Coronatella monacantha Sars 1901
Creators: name: Sousa, Francisco Diogo Rocha
name: Elmoor-Loureiro, Lourdes Maria Abdu
name: Santos, Sandro
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Branchiopoda
Diplostraca
Coronatella
Coronatella monacantha

description: Coronatella monacantha (Sars, 1901)
(Fig. 11)
= Alona monacantha in Sinev (2004), pg. 9–10, figs. 1–22.
Type locality. Ipiringa, São Paulo state, Brazil. No further comments were made by Sars (1901).
Lectotype. Females, Zoological Museum of Oslo University, sample F12332a.
Other material examined. Six adult parthenogenetic females from the Jurumirim Reservoir, São Paulo, Brazil (23º 16' 35.67"S, 49º 5' 10.94"W), material collected by José Roberto Debastiani-Júnior. Five adult parthenogenetic females from Nhumirim Embrapa Farm, Baía-49, Mato Grosso do Sul, Brazil (19º 00' 14.9"S, 56º 38' 06.9"W), material collected by Valéria Barros on 07.ix.2000 (EL02243). Two adult parthenogenetic females from pond located in Paranã River floodplain, Goiás, Brazil (15º 09’ 15.8"S, 47º 28’ 04.7"W), material collected by Ciro Joko on 20.viii.2003 (EL00717). Seven adult parthenogenetic females from a pond in vicinity of São José do Mipibú, Rio Grande do Norte, Brazil (06º 04' 45"S, 35º 14' 17"W), material collected by Lourdes M. A. Elmoor- Loureiro on 20.vii.1985 (EL02122). Eight adult parthenogenetic females from the Swamp at the Ypioca Farm, São Gonçalo do Amarante, Ceará, Brazil (3º 34’ 39"S, 8º 52’ 31”W), material collected by Maria Beatriz Gomes e Souza on 19.xii.2007.
Comments. The morphology of the studied populations almost completely agrees with the recent redescription of this species (Sinev 2004), with only one exception observed in the inner portion of Limb V. In this appendage, we can observe an inflated element, variable in size, inserted behind the inner setae (Fig. 11 B–C). In the postabdomen, we can observe spinules along the whole dorsal margin of the basal spine (Fig. 11 D). Agreeing with Sinev (2004), we found intrapopulational and interpopulational variations in the denticle on the posteroventral corner of carapace and labral keel (Fig. 11 E–G). The position of the lateral head pores exhibited variation in comparison to data from Sinev (2004) (Fig. 11 K).
C. rectangula C. poppei C. paulinae C. serratalhadensis C. undata sp.nov. C. monacantha
sp.nov. sp.nov.
0.25-0.40 0.30-0.44 0.29-0.33 0.27-0.36 0.24-0.36 0.19-0.30> PP * 1.4 times 2.2 times 1.6 times 1.4 times 2.0 times Labral keel, denticles - - - - - + Ventral setae, groups + + + + - + of ventral setae 30-40 34-40 28-33 28-38 34-38 35 - denticles - - - - two one – groups of spinules - - - three groups - - 1 antennular body/ antennular seta 2.3 2 1.8 1.7 2.8 2.9 length
Nº marginal denticles 6-7 8-9 5-6 5-6 5-6 5-6 Nº lateral fascicles 5 7 5-6 5-6 4-5 6-7 length of basal spine/base of the 2 1.2 1.2 2.6 2.5 2.5 terminal claw
Nº of rows of setules on the limb 7 7 7 6 6 5 ODL seta vs. longest seta of the ODL ≅ IDL ODL ≅ IDL ODL ≅ IDL ODL ≅ IDL ODL <IDL ODL ≅ IDL IDL reduced seta + - - + - - exopodite seta long long absent long rudimentary reduced Nº of setae on the fc 7 7 6 7 6 7 fourth setae of the ex short short long short long long length of seta 3/length of seta 5 2.3 3.2 2.9 2.6 4.2 2.4 length of seta 4/length of seta 5 2.0 3.3 1.9 2.3 1.8 2.3 ex depression between setae 3-4 - - + - + - fc - - + - - -
Distribution and biology. Coronatella monacantha is the most well-known Neotropical species of the genus and occurs in many types of aquatic environments, including artificial ones (Fig. 13). Regarding natural water bodies, this species may be found in permanent and temporary ponds, swamps, lakes, rivers, streams and floodplains (Howelldel et al. 2003; Sousa et al. 2009; Van Damme & Dumont 2010). Populations of C. monacantha in Brazil have been associated with large macrophyte beds, especially Eichornia azurea (Serafim- Junior et al. 2003), and also with slightly acid waters (pH between 4–6). According to Sousa et al. (2011), C. monacantha is very sensitive to environmental conditions, and reductions in water quality can result in morphological abnormalities.
description: Published as part of Sousa, Francisco Diogo Rocha, Elmoor-Loureiro, Lourdes Maria Abdu & Santos, Sandro, 2015, Redescription of Coronatella poppei (Richard, 1897) (Crustacea, Branchiopoda, Chydoridae) and a revision of the genus in Brazil, with descriptions of new taxa, pp. 211-244 in Zootaxa 3955 (2) on pages 233-238, DOI: 10.11646/zootaxa.3955.2.3, http://zenodo.org/record/236039