Pleuroxus varidentatus Frey, 1993
publication ID |
https://doi.org/10.1080/00222930600958870 |
persistent identifier |
https://treatment.plazi.org/id/1A2F87C2-0A06-FF93-049F-FC628EB0FC6D |
treatment provided by |
Carolina (2021-04-01 17:04:21, last updated by Plazi 2023-11-02 04:38:46) |
scientific name |
Pleuroxus varidentatus Frey, 1993 |
status |
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Pleuroxus varidentatus Frey, 1993 View in CoL
( Figures 50–52 View Figures 47–55 )
Pleuroxus varidentatus Frey 1993b, p 177 View in CoL –184, Figures 132–164; Smirnov 1996, p 46 –47, Figures 151–156.
Holotype: a parthenogenetic female 0.62 mm long on a slide in glycerol jelly, deposited in the La Plata Museum, Argentina ( Frey 1993b) . Paratypes (slides): two females, ALMG GEN 951 A; two females, AM P40973 ; two females, GOS 21292a; two females, NHM 1992.31–32; two females, USNM 251694 About USNM . Paratypes (tubes): five females, ALMG GEN 951 B; five females, AM P40974 ; five females, GOS 21292b; five females, NHM 1992.33– 37; five females, USNM 251694 About USNM .
Type locality
‘‘A marshy channel alongside a small wooden church in Pta. Bandera, Santa Cruz Province, Argentina’’ ( Frey 1993b).
Material examined
Twenty-three parthenogenetic females from ‘‘Arroyo aqua caliente’’, near San Salvador de Jujuy, Departamento de Cochinoca, Jujuy Province, Argentina, collected on 1 November 1901 by E. Nordenskiöld, SMNH Cladocera 24; one parthenogenetic and one ephippial female from ‘‘La Quinta’’ (Laguna La Quinta, 140 km from San Salvador de Jujuy), Jujuy Province, Argentina, collected on 1901 by E. Nordenskiöld, SMNH Cladocera 25.
Short diagnosis
Body ( Figure 50 View Figures 47–55 ) relatively light and transparent, dorsum without a medial keel, posteroventral angle with one to three, rarely four denticles. Rostrum distinctly shorter than labral keel ( Figure 51 View Figures 47–55 ). Head shield with rounded posterior end, anteriorly makes a blunt rostrum, PP53.0–3.6 IP. Striation on head shield and valve ill-defined. Setae at valve ventral margin situated exactly marginally. Setules on posterior margin of valve situated on inner face of valve submarginally. Postabdomen ( Figure 52 View Figures 47–55 ) long, slightly narrowing distally, with rounded and slightly prominent dorso-distal angle, its anal, preanal, and postanal portions roughly equal in length, anal teeth strong, solitary or in series of two to three in distal half of postanal margin, and as series of fine setules in its basal portion. Anntenna I with a welldefined basal peg. On antenna II, one apical seta on each branch shorter than other two setae. On limb I smallest ODL seta short, two largest IDL setae greatly unequal in size. On innerdistal portion of limb II, scrapers 1–3 with size decreasing basally; setules on gnathobase delicate, naked, filter plate II with eight setae. On exopodite III setae 1 and 3 unequal in length, filter plate III with eight setae. Filter plate IV with six setae. Exopodite V with a single projection distally to distal seta 1 (according to Frey 1993b, Figure 164).
Description
See Frey (1993b).
Distribution
Our new findings change ideas on the distributional range of this species in South America, now, in addition to Frey’s (1993b) single locality in the Province of Santa Cruz, it is found in Jujuy Province, in the northern part of the Argentinian Andes.
Frey DG. 1993 b. Species of Pleuroxus (Anomopoda, Chydoridae) from the subantarctic islands and southernmost South America: a partial unraveling of the Pleuroxus aduncus problem. Hydrobiologia 262: 145 - 188.
Smirnov NN. 1996. The Chydorinae and Sayciinae (Chydoridae) of the world. Amsterdam: SPB Academic Publishing. 197 p. (Guides to the identification of the microinvertebrates of the continental waters of the world; 11).
Figures 47–55. Different species of Pleuroxus from the southern hemisphere. (47, 48) Pleuroxus carolinae from small rockpools near Fika Patso, Republic of South Africa, postabdominal claws. (49) Pleuroxus scopuliferus from unknown water body near Morro Chico, southern Chile, lectotype. (50–52) Pleuroxus varidentatus, ephippial female from La Quinta, Argentina. (53–55) Pleuroxus hardingi sp. nov. from pools near the city of Cochabamba, Bolivia, general view, postabdomen and postero-ventral portion of valve. Scale bars: 0.01 mm (47, 48, 55); 0.1 mm (49–54).
AM |
Australian Museum |
SMNH |
Department of Paleozoology, Swedish Museum of Natural History |
V |
Royal British Columbia Museum - Herbarium |
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Pleuroxus varidentatus Frey, 1993
Smirnov, Nikolai N., Kotov, Alexey A. & Coronel, Jorge S. 2006 |
Pleuroxus varidentatus
Smirnov NN 1996: 46 |
Frey DG 1993: 177 |