Comparative Parasitology 67(1) 2000 - Peru State College

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COMPARATIVE PARASITOLOGY, <strong>67</strong>(1), JANUARY <strong>2000</strong> sess the diagnostic morphological features of the species. Measurements of the body (247 (Jim long, 80 (Jim wide), haptor (45 u-m long, 70 (xm wide), and pharynx (20 [Am wide) reported by Price (1938) are noticeably smaller than those presented herein, suggesting that the type specimens were strongly contracted as a result of fixation. We do not consider these differences sufficient to warrant description of a new species for the helminths in our collection, since the method of fixation greatly influences the morphometrics of soft body parts. Fixation of our material in hot formalin resulted in extended specimens (Fig. 5), while ambient temperature formalin fixation (the method most likely used by Price, 1938) resulted in contracted specimens with a body length of about half that of those fixed in hot formalin. Haptoral sclerites and the copulatory complex in our specimens correspond morphometrically to respective values provided by Price (1938). Measurements by Molnar et al. (1974) generally fall within the ranges of the combined measurements of Price (1938) and those presented herein, respectively. Although numerous collections of R. guatemalensis were made from cenotes throughout the Yucatan Peninsula (see Scholz et al., 1995), A. chavarriai was found only in Ixin-ha Cenote. This suggests an apparent limited distribution of the species in the Yucatan Peninsula. However, individual collections from Ixin-ha Cenote conducted at different periods of 1997-1998 showed intensity levels of A. chavarriai relative to the other dactylogyrid species (Aphanoblastella travossosi) on this host to vary from being predominant (^95%) to nearly insignificant (
er, and Boeger, 1986, and Amphocleithrium Price and Gonzalez-Romero, 1969, by having tandem gonads, nondilated hook shanks each with 1 subunit, counterclockwise rings in the male copulatory organ, a seminal vesicle formed by a simple dilation of the vas deferens, a sinistral vaginal pore, and a nonsclerotized vagina. It differs from Cosmetocleithrum by lacking 2 submedial projections on the dorsal bar and by having well-developed eyes (Kritsky et al., 1986). Aphanoblastella differs from Amphocleithrium by possessing 2 pairs of eyes and a nonarticulated male copulatory organ and accessory piece (Suriano and Incorvaia, 1995). The internal anatomy of species of Aphanoblastella is also identical to that of Demidospermus Suriano, 1983, as emended by Kritsky and Gutierrez (1998). Aphanoblastella differs from Demidospermus spp. by possessing short ventral bars with a medial process (ventral bars elongate, V- or W-shaped, lacking a medial process in Demidospermus}. Thumbs of hook pairs 5 and 6 are modified in species of Demidospermus (see Kritsky and Gutierrez, 1998), whereas all hooks are similar and unmodified in Aphanoblastella spp. Three previously described species of Urocleidoides (sensu lato) from Rhamdia spp., U. travassosi (Price, 1938), U. robustus Mizelle and Kritsky, 1969, and U. mastigatus Suriano, 1986, are transferred to Aphanoblastella as A. travassosi (Price, 1938) comb, n., A. robustus (Mizelle and Kritsky, 1969) comb, n., and A. mastigatus (Suriano, 1986) comb, n., respectively. Aphanoblastella travassosi comb. n. is the type species and therefore defines the new genus. Aphanoblastella mastigatus comb. n. also is clearly a member of the genus based on the original description (compare figures and description in Suriano, 1986a). Aphanoblastella mastigatus appears to be the sister species of A. travassosi. The original description of U. robustus by Mizelle and Kritsky (1969) was based on unstained and cleared specimens mounted in Gray and Wess' medium. Mizelle and Kritsky (1969) described the gonads to be tandem or overlapping, suggesting that the germarium is anterior to the testis with which it may overlap; the type specimens of U. robustus available to us were not useful in confirming gonadal position. Thus, our transfer of this species to Aphanoblastella is based on the original statements by Mizelle and KRITSKY ET AL.—DACTYLOGYRIDS FROM MEXICAN CENOTES 81 Kritsky (1969) concerning gonadal position and on the similar position and morphology of sclerotized haptoral and copulatory structures to those of A. travassosi. Aphanoblastella travassosi (Price, 1938) comb. n. (Figs. 10-18) REDESCRIPTION: Body 282 (204-364; n = 34) long; greatest width 104 (77-127; n = 32) in posterior trunk. Cephalic lobes poorly to moderately developed. Eyes equidistant, posterior pair larger; accessory granules usually uncommon in cephalic region. Pharynx subspherical, 28 (21-33; n = 23) in diameter; esophagus short. Peduncle broad; haptor 55 (45-63; n = 31) wide, 40 (33-50; n = 32) long. Ventral anchor 22 (21-24; n = 13) long, with elongate superficial root, short deep root, straight shaft, curved elongate point; base 16 (14-17; n = 11) wide, variable. Dorsal anchor 24 (21-27; n = 11) long, with well-developed roots, straight shaft, elongate curved point; base 16 (14-18; n = 12) wide. Ventral bar 32 (29-37; n = 10) long, delicate, broadly V-shaped, with posteromedial process directed posteriorly; dorsal bar 37 (31-44; n = 9) long, broadly V-shaped, with narrowed bulbous ends. Hook 13 (12—14; n = 23) long, with protruding thumb, delicate point, fine shank; FH loop about two-thirds shank length. Male copulatory organ 41 (38-45; n = 5) long, a coil of about 2 rings, base of male copulatory organ with small sclerotized plate; diameter of proximal ring 5 (4-6; n = 6). Accessory piece 31 (28-36; n = 4) long, rodshaped, with broad terminal acute tip. Testis ovate, 51 (40-59; n = 19) long, 35 (25-46; n = 18) wide; seminal vesicle indistinct, fusiform, lying to left of male copulatory organ; prostatic reservoir not observed. Germarium 28 (20-44; n = 23) long, 22 (18-25; n = 23) wide, pyriform, comprising comparatively few cells; oviduct, ootype not observed; uterus delicate; vagina a diagonal tube extending to left body margin, vaginal aperture simple; seminal receptacle small. SYNONYMS: Cleidodiscus travassosi Price, 1938; Urocleidoides travassosi (Price, 1938) Molnar, Hanek, and Fernando, 1974. HOST AND LOCALITY: Gills of Rhamdia guatemalensis (Giinther); Ixin-ha Cenote, Yucatan, Mexico (20°37'14"N; 89°06'40"W) (13 June Copyright © 2011, The Helminthological Society of Washington
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January 2000 Number 1 Comparative P
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Comp. Parasitol. 67(1). 2000 pp. 1-
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children. This means, to most of th
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liese, 1995; Marcogliese and Cone,
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ural and human alterations of ecosy
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ternationally and locally; (2) be i
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justify the inclusion of parasites
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phy to understand faunal structure
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Eucestoda) coincided with the diver
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(Hoberg et al., 2000). These studie
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serve biodiversity effectively if e
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Clayton, D. H., and B. A. Walther.
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ham. 1996. Combining data in phylog
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schistosomes. Journal of Parasitolo
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MARCOGLIESE ET AL.—DIPLOSTOMUM SP
Page 31 and 32: MARCOGLIESE HT f^L.—DIPLOSTOMUM S
Page 33 and 34: MARCOGLIESE ET AL.—DIPLOSTOMUM SP
Page 35 and 36: (Latreille, 1804) Brandt and Ratzeb
Page 37 and 38: COADY AND N]CKOL—PLAGIORHYNCHUS C
Page 39 and 40: COADY AND NICKOL—PLAGIORHYNCHUS C
Page 41 and 42: Threlfall, W. 1965. Helminth parasi
Page 43 and 44: strictive traits that were basicall
Page 45 and 46: Cement gland usually small with few
Page 47 and 48: AMIN ET AL.—REVISION OF THE GENUS
Page 49 and 50: AMIN ET AL.—REVISION OF THE GENUS
Page 51 and 52: 17. Trunk spines appearing continuo
Page 53 and 54: Comp. Parasitol. 67(1), 2000 pp. 51
Page 55 and 56: SMALES—POPOVASTRONGYLUS FROM MARS
Page 57 and 58: tion in a circular buccal capsule.
Page 59 and 60: strongylus pluteus differs from P.
Page 61 and 62: garoo from Kangaroo Island (Smales
Page 63 and 64: BURSEY AND GOLDBERG~-/l/VG7aSTOAM O
Page 65 and 66: Table 2. Parasite list for Onychoda
Page 67 and 68: phibian helminths in Japan. VI. Pse
Page 69 and 70: quadrant and 70° in male, 75° in
Page 71 and 72: increase in the number of cuticular
Page 75 and 76: Figures 1-3. Pseudoterranova decipi
Page 77 and 78: AMIN ET M^.—PSEUDOTERRANOVA IN MA
Page 79 and 80: the gill baskets of some hosts were
Page 81: KRITSKY ET AL.—DACTYLOGYRIDS FROM
Page 85 and 86: 1974); P. laticeps Eigenmann, Lagun
Page 89 and 90: MENDOZA-FRANCO ET SCIADICLEITHRUM F
Page 91 and 92: MENDOZA-FRANCO ET AL.—SCIADICLEIT
Page 93 and 94: MENDOZA-FRANCO ET M^.—SCIADICLEIT
Page 95 and 96: PEREZ-PONCE DE LEON ET AL.—DIGENE
Page 103 and 104: Table 2. Continued. Locality* (CNHE
Page 105 and 106: Table 2. Continued. Locality (CNHE
Page 107 and 108: casionally prey on tadpoles and ins
Page 113 and 114: Table 1. Extended. Ctenophorus reti
Page 115 and 116: Table 2. Extended. 3 '£ Oswaldofil
Page 117 and 118: Mediorhynchus orientalis Belopol'sk
Page 119 and 120: 4-5 spines each: 25.0-35.0 (31.4).
Page 121 and 122: Table 1. Previous helminth records
Page 123 and 124: hyrae from a collection of lizards.
Page 125 and 126: WEST ET AL.—RESEARCH NOTES 123 Ta
Page 127 and 128: 1987, and from these only a sample
Page 129 and 130: snakes are part of their diet. The
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Table 2. Published records of helmi
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, , B. K. Sullivan, and Q. A. Truon
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were larvae. Still, we have conclud
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and their habitats. These low paras
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e eligible for election to office.
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New business. Presentation of notes
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Name: MEMBERSHIP APPLICATION 143 AP
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*Edna M. Buhrer *Mildred A. Doss *A
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