Nine new species of Bennelongia De Deckker & McKenzie, 1981 (Crustacea, Ostracoda) from Western Australia, with the description of a new subfamily Author Martens, Koen Royal Belgian Institute of Natural Sciences, Freshwater Biology, Vautierstraat 29, B- 1000 Brussels, Belgium (corresponding author) E-mail: koen. martens @ naturalsciences. be & University of Ghent, Department of Biology, K. L. Ledeganckstraat 35, B- 9000 Gent, Belgium Author Halse, Stuart Bennelongia Environmental Consultants, 5 Bishop Street, Jolimont WA 6014, Australia Author Schön, Isa Royal Belgian Institute of Natural Sciences, Freshwater Biology, Vautierstraat 29, B- 1000 Brussels, Belgium (corresponding author) E-mail: koen. martens @ naturalsciences. be & University of Hasselt, Research Group Zoology, Agoralaan Building D, B- 3590 Diepenbeek, Belgium text European Journal of Taxonomy 2012 2012-03-07 8 1 56 journal article 21831 10.5852/ejt.2012.8 6cfac628-b07b-421d-9102-f47c8306fd58 2118-9773 3857965 A8804F82-A49A-481E-BB04-2CB4D004EB01 Bennelongia lata sp. nov. ( Figs 16 , 17 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 A-D) with rounded dorsal margin, LV overlapping RV on all sides ( Figure 16K ), greatest height in the middle; in dorsal and ventral views ( Figure 16 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 ) 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 ) 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 ) broad and long, see specific name. Most appendages as typical of the genus and without special features. Rpp ( Figure 17C ) 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 ) 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 ) 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.