Gyrodactylus bullatarudis Turnbull, 1956

Rubio-Godoy, Miguel, Paladini, Giuseppe & García-Vásquez, Adriana, 2010, Gyrodactylus jarocho sp. nov. and Gyrodactylus xalapensis sp. nov. (Platyhelminthes: Monogenea) from Mexican poeciliids (Teleostei: Cyprinodontiformes), with comments on the known gyrodactylid fauna infecting poeciliid fish, Zootaxa 2509, pp. 1-29 : 16

Gyrodactylus bullatarudis Turnbull, 1956

( Figure 3 ; Tables 3 , 4 and 7)

Type host: Poecilia (= Lebistes ) reticulata Peters (“guppy”).

New host record: Poecilia mexicana Steindachner (“shortfin molly”, “topote del Atlántico”).

Site of infection: Body and fins.

Type locality: Not known.

New locality records: Río Moctezuma, Vega de Ramírez, Hidalgo, México ( P. mexicana ) (21°03'31''N, 99°28'03''W); Río Pixquiac, Xalapa, Veracruz, México ( X. hellerii ) (19°28'39''N, 96°57'00''W).

Voucher and type material examined: Two voucher specimens ( USNPC 1181–21 and 1181–23) were studied for light microscopy.

Specimens collected and examined for the current study: Four voucher specimens collected from P. mexicana are deposited in the Colección Nacional de Helmintos ( CNHE reg. no. 7133), Instituto de Biología, Universidad Nacional Autónoma de México, México City; and four voucher specimens are deposited in the Parasitic Worm Collection at The Natural History Museum ( BMNH reg. nos. 2010.3.11.1–4), London, UK. Three voucher specimens collected from X. hellerii are deposited in the Colección Nacional de Helmintos ( CNHE reg. no. 7132), Instituto de Biología, Universidad Nacional Autónoma de México, México City; and three voucher specimens are deposited in the Parasitic Worm Collection at The Natural History Museum ( BMNH reg. nos. 2010.3.11.5–7), London, UK.

Comments: Measurements of the haptoral hard parts are provided in Table 3 for the material collected from P. mexicana and X. hellerii . In addition, the re-examination and measurement of the two G. bullatarudis vouchers from P. sphenops are given in Table 4 . The measurement of all specimens provides new data on the dimensions of the body, haptor, pharynx, MCO and the additional morphometric characters proposed by Shinn et al. (2004). The posterior pharynx bulb, however, was not visible on either voucher specimen and no measurements for this structure are provided. The type locality for G. bullatarudis is unknown, as the original description was based on specimens collected from aquarium fish, with no mention of their origin. Harris (1986) discussed the fact that ascertaining the origin of G. bullatarudis is complicated as the host Poecilia reticulata has been globally distributed for mosquito control and the aquarium trade. The vouchers studied in this report originated from Costa Rica.

If the morphology of the marginal hooks alone is considered as the basis of identification and discrimination, then those of G. bullatarudis can be readily distinguished from G. j a ro c h o sp. nov. and G. xalapensis sp. nov. ( Figures 4, 5 ). The sickle base of G. bullatarudis is deep, representing 50% of the length of the sickle; the heel is rhomboid and the toe region has a narrow bridge and a long sloping face to the toe proper which drops below the level of the heel. The sickle shaft is proportionately robust, forward angled which turns abruptly to give a short point which terminates at a position level with the mid-line of the toe. The marginal hook sickle base of G. j a ro c h o sp. nov. while as deep as that of G. bullatarudis , has a more rounded heel and a toe that terminates at a position level with the heel. The sickle shaft of G. jarocho sp. nov., however, curves gently into the point region, terminating in a longer point at a position slightly beyond the level of the toe. The discrimination of the marginal sickle of G. xalapensis sp. nov. from G. bullatarudis is more evident. The sickle base of G. xalapensis sp. nov. is half the depth of G. bullatarudis . The toe bridge of G. xalapensis sp. nov. is more pronounced and flat. The sickle shaft is shorter than that of G. bullatarudis , gently curving, terminating in a long sickle point which extends beyond the toe.

Figures

FIGURES 1 – 14. A size invariant comparison of the marginal hook sickles of two new species of Gyrodactylus with the nine species previously recorded infecting poeciliids. 1. Gyrodactylus jarocho sp. nov.; 2. Gyrodactylus xalapensis sp. nov.; 3. Gyrodactylus bullatarudis Turnbull, 1956 (re-examination); 4. Overlay of G. bullatarudis with G. j a ro c h o sp. nov. (broken line); 5. Overlay of G. bullatarudis with G. xalapensis sp. nov. (broken line); 6. Gyrodactylus costaricensis Kritsky & Fritts, 1970 (re – examination); 7. Overlay of G. costaricensis with G. j a ro c h o sp. nov. (broken line); 8. Overlay of G. costaricensis with G. xalapensis sp. nov. (broken line); 9. Gyrodactylus cytophagus Paperna, 1968 (reexamination); 10. Overlay of G. cytophagus with G. ja ro c ho sp. nov. (broken line); 11. Overlay of G. cytophagus with G. xalapensis sp. nov. (broken line); 12. Gyrodactylus gambusiae Rogers & Wellborn, 1965 (re-examination); 13. Overlay of G. gambusiae with G. j a ro c h o sp. nov. (broken line); 14. Overlay of G. gambusiae with G. xalapensis sp. nov. (broken line). Scale bars = 3 µm.