Branchinella compacta, Linder, 1941, Linder, 1941

Timms, Brian V, 2012, Further studies on the fairy shrimp genus Branchinella (Crustacea: Anostraca: Thamnocephalidae) in Australia, with descriptions of five new species, Zootaxa 3595, pp. 35-60: 41

publication ID

http://doi.org/ 10.5281/zenodo.254592

publication LSID

lsid:zoobank.org:pub:B628934A-BF37-41A2-8E77-EC19A3A1F5AC

DOI

http://doi.org/10.5281/zenodo.5685425

persistent identifier

http://treatment.plazi.org/id/03909832-FFE3-001C-6CC0-FCA8D0ADFF17

treatment provided by

Plazi

scientific name

Branchinella compacta
status

 

B. compacta Linder, 1941  

Figs. 1 View FIGURE 1 D, 4, 5A

Branchinella compacta Linder, 1941   , pp. 245 – 7, fig. 31; Geddes, 1981, pp. 261–262, fig. 4; Timms, 2008, pp. 291–292, Fig. 2 View FIGURE 2

Material. Victoria, Lake Ondit, 38 o 14 ’S, 143 o 35 ’E, 14 October 1971, M.C. Geddes, AM P19235 View Materials , 3males, 9 females; New South Wales, Monaro Tablelands, 43 km S of Cooma, Avon Lake, 36 o 37 ’ 06”S, 149 o 02’ 50 ”E, 10 December, 1989, BVT, AM P74344 View Materials , 6 males, 4 females; same locality, 14 March 2010, BVT, AM P88372 View Materials , 4 males, 12 females; New South Wales, Monaro Tablelands, 23 km SW of Cooma, Salt Lake, 36 o 21 ’ 52 ”S, 148 o 57 ’ 11 ”E, 14 March 2010, BVT, AM P88373 View Materials , 2 males, 1 female.

Remarks. Branchinella compacta   occurs in southern Victoria, and now in southeast New South Wales, but not in southwestern Western Australia as the later specimens are described below as a new species. The following can be added to the description by Linder (1941) and Geddes (1981). While both authors note the absence of a frontal appendage in Victorian material, that from the Monaro, NSW, has a very small forked appendage. The medial surface of the basal antennomere bears minute spinules in some specimens which probably have a sensory function. There is also a very minor tumidity somewhere along this medial surface, apically ( Fig 4 View FIGURE 4 of Geddes, 1981), but about midway in Lake Ondit and Lake Avon specimens studied.

The male fifth thoracopod is similar to that reported by Linder (1941) and Geddes (1981), but there are some important features of the anterior setae that need documenting. Endite 1 anterior seta is the longest of all 10 setae and is smooth. Endite 2 main anterior seta is half the length of anterior seta 1, has a pecten of spinules and is attended basally by a very short spiniform seta. Endite 3 ’s two anterior setae are like those of endite 2, but about 50 % longer. Endites 4 and 5 have two anterior setae each, a longer one subequal in length to the main anterior seta of endite 2, with a pectin of spinules and a basal array of spinules. The shorter seta is about a quarter the length of the longer seta and naked. Endite 6 has just one anterior seta which is similar to the longer one of endites 4 and 5. The structure of these last five setae is unique to this species and serves to differentiate it from its sibling species described below.

Unlike most other species of Branchinella   , B. compacta   has outgrowths/tumidities on the genital segments. Linder (1941) noted a pair of stout spine-like outgrowths dorsally and two tumidities on the first genital segment, which Geddes (1891) reported also. The present specimens from Lake Ondit have a similar pair of spines but just one lateral tumidity and the Avon Lake specimens have a much larger pair of dorsal outgrowths directed posteriorly and terminating in a spine, but no apparent tumidities. It would seem then there is some variability in the expression of these outgrowths; this is accepted as normal for tumidites, given their variation, often associated with preservation, in Parartemia ( Timms, 2012)   . In all mature specimens examined there is a bulbous tumidity ventrally on the brood chamber and in the Avon Lake specimens this has a posteriorly directed hook.

NSW

Royal Botanic Gardens, National Herbarium of New South Wales

Kingdom

Animalia

Phylum

Arthropoda

Class

Branchiopoda

Order

Anostraca

Family

Thamnocephalidae

Genus

Branchinella

Loc

Branchinella compacta

Timms, Brian V 2012
2012
Loc

Branchinella compacta

Linder 1941
1941