Bennelongia lata, Martens & Schön, 2012

Martens, Koen, Halse, Stuart & Schön, Isa, 2012, Nine new species of Bennelongia De Deckker & McKenzie, 1981 (Crustacea, Ostracoda) from Western Australia, with the description of a new subfamily, European Journal of Taxonomy 8, pp. 1-56 : 32-33

publication ID	https://doi.org/ 10.5852/ejt.2012.8
publication LSID	lsid:zoobank.org:pub:A8804F82-A49A-481E-BB04-2CB4D004EB01
DOI	https://doi.org/10.5281/zenodo.3858808
persistent identifier	https://treatment.plazi.org/id/71A83E42-8C1B-45FF-9769-3E5356A91749
taxon LSID	lsid:zoobank.org:act:71A83E42-8C1B-45FF-9769-3E5356A91749
treatment provided by	Carolina
scientific name	Bennelongia lata
status	sp. nov.

Treatment

Bennelongia lata View in CoL sp. nov.

( Figs 16 View Fig , 17 View Fig A-C)

Etymology

The species has a broad lapel on the RV. Broad = lata in Latin.

Diagnosis

Cp with pronounced anterior rostrum, posteriorly bluntly pointed. LV with relatively weak anteroventral beak and perfectly rounded dorsal margin. Lapel on RV broad, running parallel to selvage. Hemipenis with ms with straight margin, ventrally widely produced as a broad lobe; ls in both hemipenes boot shaped, distally with blunt tip; tips of ls and ms close together, ls slightly longer than ms. Rpp with distal segment triangular, broad. Lpp with proximal segment without apical outgrowth; distal segment sickleshaped, elongated, as long as first segment, and with almost parallel margins, except for distal part.

Measurements (all measurements in µm)

Male: RV: L = 1660-1700; H = 930-962. LV: L = 1770-1810; H = 995-1030. Cp: L = 1670-1800; H = 881-995.

Female: Cp: L = 2000-2040; H = 1130; W = 1120-1170.

Type locality

Yandoo Billabong, Boolathana Station, Gascoyne, WA (sample SIEK3); approximate coordinates 24º 38’ 25”S 113º 55’ 20”E. All material was collected on 7 Apr. 2006 by the authors.

Type material

Holotype

Male ( WAM.C49399 ), with soft parts dissected in a sealed slide, valves stored dry in a micropalaeontological slide.

Allotype

LV and RV of a female ( WAM.C49400) stored dry in a micropalaeontological slide.

Paratypes

Two males dissected and stored as the holotype ( WAM.C49401, OC.3318); two males and one female ( WAM.C49402A-C) carapaces in a micropalaeontological slide.

Several juvenile specimens: one cp of a male (A-1) ( WAM.C49403); 2 Cp and 1 LV female (A-1) and 1 Cp female (A-3) ( WAM.C49404A-D).

Several specimens in EtOH ( WAM.C49405).

Other material investigated

Tirigie Claypan, Boolathana Station, Gascoyne, WA (sample SIEK 4), approximate coordinates: 24º 38’ 29”S 113º 59’ 44”E. All material was collected on 7 Apr. 2006 by the authors.

Differential diagnosis

The species belongs to the B. australis group because of the generally large size (L> 1500 µm), the presence of a lapel on the RV and of a strong anterior rostrum in dorsal view. It can be distinguished from the other species in this lineage by the very rounded dorsal margin of both valves, the elongated lapel running parallel to the selvage, the very broad second segment of the Rpp, the fact that tips of ls and ms of the hemipenes are hardly separated from each other and that the ls is slightly longer than the ms.

Additional description

Valves in lateral view ( Figure 16 View Fig A-D) with rounded dorsal margin, LV overlapping RV on all sides ( Figure 16K View Fig ), greatest height in the middle; in dorsal and ventral views ( Figure 16 View Fig E-H) with greatest width in the middle of the carapace; anterior rostrum well-developed, posterior side bluntly pointed, LV dorsally less ridge-like than in the other species of this lineage; external surface weakly pitted and sparsely set with short setae.

LV ( Figure 16A, C View Fig ) in inner view with rounded dorsal margin, greatest height situated in the middle; antero-ventral beak-like expansion moderate; ventral margin almost straight over most of its length.

RV ( Figure 16B, D View Fig ) in inner view with greatest height situated slightly in front of the middle, dorsal margin rounded; posterior selvage submarginal, posterior inner list merging with posterior selvage; remnant of valve margin visible between lapel and valve margin; antero-ventral inner list running to about halfway the lapel; selvage at height of lapel expanded, not striate, lapel ( Figure 16I, J View Fig ) broad and long, see specific name.

Most appendages as typical of the genus and without special features.

Rpp ( Figure 17C View Fig ) with first segment c. 1.5 times as long as wide, subapically with one long but slender, and one short sensory organ; second palp segment triangular, broad, with straight distal margin; apically with one small sensory organ.

Lpp ( Figure 17A View Fig ) with first segment elongated, more than twice as long as central width, subapically with one long, but slender sensory organ, slightly striate in the middle; apically without distinct outgrowth, but with one small sensory organ; second palp segment nearly straight, sickle-shaped and relatively elongated (L = c. L of first segment); distal part of this segment straight and with nearly parallel margins.

Hemipenes ( Figure 17B View Fig ) asymmetrical, with tips of ls and ms situated closely together, ls slightly longer than ms, distal part of ms produced into a blunt lobe; distal part of ls boot-shaped, bluntly pointed with distal margin rounded in one hemipenis, with thumb-like expansion in the other.

Ecology and distribution

The species is known from two semi-permanent turbid, freshwater billabongs in the Gascoyne area, namely the type locality Yandoo Billabong and Tirigie Claypan (see above). No further environmental data are available.