Vestalenula, IRAJAI

Pinto, R. L., Rocha, C. E. F. & Martens, K., 2003, On two new species of the genus Vestalenula Rossetti & Martens, 1998 (Crustacea, Ostracoda, Darwinulidae) from semiterrestrial habitats in São Paulo State (Brazil), Zoological Journal of the Linnean Society 139, pp. 305-313: 309-312

publication ID

http://doi.org/ 10.1046/j.1096-3642.2003.00070.x

DOI

http://doi.org/10.5281/zenodo.5110448

persistent identifier

http://treatment.plazi.org/id/0399879D-684F-484B-316E-8494FD5DFDC1

treatment provided by

Carolina

scientific name

Vestalenula
status

SP. NOV.

VESTALENULA IRAJAI   SP. NOV.

( FIGS 2A–D View Figure 2 , 3A–H View Figure 3 )

Type locality

Tamoios Road, near Paraibuna, São Paulo State, Brazil. Approximate GPS coordinates: 23∞31¢9.6≤S, 45∞32¢21≤ W. In small patches of water and amongst leaves and mosses on a concrete surface; water film flowing from rocky wall of this artificial habitat. All material collected on 19.11.1999 by CEFR and JWR   .

Type material

Holotype: an ovigerous, dissected female, with valves stored dry in a micropalaeontological slide and dissected soft parts kept in a sealed slide ( MZUSP 15049 View Materials ).  

Paratypes: 2 ovigerous females dissected and stored like the holotype ( MZUSP 15050 View Materials , MZUSP 15051 View Materials )   ; 1 ovigerous, dissected female, with valves used for SEM and stored in a micropalaeontological slide and dissected soft parts kept in a sealed slide ( MZUSP 15052 View Materials )   ; 3 carapaces used for SEM and stored in micropalaeontological slides ( MZUSP 15053 View Materials , MZUSP 15054 View Materials , MZUSP 15055 View Materials )   ; 12 females kept in toto in ETOH ( MZUSP 15056 View Materials )   .

Other material used for description and illustration

1 Sítio da Colonia , Mulungu, near Araçoiaba da Serra, São Paulo State, Brazil. Approximate GPS (Garmin) coordinates: 23∞32¢2≤S, 47∞39¢ 41.1≤W (= type locality of V. botocuda   sp.nov.): One ovigerous female collected on 15.08.2001 by CEFR and RLP from moist mud   .

2 Fazenda Iterei, Miracatu, São Paulo State, Brazil. Approximate GPS (Garmin) coordinates: 24∞3¢17.8≤S, 47∞13¢7.6≤ W. Two ovigerous females collected on 13.9.1999 CEFR and JWR from water and soil of bromeliad pouches   .

Derivation of name

Named after Prof. Dr Irajá Damiani Pinto (Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil), in recognition of his outstanding contribution to the knowledge of South American Ostracoda  in general, and Darwinulidae   in particular.

Abbreviated diagnosis

Valves elongated (L/H = 2.3), with straight parts of dorsal and ventral margins parallel; ms relatively large; keel on RV short and rounded and rather anteriorly placed; third segment of A1 with ventroapical seta; first endopodal segment of A2 with 2 apical setae and Md-palp with seta x almost twice as long as seta w.

Description

Carapace ( Fig. 3A- H View Figure 3 ) elongated, in lateral view with straight parts of dorsal (c. 40% of total length) and ventral (c. 55%) margins parallel. LV overlapping RV along anterior, ventral and posterior margins; anterior overlap clear. Both valves asymmetrical in dorsal and ventral views, widest in the posterior quarter of the carapace, posterior side with LV bulging over RV, anterior bluntly beak-like, central part with a weak constriction. Ventral margin in ventral view strongly sinuous; keel short and rounded.

LV in lateral (internal) view with caudal margin evenly rounded, anterior margin asymmetrically produced towards the ventral side; anterior internal tooth short and small, situated c. 1/5 of total length from the anterior margin; ms large, situated nearer the anterior side and consisting of 8 scars arranged in a neat rosette, 3 anterior and 3 posterior, 1 dorsal and 1 ventral scar; mandibular scar rounded.

RV in lateral (internal) view with caudal margin asymmetrically twisted (not visible on illustrations), ventrally everted towards the median rather than the dorsal side, anterior margin everted towards the ventral side; postero-ventral keel short and rounded, situated rather anteriorly, ms large, situated nearer the anterior side, consisting of 7 scars arranged in a rosette (dorsal scar missing).

A1 ( Fig. 2A View Figure 2 ) with 1 dorsal seta on first segment and 2 ventral setae on second segment, third segment with a dorsal and a ventral seta.

A2 ( Fig. 2B View Figure 2 ) exopodite with one long seta and one short spine; first endopodal segment of A2 with 1 large and one shorter apical seta.

Md-palp ( Fig. 2C View Figure 2 ) with seta z long, reaching beyond tip of apical segment; seta y short; seta x about twice as long as seta w; apical segment with 3 long claws, one shorter and one very short near seta c.

Caudal rami consisting of a slender base and an apical seta, both about equally long. Postabdomen elongated, lobed and twisted, without seta ( Fig. 2D View Figure 2 ).

Other appendages typical of the genus.

Measurements

L = 450–465 Mm; H = 195–200 Mm (n = 3)

Ecology and distribution

The species has been found in small patches of water and amongst leaves and mosses from a permanently wet grassy exposed area in its type locality. The species was relatively more abundant (about 40 individuals) in a film of water running over a rocky outcrop. Isolated specimens were also found from the same habitat as the preceding species (moist mud patches), as well as from mud and water from bromeliad pouches.

Differential diagnosis

Vestalenula irajai   sp. nov. is most closely related to V. pagliolii   , the soft part morphology of both species being nearly identical. The valves of V. irajai   , however, are significantly more elongated with nearly straight dorsal and ventral margins which furthermore run parallel to each other. Anterior overlap in V. irajai   is clear but less pronounced than in V. botocuda   .