Caledromus robinsmithi gen. et, 2023
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publication ID |
https://dx.doi.org/10.3897/zookeys.1165.104045 |
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publication LSID |
lsid:zoobank.org:pub:206B7B3B-3CD4-4D64-9F6E-C1556C6FC7BF |
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persistent identifier |
https://treatment.plazi.org/id/4C16B7A5-2500-4831-ABD7-BC31AD44B0D2 |
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taxon LSID |
lsid:zoobank.org:act:4C16B7A5-2500-4831-ABD7-BC31AD44B0D2 |
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treatment provided by |
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scientific name |
Caledromus robinsmithi gen. et |
| status |
sp. nov. |
Caledromus robinsmithi gen. et sp. nov.
Figs 1 View Figure 1 , 2 View Figure 2 , 3 View Figure 3 , 4 View Figure 4 , 5 View Figure 5
Type locality.
New Caledonia • North Province, Village of Poindimié in the area of the valley of the Necaapwé (sample HYNC2569). Coordinates: 20°57.165'S, 165°21.71'E. Altitude: 35 m. Collected on 28.05.2018. Road-side pool. Leg.: JH and KM. Holotype, allotype and paratypes all from the type locality (Fig. 1 View Figure 1 , Suppl. material 1).
Type material.
Holotype • 1 ♂ (adult); dissected and stored on a permanent microscopic slide and valves stored dry in a micropalaeontological slide (MNHN-IU-2023-181).
Allotype • 1 ♀ (adult); dissected and stored as the holotype (MNHN-IU-2023-182).
Paratypes • 3 adult ♂♂ Cp (RBIN-INV-197990, MNHN-IU-2023-184, MNHN-IU-2023-185) and 3 adult ♀♀ Cp (RBIN-INV-197992, MNHN-IU-2023-187, MNHN-IU-2023-188) used for SEM. 1 adult ♂ (MNHN-IU-2023-183) and 2 adult ♀♀ (MNHN-IU-2023-186, RBIN-INV-197991) dissected and stored as the holotype. Several adult and juvenile ♂♂ and ♀♀ stored in toto in EtOH (MNHN-IU-2023-189).
Repositories.
Muséum national d’Histoire naturelle, Paris, France (MNHN-IU-2023-181-189) and Royal Belgian Institute of Natural Sciences, Brussels, Belgium (RBINS-INV. 197989-197992).
Etymology.
the species is named after Dr Robin Smith (Kusatsu, Shiga, Japan), in recognition of his significant contribution to research on non-marine ostracods, especially on those of the ancient Lake Biwa, and with much appreciation of years of friendship with KM.
Diagnosis.
Cp robust and rather wide in dorsal view. LV overlapping RV on all sides, but especially along posterio-dorsal and entire anterior side. Valve surface not striated, but set with random grooves, small pits, and rimmed pores around stiff setae. RV with inner list, LV with posterior marginal selvage. A1 with Rome-organ small, consisting of one segment. A2 with five natatory setae fully absent, only accompanying seta present; male with claw GM with hyper-developed row of spines. Md-palp with alpha and beta setae both short and elongated. Mx1-palp with second segment cylindrical (rectangular in the dissection), with L ~ 1.5 × basal width. T1 in female with large, inflated, and asymmetrical palp, distally with three short setae; setae b, d and a present, seta d longer in the male than in the female. Prehensile palps in male both with sickle-shaped second segment, in Rpp longer than in Lpp. T2 with seta d1 ~ 2 × as long as d2. T3 with a distal pincer-shaped organ. CR without sexual dimorphism, with robust ramus, seta Sp an unmoveable claw, seta Sa longer than claw Ga, the latter almost straight, claw Gp distally curved. Attachment of CR with proximal triangular re-enforcement, branch vb almost straight, branch db curved backwards. Hp with asymmetrically rounded ms without hook-like expansion; ds consisting of two parts, ds1 rectangular and distally situated, ds2 rounded and situated mid-dorsally; internal anatomy without additional coils of the postlabyrinthal spermiduct. Zenker organ elongated, with ~ 20 coils.
Description.
Male. Cp in lateral view (Fig. 2D View Figure 2 ) elongated, with anterior margin more broadly rounded than the posterior one; greatest height situated anterior to the middle; LV overlapping RV along all sides, but specifically along the antero-dorsal and the anterior side and with a weakly rounded ventral flap. CpD (Fig. 2F View Figure 2 ) with W ~ 1/2 of the L, greatest width situated in the posterior ¼; posterior edge more broadly rounded than anterior one. CpV (Fig. 2G View Figure 2 ) showing both valves with straight ventral outer lists. Valve surface not striated, but set with random grooves, small pits, and rimmed pores around stiff setae (Fig. 2E View Figure 2 ).
LVi (Fig. 2A, B View Figure 2 ) with anterior margin more broadly rounded than posterior one, greatest height at ~ 1/3 from the anterior side, dorsal margin from that point onwards sloping towards the less broadly rounded posterior margin, ventral margin weakly curved; anterior calcified inner lamella broad, posterior one very narrow; inner list running briefly along the anterior margin, robustly along the ventral margin forming a groove and showing antero-ventral and postero-ventral shallow pegs (Figs 2B View Figure 2 , 4G-I View Figure 4 ).
RV (Fig. 2C View Figure 2 ) with shape similar that that of LV, but with anterior margin more produced and with submarginal selvage running along most of the anterior, ventral, and posterior margins.
A1 (Fig. 5A, B View Figure 5 ) with seven segments. First segment with two long ventro-apical setae, and one short mid-dorsal seta; Wouters’ organ not seen. Second segment sub-quadrate, distally narrowing, with one sub-apical seta; Rome organ small, consisting of one rounded segment (Fig. 5B View Figure 5 ). Third segment rectangular, slightly> 2 × as long as basal width, with one short dorsal seta. Fourth segment almost as long as wide, with two long dorsal setae and two unequal, much shorter ventral setae. Fifth segment slightly longer than wide, with two long ventral and one long dorsal natatory setae. Sixth segment slightly longer than wide, with four long and one short natatory setae. Terminal (7th) segment ~ 2 × as long as wide, with single shorter seta, one aesthetasc Ya of sub-equal length, and two long natatory setae.
A2 (Fig. 5C, D View Figure 5 ) with exopodite reduced to a small plate, bearing one long and two short setae. Endopodite 3-segmented. First segment elongated and stout, aesthetasc Y long and slender (~ 1/3 of length of segment); five natatory setae fully absent, accompanying (6th) seta just reaching halfway of second endopodal segment. Second endopodal segment with two dorso-lateral and four ventro-lateral (t-) setae; of the latter, seta t2 ~ 2 × as long as the other three setae; distal chaetotaxy typical of male Cyprididae , with clear sexual dimorphism, consisting of four claws (z1 and z2 being the largest, G2 being slightly shorter, G1 very short), and two setae (z3 and G3). Terminal (3rd) endopodal segment (Fig. 5D View Figure 5 ) with large claw Gm bearing a row of ~ 20 hyper-developed spines, a shorter but stout claw GM, a short seta g and long aesthetasc basally fused with a long, but slightly shorter seta.
Md with coxal plate (Fig. 6C View Figure 6 ) elongated, distally set with rows of spines and small setae. Md-palp (Fig. 7A-C View Figure 7 ) with alpha-seta rather long, slender, and smooth; beta-seta shorter, ~ ¾ the length of the alpha seta, sender and hirsute; gamma-seta large, broad and hirsute in distal 2/3 of its length. First segment with two long barbed setae s1 and s2), one long smooth seta and the alpha seta. Second segment dorsally with a group of three smooth setae (two long, one shorter), ventrally with four long and hirsute and one shorter hirsute setae as well as the beta seta. Third segment dorsally with four subapical and subequal setae, ventrally with one subapical seta and a short aesthetasc, medially with four setae (three plus gamma-seta). Terminal segment (Fig. 7B View Figure 7 ) with three slender claws and three long setae.
Rake-like organ (Fig. 8D View Figure 8 ) of normal shape, with ~ 8 unequal teeth.
Mx1 (Fig. 7D, E View Figure 7 ) with second palp-segment cylindrical (rectangular in slide), L ~ 1.5 × W; two Zahnborsten on third endite, one more robust, one more slender, both smooth. Sideways directed bristles unequal: one 2 × as long as the second, the latter short and more slender, both hirsute. Respiratory plate (Fig. 7E View Figure 7 ) large and elongate, distally with a row of ~ 14 hirsute rays of distally increasing length, apically with one short smooth seta; proximally with a bundle of four smooth setae of medium length.
T1 (Figs 8A-C View Figure 8 , 11C, D View Figure 11 ) with distal chaetotaxy of coxal plate consisting of ten setae of different shape and length and a group of four subapical setae, one longer, two of medium length and one shorter; proximally with two short a-seta; setae d and b showing left/right asymmetry: in T1 on one side both setae d and b relatively short, with b still longer than d, the latter only ~ 2 × the length of the a-setae (Fig. 8B View Figure 8 ); in the other T1 (Fig. 8C View Figure 8 ) setae b and d almost 2 × as long, b still longer than d (in the specimen illustrated here, both setae b and d appear to end in a flagellum, but this is not so in all specimens). Prehensile palps (Fig. 11C, D View Figure 11 ) slightly asymmetrical; first segments of sub-triangular shapes, with a large ventral protuberance, set with two large subequal sensory organs; second segments sickle shaped, in Rpp (Fig. 11C View Figure 11 ) narrower and more elongated than in Lpp (Fig. 11D View Figure 11 ), distally with one long and stout sensory organ.
T2 (Fig. 10D View Figure 10 ) with elongated segments and relatively long end claw. First segment with seta d1 long, reaching beyond second (knee) segment,> 2 × as long as seta d2. Third segment with a long ventro-apical e-seta, almost reaching tip of fourth segment. Fourth segment divided into two elongated sub-segments: segment 4a with a ventro-apical seta f, not reaching tip of segment 4b, this segment with a ventro-apical seta g. Fifth segment with an apical seta h1, a subapical seta h3, and a long and thin apical claw h2.
T3 (Fig. 10A, B View Figure 10 ) a cleaning limb. First segment with three long setae, ventrally with setae d1 and d2, dorsally with seta dp. Second segment very elongated, with L ~ 5 × basal W, with a long subapical seta e. Third segment with a shorter lateral seta f, apical seta g missing. Distal part of 3rd segment and 4th segment fused to a pincer shaped organ, bearing one long seta h3, one broadly and a curved hirsute seta h2 of medium length. Pincer organ (Fig. 10B View Figure 10 ) with spine, minute seta h1 and flanked by rows of setulae.
CR (Fig. 10E-G View Figure 10 ) symmetrical, with slightly curved, robust ramus, ventrally set with a row of setulae; seta Sp transformed in a stout, unmoveable spine (Fig. 10F View Figure 10 ); claw Gp robust and distally curved, claw Ga robust and straight, seta Sa a real seta, significantly longer than claw Ga.
Att (Fig. 10C View Figure 10 ) with simple distal bifurcation and solid triangular structure at basis (the latter typical of all Herpetocypridinae ).
Hp (Fig. 11A View Figure 11 ) well-sclerified, consisting of an asymmetrically rounded ms without hook-like expansion; ds consisting of two lobes, ds1 rectangular and distally situated, ds2 rounded and situated mid-dorsally; internal anatomy without additional coils of the postlabyrinthal spermiduct (see above); three ventral coils leading to bursa copulatrix well developed.
Zenker organ (Fig. 11B View Figure 11 ) elongated, with ~ 20 coils.
Female (only sexual dimorphism with males given). Cp (Fig. 3D-G View Figure 3 ), RV (Figs 3C View Figure 3 , 4D-F View Figure 4 ), LV (Figs 3A, B View Figure 3 , 4A-C View Figure 4 ), A1, Md, Mx1, T2, T3, CR and CR-attachment as in the male.
A2 (Fig. 6A, B View Figure 6 ) with distal chaetotaxy of second endopodal segment consisting of three G-claws and three z-setae; claws G1 and G3 the longest and subequal, setae z1 and z2 the longest and subequal, seta z3 the shortest. Terminal (3rd) endopodal segment with claw GM long and stout, but without the hyper-developed spines.
T1 (Fig. 9A-C View Figure 9 ) with distal chaetotaxy of coxal plate consisting of ten setae of different shapes and lengths, and a group of four subapical setae, one proximal seta significantly longer, two of medium length and one shorter; proximally with two short a-seta; setae d and b showing left/right asymmetry: T1 on the one side with seta d much longer and seta b relatively short, ~ 2-2.5 × length of setae a (Fig. 9B View Figure 9 ); in the other T1 (Fig. 9C View Figure 9 ) seta d shorter and set b much longer. Palp wide and large, distally slightly skewed to one side, set with three very short and slightly unequal setae (Fig. 9A View Figure 9 ).
Female copulatory organs (not illustrated) as typical of the subfamily, i.e., rounded, slightly elongated structures with few visible internal or external features.
Measurements.
See Table 2 View Table 2 .
Ecology.
The species is presently known from its type locality only: a shallow roadside pool, with water coming from a small stream; with terrestrial plants, grasses and “Songe” on sediment consisting of gravel and mud (Suppl. material 1). Depth: 0.05-0.1 m. Water temperature: 21 °C. Electrical conductivity: 103 µS /cm. pH: 6.64.
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