Goodea gracilis

Goodea gracilis
Goodea gracilis
Goodea gracilis
Goodea gracilis
Goodea gracilis
Goodea gracilis
Goodea gracilis
Goodea gracilis
Goodea gracilis
Goodea gracilis
Goodea gracilis
Goodea gracilis
Goodea gracilis
Goodea gracilis
Goodea gracilis
Goodea gracilis
Original Description: 

  HUBBS, C. L. & C. L. TURNER (1939): Studies of the Fishes of the order Cyprinodontes. XVI. A revision of the Goodeidae. Miscellanous Publications (University of Michigan. Museum of Zoology) 42: pp 1 - 80.

Etymology: 

  The species name is derived from the Latin and refers to the slender form of this fish, compared with its congener, Goodea atripinnis.

Holotype: 

  Collection-number: University of Michigan Museum and Zoology, Cat. No. UMMZ-108552.  The Holotype is an adult female with 39mm SL. It has been collected by Gordon, Whetzel and Ross on 21.03.1932.

English Name: 
Slender Goodea
Mexican Name: 
Tiro
Synonyms: 

Goodea caliente   Meek, 1902 (per partem)

Goodea calientis   Regan, 1907 (per partem)

Goodea atripinnis   Meek, 1904 (per partem)

Goodea gracilis   Turner, 1937 (nomen nudum)

Goodea atripinnis calientis   de Buen, 1947

 

Karyotype: 

  The Karyotype describes the number and appearance of chromosomes during the phase of condensation, classified by the position of the centromere (Levan et al., 1964).

The following abbreviations are employed:

 

M = large metacentric chromsome (a result of Robertsonian fusion)

m = small metacentric chromsome (centromere at medium position)

sm = submetacentric chromsome (centromere at submedian position)

smst = submetacentric-subtelocentric chromosome (continous series)

st = subtelocentric chromosome (centromere at subterminal region)

stt = subtelocentric-acrocentric chromosome (continous series)

t = acrocentric chromosome (centromere at terminal region)

 

The Karyotype of Goodea gracilis, following Uyeno, Miller & Fitzsimons, 1983:

2n = 48    2sm/ 46stt  

Size: 
The maximum known SL is about 70mm.
Terra typica: 

  The Holotype has been collected in the Río Santa María (Panuco-system), at Santa María del Río in the state of San Luis Potosí.

Status after IUCN: 

  Vulnerable

Status following other sources: 

not mentioned; included in Goodea atripinnis

Distribution and ESU's: 

This species is distributed on the Atlantic Slope in some upper tributaries of the Río Panuco in the states of Querétaro and San Luis Potosí. It lives also in the ríos Santa Maria and San Juan del Río, maybe also occuring in adjacent areas of the headwaters of the Lerma River basin of the Pacific Slope in the states of Guanajuato and Querétaro (Doadrio & Domínguez, 2004). The recently detected (2010) fish from the Río Metztitlán in Hidalgo may belong to this species, too.

Habitat: 

  The habitats are rivers, creeks and other clear to turbid water bodies. Substrates and vegetation in the habitats are similar to Goodea atripinnis.

 

Jesus Maria dam IJesus Maria dam II

Colouration: 

Hubbs and Turner gave a colouration-description as follows: "Sides with brown spots and blotches thickly set on a cream background, in holotype and other small adults. Larger adults are almost uniform, deep purplish brown, except on yellowish belly, breast and throat. Young with relatively few (about 30) spots, mostly vertically elongate, scattered over sides. Middorsal dusky stripe rather indistinct; axial band on sides rather well developed in small adults, but very weak in young and in large adults; no distinct stripe on lower edge of caudal peduncle. Vertical fins dark, becoming deep dusky in adults; pectoral pale dusky; pelvic clear, mottled, or uniformly dark."

Biology: 

The capture of young indicates, that the reproduction in the Río Panuco basin is from midwinter to late spring (early February to May or June) and may extend throughout autumn (17mm young taken on 23 November),

Diet: 

The species is herbivorous, with similar dentition and gut - length ratio as Goodea atripinnis.

Remarks: 

In 2010, few specimens of the genus Goodea have been found in the Río Metztitlán in the state of Hidalgo, that waters into the Lago Metztitlán. Comparing measures from these five individuals show intermediate results between the two accepted species gracilis and atripinnis, so the final position of this population isn't sure at all. However, following distribution patterns, it should rather belong to Goodea gracilis and is together with the population of Girardinichthys viviparus from the Lago Tecocomulco one of the most eastern distributed populations of Goodeids.