MEM INST OSWALDO CRUZ, RIO DE JANEIRO, 93(4) Jul/Ago 1998
PAGES: 471-475 DOI: Full paper
Description of the Oocysts of Three New Species of Eimeria (Apicomplexa: Eimeriidae) from Iguanid Lizards (Sauria: Iguanidae) of Central and South America

P Daszak +, SJ Ball

School of Life Sciences, Faculty of Science, Kingston University, Penrhyn Road, Kingston-upon-Thames, Surrey KT1 2EE, U.K.

Abstract

Three new species of Eimeria are described from iguanid lizards of Central and South America. The oocysts of each species have no micropyles or residua and the sporocysts lack Stieda bodies, but all have a sporocyst residuum. Eimeria sanctaluciae n.sp. was found in the St. Lucia tree lizard, Anolis luciae, collected from the Maria Islands, Lesser Antilles. The oocysts are spherical to subspherical, averaging 17.3 x 16.5 µm, with a single layered colourless wall; about 60% contain polar granules. The sporocysts are ellipsoidal and average 7.7 x 5.5 µm.Eimeria liolaemi n.sp. was recovered from the blue-gold swift, Liolaemus taenius, from Chile. The oocysts are spherical to subspherical, measuring 21 x 20.1 µm with a single-layered colourless wall. The sporocysts are subspherical and average 7.4 x 6.8 µm. Eimeria caesicia n.sp. is described from the Brazilian collared iguanid, Tropidurus torquatus. The oocysts measure 27.4 x 23.7 µm, are spherical to subspherical, with a bilayered wall, the outer surface of which appears pale blue in colour, the thin, inner wall appearing brown, when viewed by direct light under the optical microscope. The sporocysts are subspherical and average 9.4 x 7.2 µm. Unnamed polysporocystid oocysts with dizoic sporocysts are reported from the faeces of the lesser St. Vincent tree lizard, Anolis trinitatis and the possibility of spurious parasitism briefly discussed. In addition, oocysts of an unnamed Isospora sp. with a smooth oocyst wall which closely resembles I. reui were recovered from A. trinitatis.

At least 16 species of Eimeria have been named from members of the family Iguanidae (Bastardo de San José 1974, Matuschka & Bannert 1987, Aquino-Shuster et al. 1990, Daszak & Ball 1991, Cisper et al. 1995). During the past five years we have had the opportunity to examine newly imported lizards, as well as lizards collected during two expeditions to the Maria Islands, Lesser Antilles. This work has yielded three new species of Eimeria from iguanids.

 

MATERIALS AND METHODS

Animals were housed individually or only with members of the same species immediately after capture and up to the point of collection of faeces for the present study. Containers were sterilised prior to use with 10% aqueous sodium hypochlorite (Clorox®) for 10 min. Faecal samples were placed in 2.5% potassium dichromate and examined by direct, wet mounts. Oocysts were photographed on a Zeiss photomicroscope III using Nomarski differential interference contrast optics. The oocysts and sporocysts were measured and compared with those already reported from the family Iguanidae. Mean oocyst lengths and widths are given with standard deviations, ranges in parentheses and all measurements in micrometres.

 

RESULTS AND DISCUSSION

Paperna and Landsberg (1989) proposed a new generic name, Acroeimeria, for coccidia of lizards whose endogenous stages develop immediately beneath the brush border of the intestinal epithelial cells, which are displaced into the lumen of the gut and aggregated on the epithelium surface. Mature oocysts contain four sporocysts which are devoid of a Stieda body. We prefer to assign the coccidial oocysts described in the current paper to the genus Eimeria pending study of their endogenous development and a general acceptance of the criteria defining the genus Acroeimeria.

Eimeria sanctaluciae n. sp. (Figs 1-78)

Description: oocysts spherical to subspherical, 17.3 ± 0.6 x 16.5 ± 0.7 (16.0 - 17.6 x 16.0 - 17.6), n = 10; shape index (SI, = mean length/mean width) 1.05. Wall single layered, smooth and colourless, about 1.0 thick, no micropyle or oocyst residuum (Fig. 1). Approximately 60% of oocysts with a polar granule. Sporocysts spherical to subspherical, 7.7 x 5.5 (6.4 - 8.0 x 4.8 - 6.4), n = 10; SI 1.4. Sporocyst residuum present, consisting of 3-4 granules in a homogenous matrix (Figs 1-78). Stieda body absent.

Type hostAnolis luciae, "St. Lucia tree lizard".

Prevalence: oocysts were found in the faeces of 1/3 adult male A. luciae, caught during August 1993 in scrubland on the largest of the two Maria Islands.

Type locality: Maria Islands of St. Lucia, Lesser Antilles.

Type material: due to the constraints of expedition field work, it was impossible to produce type material for this species. However, the drawing (Fig. 8) is a composite based on observations of many oocysts and therefore gives a representation of variation within the species.

Etymology: the specific name reflects the main area of inhabitation by the host species.

Remarks: four other eimerians have been reported from members of the genus AnolisEimeria intermedia from A. intermedius from Costa Rica (Ruiz 1959) has ellipsoidal oocysts, 20.3 x 14.9 with wide ranges of both length and width measurements, and larger sporocysts than those of E. sanctaluciae n.sp. The oocysts of E. anolidis from A. carolinensis (Daszak & Ball 1991) are cylindroidal and about twice the length of the new species. Oocysts of E. schwartzi from A. armouri of The Dominican Republic (Cisper et al. 1995) are ellipsoidal and the ranges of length do not overlap with E. sanctaluciae n.sp. Another eimerian, E. avilae from A. olssoni was described by Cisper et al.(1995) from The Dominican Republic. The oocysts of this species are cylindrical and even larger than E. schwartzi. Of the other oocysts reported from iguanids, those of E. leiocephali from Haiti (Daszak & Ball 1991) are the nearest in appearance to E. sanctaluciae n.sp. but the former are larger, 21 x 19, have a bilayered wall and larger sporocysts.

Eimeria liolaemi n.sp. (Figs 2, 49)

Description: oocysts subspherical, 21 ± 1.1 x 20.1 ± 1.0 (19.4 - 23.8 x 17.7 - 22.9), n = 20. SI 1.08, with a single layered, smooth colourless wall about 1.0 thick, polar granules lacking, no micropyle or oocyst residuum. Sporocysts subspherical/ellipsoidal, 7.4 x 6.8 (7.1 - 8.8 x 6.2 - 7.9), n = 20, SI 1.1. (Figs 49). Globular sporocyst residuum present (Fig. 2). Stieda body absent.

Type-hostLiolaemus pictus, "Orange-flanked Swift".

Prevalence: 1/1 imported adult lizards (faeces collected approximately eight weeks after importation).

Type locality: Chile.

Type material: phototypes submitted to the Natural History Museum, London, UK. Accession numbers: holotype, 1997: 10: 13: 1; paratype, 1997: 10: 13: 2. The phototypes will be digitised and kept in perpetuity in the form of computer files as well as printed micrographs and negatives.

Etymology: the specific name reflects the generic name of the host.

Remarks: of the spherical/subspherical oocysts described from iguanids, those of both E. molochis from Moloch horridus in Queensland (Bovee & Telford 1965) and E. hispidi from the Venezuelan lizard Tropidurus hispidus (Bastardo de San José 1974) are larger. The oocysts ofE. intermedia from A. intermedius in Costa Rica have a single-layered wall and a smaller width to give an SI of 1.36 (Ruiz 1959). E. leiocephali from Leiocephalus carinatus of Haiti (Daszak & Ball 1991) has oocysts that are larger than E. liolaemi n.sp., although there is some overlapping of width and length ranges in the formers lower measurements. However, E. leiocephali oocysts have a few scattered polar granules and spherical sporocysts with compact, finely granular residuum.

Note:further collections of this species from 4/4 individuals of L. taenius from a different imported group revealed a population of oocysts (Figs 29) which were somewhat smaller (19.6 ± 1.6 x 18.6 ± 1.5 (16.8 - 21.2 x 15.9 - 20.3), n = 16, SI 1.06) than the type, with a slight overlap of ranges. The oocyst wall appeared to be bi-layered. The sporocysts also showed differences, 7.2 x 5.6 (6.2 - 7.9 x 5.3 - 7.1), n = 20, SI 1.3. It was felt that this population could not be considered a different species, since differences in number of layers of oocyst walls may be an artifact of diffraction within the microscope.

Eimeria caesicia n.sp. (Figs 310)

Description: oocysts spherical to subspherical, 27.4 ± 1.7 x 23.7 ± 2.3 (24.7 - 30.0 x 21.2 - 28.2), n = 16, SI 1.16. The smooth bilayered wall appears pale blue in colour, with a thin, brown inner wall, when viewed under the optical microscope using a standard light source by which the oocyst walls of other Eimeria species of reptiles, birds and mammals appeared either colourless or pale brown. Polar granules, micropyle and oocyst residuum not present. Sporocysts subspherical, 9.4 x 7.2 (8.8 - 9.7 x 7.1 - 7.9), n = 20, SI 1.3. Sporocyst residuum present as small granules (Fig. 3). Stieda body absent.

Type-hostTropidurus torquatus, "Brazilian collared iguanid".

Prevalence: 1/2 imported adults. Samples taken approximately one month after importation. Infected animal passed oocysts for nine weeks after purchase.

Type locality: Brazil.

Type material: phototypes submitted to the Natural History Museum, London, UK. Accession numbers: holotype, 1997: 10: 13: 3; paratype, 1997: 10: 13: 4. A colour photomicrograph is deposited as a paratype to demonstrate the peculiar oocyst wall. The phototypes will be digitised and kept in perpetuity in the form of computer files as well as printed micrographs and negatives.

Etymology: the specific name relates to the pale blue colour of the oocyst wall.

Remarks: three species of Eimeria have been reported from lizards of the genus Tropidurus. Apart from the distinctive appearance of the oocyst wall of E. caesicia n.sp., the following characteristics distinguish these species. E. hispidi Bastardo de San José, 1974 from T. hispidushas a greater width than E. caesicia n.sp. and has larger sporocysts. E. tropidura and E. galapagoensis, both from T. delanonis of the Galapagos Islands, are ellipsoidal and cylindroidal respectively and have SI values of 1.4 and 2.4 respectively (Aquino-Shuster et al. 1990). Oocysts of E. caesicia n.sp. are larger than those of E. leiocephali, and smaller than those of E. molochis (SI 1.3). Oocysts of E. stenocerci from a lizard of the genus Stenocercus, have a similar length but smaller width to give SI 1.26 - 1.35 (Carini 1940).

Unnamed polysporocystid oocysts (Figs 5-7)

Description: a few oocysts with spherical dizoic sporocysts were found. The number of sporocysts per oocyst varied and oocysts with 7, 8 (Fig. 5), 11 (Fig. 6, two of the sporocysts are out of this field of view), 12, 14 and 16 (Fig. 6) sporocysts were observed. The average size of the oocysts appeared to increase with higher numbers of sporocysts contained, eg. with 8 sporocysts, 30.5 x 26.5 (n = 5), SI 1.15; with 14 sporocysts, 37.5 x 30.8 (n = 3), SI 1.22; with 16 sporocysts, 39.2 x 31.7 (n = 3), SI 1.24. Oocysts are subspherical to ovoidal with a smooth, double layered wall, about 1.0 thick, no micropyle, polar granule or oocyst residuum. Sporocysts spherical to subspherical, sporocyst residuum present consisting of 10-20 scattered granules, 1-1.5 µm in diameter. Stieda body absent.

Type hostAnolis trinitatis Reinhardt & Lütking, 1863, "lesser St. Vincent tree lizard".

Prevalence: oocysts recovered from faecal samples collected from one of two adult male lizards.

Type locality: St. Vincent, Lesser Antilles.

Remarks: McQuistion (1990), when reporting polysporocystid oocysts with dizoic sporocysts found in the faeces of Nesomimus parvulus, the Galapagos mockingbird, suggested caution in naming the host(s) of such parasites due to the possibility of spurious parasitism derived through the diet. The oocysts found by McQuistion (1990) contained 9 -15 (usually 11-14) sporocysts and so differed from the genus Octosporella which contains 8 sporocysts and Hoarella with 16 sporocysts. The oocysts described from A. trinitatis were scarce and passed sporulated, therefore could possibly be placed within the two genera mentioned above or Polysporella McQuistion, 1990. However, they equally fit the description of the genus Adelina (see Levine 1977, 1988) which infects annelids, chilopods and insects.

Polysporocystic oocysts have been previously reported from other vertebrates. Anpilogova (1971) and Barnard et al. (1974) reported Adelina oocysts from faeces of Vulpes vulpes and Hystrix leucura in Tadzhikistan and Sigmodon hispidus in Alabama, USA respectively. Levine et al. (1955), Dorney (1965) and Seville et al. (1992) reported Klossia-like oocysts from North American mammals, and suggested that they were of ingested invertebrate origin. Courtney et al. (1975) reported Adelina oocysts in Sandhill cranes (Grus canadensis), and Parker and Duszinski (1986) reported Adelina oocysts in 1 of 212 New Mexican sandhill crane viscera examined for coccidia.

As far as we are aware, there are only two previous reports of Adelina oocysts from reptiles: Wacha (1972) and Daszak (1995) concerning Thamnophis sirtalis parietalis and Nactus serpensinsula durrelli respectively. The morphology of the Adelina oocysts recovered in low numbers in the faeces of Nactus serpensinsula, a gecko from Round Island, Mauritius have since been identified as an Adelina sp. isolated in large numbers from the centipede Scolopendra abnormis, upon which the lizard preys.

Polysporocystic oocysts were recovered by Arcay de Pereza (1963) from Cnemidophorus l. lemniscatus of Venezuela and described Hoarella garnhami n. gen. n. sp.However, in light of the above discussion, the low prevalence (2/200) reported for H. garnhami and the description of oocyst development, it appears that this genus is in need of re-examination and the oocysts considered spurious parasitism by an invertebrate adeleid coccidian.

Unnamed isosporan oocysts

Oocysts of an isosporan were also recovered from one of the two A. trinitatis faecal samples collected from St. Vincent, however only two oocysts were measured before the sample was lost. These were 16.3 x 15 and 18.8 x 17.5 with ellipsoidal sporocysts of 7.5 width (length not taken). The wall was double-layered and smooth, polar granule not noted in the two oocysts observed. This species appears similar to the only other smooth-walled isosporan reported from Anolis I. reui from A. baharucoensis in the Dominican Republic (Cisper et al. 1995). However, further measurements may reveal differences between these coccidians from geographically widely separated hosts.

 

ACKNOWLEDGEMENTS

To Robert Baltrock and Bradley Whinfield of "The Vivarium", Walthamstow, London, UK and Simon King of "King's Reptiles", Camden, London, UK, for allowing access to their collections of captive reptiles. To Dr Dave Corke, University of East London and the 1993 expedition team (funded in part by the Royal Geographical Society) who collected faecal samples from St. Lucian lizards. The specimen of Liolaemus taenius was kindly loaned by Dr JD Cottingham of Serologicals Inc., Atlanta, USA. The specimen of Tropidurus torquatus was kindly loaned by Duncan Kennedy, Chris Hallett and Hazel Palmer of the University of East London.

 

REFERENCES

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Arcay de Pereza L 1963. Studies on two new coccidia from the Venezuelan lizard Cnemidophorus lemniscatus lemniscatusHoarella garnhami gen. nov., sp. nov. and Eimeria flaviviridis americana subsp. nov. Parasitology 53: 95-107.

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+Corresponding author. Fax: +44-181-547-7562. E-mail:  This e-mail address is being protected from spambots. You need JavaScript enabled to view it.  
Received 10 November 1997
Accepted 17 April 1998

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