Stenostomum leucops (Dugès, 1828) O. Schmidt, 1848

Noreña, Carolina, Damborenea, Cristina & Brusa, Francisco, 2005, A taxonomic revision of South American species of the genus Stenostomum O. Schmidt (Platyhelminthes: Catenulida) based on morphological characters, Zoological Journal of the Linnean Society 144 (1), pp. 37-58 : 46-47

publication ID

https://doi.org/ 10.1111/j.1096-3642.2005.00157.x

DOI

https://doi.org/10.5281/zenodo.5113612

persistent identifier

https://treatment.plazi.org/id/8C6887DA-3073-C472-FC25-A05FD5D6AE6B

treatment provided by

Carolina

scientific name

Stenostomum leucops (Dugès, 1828) O. Schmidt, 1848
status

 

Stenostomum leucops (Dugès, 1828) O. Schmidt, 1848 View in CoL

( Fig. 2D View Figure 2 )

Fasciola composita Schrank, 1776

Derostoma leucops Dugès, 1828

Stylacium isabellinum Corda, 1838

Microstomum leucops Ørsted, 1844

Stenostomum torneense Schmidt, 1852 View in CoL

S. neoborecense Girard, 1893

S. tenuicaudatum Nuttycombe & Waters, 1938 View in CoL

S. sthenum Borkott, 1970 View in CoL

S. platycaudatum Borkott, 1970

S. plebejum Borkott, 1970

Description: Length variable. Two-zooid chain 1– 1.75 mm. Cylindrical body. Rounded or pointed anterior end. Posterior end of the body with intestinelacking region forming a tail. Ciliated epithelium with small rhabdites. Epidermic cilia with rigid sensitive cilia at anterior and occasionally at the posterior end. Colour in life yellowish white.

Anterior brain lobes deeply dentate. A pair of type 1 light-refracting bodies associated with the posterior brain lobes.

Oral pore shape variable, rounded, triangular or elongated. Simple muscular pharynx. Two types of pharyngeal glands: type a, abundant at the distal end, opening onto the posterior region of the pharynx; and type b, arranged in bunches lateral to the pharynx, opening onto the anterior end. Excretophores present. Nephridiopore subterminal, in the intestine-lacking region.

Distribution: Cosmopolitan. In South America, margins of the Surinam River, near Paramaribo, Surinam ( Van der Land, 1970); Paraná River, Argentina ( Noreña-Janssen, 1995).

Discussion: Nuttycombe & Waters (1938) consider the validity of this species questionable. This criterion has been followed by Marcus (1945b). These authors consider that the descriptions of this species are so broad and ambiguous as to make its recognition difficult. By contrast, Borkott (1970) in an exhaustive study of Stenostomum leucops subdivides this species into three new species: S. sthenum , S. platycaudatum and S. plebejum . The results of this research did not confirm the existence of these species in South America ( Noreña-Janssen, 1995). Young & Kolasa (1974b) identified specimens from Africa as S. leucops leucops , on the basis of Luther’s (1960) description, ascribing the differences described by Borkott (1970) to those originated in the cultures or not visible in animals captured in natural environments.

In the 1990s, Reuter ( Reuter, 1988, 1991, 1994; Reuter & Palmberg, 1990; Reuter & Eriksson, 1991; Reuter & Kuusisto, 1992; Reuter, Joffe & Palmberg, 1993; Reuter et al., 1995) as well as Wikgren & Thorndyke (1990), Lindroos & Reuter (1991), Palmberg & Reuter (1992) and Grahn et al. (1995) carried out ultrastructural studies of stenostomids, mainly S. leucops . S. sthenum was not mentioned in any of them.

Kingdom

Animalia

Phylum

Platyhelminthes

Class

Turbellaria

Order

Catenulida

Family

Stenostomidae

Genus

Stenostomum

Loc

Stenostomum leucops (Dugès, 1828) O. Schmidt, 1848

Noreña, Carolina, Damborenea, Cristina & Brusa, Francisco 2005
2005
Loc

S. sthenum

Borkott 1970
1970
Loc

S. platycaudatum

Borkott 1970
1970
Loc

S. plebejum

Borkott 1970
1970
Loc

S. tenuicaudatum

Nuttycombe & Waters 1938
1938
Loc

S. neoborecense

Girard 1893
1893
Loc

Stenostomum torneense

Schmidt 1852
1852
Loc

Microstomum leucops Ørsted, 1844

Orsted 1844
1844
Loc

Stylacium isabellinum

Corda 1838
1838
Loc

Derostoma leucops Dugès, 1828

Duges 1828
1828
Loc

Fasciola composita

Schrank 1776
1776
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