaria”.Published as part of Hechinger, Ryan F., 2019, Guide to the trematodes (Platyhelminthes) that infect the California horn snail (Cerithideopsis californica: Potamididae: Gastropoda) as first intermediate host, pp. 459-494 in Zootaxa 4711 (3) on pages 487-488, DOI: 10.11646/zootaxa.4711.3.3, http://zenodo.org/record/358655
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