Anm. Naturhist. Mueseum Wien 104 B 5-9 Wien, März 003
Description of Girardinichthys ireneae sp.n. from Zacapu,
Michoacán, Mexico, with remarks on the genera
Girardinichthys BLEEKER, 1860 and Hubbsina DE BUEN, 1941
ALFRED C. RADDA* & MANFRED K. MEYER**
* Institut für Virologie, Universität Wien, Kinderspitalgasse 15, A-1095 Vienna (Austria)
** Schwalheimer Hauptstraße 22, D-61231 Bad Nauheim (Germany)
After some remarks on systematics and taxonomy of the genera Girardinichthys BLEEKER, 1860 an Hubbsina DE BUEN, 1941 a new species Girardinichthys (Hubbsina) ireneae from Zacapu, Michoacán, Mexiko, is described.
Remarks on Girardinichthys BLEEKER, 1860 an Hubbsina DE BUEN, 1941
Until today two species of the genus Girardinichthys and one species of Hubbsina have been described:
Girardinichthys viviparus (BUSTAMANTE, 1837)
Synonyms: G. innominatus BLEEKER, 1860; Limnurgus variegatus GÜNTHER, 1866; Lucania richi GIRARD, 1891; Characodon geddesi REGAN, 1904; Limnurgus innominatus REGAN, 1907.
Distribution area: Distrito Federal de Mexico an neighbouring sites of the State of Mexico.
Girardinichthys multiradiatus (MEEK, 1904)
Synonyms: Characodon multiradiatus MEEK, 1904; Girardinichthys innominatus EVERMANN & GOLDSBOROUGH, 1902; Lermichthys multiradiatus HUBBS, 1926; Girardinichthys limnurgus JORDAN & EVERMANN, 1927.
Distribution area: Drainage of the upper Rio Lerma system.
Hubbsina turneri DE BUEN, 1941
Distribution area: Drainage of the middle Rio Lerma system; type locality: Presa de Cointzio.
With the description of H. turneri DE BUEN in 1941 the author erected a new genus Hubbsina. Examinations of UYENO et al. (1983) provided nearly identical karyotypes of G. innominatus, G. multiradiatus and H. turneri Morphology of the three allopatric species is also very similar. They are characterized by the lack of sensory pores on the preopercle. For the same reason one of us (RADDA 1984) transfered this taxon to Girardinichthys in 1984.
Because of the high similarity of these three species we would therefore strongly suggest to designate Hubbsina as a subgenus of Girardinichtys.
In February 2001 we made a collection trip to the highlands of Central Mexico in order to collect material of some goodeid species, mainly of the genus Allotoca HUBBS and TURNER, 1937. Our twelve collection sites provided the following species: Neoophorus regalis, Allotoca meeki, Allotoca catarinae, Allotoca dugesii, Ilyodon furcidens and Ilyodon xantusi. Goodea atripinnis, Xenotoca variata, Allotoca sp., Zoogoneticus quitzeoensis and Skiffia lermae were found sympatric and syntopic with a form close to Girardinichthys (Hubbsina) turneri at the Laguna de Zacapu, a pond comprising about 33,5 ha at the northwest end of the town of Zacapu. After examination of our material and two specimens collected by Mr. D. Lambert in 1990 (in the collection of the junior author), we decided to describe this form as a new species.
Material an methods
The new species of the genus Girardinichthys is based on 7 specimens caught in the wild and 2 specimens from the collection of M. Meyer. The type specimens will be deposited in the Naturhistorisches Museum Wien an the Museum Senckenberg Frankfurt/Main. 3 specimens were kept alive, in order to produce offspring for further examinations.
Comparative material: The types and description of G. (H.) turneri DE BUEN, (1941). Measurements an counts follow standard practice (MILLER 1948). Measurements were made by vernier callipers reading to 0,1 mm. The number of specimens for all counts is equal to 5. The gill-raker count of the first gill arch includes any gill rakers in the angle of the gill arch. The last two rays in the dorsal fin are counted as a single ray. Vertebral count includes the hypural plate as one vertebra.
Nomenclature of the sensory canal system of the head follows the standard of GOSLINE (1949), that of the gonopodial system follws ROSEN & BAILEY (1963).
ht = Holotype, pt = Paratype, Sl = Standard length, Pdl = Praedorsal length, Pal = Praeanal length, Pvl = Praeventral length, Bh = Body higth, Hl = Head length, Ed = Eye diametre, Snl = Langth of snouth, D = Dorsal fin rays, A = Anal fin rays, Sql = Scales in a longitudinal row, Vert = Number of vertebra, G.r. = Gill rakers.
Genus Girardinichthys BLEEKER, 1860
Diagnosis: Girardinichthys is characteriszed by the higher number of dorsal rays (18-36) in comparison with all other goodeid genera. The daryotype is 2 n = 48 with subtelotelocentric chromosomes. The lack of sensory pores on the preopercle is considered to be a derived trait of the genus.
Girardinichthys (Hubbsina) ireneae sp.n.
Holotype: male (NMW-94578), Sl 22 mm, north end of Laguna de Zacapu Michoacán, Mexico; February 15, 2001, A. C. Radda, Austria an S. M. Calderon, Mexico leg.
Paratypes 2 females (NMW-94579) Sl 17 mm; Feb. 14, 2001, A. C. Radda, Austria, an M. K. Meyer, Germany, same locality leg. 2 Paratypes in collection of M. M. from the same locality, collected in July 1990 by D. Lambert, male Sl 29,2 mm, female Sl 31,5 mm.
In comparison to G. (H.) turneri the new species is characterized by different data of meristics an morphometrics (Tab. 1 - 3):
1. Dorsal ray numbers are lower: 32 - 36 G. (H.) turneri vs. 29 - 30 in G. (H.) ireneae sp.n..
2. Anal ray numbers are slightly higher in G. (H.) ireneae than G. (H.) turneri.
3. Number of scales in a longitudinal row are lower in G. (H.) ireneae (29 - 31) vs. G. (H.) turneri ( 33 - 37).
4. Numbers of vertebra 31 - 32 in G. (H.) ireneae sp.n. vs. 34 in G. (H.) turneri.
5. Gill rakers 9 - 10 (G. (H.) ireneae sp.n.) vs. 12 (G. (H.) turneri).
Tab. 1: Meristic data of four species of the genus Girardinichthys.
G. (H.) turneri
G. (H.) ireneae sp. n.
Tab. 2: Morphometric data of types of G. (H.) ireneae sp.n.
in percentage of standard length (mm)
Tab. 3: Comparison of the morphometric data of G. (H.) turneri and
G. (H.) ireneae sp.n. (percentage of standard length).
G. (H.) turneri
G. (H.) ireneae sp. n.
G. (H.) turnier
G. (H.) ireneae sp. n.
Fig. 1: G. (H.) ireneae sp. n. male, paratype caught in the wild at Laguna de Zacapu.
While females differ only slightly, the figures of the males are more varied.
The picmentation of body and fins is also different in both species. Males of G. (H.) turneri are black in colour of the upper part of the body and in the dorsal; males of G. ireneae sp. n. (as well as females) have numerous dark spots on body an dorsal fin (see Fig. 1).
An important feature is the presence of sensory pores on the preopercle (supraorbital section 5-6), which is absent in the three other Girardinichthys species (see FITZSIMONS 1981).
The new species is named in honor of Mrs. Irene Radda, Vienna, Austria.
The springfed pond is drained by the Angulo River, about 30-35 km NE of Zacapu, which divides in two streams after 20 km; it forms an exorheic basin. Collections were done on February 14 and 15, 2001. On February 14, air temperature = 21 °C, water temperatur = 17 °C, conductivity = 111 uS and 13° German hardness.
In the very densely populated lake the number of specimens of the respective species is very varied: In comparison with G. (H.) ireneae sp.n. and Allotoca sp., we caught almost 10-20 times as many individuals of Zoogoneticus, 10 times as many of Goodea, 5 times as many Skiffia an 2 times as many of Xenotoca.
A shortage of food seems to produce dwarf forms of all goodeid species in the pond. The size of adults ist almost half of ther respective counterparts in other habitats.
We are indebted to Mr. D. Lambert, Lincs, GB, for providing us 2 paratypes of G. (H.) ireneae sp.n. an to Mr. Eduard Pürzl, Vienna, Austria, for providing photographs of the new species.
DE BUEN F., 1941
Un Nuevo Genero de la Familia Goodeidae Perteneciente a la Fauna Ictiologica Mexicana. - Anales de la E. N. de Ciencias Biologicas Vol. II. pp. 133-141
FITZSIMONS, J. M., 1981
Sensory head pores and canals in goodeid fishes. - Occ. Pap. Mus. Zool Univ. Lousiana, St. Univ. 60: 1-10
GOSLINE W. A., 1949
he sensory canals of the head in some cyprinodont fishes, with particular reference to the genus Fundulus. - Occ. Pap. Mus. Zool. Univ. Michigan 519: 1-17
MILLER R. R., 1948
The cyprinodont fishes of the Death Valley system of eastern California and southwestern Nevada. - Misc. Publ. Mus. Zoll. Univ. Michigan, 68: 1-55
RADDA A. C., 1984
Killifische aus aller Welt Bd. 8: Synopsis der Goodeiden Mexikos. - Verl. O. Hofmann, Wien pp. 1-48
ROSEN D. E. & BAILEY R. M., 1963
The poeciliid fishes, their structure, zoogeography, and systematics. - Bull. Am. Mus. Nat. Hist., 126: 1-176
UYENO T., MILLER R. R. &
FITZSIMONS J. N., 1983
Karyology of the Cyprinodontiod fishes of the Mexican family Goodeidae. - Copeia 1983(2): 497-510
Girardinichthys ireneae Radda & Meyer, 2003. Het Aquarium (6): 210-214
A.C. Radda & M.K. Meyer (2003): Description of Girardinichthys ireneae sp.n. from Zacapu, Michoacan, Mexico with remarks on the genera Girardinichthys Bleeker, 1860 and Hubbsina De Buen, 1941. Ann. Naturhist. Mus. Wien