Bilocypris mandoraensis, Halse & Martens, 2019

Halse, Stuart A. & Martens, Koen, 2019, Four new genera and five new species of ‘ Heterocypris’ from Western Australia (Crustacea, Ostracoda, Cyprinotinae), European Journal of Taxonomy 493, pp. 1-35 : 22-25

publication ID	https://doi.org/ 10.5852/ejt.2019.493
publication LSID	lsid:zoobank.org:pub:1B30A13F-F213-4F8E-B0DF-605660BE9349
DOI	https://doi.org/10.5281/zenodo.5927627
persistent identifier	https://treatment.plazi.org/id/41706371-0D1C-486E-91D5-B287EE5C3375
taxon LSID	lsid:zoobank.org:act:41706371-0D1C-486E-91D5-B287EE5C3375
treatment provided by	PlaziZenodoSync
scientific name	Bilocypris mandoraensis
status	gen. et sp. nov.

Treatment

Bilocypris mandoraensis gen. et sp. nov.

urn:lsid:zoobank.org:act:41706371-0D1C-486E-91D5-B287EE5C3375

Figs 10–11 View Fig. 10 View Fig. 11

Diagnosis

Valves arched, greatest height situated in middle. RV with anterior and posterior marginal selvage. Marginal tubercles present along anterior, postero-ventral and posterior margins. Lpp with elongated first and second segment; first segment with sub-parallel margins; second segment sickle-shaped and with flagellum-like distal part. Rpp with second segment elongated and somewhat skewed. Hp with lobe ls boot-shaped, with ventral part sharply pointed, and with distal margin almost straight; lobe ms very broad, more clearly bilobed than in preceding species; distal part of bc short and pointed.

Etymology

Named after the type locality, Mandora Marsh, Pilbara, Western Australia.

Measurements

See Table 1.

Type locality

Fern Spring, Mandora Marsh, Pilbara, West Australia. Coordinates: 19°45′59.9″ S, 121°23′34.1″ E. Collected by Adrian Pinder, 4 Sep. 2015. Nearby Melaleuca Spring (coordinates: 19°46′10.7″ S, 121°23′21.3″ E) also sampled.

Material examined

Holotype

AUSTRALIA • ♂; Western Australia, Pilbara, Mandora Marsh, Fern Spring ; 19°45′59.9″ S, 121°23′34.1″ E; 4 Sep. 2015; Adrian Pinder leg.; dissected with soft parts stored in glycerine on a sealed slide and valves stored dry in a micropalaeontological slide; WAM 67226. GoogleMaps

Allotype

AUSTRALIA • ♀; Western Australia, Pilbara, Mandora Marsh, Melaleuca Spring ; 19°46′10.7″ S, 121°23′21.3″ E; 4 Sep. 2015; Adrian Pinder leg.; dissected and stored as the holotype; WAM 67601. GoogleMaps

Paratypes

AUSTRALIA • 5 ♀♀; same collection data as for allotype; WAM 67227 , 67602 to 67605 GoogleMaps .

Description

Male

RV ( Fig. 10B, G View Fig. 10 ). Arched, greatest height situated in middle; anterior margin and dorsal margin rounded, posterior margin nearly straight, ventral margin weakly sinuous in middle. With both anterior and posteroventral sub-marginal selvages, anterior and posteroventral margins set with medium-sized

marginal tubercles. Anterior calcified inner lamella relatively wide, posterior lamella narrow; both lamellae without inners lists.

LV ( Fig. 10A View Fig. 10 ). Generally with shape as in RV, slightly larger. Anterior calcified inner lamella slightly wider than in RV, blunt anterior inner list running parallel to most of valve margin, posteriorly with blunt inner list in top part of calcified inner lamella.

CARAPACE. In dorsal and ventral views with a weak anterior rostrum; greatest width situated in middle. In lateral view with anterior LV/RV overlap most prominent.

PREHENSILE PALPS ON T1. Asymmetrical, chaetotaxy of endopodite as typical for family (not shown). Rpp ( Fig. 11B View Fig. 11 ) with second segment elongated and somewhat skewed, without additional protrusion on dorso-proximal corner, distal sensory organ medium long. Lpp ( Fig. 11C View Fig. 11 ) with nearly rectangular first segment (except for skewed proximal margin) and with ventro-distal expansion broad and rounded; second segment sickle-shaped and narrow, with long and thin distal flagellum-like expansion.

ZENKER ORGAN. As typical of family, i.e., ca 3–5 × as long as wide and with numerous spinous whorls.

HEMIPENIS ( Fig. 11A View Fig. 11 ). With ls shaped as a birdhead, ventrally sharply pointed, with distal margin nearly straight; lobe ms very broad, more clearly bilobed than in preceding species; distal part of bc short and pointed.

CAUDAL RAMUS ( Fig. 11E View Fig. 11 ). Curved; its attachment ( Fig. 11F View Fig. 11 ) uniramous.

Female VALVES ( Fig. 10C–D View Fig. 10 ). With shape similar to that of male. Valve margin anatomy as in the male, except for more inwardly displaced posteroventral selvage in LV.

CARAPACE. In dorsal ( Fig. 10E View Fig. 10 ) and ventral ( Fig. 10F View Fig. 10 ) views with slight anterior rostrum; greatest width situated in middle.

A1, Md, Mx1, T2, T3 and attachment of CR as in male.

A2 (not shown). With distal chaetotaxy showing sexual dimorphism as typical of family.

T1 (not shown). With palp not segmented, relatively elongated.

GENITAL LOBES. Large and with rounded distal and distally sloping lateral margins ( Fig. 11G–H View Fig. 11 ).

Differential diagnosis

Bilocypris mandoraensis gen. et sp. nov. is closely related to B. fortescuensis gen. et sp. nov. (see above), but can be distinguished from it by its larger size, the more pronounced bilobed nature of the hemipenis lobe ms, the shape of lobe ls (spatulate in B. fortescuensis gen. et sp. nov., pointed boot-shaped in B. mandoraensis gen. et sp. nov.) and the more elongated and skewed shape of the second segment of the Rpp (robust subtriangular in B. fortescuensis gen. et sp. nov.).

Ecology and distribution

Bilocypris mandoraensis gen. et sp. nov. has been collected from two small, hyposaline, mound springs within Mandora Marsh, which is a very large saline area near the coast of the southern Kimberley region, Western Australia. The marsh is mostly dry, although it has both marine and groundwater influences and occasionally experiences widespread flooding after cyclonic rain ( Storey et al. 2011). Bilocypris mandoraensis gen. et sp. nov. was collected at salinities of 7400 and 6280 mg L-1 TDS in 2015 ( Quinlan et al. 2016). The same sites had salinities of 4700 and 5800 mg L- 1 in 1999.