Dugesia sicula Lepori, 1948

Stocchino, Giacinta Angela, 2018, 80 years of research on planarians (Platyhelminthes, Tricladida) from Sardinia, Italy: an annotated checklist, Zootaxa 4532 (4), pp. 539-552: 541

publication ID

https://doi.org/10.11646/zootaxa.4532.4.5

publication LSID

lsid:zoobank.org:pub:807B317B-D883-439F-97B9-B0C0F09D9666

persistent identifier

http://treatment.plazi.org/id/C45EE309-B11A-FFF7-66FB-FE6011F2FA39

treatment provided by

Plazi

scientific name

Dugesia sicula Lepori, 1948
status

 

Dugesia sicula Lepori, 1948  

Dugesia sicula   was first reported for Sardinia on the basis of fissiparous populations, in which a certain percentage of individuals underwent a sexualization process, from 12 Sardinian localities, including 2 small nearby islets (spring and wells on the Tavolara Island Protected Area and watercourses on the S. Antioco Island) (Pala et al., 1995) ( Fig. 1 View FIGURE 1 ). After several years other fissiparous populations were found in two other watercourses, one in the northwestern Asinara Island National Park (Rio d’Auteri reservoir) ( Stocchino, 2003) and another in southeastern Sardinia (Fiume Quirra) (M. Pala, pers. comm.) ( Fig. 1 View FIGURE 1 ). All Sardinian populations showed a coastal distribution with a high degree of tolerance to variations in environmental factors, especially temperature and watercourses hydrological regime e.g. temporary water (Pala et al., 1995; G.A. Stocchino, pers. obs.).

Dugesia sicula   has a pan-Mediterranean geographic range where it is mostly represented by fissiparous populations with only a few sexual populations being present in Mallorca, Algeria, Tunisia and Israel. Two mixed populations, including both sexual and fissiparous individuals, were reported from Sicily (Stocchino & Manconi 2013 and references therein). A recent reassessment of the taxonomic status of D. biblica Benazzi & Banchetti, 1973   from Israel and Turkey, based on morphological and molecular studies, considered this species to be a junior synonym of D. sicula ( Solà et al., 2015)   .

As for karyology, numerous studies confirmed a diploid condition for sexual populations with a chromosome complement of 2n = 18; n = 9, and a triploid condition for fissiparous populations with a chromosome complement of 3n = 27; n = 9 + 1-5 B-chromosomes (see Stocchino et al., 2012 and references therein).

Among Dugesia species, the haploid complement of nine chromosomes of D. sicula   is shared with only five other species: D. maghrebiana Stocchino et al., 2009   , from North Africa; D. arabica Harrath & Sluys, 2013   from Yemen; D. aethiopica Stocchino et al., 2002   and D. afromontana Stocchino & Sluys, 2012   from the Afrotropical region; D. bifida Stocchino & Sluys, 2014   from Madagascar ( Stocchino et al., 2002, 2004, 2009, 2012, 2014; Harrath et al., 2013).

Although D. sicula   is extremely widespread, a molecular analyses on many fissiparous populations from its entire distributional range revealed a remarkable pattern of low interpopulation genetic variability, which was interpreted as the result of recent anthropochore colonizations after triploidization of sexual diploid populations ( Lazaro et al., 2009).

Kingdom

Animalia

Phylum

Platyhelminthes

Class

Rhabditophora

Order

Tricladida

Family

Dugesiidae

Genus

Dugesia

Loc

Dugesia sicula Lepori, 1948

Stocchino, Giacinta Angela 2018
2018
Loc

D. sicula ( Solà et al., 2015 )

Sola 2015
2015
Loc

D. biblica

Benazzi & Banchetti 1973
1973
Loc

Dugesia sicula

Lepori 1948
1948