Stenostomum grande Child, 1902

Reyes, Jhoe, Binow, Daniela, Vianna, Rogério T., Brusa, Francisco & Martins, Samantha E., 2021, Fig. 12. Majella pristis n in Periclimenaeus djiboutensis Bruce 1970, Zoological Studies 60 (22), pp. 1-33 : 6-7

Stenostomum grande Child, 1902 ( Fig. 2G )

Synonym: Stenostomum oesophagium Kepner & Carter, 1931 .

Studied material: Twenty-nine individuals studied alive; four whole-mounted individuals observed. The remaining, fixed in alcohol (MZUSP PL 2259).

Localities: Site 1 (23/06/2018; 19/09/2018; 28/02/2019; 1/07/2019), Site 2 (9/10/2018; 30/11/2018; 15/03/2019; 29/05/2019) and Site 3 (24/04/2019; 5/06/2019), associated with benthal and phytal microhabitats.

Description: Live specimens are whitish, with fusiform shaped. They have 1–3 zooids. The body length is 732.3 ± 340.9 μm (466.6–1226.8 μm; n = 4). Individuals follow the descriptions given by Kepner and Carter (1931), Nuttycombe and Waters (1938), Marcus (1945ab) and Noreña et al. (2005b) for S. grande .

Taxonomic remarks: Recently, molecular analyses suggest that S. grande and S. leucops could be a species complex ( Rosa et al. 2015). However, Rosa et al. (2015) did not change the status of S. grande owing to they find no morphological features to propose the taxonomic change. This species is a common inhabitant of lentic freshwater habitats (ponds and lagoons) in southern Brazil ( Braccini et al. 2016; Braccini and Leal-Zanchet 2013; Vara and Leal-Zanchet 2013).

Distribution: This species is widely distributed. It occurs in USA ( von Graff 1911; Kepner and Carter 1931; Nuttycombe and Waters 1938), Russia (Nasonov 1923 and references therein), Finland ( Nassonov 1924), Poland ( Kolasa 1977), Suriname ( Van der Land 1970), Brazil ( Marcus 1945b), Peru ( Noreña et al. 2006b) and Argentina ( Noreña et al. 2005b).

Figures

Fig. 2. Live specimens of Catenulida. (A) Catenula lemnae, chain two zooids. (B–D) Myostenostomum vanderlandi: (B) habitus of whole-mounted individual, (C) detail of the anterior brain lobe and (D) detail of the posterior brain lobe. (E–F) Stenostomum glandulosum: (E) live individual, (F) free-hand schematic representation. (G) Stenostomum grande, a single zooid. (H) Stenostomum paraguayense, intestine with some food items. (I) Stenostomum hemisphericum, free-hand schematic representation.