Our Work

Version of material at end of Winter 2026 term (March 2026).

Data contains the Electroluminescence Experimental Results of Perovskite solar cells for use in development of Prediction Mdoel to predict IV curve parameters from EL Emission Area from EL Imaging

Lettres de Calvin (*Calvin's Letters*), a bilingual critical digital edition (French-Spanish) of John Calvin's French correspondence. The digital edition provides access to the letters in their origin…

Lettres de Calvin (*Calvin's Letters*), a bilingual critical digital edition (French-Spanish) of John Calvin's French correspondence. The digital edition provides access to the letters in their original French, a modern French version, a Spanish translation, annotations, visualisations and transversal indexing. It aims to facilitate research on Calvin's correspondence and its historical context.

This dataset contains anonymised quantitative survey data from 161 Indonesian Generation Z migrants residing in European Union countries. The study examined how comparative evaluations of uncertainty …

This dataset contains anonymised quantitative survey data from 161 Indonesian Generation Z migrants residing in European Union countries. The study examined how comparative evaluations of uncertainty in origin and destination contexts are associated with aspirations to remain in Europe. The dataset includes item-level survey responses and composite indices measuring Geopolitical Awareness, European Security Uncertainty, Media Security Exposure, Social Inclusion, European Opportunity, Comparative Uncertainty, and Core Stay Aspiration. Direct identifiers and potentially identifying contextual information were removed or generalised before deposit. Qualitative interview data are not included because the small number of participants and contextual detail could permit re-identification. The dataset supports the article “Comparative Uncertainty and Stay Aspirations among Indonesian Generation Z Migrants in the European Union.”

Caridina grammosticta Hou, Chen & Guo sp. nov.Figs 1 C, 2, 3Material examined.China - Guangxi Holotype: • 1 ♂, cl 6.1 mm, (CAS 546801001), a stream in QNNR, Wenzhu Town, Zhaoping County,…

Caridina grammosticta Hou, Chen & Guo sp. nov.Figs 1 C, 2, 3Material examined.China - Guangxi Holotype: • 1 ♂, cl 6.1 mm, (CAS 546801001), a stream in QNNR, Wenzhu Town, Zhaoping County, Hezhou City, 24°21'33"N, 110°48'18"E, al. 537 m, stn. 1, coll. ZHENG J. C., 8 Apr. 2025.Paratypes: • 1 ♂, cl 6.0 mm, (CAS 546801002); • 1 ♂, cl 5.7 mm, (CAS 546801003); • 7 ♂♂, cl 4.4–5.9 mm, (CAS 546801004); • 1 ♀, cl 6.1 mm, (CAS 546801005); • 1 ♀, cl 3.8 mm, (CAS 546801006); • 1 ♀ (ov.), cl 5.9 mm, (CAS 546801007), same collection data as holotype. • 1 ♂, cl 5.2 mm, (CAS 546801008); • 3 ♂♂, cl 4.6–5.8 mm, (CAS 546801009); • 3 ♀♀, cl 6.1–7.4 mm, (CAS 546801010), Guduo Village, Zhongliang Township, Jinxiu County, Laibin City, 24°08'51"N, 110°20'14"E, stn. 5, coll. CHEN W. J., 20 Nov. 2018. • 1 ♂, cl 5.5 mm, (CAS 546801011); • 3 ♂♂, cl 5.1–5.7 mm, (CAS 546801012); • 4 ♀♀, cl 4.9–6.0 mm, (CAS 546801013), a stream in Nanbianshan Town, Lingui District, Guilin City, 24°52'14"N, 110°13'20"E, al. 725 m, stn 6, coll. Fan H. F., 15 Mar. 2026.Comparative material examined.Caridina stellata Guo, Chen, Chen, Cai & Guo, 2022. China - Guangxi: • 15 ♂♂, cl 5.0– 6.2 mm, (FU, 2018-11 - 04 - 03); • 29 ♀♀, cl 4.9–6.6 mm, (FU, 2018-11 - 05 - 04), a stream near Liuchacun, Jinxiu Town, Jinxiu Yao Autonomous County, Laibin City, 24°3'59.63"N, 110°17'43.94"E, al. 622 m, coll. CHEN W. J., 5 November 2018. Caridina serrata Stimpson, 1860. China - Guangdong: • 3 ♂♂, cl 3.2–3.8 mm, (FU 5190001), Guishan Island, Zhuhai City, coll. GUO Z. L., 27 Nov. 2023. Caridina sphyrapoda Liang & Zhou, 1993. China - Guangxi: • 1 ♂, cl 5.6 mm, (53712224001), a stream from Pingtianshan, Guigang City, 23°10'26.77"N, 109°28'20.76"E, al. 233 m, coll. ZHANG Y. X., HOU J. J., 5 June, 2024. • 1 ♂, cl 4.5 mm, (CAS 53751225001), a stream from Shili Town, Yulin City, coll. ZHANG Y. X., 5 June, 2024.Description.Body (Fig. 1 C): Slender and sub-cylindrical, males up to 6.1 mm cl, females up to 6.8 mm cl. Sixth abdominal somite 0.38–0.55 (median 0.49, n = 20) times as long as carapace.Rostrum (Fig. 2 A): Rostrum straight, reaching from middle of second segment to end of third segment of antennular peduncle. Rostrum length (rl) 0.37–0.52 of cl (median 0.46, n = 26). Dorsally armed with 14–20 teeth, orbital margin posterior to carapace with 6–10 teeth; ventrally with 1–8 teeth. lateral carina dividing rostrum into two unequal parts, continuing posteriorly to orbital margin.Eyes (Fig. 2 A): Well-developed, on short ocular peduncle, cornea globular.Carapace (Fig. 2 A): Length 3.8–7.4 mm in adult specimens. Smooth, glabrous; antennal spine acute, fused with inferior orbital angle; pterygostomian margin broadly rectangular, slightly produced forward; pterygostomian spine absent.Antennule (Fig. 2 B): Peduncle slightly shorter than scaphocerite; stylocerite long, reaching 1.09–1.38 (median 1.25, n = 10) times as long as basal segment; basal segment shorter than combined length of second and third segments, first segment 1.20–1.56 (median 1.29, n = 3) times as long as second segment, second segment 1.36–1.69 (median 1.42, n = 3) times as long as third segments; all segments with marginal plumose setae.Antenna (Fig. 2 C): Scaphocerite 4.1–4.4 (median 4.25, n = 2) times as long as wide.First maxilliped (Fig. 2 G): Palp of first maxilliped broadly triangular, ending in finger-like projection.Third maxilliped (Fig. 3 B): Basal segment as long as penultimate segment; penultimate segment as long as distal segment.Branchial formula as typical for genus Caridina, with epipods on first four pereiopods.First pereiopod (Fig. 3 C): Chela 2.07–2.34 (median 2.19, n = 7) times as long as high, 1.25–1.46 (median 1.37, n = 7) times as long as carpus; movable finger 2.44–3.01 (median 2.71, n = 6) times as long as wide and 1.07–1.40 (median 1.15, n = 6) times as long as palm, setal brushes well-developed; carpus 1.42–1.61 (median 1.52, n = 6) times as long as wide, slightly excavated distally; merus 1.49–1.61 (median 1.07, n = 7) times as long as carpus.Second pereiopod (Fig. 3 D): Chela 2.41–2.73 (median 2.59, n = 7) times as long as high, 0.79–0.84 (median 0.83, n = 7) times as long as carpus; movable finger 3.27–4.27 (median 4.04, n = 6) times as long as wide, 1.48–1.85 (median 1.66, n = 6) times as long as palm, setal brushes well-developed; carpus 4.19–4.71 (median 4.43, n = 7) times as long as wide, slightly excavated distally; merus 0.93–1.11 (median 1.01, n = 7) times as long as carpus.Third pereiopod (Fig. 3 E): Dactylus 3.04–3.41 (median 3.16, n = 6) times as long as wide, terminating in a prominent claw-like spine surrounded by simple setae, followed by 3–5 spiniform setae; propodus 4.06–5.04 (median 4.74, n = 7) times as long as dactylus, 9.50–11.79 (median 10.45, n = 7) times as long as wide; carpus 0.59–0.69 (median 0.63, n = 7) times as long as propodus; merus 1.72–2.31 (median 1.86, n = 7) times as long as carpus, with 3–5 spiniform setae on the posterior margin.Fourth pereiopod: Proportion and spination similar to third pereiopod.Fifth pereiopod (Fig. 3 F): Dactylus 3.01–3.67 (median 3.42, n = 6) times as long as wide, ending in prominent claw-like spine surrounded by simple setae, followed by a row of 29–40 spiniform setae; propodus 4.33–5.28 (median 4.62, n = 7) times as long as dactylus, 11.26–13.66 (median 12.30, n = 6) times as long as wide; carpus 0.52–0.63 (median 0.54, n = 7) times as long as propodus; merus 1.39–1.54 (median 1.43, n = 6) times as long as carpus, with 3–4 spiniform setae on the posterior margin.Male first pleopod (Fig. 3 G): Endopod curved backwards, 0.44–0.47 (median 0.46, n = 3) times as long as exopod, reniform, 2.73–3.19 (median 2.73, n = 3) times as long as distally wide, tip rounded, outer margin convex, middle of the inner margin distinctly concave, base and end slightly wider. Long pappose setae on outer and distal margins, medium-length setae on inner margin; appendix interna well developed, arising from distal 0.25 of endopod, reaching slightly beyond end of endopod, distally with cincinuli.Male second pleopod (Fig. 3 H): Appendix masculina rod-shaped, slightly thicker centrally, narrower distally, 0.50–0.59 (median 0.51, n = 3) times as long as exopod, distal part with long spiniform setae, basal part with a row of short spiniform setae; appendix interna well developed, 0.52–0.70 (median 0.62, n = 3) length of appendix masculina, distally with cincinuli.Telson (Fig. 3 I): Tapering posterior, with 4–6 pairs of short spiniform setae dorsal and one pair of short spiniform setae dorsolaterally; posterior margin 4 pairs of spiniform setae, lateral pair longer than intermediate pairs. Having a triangular protrusion at centre of distal end.Exopodite of the uropod (Fig. 3 J) bears a series of 14–19 (median 17, n = 19) movable spinules along diaresis.Eggs: Large, size of eye-developed eggs 0.87–0.90 mm × 1.22–1.43 mm (n = 6) in diameter.Remarks.Caridina grammosticta sp. nov., resembles C. mariae Klotz & von Rintelen, 2014 by the tiger-striped pattern of body, long stylocerite (cf Klotz and von Rintelen 2014). However, it can be separated from C. mariae by the shape and proportions of the endopod of male first pleopod (reniform, 0.44–0.47 times as long as exopod, tip rounded, outer margin convex, middle of the inner margin distinctly concave vs. subrectangular, 0.58–0.75 times as long as exopod, inner margin slightly concave, distal part dilated in C. mariae); the shape of appendix masculina and shorter appendix interna of the male second pleopod (appendix masculina rod-shaped, with fewer spiniform setae, appendix interna 0.52–0.70 times as long as appendix masculina vs. appendix masculina club-shaped, with more spiniform setae, appendix interna 0.79–0.87 times as long as appendix masculina in C. mariae); the slender scaphocerite (4.1–4.4 times as long as wide vs. 2.8–3.1 times in C. mariae); the broad palp of the first maxilliped with no finger-like tip (vs. with a finger-like tip in C. mariae); and the larger-sized egg (0.87–0.90 mm × 1.22–1.43 mm vs. 0.70–0.74 × 1.13–1.27 mm in C. mariae).Caridina grammosticta sp. nov., resembles C. stellata Guo et al., 2022 in the similar shape of the rostrum, the long stylocerite and the similar morphology of endopod of male first pleopod and the appendix masculina of male second pleopod (cf Guo et al. 2022). However, it can be separated from C. stellata by the wider endopod of male first pleopod (2.73–3.19 times as long as wide vs. 3.70–3.90 times in C. stellata); the fewer spiniform setae of appendix masculina of the male second pleopod (vs. inner margin bearing and tip bearing nearly equally long and stout spiniform setae in C. stellata); the slender carpus of first pereiopod (1.42–1.61 times as long as wide vs. 1.20–1.40 times in C. stellata) and slender chela of second pereiopod (2.41–2.73 times as long as wide vs. 2.10–2.40 times in C. stellata).Caridina grammosticta sp. nov., resembles C. cantonensis Yu, 1936 by the long stylocerite and shape and indentation of the rostrum (cf Liang 2004). However, it can be separated from C. cantonensis by shape of endopod of male first pleopod (reniform, tip rounded, outer margin convex, middle of the inner margin distinctly concave vs. subrectangular, inner margin slightly concave, distal part dilated in C. cantonensis); the shape of appendix masculina of male second pleopod (appendix masculina rod-shaped, with fewer spiniform setae vs. appendix masculina club-shaped, with more spiniform setae in C. cantonensis); the slender scaphocerite (4.1–4.4 times as long as wide vs. 3.5 times in C. cantonensis); broad palp of the first maxilliped with no finger-like tip (vs. with a finger-like tip in C. cantonensis); and relatively larger eggs (0.87–0.90 mm × 1.22–1.43 mm vs. 0.63–0.72 × 0.99–1.09 mm in C. cantonensis). In addition, its distinctive colouration and patterns easily separate the two species when observed in the field.Caridina grammosticta sp. nov., resembles C. sphyrapoda Liang & Zhou, 1993 by the long stylocerite and a reniform, backward-curved endopod of male first pleopod (cf Cai and Ng 1999). However, it can be separated from C. sphyrapoda by the longer and slender endopod of male first pleopod (0.44–0.47 times as long as exopod, and 2.73–3.19 times as long as wide vs. 0.40 times as long as exopod, and 2.00 times as long as wide in C. sphyrapoda); the longer appendix interna (0.52–0.70 times as long as appendix masculina vs. 0.30 times in C. sphyrapoda); the slender scaphocerite (4.1–4.4 times as long as wide vs. 3.0 times in C. sphyrapoda); the wider carpus of first and second pereiopods (1.42–1.61 and 4.19–4.71 times as long as wide vs. 1.80 and 5.00 times in C. sphyrapoda); the wider chela of second pereiopod (2.41–2.73 times as long as wide vs. 3.50 times in C. sphyrapoda); fewer spiniform setae on the dactylus of fifth pereiopod (29–40 vs. 51–65 in C. sphyrapoda). In addition, its distinctive colouration and patterns easily separate the two species when observed in the field.Caridina grammosticta sp. nov., resembles C. nguyeni Li & Liang, 2002 by the long stylocerite and shape and indentation of the rostrum (cf Li and Liang 2002). However, it can be separated from C. nguyeni by shape of endopod of male first pleopod (reniform, tip rounded, outer margin convex, middle of the inner margin distinctly concave vs. reniform, outer margin relatively straight and slightly convex, middle of the inner margin relatively straight and slightly concave in C. nguyeni); longer appendix interna of male second pleopod (0.50–0.59 times as long as appendix masculina vs. 0.33 times in C. nguyeni); fewer spiniform setae on appendix masculina of male second pleopod (with very dense spiniform setae in C. nguyeni); longer movable finger of first pereiopod (1.07–1.40 times as long as palm vs. 0.63–0.68 times in C. nguyeni); the slender scaphocerite (4.1–4.4 times as long as wide vs. 3.0 times in C. nguyeni); more spiniform setae on the dactylus of fifth pereiopod (29–40 vs. 25–27 in C. nguyeni).Caridina grammosticta sp. nov., resembles C. serrata Stimpson, 1860 by the long stylocerite (cf Cai and Ng 1999). However, it can be separated from C. serrata by shape and proportion of endopod of male first pleopod (reniform, tip rounded, outer margin convex, middle of the inner margin distinctly concave, 0.44–0.47 times as long as exopod and 2.56–3.19 times as long as wide vs. rectangular, inner margin concave, outer margin slightly convex, 0.70 times as long as exopod and 2.50 times as long as wide in C. serrata); appendix masculina of male second pleopod with fewer spiniform setae distally, more basally (vs. more spiniform setae distally, fewer basally in C. serrata); longer rostrum (reaching from middle of second segment to end of third segment of antennular peduncle segment vs. nearly reaching to or slightly reaching beyond end of basal segment of antennular peduncle in C. serrata); rostrum with more teeth (dorsum 14–20 teeth, postorbital region of carapace 6–10 teeth; ventrum 1–8 teeth vs. dorsum 5–17 teeth, postorbital region of carapace 0–5 teeth; ventrum 0–6 teeth in C. serrata); the slender scaphocerite (4.1–4.4 times as long as wide vs. 3.0 times in C. serrata).Caridina grammosticta sp. nov., resembles C. argilla Chow et al., 2026 by the long stylocerite and slightly concave inner margin endopod of male first pleopod (cf Chow et al. 2026). However, it can be separated from C. argilla by the shape and proportion endopod of male first pleopod (endopod 0.44–0.47 times as long as exopod, slender medially, slightly wider basally and distally; vs. 0.65–0.80 times as long as exopod, distally wider than basally in C. argilla); appendix masculina of male second pleopod shorter, with fewer spiniform setae distally and more basally; 0.50–0.59 times as long as endopod (vs. 0.70–0.75 times as long as endopod, with more spiniform setae distally and fewer basally in C. argilla); longer rostrum (reaching from middle of second segment to end of third segment of antennular peduncle segment vs. slightly falling short of or reaching to the end of basal segment of antennular peduncle in C. argilla); and relatively larger eggs (0.87–0.90 mm × 1.22–1.43 mm vs. 0.69–0.75 × 0.97–1.05 mm in C. argilla).Molecular results.The intraspecific COI p-distances of the new species ranged from 0.0 % to 0.9 %. Genetically, the new species was closest to C. stellata (11.8 % – 12.0 %) and C. serrata (13.2 % – 13.5 %). Higher genetic divergences were detected with C. cantonensis (19.4 % – 19.7 %), C. mariae (19.5 % – 19.9 %) and C. argilla (17.2 % – 17.5 %).For the 16 S rRNA gene, the intraspecific p-distances of the new species ranged from 0.0 % to 0.9 %. Genetically, the new species showed the lowest divergence with C. tricincta and C. breviata (5.3 % – 5.8 %). Moderate divergences were observed with C. sphyrapoda (7.0 % – 7.3 %), C. stellata (6.8 % – 7.0 %), C. serrata (6.5 % – 7.3 %), C. argilla (7.5 % – 7.8 %), C. cantonensis (8.0 % – 8.8 %) and C. mariae (8.0 % – 8.3 %). (Fig. 4, Suppl. materials 1, 2).Coloration(Fig. 1 C). The habitat conditions of the three sampling sites are similar; the body coloration and patterns of the population individuals are consistent, with excellent identifiability in the field. The body is light red and translucent, with seven narrow reddish-brown transverse stripes. One discontinuous curved stripe occurs on the posterolateral margin of the cephalothorax. Each tergum of the first and second somites bears a short stripe on its upper part. Each tergum of the third to sixth somites possesses a stripe extending across the entire plate; the stripe on the sixth somite is the broadest. Numerous deep red irregular spots scattered on the cephalothorax and tergum of the second somite. The distal ends of the second and third antennule segments each bear a deep red ring. The third maxilliped has deep red rings on the base and distal end of its basal segment, the distal end of the second segment, and the middle of the third segment. The distal ends of the ischium, merus and carpus of the first to fifth pereiopods are each marked with a deep red ring. The telson and distal parts of the uropods are bright red.Ecology notes(Fig. 1 E). The new species is currently known only from three localities: QNNR, Wenzhu Town, Zhaoping County, Hezhou City, Nanbianshan Town, Lingui District, Guilin City, and Zhongliang Township, Jinxiu County, Laibin City. These streams occur at 500–725 m above sea level, with consistent habitat features: width 1–2 m, water depth 15–30 cm, dissolved oxygen 8–9 mg / L, pH 6.8–6.9, rocky substrate and slow current. The shrimps inhabit beneath leaf litter or crawl on rock surfaces.Etymology.The specific epithet grammosticta is derived from two Greek words: grammē (line) and stiktos (spot or punctate), referring to the species having both linear markings and punctate spots.Distribution.QNNR, Wenzhu Town, Zhaoping County, Hezhou City, Nanbianshan Town, Lingui District, Guilin City and Zhongliang Town, Jinxiu County, Laibin City, Guangxi.

Neocaridina palmata (Shen, 1948)Caridina palmata Shen, 1948: 120, pl. 12. [type locality: Chongqing City, southwest China].Caridina elongata Shen, 1948: 121, pl. 13.Caridina denticulata vietnamensis D…

Neocaridina palmata (Shen, 1948)Caridina palmata Shen, 1948: 120, pl. 12. [type locality: Chongqing City, southwest China].Caridina elongata Shen, 1948: 121, pl. 13.Caridina denticulata vietnamensis Dang, 1967: 157, fig. 4. [Cao Bang and Lang Son provinces, Vietnam].Caridina vietnamensis Dang, 1975: 72; Dang et al. 1980: 410–412, fig. 234.Caridina denticulata Liang & Yan, 1986: 197; Liang and Zhou 1993: 231; Liang et al. 1993: 41.Neocaridina palmata palmata Cai, 1996; Liang 2004: 103–107; Do et al. 2021: 45–64, figs 10–13.Neocaridina palmata Li, 1997: 455; Li and Liang 2002: 708; Chen et al. 2018: 538–539, fig. 5; Shih et al. 2024: 17–21, figs 8–10.Neocaridina vietnamensis Dang & Do, 2008: 8; Dang and Ho 2012: 159–163, fig. 55.Specimens examined.China - Guangxi: • 5 ♂♂, cl 4.8–5.2 mm, (CAS 546801014), a stream in QNNR, Wenzhu Town, Zhaoping County, Hezhou City, 24°22'04"N, 110°48'32"E, al. 516 m, stn. 2, coll. ZHENG J. C., 10 Mar. 2026. • 4 ♀♀, cl 5.0– 6.6 mm, (CAS 546801015), stream in QNNR, Wenzhu Town, Zhaoping County, Hezhou City, 24°19'14"N, 110°49'28"E, al. 327 m, stn. 3, coll. ZHENG J. C., CHEN X. X., PAN H. F., 10 Mar. 2026.Remark.Neocaridina palmata has relatively conservative morphological characteristics. The rostrum usually extends to the end of the third segment of the antennular peduncle, with 2–4 postorbital teeth dorsally (Chen et al. 2018). A pterygostomian spine is present on the anterolateral margin of the carapace. The endopod of the male first pleopod is palmate, and the appendix masculina of the second pleopod is globular. The propodus of the third and fourth pereiopods is straight, with no obvious sexual dimorphism. Females have high fecundity and large eggs (Liang 2004). Morphological comparisons reveal that specimens collected from QNNR fully conform to the above-mentioned diagnostic features. Molecular analyses reveal negligible genetic divergence from known populations, with 100 % sequence similarity to LC 324770, a sequence generated from specimens collected in Leye, Guangxi (Shih et al. 2024).Neocaridina palmata exhibits strong dispersal ability and environmental adaptability. It is mainly distributed in central and southern China, with its northern range limit in Hubei and Anhui provinces and western range limit in Yunnan and Sichuan provinces. Its distribution extends to southern China and northern Vietnam (Li and Liang 2002; Liang 2004; Shih et al. 2024). This species commonly inhabits various freshwater habitats, including small and medium-sized rivers, streams, lakes, reservoirs, ponds, ditches and paddy fields (Liang 2004). Field surveys indicate that this species has strong competitive dominance over other shrimps. It can form high-density populations with high productivity in habitats with dense vegetation.Neocaridina palmata, owing to its high reproductive output, serves as a valuable biological resource for local residents, including use as human food, poultry feed, angling bait, and ornamental aquarium subjects.Coloration.The body is translucent grey with black to brownish spots. Some specimens are entirely pigmented in varying brown hues, while others bear a pale dorsal stripe (Fig. 1 D).Habitats.Shrimps often gather densely among waterside vegetation and under fallen leaves in streams, and crawl on sandy and rocky stream substrates.Distribution.China (Chongqing, Sichuan, Yunnan, Guangxi, Guizhou, Hunan, Hubei, Jiangxi, Anhui, Zhejiang, Fujian, Guangdong) and Vietnam.

El trabajo analiza el papel del espacio público en el envejecimiento saludable, considerando la interacción social como factor clave para el bienestar y la generación de capital s…

El trabajo analiza el papel del espacio público en el envejecimiento saludable, considerando la interacción social como factor clave para el bienestar y la generación de capital social. Mediante observación y mapeado de las interacciones de personas mayores en plazas de Almendrales, Lavapiés y Malasaña (Madrid), identifica condiciones espaciales que favorecen el encuentro, las relaciones sociales y la participación, aportando criterios para la regeneración urbana de barrios

  BACKGROUND — Contemporary artificial intelligence systems based on probabilistic language models achieve remarkable empirical performance but lack formal guarantees of termination, logica…

  BACKGROUND — Contemporary artificial intelligence systems based on probabilistic language models achieve remarkable empirical performance but lack formal guarantees of termination, logical correctness, and reasoning stability. Existing neuro-symbolic architectures restore decidability but abandon adaptive regulation. Satisfying decidability, dynamic convergence, hormonal metacognitive control, and modular sparse orchestration simultaneously has remained an open architectural challenge; no unified framework  to our knowledge has yet met all four requirements. METHODS — This article introduces S-AI-RLM, an extension of the Sparse Artificial Intelligence paradigm that integrates three formally coupled layers: (i) a recursive symbolic core grounded in recursive language theory, implementing a total symbolic decision function that halts and returns a certified answer on every valid input; (ii) a hormonally regulated dynamical system governed by six artificial hormones whose global asymptotic stability is established by a Lyapunov argument; and (iii) a triadic metacognitive regime — Accept, Clarify, or Reject (ACR) — formalised as an optimal control policy. The architecture is realised through twelve agents organised in three functional layers and coupled to a large language model via a semantic translation module with formally characterised fidelity and polynomial-time computability. RESULTS — Five theorems are established: global asymptotic stability of the hormonal regulatory field (Theorem 1), formal equivalence between hormonal convergence and totality of the ACR stopping procedure (Theorem 2), finite-time termination with an explicit three-term bound (Theorem 3), a quadruple equivalence of Lyapunov stability, entropic contraction, symbolic coherence, and totality of the ACR procedure (Theorem 4), and Lyapunov stability of the full hybrid system (Theorem 5). Experimental validation on our evaluation testbench across four standard reasoning benchmarks and against four reference systems confirms a decidability rate of 100% on the evaluated suite, a decision accuracy exceeding 84%, monotonic entropy reduction across iterations, and a frugality index of at least 0.71 — with fewer than ten million parameters. CONCLUSIONS — S-AI-RLM demonstrates that an intelligent system can simultaneously be adaptive, formally decidable, convergent, and explainable. The framework defines a new class of AI architectures grounded in the principle: not self-improving intelligence, but self-converging, regulated, and decidable intelligence.