7,832 research outputs found
The local spectrum of the Dirac operator for the universal cover of SL_2(R)
No full textUsing representation theory, we compute the spectrum of the Dirac operator on the universal covering group of SL2(R)SL2(R), exhibiting it as the generator of KK1(C,A)KK1(C,A), where AA is the reduced C?C?-algebra of the group. This yields a new and direct computation of the K -theory of AA. A fundamental role is played by the limit-of-discrete-series representation, which is the frontier between the discrete and the principal series of the group. We provide a detailed analysis of the localised spectra of the Dirac operator and compute the Dirac cohomology
Resonant indirect Fowler–Nordheim tunneling in Al0.8Ga0.2As barrier
No full textOscillatory current-voltage characteristics of n+-GaAs/semi-insulating Al0.8Ga0.2As/nGaAs heterojunction barriers (400 angstrom thick) grown by molecular beam epitaxy on n+-GaAs (100) substrates are observed at 4 K when the heterostructures are placed under the transverse uniaxial stress along [011] direction (perpendicular to current direction) above 4 kbar. We attribute these oscillations to the resonant indirect Fowler-Nordheim tunneling via [011] oriented transverse X valleys, where the change of wave vector is required for tunneling
Amblyceps cerinum Ng & Wright, 2010, sp. nov.
No full textAmblyceps cerinum sp. nov. (Fig. 1) Amblyceps mangois (in part)— Hora 1933: 617. Amblyceps apangi (non Nath & Dey)— Sullivan et al. 2008: 64; Ng & Wright 2009: 374. Type material. Holotype: UMMZ 248850, 72.8 mm SL; India, West Bengal, Raidak I River at Shipra, just outside Buxa Tiger Reserve approx. 8 km toward Barobisha on Siliguri-Guwahati road, 26 ° 31 ’ 12 ”N, 89 ° 43 ’ 25 ”E; A. Rao, 30 January 2010. Paratypes: BMNH 1932.4.22.2– 5 (3), 28.1–30.8 mm SL; RMNH 16093 (2), 38.6–51.6 mm SL; India: West Bengal, Sevoke stream, Tista Valley; S. L. Hora, February 1931. CAS-SU 69784 (1), 42.8 mm SL; India: West Bengal, Kalimpong Duars and Siliguri Terai; S. L. Hora, November 1938. UMMZ 248834 (4), 59.0– 89.2 mm SL; collection data as for holotype. UMMZ 248835 (21), 61.4–97.3 mm SL; locality data as for holotype; A. Rao, 23 March 2010. UMMZ 244754 (7), 30.0–83.0 mm SL; locality data as for holotype; H. H. Ng et al., 13 April 2004. Diagnosis. Amblyceps cerinum differs from all congeners except A. apangi, A. murraystuarti, and A. torrentis in having a truncate (vs. forked or strongly emarginate) caudal fin. It differs from A. apangi in having a longer adipose-fin base (32.4–38.3 % SL vs. 24.3 –32.0), a more slender caudal peduncle (9.2–11.2 % SL vs. 11.3–15.4), a greater number of post-Weberian vertebrae (41–44 vs. 38) and in having the lateral line terminating just posterior to the vertical through the dorsal-fin insertion (vs. extending to the end of the caudal peduncle), from A. murraystuarti in having a more slender body (9.2–11.2 % SL vs. 11.6 –15.0), a longer caudal peduncle (21.9–24.5 % SL vs. 19.6–22.6) and the posterior end of the adipose fin not broadly confluent with the dorsal procurrent caudal-fin rays and separated from them by a distinct notch (vs. adipose fin broadly confluent with dorsal procurrent caudal-fin rays and not separated by a distinct notch), and from A. torrentis in having a more slender body (9.2–11.9 % SL vs. 15.3–17.3 % SL) and caudal peduncle (9.2–11.2 % SL vs. 13.8– 15.6), the upper jaw longer than the lower jaw (vs. jaws equal), and an incomplete lateral line terminating at the posterior base of the dorsal fin (vs. a complete lateral line terminating at the base of the caudal fin). Description. Biometric data in Table 1. Body elongate, semi-cylindrical anterior to pelvic fins, compressed posterior to pelvic fins. Predorsal profile convex; gently sloping ventrally from dorsal-fin origin to tip of snout; contour smooth except for noticeable notch formed by origin of jaw adductor muscles on skull. Postdorsal profile relatively straight from dorsal-fin insertion to vertical through anal-fin origin, becoming gently convex posterior to vertical through anal-fin origin. Preanal profile convex from tip of snout to vertical through dorsal-fin origin, becoming convex from vertical through dorsal-fin origin to anal-fin origin. Postanal profile straight or slightly concave. Skin on flanks, head, and all fins covered with small, granular papillae, clearly visible under magnification. Lateral line incomplete, terminating at point slightly posterior to vertical through dorsal-fin insertion. No discernible difference in urogenital morphology between males and females. Head depressed, broad, wedge-shaped in lateral profile. Snout long, acutely triangular when viewed laterally, broadly rounded when viewed dorsally. Anterior nostril located at base of nasal barbel, forming short, ovaline tube. Anterior margin of posterior nostril confluent with posterior base of nasal barbel; posterior margin surrounded by short flap of skin. Gill membranes narrowly joined at isthmus. Eye located dorsally, well posterior of nasal barbel, subcutaneous, ovoid, horizontal axis longest. Interorbital area markedly concave. Mouth subterminal, upper jaw extending well beyond lower, lips thickened and papillate. Premaxillary teeth short, conical, posteriorly directed; arranged in semi-rectangular band with well developed posterior extensions. Mandibular teeth small, conical, arranged in narrow crescentic band. Maxillary barbel short, when adpressed reaching just beyond origin of pectoral fin. Nasal barbel short, when adpressed posteriorly, reaching far beyond posterior margin of eye. Lateral mandibular barbel reaching to posterior base of pectoral fin. Medial mandibular barbel short, less than ¼ length of head. All barbels lacking membrane. Dorsal fin i, 5 (4) or i, 6 (21)*, origin at vertical through middle of pectoral fin; first element flexible, incompletely ossified. Pectoral fin i, 7 (23)* or i, 8 (2), first element flexible, incompletely ossified. Pelvic fin with i, 5 (25) rays, located approximately at vertical through midpoint between dorsal-fin insertion and adipose-fin origin. Anal fin with iv, 8 (3), iv, 9 (4), v, 8 (10)* or v, 9 (6) elements, margin rounded, origin at point 1 / 3 distance between pelvic-fin origin and caudal-fin origin. Caudal fin with x,7,8,xii (1), xi,8,8,xi (2), xi,8,8,xii (4), xi,8,8,xiii (1), xii,8,7,xii (1), xii,8,8,xi (1), xii,8,8,xii (10)*, xii,8,8,xiii (1), xii,8,9,xiii (1) or xiii,8,8,xiii (1) rays; emarginate; upper lobe slightly longer than lower, terminating in short filament. Adipose fin long, low, upper margin convex; origin at vertical midway between adpressed tip of pelvic fin and anal-fin origin. Vertebral column with 41 (6), 42 (9)*, 43 (6) or 44 (3) post-Weberian vertebrae. Coloration. In 70 % ethanol: Dorsum and upper flanks reddish beige to light gray. Lower flanks beige, trending lighter toward cream-colored belly. Nasal and maxillary barbels with gray basally, becoming lighter distally. Mandibular barbels cream colored. Dorsum coloration extending onto base of dorsal and adipose fins; both fins with lighter outer margin, very thin on adipose fin. Pectoral, pelvic, and anal fins with very faint pigmented area at base, otherwise uniformly cream colored. Caudal fin uniformly dusky, upper rays slightly more so than lower. Live color similar, but with a strong brownish- or orange-yellow hue (Fig. 2). Distribution and habitat. Amblyceps cerinum is known only from the Brahmaputra River drainage in northern West Bengal, India (Fig. 3). The type locality is a shallow, swift-flowing stream with a substrate of cobble and sand (Fig. 4). The fish were frequently found under cobble. Etymology. The specific epithet derives from the Latin adjective cerinus, meaning wax-colored. This name is used in allusion to the yellowish coloration in life of this species.Published as part of Ng, Heok Hee & Wright, Jeremy J., 2010, Amblyceps cerinum, a new catfish (Teleostei: Amblycipitidae) from northeastern India, pp. 50-60 in Zootaxa 2672 on pages 51-55, DOI: 10.5281/zenodo.19916
Wetland Eutrophication: Early Warning Biogeochemical Indicators
No full textSL-304, a 3-page illustrated fact sheet by Alan L. Wright, describes the effects of nutrients in the Everglades and identifies sensitive early-warning indicators of ecological changes. Includes references. Published by the UF Department of Soil and Water Science, July 2009.
SL 304/SS517: Wetland Eutrophication: Early Warning Biogeochemical Indicators (ufl.edu
Environmental Consequences of Water Withdrawals and Drainage of Wetlands
No full textSL-302, a 3-page fact sheet by Alan L. Wright, educates the general public about how hydrologic conditions, such as drought and water withdrawal, influence the functioning and benefits of wetland ecosystems. Includes additional sources of information. Published by the UF Department of Soil and Water Science, July 2009.
SL 302/SS515: Environmental Consequences of Water Withdrawals and Drainage of Wetlands (ufl.edu
Environmental Consequences of Water Withdrawals and Drainage of Wetlands
No full textSL-302, a 3-page fact sheet by Alan L. Wright, educates the general public about how hydrologic conditions, such as drought and water withdrawal, influence the functioning and benefits of wetland ecosystems. Includes additional sources of information. Published by the UF Department of Soil and Water Science, July 2009.
SL 302/SS515: Environmental Consequences of Water Withdrawals and Drainage of Wetlands (ufl.edu
Wetland Eutrophication: Early Warning Biogeochemical Indicators
No full textSL-304, a 3-page illustrated fact sheet by Alan L. Wright, describes the effects of nutrients in the Everglades and identifies sensitive early-warning indicators of ecological changes. Includes references. Published by the UF Department of Soil and Water Science, July 2009.
SL 304/SS517: Wetland Eutrophication: Early Warning Biogeochemical Indicators (ufl.edu
Tanganikallabes alboperca Wright & Bailey 2012, SP. NOV.
No full textTANGANIKALLABES ALBOPERCA SP. NOV. <p>(FIGS 3B, E, 4B, 5B, 9, 10, 11B; TABLES 3, 4)</p> <p> <i>Diagnosis: Tanganikallabes alboperca</i> sp. nov. is distinguished from all congeners by its relatively shorter pelvic fins (6.0–7.7% SL versus 7.1–9.3% SL in other <i>Tanganikallabes</i> species), which do not reach past the origin of the anal fin when adpressed (versus reaching past the anal fin origin in all other <i>Tanganikallabes</i> species). It is also distinct from other <i>Tanganikallabes</i> species in the presence of a well-defined, depigmented border on the operculum, which extends from the upper margin of the operculum all the way to the union of the gill membranes at the isthmus (border absent in <i>T. mortiauxi</i> and <i>T. stewarti</i> sp. nov.).</p> <p> <i>Tanganikallabes alboperca</i> sp. nov. is further distinguished from <i>T. mortiauxi</i> by its premaxillary toothpad shape (uniformly thin, broad crescent versus widest point anteroposteriorly thicker than the premaxillary toothpad in <i>T</i>. <i>mortiauxi</i>; Fig. 4), io-iv and the suprapreopercle consisting of multiple separate elements (versus a single element in <i>T. mortiauxi</i>; Figs 3, 5), the extensions of the lateral ethmoid not reaching io-ii when viewed from above (versus nearly or completely overlying io-ii in <i>T. mortiauxi</i>; Fig. 3), its incomplete lateral line (versus complete in <i>T. mortiauxi</i>), shorter pectoral fin spine (3.6–5.3% SL versus 5.6–8.8% SL in <i>T. mortiauxi</i>), generally lower number of dorsal fin rays [65–74 (modally 70) versus 72–81 (modally 80) in <i>T. mortiauxi</i>], smaller eye (0.8– 1.6% SL versus 1.8–3.0% SL in <i>T. mortiauxi</i>), and lack of a free lower orbital margin. <i>Tanganikallabes alboperca</i> sp. nov. is further separated from <i>T. stewarti</i> sp. nov. by having a relatively deeper body (body depth at anus 11.7–14.6% SL versus 8.7–10.9% SL in <i>T. stewarti</i> sp. nov.), longer lateral line (see below description of <i>T. stewarti</i> sp. nov.), greater preanal length (45.2– 49.0% SL versus 42.4–44.8% SL in <i>T. stewarti</i> sp. nov.), and by generally having a lower number of anal fin rays [55–63 (modally 59) versus 63–69 (modally 65) in <i>T. stewarti</i> sp. nov.].</p> <p> <i>Description:</i> Morphometric data in Table 4, frequency distributions of selected meristic data in Table 3. Maximum TL 180 mm, SL 160 mm. Body elongate, moderately compressed posterior to origin of dorsal fin. Predorsal slightly convex, with small indentation formed by curvature and insertion of cheek muscles on skull. Prepelvic profile slightly convex. Skin on body forming numerous vertical ridges and folds; extending onto and encasing all fins.</p> <p>Head depressed and broad; skin thick; lateral cranial muscles hypertrophied, forming trough in centre of head over bones of skull. Snout short, with bluntly rounded margin when viewed dorsally; acute, narrow margin when viewed laterally. Anterior nostrils tubular; posterior nostrils poorly visible, located at posterior base of nasal barbel. Opercular flap extending over base of pectoral fin spine. Eye small, located dorsolaterally; circular; lacking free margin. Interorbital area broad, flat.</p> <p>fin i,5; tip of adpressed fin does not reach beyond origin of anal fin. Anal fin elongate, with 55–63 branched rays; posterior margin not joined with caudal fin. Caudal fin i,7,8,i; rounded.</p> <p> <i>Coloration in alcohol:</i> Dorsum and flanks uniformly light to dark brown, ventral surfaces noticeably lighter (Fig. 9). All barbels pigmented as body on their proximal half, distal half lacking pigmentation. All fins with brownish bases and narrow, depigmented border; border wider in younger specimens. Operculum with wide, depigmented margin, extending onto underside of head.</p> <p> <i>Distribution:</i> Lake Tanganyika. <i>Tanganikallabes alboperca</i> sp. nov. is apparently distributed lakewide, although existing collections come only from the extreme southern and northern areas of the lake (Fig. 10).</p> <p> <i>Habitat:</i> Habitat details for this species are absent for the collections examined. It is likely to inhabit rocky bottoms, over a range of depths, as is the case for <i>T. mortiauxi</i>.</p> <p>Mouth terminal; lips narrow and papillate; jaws equal, or upper jaw slightly longer. Mandibular, premaxillary, and vomerine teeth pointed, unicuspid, arranged in multiple transverse rows. Toothpads granular in appearance because of embedding of teeth in fleshy pad for most of their length. Mandibular toothpad wide, crescentic. Premaxillary toothpad broadly curved, rectangular, noticeably wider than vomerine toothpad. Vomerine toothpad located immediately posterior to premaxillary; narrow; broadly curved; crescentic.</p> <p>Nasal barbel short; not extending to any aspect of opercular flap. Maxillary barbel occasionally extends beyond margin of opercular flap, but is usually shorter. Lateral mandibular barbel extending to, or slightly beyond, lower opercular margin. Medial mandibular barbel short, slightly over half the lateral mandibular barbel length. All barbels smooth, with very narrow basal membrane.</p> <p> Dorsal fin elongate, lacking spine, with 65–74 soft rays; origin located well behind vertical through posterior tip of adpressed pectoral fin; posterior margin not joined with caudal fin. Pectoral fin I,7,8; strong spine, well-developed venom glands present; spine approximately half the length of pectoral fin; posterior margin of spine with between zero and five very small, retrorse serrations. Adipose fin absent. Pelvic <i>Diet:</i> The stomachs of three specimens (from UMMZ 199937 and UMMZ 199861) contained, collectively, fish eggs (species indeterminate), the remains of a single platythelphusid crab, and insect larvae.</p> <p> <i>Etymology:</i> The specific epithet, <i>alboperca</i>, is a combination of the latin adjective <i>alba</i>, meaning white, and the noun <i>operculum</i>, meaning lid or cover, a reference to the distinctive depigmented posterior margin seen in the operculum of this species. Gender: feminine.</p> <p> <i>Material examined:</i> Holotype: UMMZ 199936 (153 mm SL), E. side of Nyika Bay, N. side of Nkumbula Island, Zambia Lake Tanganyika, 31.X.1970. Paratypes: UMMZ 199937 (7 alc, 1 c&s; 102– 155 mm SL), collection data as for holotype; UMMZ 199861 (27 alc, 2 c&s; 47–152 mm SL), N. end of Nkumbula Island, 2 km N. of Mpulungu, Zambia, Lake Tanganyika, 1.XI.1970; UMMZ 196021 (2 alc; 122–146 mm SL), Zambia, Lake Tanganyika (no additional data); SAIAB 76160 (3 alc; 66– 145 mm SL), Mbita Island (north-west end), 8°45.18′S, 31°05.07′E, Zambia, Lake Tanganyika, 29.II.2004; SAIAB 86974 (1 alc; 115 mm SL), Sumbu, 8.5167°S, 30.4833°E, Zambia. Lake Tanganyika, 00. V.1983; SAIAB 86968 (1 alc; 105 mm SL), Chimba, 08°25.27′S, 30°27.44′E, Zambia, Lake Tanganyika, 07.III.2004; SAIAB 80225 (1 alc; 99 mm SL), Chituta Bay, cliffs, bottom of bay on west side, 8°43.82′S, 31°9.41′E, Zambia, Lake Tanganyika, 09.III.2004; MRAC 125751 (1 alc; 104 mm SL), Luhanga, Lake Tanganyika, 13.II.1959; MRAC 78025.0013, 78025.0014 (2 alc; 83–104 mm SL), Cape Kabeyeye, Zambia, Lake Tanganyika, I.1978; MRAC 78025. 0013, 78025.0014 (1 alc; 93 mm SL), Cape Kabeyeye, Zambia, Lake Tanganyika, I.1978; MRAC 76004.0566 (1 alc; 126 mm SL), Cape Nunda, southern Lake Tanganyika, Zambia, 6.I.1976; MRAC 130952– 130970 (4 alc; 141–161 mm SL), Kalungwe, Lake Tanganyika, 11.VII.1961; MRAC 187088 (1 alc; 104 mm SL), Nkumbula Island, Lake Tanganyika, Zambia, 14.VII.1965; MRAC 81062.0001 (1 alc; 146 mm SL), Kabimba, 50 km N. Albertville, Lake Tanganyika, Democratic Republic of Congo, 7.IV.1981.</p>Published as part of <i>Wright, Jeremy J. & Bailey, Reeve M., 2012, Systematic revision of the formerly monotypic genus Tanganikallabes (Siluriformes: Clariidae), pp. 121-142 in Zoological Journal of the Linnean Society 165 (1)</i> on pages 129-131, DOI: 10.1111/j.1096-3642.2011.00789.x, <a href="http://zenodo.org/record/5407190">http://zenodo.org/record/5407190</a>
Tanganikallabes stewarti Wright & Bailey 2012, SP. NOV.
No full textTANGANIKALLABES STEWARTI SP. NOV. <p>(FIGS 3C, 4B, 11–13; TABLES 3, 5)</p> <p> <i>Diagnosis: Tanganikallabes stewarti</i> sp. nov. is distinguished from all congeners by having an incomplete lateral line, which terminates at a vertical through a point approximately two-thirds of the distance along the anal fin base (versus lateral line reaching the caudal peduncle in <i>T. mortiauxi</i> and extending much closer to the caudal peduncle in <i>T. alboperca</i> sp. nov.; Fig. 11), and by its relatively shallower body (body depth at anus 8.7–10.9% SL versus 12.3–17.2% SL in <i>T. mortiauxi</i> and 11.7–14.6% SL in <i>T. alboperca</i> sp. nov.).</p> <p> <i>Tanganikallabes stewarti</i> sp. nov. is further separated from <i>T. mortiauxi</i> by its premaxillary toothpad shape (uniformly thin, broad crescent versus widest point anteroposteriorly thicker than the premaxillary toothpad in <i>T</i>. <i>mortiauxi</i>; Fig. 4), lack of a free lower orbital margin, io-iv and the suprapreopercle consisting of multiple separate elements (versus a single element in <i>T. mortiauxi</i>; Figs 3, 5), the extensions of the lateral ethmoid not reaching io-ii when viewed from above (versus nearly or completely overlaying io-ii in <i>T. mortiauxi</i>; Fig. 3), its proportionally shorter prepelvic (35.7–39.2% SL versus 39.7–44.4% SL in <i>T. mortiauxi</i>) and preanal (42.4–44.8% SL versus 47.1– 51.7% SL) lengths, longer anal fin (anal fin base 54.1–58.9% SL versus 47.6–54.2% SL in <i>T. mortiauxi</i>). It can additionally be distinguished from <i>T. alboperca</i> sp. nov. by its lack of a depigmented opercular margin, having longer pelvic fins (7.1–9.3% SL versus 6.0–7.7% in <i>T. alboperca</i> sp. nov.), which reach beyond the origin of the anal fin when adpressed, proportionately longer pectoral fin spines (5.0–6.8% SL versus 3.6–5.3% SL in <i>T</i>. <i>alboperca</i> sp. nov.), a shorter preanal length (42.4– 44.8% SL versus 45.2–49.0% SL in <i>T. alboperca</i> sp. nov.), and a (generally) higher number of dorsal fin rays [72–79 (modally 76) versus 65–74 (modally 70) in <i>T. alboperca</i> sp. nov.] and anal fin rays [63–69 (modally 65) versus 55–63 (modally 59) in <i>T. alboperca</i> sp. nov.].</p> <p>*Value for holotype.</p> <p> <i>Description:</i> Morphometric data are presented in Table 5, with the frequency distributions of selected meristic data presented in Table 3. Maximum TL 170 mm, SL 155 mm. Body elongate, moderately compressed posterior to origin of dorsal fin. Predorsal</p> <p>Nasal barbel short; not extending to any aspect of opercular flap. Maxillary and lateral mandibular barbels extending to, or slightly beyond, tip of adpressed pectoral fin spine. Medial mandibular barbel extending slightly beyond lower opercular margin. All barbels smooth, with very narrow basal membrane.</p> <p>Dorsal fin elongate, lacking spine, with 72–79 soft rays; origin located well behind vertical through posterior tip of adpressed pectoral fin; posterior margin not joined with caudal fin. Pectoral fin I,7–9: strong spine, well-developed venom glands present; spine approximately two-thirds the length of pectoral fin; posterior margin of spine with between zero and five very small, retrorse serrations. Adipose fin absent. Pelvic fin i,5: tip of adpressed fin reaches beyond origin of anal fin. Anal fin elongate, with 63–69 branched rays; posterior margin not joined with caudal fin. Caudal fin i,7,8,i: rounded.</p> <p>profile convex, with distinct hump formed between origin of dorsal fin and basioccipital; only slightly convex from basioccipital to snout. Prepelvic profile slightly convex. Skin on body forming numerous vertical ridges and folds; extending onto and encasing all fins.</p> <p>Head depressed and broad; skin thick; lateral cranial muscles hypertrophied, forming trough in centre of head over bones of skull. Snout short, with bluntly rounded margin when viewed dorsally; acute, narrow margin when viewed laterally. Anterior nostrils tubular; posterior nostrils poorly visible, located at posterior base of nasal barbel. Opercular flap extending over base of pectoral fin spine. Eye small, located dorsolaterally; circular; lacking free margin. Interorbital area broad, flat.</p> <p>Mouth terminal; lips narrow and papillate; jaws equal, or upper jaw slightly longer. Mandibular, premaxillary, and vomerine teeth pointed, unicuspid, arranged in multiple transverse rows. Toothpads granular in appearance because of embedding of teeth in fleshy pad for most of their length. Mandibular toothpad wide, crescentic. Premaxillary toothpad broadly curved, rectangular, noticeably wider than vomerine toothpad. Vomerine toothpad located immediately posterior to premaxillary; narrow; broadly curved; crescentic.</p> <p> <i>Coloration in alcohol:</i> Dorsum and flanks brown to dark brown, with ventral surfaces slightly lighter, although less so than in other <i>Tanganikallabes</i> species. Some specimens (including holotype) show marbled appearance, with randomly arranged regions of lighter and darker coloration; other specimens uniform in dorsum and flank coloration (Fig. 12). Maxillary barbels uniformly brown, sometimes with slightly lighter pigmentation near tips. Nasal and mandibular barbels brown on proximal half, with distal portions becoming noticeably lighter. All rayed fins uniformly brown, with distinct, thin, white margin in smaller individuals.</p> <p> <i>Distribution:</i> Most collections come from the northern part of Lake Tanganyika (Fig. 13), although a single collection from the southern Zambian coastline indicates that <i>T. stewarti</i> sp. nov., like the other two known <i>Tanganikallabes</i> species, has a lakewide distribution.</p> <p> <i>Habitat:</i> Habitat details for this species are absent for the collections examined. It likely to inhabit rocky bottoms, over a range of depths, as is the case for <i>T. mortiauxi</i>.</p> <p> <i>Diet:</i> The stomach of the single specimen examined (UMMZ 196154) contained only the eggs of unidentified fish species.</p> <p> <i>Etymology:</i> The specific epithet of this species is a patronym in honour of American ichthyologist Donald J. Stewart, who collected the holotype and other material used in the description of this species, as well as assisting in the collection of much of the type series of <i>T. alboperca</i> sp. nov.</p> <p> <i>Material examined:</i> Holotype: UMMZ 249379 (155 mm SL), between Mutumba and Magara among rocks, 3°40′S, 29°20′E, Burundi, Lake Tanganyika, X.1973. Paratypes: UMMZ 196154 (3 alc, 1 c&s; 48–87 mm SL), collection data as for holotype; SAIAB 86970 (1 alc; 131 mm SL), Chimba, 08°25.27′S, 30°27.44′E, Zambia, Lake Tanganyika, 07.III.2004; MRAC 130959–130970 (8 alc; 83–147 mm SL), Kalungwe, Lake Tanganyika, 11.VII.1961; MRAC 130828–130832 (5 alc; 68–113 mm SL), Luhanga, Lake Tanganyika, 7.VII.1961; MRAC 94662 (1 alc; 112 mm SL), northern Lake Tanganyika (no additional collection data); MRAC 125723–125725 (3 alc; 81–109 mm SL), Kalungwe, Lake Tanganyika, 11.II. 1959; MRAC 130972–130974 (3 alc; 103–146 mm SL), Kalungwe, Lake Tanganyika, 13.VII.1961; MRAC 130769–130771 (3 alc; 77–100 mm SL), Mbemba, Lake Tanganyika, 10.VII.1961; MRAC 94670, 94671 (2 alc; 78–131 mm SL), Luhanga, Lake Tanganyika, 29.VII.1954.</p>Published as part of <i>Wright, Jeremy J. & Bailey, Reeve M., 2012, Systematic revision of the formerly monotypic genus Tanganikallabes (Siluriformes: Clariidae), pp. 121-142 in Zoological Journal of the Linnean Society 165 (1)</i> on pages 132-136, DOI: 10.1111/j.1096-3642.2011.00789.x, <a href="http://zenodo.org/record/5407190">http://zenodo.org/record/5407190</a>
Transformation of the endostyle of the anadromous sea lamprey, Petromyzon-marinus L, during metamorphosis .2. Electron-microscopy
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