To each his own: no evidence of gyrodactylid parasite host switches from invasive poeciliid fishes to Goodea atripinnis Jordan (Cyprinodontiformes: Goodeidae), the most dominant endemic freshwater goodeid fish in the Mexican Highlands

Table 5 Aspect ratio of the hamuli of Gyrodactylus spp. infecting goodeid and poeciliid fishes

Fish host	Gyrodactylus spp.	HPSW	HTL	Ratio HPSW/HTL^a	Mean HTL	Mean ratio	Aspect
G. atripinnis	G. tomahuac n. sp. (type-locality)	7.8	44.9	0.17			Robust
G. atripinnis	G. tomahuac n. sp. (Lerma basin)	8.5	46.4	0.18	45.650	0.178	Robust
G. atripinnis	Gyrodactylus sp. 1	9.3	56.6	0.16			Stout
G. atripinnis	Gyrodactylus sp. 2	8.6	56.6	0.15			Slender
G. atripinnis	Gyrodactylus sp. 3	9.8	62.3	0.16	58.500	0.158	Stout
G. multiradiatus	G. lamothei	6.9	46.6	0.15			Slender
G. multiradiatus	G. mexicanus	7.8	46.6	0.17			Robust
Poeciliid fishes	G. actzu	7.8	52.9	0.15			Slender
	G. apazapanensis	9	57.2	0.16			Stout
	G. bullatarudis	9.4	56	0.17			Robust
	G. costaricensis	11.7	71.7	0.16			Stout
	G. cytophagus	7.6	54.2	0.14			Slender
	G. gambusiae	9.9	50.2	0.20			Robust
	G. jarocho	8.6	67.1	0.13			Slender
	G. lhkauhuili	8.4	67.5	0.12			Slender
	G. microdactylus	8.3	52.7	0.16			Stout
	G. milleri	8.1	56.2	0.14			Slender
	G. pictae	9.2	55.2	0.17			Robust
	G. poeciliae	7.9	58.8	0.13			Slender
	G. pseudobullatarudis	7.8	51.3	0.15			Slender
	G. rasini	7.3	50.7	0.14			Slender
	G. takoke	7.7	47.6	0.16			Stout
	G. turnbulli	8.7	57.9	0.15			Slender
	G. unami	6.5	45.6	0.14			Slender
	G. xalapensis	6.8	47.2	0.14			Slender
	G. xtachuna	7.7	53.9	0.14	55.468	0.151	Slender

Note: Measurements of G. lamothei and G. mexicanus are new. Morphometric data of Gyrodactylus spp. infecting poeciliid fishes taken from Rubio-Godoy et al. [25] and García-Vásquez et al. [14]
Abbreviations: HPSW hamulus proximal shaft width, HTL hamulus total length
^aInformal aspect categorisation scale for Ratio HSPW/HTL: Robust (> 0.17), Stout (= 0.16), Slender (< 0.15)

ISSN: 1756-3305