identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
0C0C6C18FFBEFF8B7C43FE2AFABAFC10.text	0C0C6C18FFBEFF8B7C43FE2AFABAFC10.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Megalothorax calvignacensis Panina & Bedos & Deharveng & Schneider 2026	<div><p>Megalothorax calvignacensis sp. nov.</p><p>urn:lsid:zoobank.org:act: 32125530-4756-461A-8102-B42D30F60B70</p><p>Figs 1A–C, 2–3, 8, Tables 1–2</p><p>Diagnosis</p><p>Megalothorax calvignacensis sp. nov. belongs to the minimus -group (Schneider &amp; D’Haese 2013). The peculiar feature of this species is the black-grey colour of the body, common in the incertus -group ( M. nigropunctatus Schneider &amp; D’Haese, 2013, M. perspicillum Schneider &amp; D’Haese, 2013), but firstly seen in the minimus -group.</p><p>Although the new species is morphologically similar to several species of the genus – namely M. granulosus Schneider &amp; D’Haese, 2013, M. minimus Willem, 1900 sensu Schneider &amp; D’Haese, 2013, M. willemi Schneider &amp; D’Haese, 2013, it exhibits several distinctive features. In chaetotaxy, M. calvignacensis sp. nov. resembles M. granulosus, apart from the absence of chaetae β1, γ2, η4 (vs their presence in M. granulosus). In addition, the second pair of dorsal globular sensilla s3 is present in M. calvignacensis (vs absent in M. granulosus). Both species have a smooth mucro, 2+2 chaetae on the manubrium, an unpaired chaeta a0 on forehead and flame-shaped inner sensilla.</p><p>Megalothorax calvignacensis sp. nov. is similar to M. minimus by its smooth mucro, an unpaired chaeta a0 and similar chaetotaxy. In M. calvignacensis present chaeta ζ1 (vs absent in M. minimus), but in M. calvignacensis absent chaeta β1 (vs present in M. minimus). In addition, M. calvignacensis has flame-shaped inner sensilla (vs T-shaped in M. minimus). Adult specimens can be easily recognized from M. minimus by the pigmentation, orange in M. minimus (Fig. 1B, D–E).</p><p>With another widespread species, M. willemi, the new species shares the presence of flame-shaped inner sensilla, smooth mucro, an unpaired chaeta a0 and similar chaetotaxy. However, in M. calvignacensis sp. nov. the chaeta β1 is absent (vs present in M. willemi) and the chaeta ζ1 is present (vs absent in M. willemi); and M. willemi lacks pigmentation.</p><p>Etymology</p><p>Megalothorax calvignacensis sp. nov. is named after its type locality, the commune of Calvignac.</p><p>Type material</p><p>Holotype FRANCE • 1 ♀; Lot, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=1.78475&amp;materialsCitation.latitude=44.46041" title="Search Plazi for locations around (long 1.78475/lat 44.46041)">Calvignac</a>, mosses on rock face; 1.78475° E, 44.46041° N; 178 m a.s.l.; 25 Dec. 2023; Guy Bariviéra leg.; sample code nos 46-Q23-086, SMNG, slide no. SMNG-APT-AA04651.</p><p>Paratypes (9 ♀♀) FRANCE • 5 ♀♀; Lot, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=1.78475&amp;materialsCitation.latitude=44.46041" title="Search Plazi for locations around (long 1.78475/lat 44.46041)">Calvignac</a>, mosses on rock face; 1.78475° E, 44.46041° N; 178 m a.s.l.; 25 Dec. 2023; Guy Bariviéra leg.; Apterygota collection SMNG, slides nos SMNG-APT-AA04652 to SMNG-APT-AA04655, tube no. SMNG-APT-EA-003-001 • 2 ♀♀; same data as for preceding; MSPU, slides nos LD 46-Q23-086-A, LD 46-Q23-086-B • 2 ♀♀; same data as for preceding; MNHN, slides nos 46-Q23-086A, 46-Q23-086B .</p><p>Other material examined</p><p>FRANCE • 6 specs in ethanol; Lot, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=1.78475&amp;materialsCitation.latitude=44.46041" title="Search Plazi for locations around (long 1.78475/lat 44.46041)">Calvignac</a>, mosses on rock face; 1.78475° E, 44.46041° N; 178 m a.s.l.; 25 Dec. 2023; Guy Bariviéra leg.; Apterygota collection SMNG, tube no. SMNG-APT-EA-003-001 • several specs in ethanol; same data as for preceding; MNHN .</p><p>Description</p><p>GENERAL ASPECT. Habitus and segmentation typical of the genus. Body length up to 500 µm. Specimens grey in alcohol (Fig. 1A–C). General chaetotaxy typical of the genus, trichobothria not studied. All chaetae ordinary, not lanceolate.</p><p>INTEGUMENT. Secondary granulation made of the usual dorsal rough granule. Integumentary channels extending laterally and dorsally in anterior and posterior parts of head. Anterior canal branching. Channels connection with linea ventralis roundabout-like.</p><p>SENSORY FIELDS AND WAX RODS (Fig. 2A). Sensory fields (sf 1–6) and their inner sensilla, as well as wax rod crypts wrc 1–7 with typical distribution of the genus. All inner sensilla of sensory fields are flame-shaped, the inner sensilla of sf 2 broad.</p><p>MOUTHPARTS. Labrum as typical of the genus (Fig. 2C). Chaetae a1 pointing inward, with two teeth. Chaetae a2 with two small teeth. Labium with 4+4 proximal chaetae (Fig. 2D). Basomedian field with 3+ 3 chaetae. Labial palp (Fig. 2D) typical of the genus (A, B, C, D, E, b1, b2, d1, d 2, 2e, H, h1, h2). Oral fold and maxillary outer lobe typical of the genus, without sublobal hair (Fig. 2E). Maxillary head without strong modification. Mandibula ordinary (Fig. 2F).</p><p>Head chaetotaxy. Forehead chaetotaxy as on Fig. 2B. Clypeal-labral formula: a0; 2, 4, 5, 4, 5, 4. Chaeta a0 present. Dorsal posterior area with 18 ordinary chaetae (Fig. 2B). Ventral side with three pairs of post-labial chaetae. Trend for posterior chaetae to be longer and stronger than anterior chaetae.</p><p>ANTENNAL CHAETOTAXY (Fig. 3A–B). Ant. I and II with one and four chaetae, respectively. Ant. III with seven chaetae and two long S-chaetae (S1 and S4). Striations of Ant III sensory organ short sensilla (S2 and S3) distinguishable in light microscopy. Ant. IV with seven chaetae (X-chaeta present) and ten S-chaetae. Sensory organ with Sx, Sy, Or, a, Sa. Organite (Or) of Ant IV short, seems apically flared. Summary on antennal chaetotaxy provided in Table 1.</p><p>BODY CHAETOTAXY. Th. II with 12 + 12 chaetae, 1+ 1 tubular and curved s1-sensilla (Fig. 2A). All chaetae ordinary. Th. III with 10 + 10 chaetae (some chaetae more lanceolate), 6+ 6 free wax-rods (wrc1–6). Chaeta a6 is longer and stronger than chaeta a5. Abd I–V terga with 20+20 ordinary chaetae, with 1 +1 wrc (wrc 7 ordinary), 1 +1 globular sensilla s2 (Fig. 2A). Sensilla s3 absent.</p><p>LEGS CHAETOTAXY. Typical of the genus (Table 2), consisting of ordinary chaetae of variable size (Fig. 3C– E).</p><p>CLAWS. Claw III bulkier than claw I and II. Claws subequal in unguis length (with a trend as unguis I&gt; unguis II&gt; unguis III). Unguis basal and posterior auxiliary lamellae well developed (Fig. 3C–E). Unguiculus 0.5–0.6 as long as unguis.</p><p>ABD. IV STERNUM AND FURCA. Abd. IV sternum with 2 +2 neosminthuroid chaetae and 2 + 2 chaetae. Manubrium with 2+2 posterior chaetae and 1+ 1 pegs with convex tip articulated with a corresponding concavity of the dens (Fig. 3G). Proximal subsegment of dens with a posterior chaeta (Fig. 3G); distal subsegment posteriorly with two basal spines and one chaeta at the middle. Anterior side of dens with five apical spines, spines without elongated apex (Fig. 3G). Dens ordinary, as in Fig. 3G. Mucro smooth, without teeth (Fig. 3G).</p><p>ABD. VI: ordinary with nine dorsal chaetae; each anal valve with a chaeta. Mature females with 8+ 8 ventral chaetae each anal valve with a chaeta av and several granular crests; mature females with 6+6 to 8+ 8 ventral chaetae. Genital plate: female with 2+2 chaetae. Male unknown.</p><p>TENACULUM AND VENTRAL TUBE. Tenaculum with 3+3 hook-like teeth (Fig. 3F). Ventral tube bulky with two apical pairs of chaetae.</p><p>Distribution and ecology</p><p>So far known only from the type locality, where it co-exists with M. minimus .</p><p>Molecular data</p><p>One topotype specimen sequenced (sample code 46-Q23-086), BOLD process id CSCOL002-25.</p></div>	https://treatment.plazi.org/id/0C0C6C18FFBEFF8B7C43FE2AFABAFC10	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Panina, Ksenia;Bedos, Anne;Deharveng, Louis;Schneider, Clément	Panina, Ksenia, Bedos, Anne, Deharveng, Louis, Schneider, Clément (2026): Three new species of the genus Megalothorax (Collembola: Neelidae) from France. European Journal of Taxonomy 1034: 162-180, DOI: 10.5852/ejt.2026.1034.3153, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3153/14041
0C0C6C18FFBAFF877C33FC0CFDEFFA11.text	0C0C6C18FFBAFF877C33FC0CFDEFFA11.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Megalothorax cellarincola Panina & Bedos & Deharveng & Schneider 2026	<div><p>Megalothorax cellarincola sp. nov.</p><p>urn:lsid:zoobank.org:act: DC2D90F0-4C71-426E-9D20-466D80EAA45A</p><p>Figs 1E, 4–5, 8, Tables 1–2</p><p>Diagnosis</p><p>Megalothorax cellarincola sp. nov. can be attributed to the incertus -group in understanding of Schneider &amp; D’Haese (2013). The new species shows all characters of this group: Abd IV sternum with 3+ 3 chaetae, inner sensilla of sensory fields globular, retinaculum with 4 +4 teeth, connection of channels with linea ventralis crossed on the head, abdomen with 2 + 2 globular sensilla (s2, s3), basomedian fields of labium with 4+4 chaetae. Characters of M. cellarincola are the presence of s3 sensilla, globular inner sensilla and serrated mucro. Another unique character is the presence of strong lanceolate chaetae on the back of the head and almost all over the body (in other species only the setae of the back of the head are thickened and lanceolate in shape).</p><p>In chaetotaxy, the new species resembles M. laevis Schneider et al., 2018, apart from the absence (vs presence in M. laevis) chaetae β3 and ζ4 on abdomen. In addition, M. cellarincola sp. nov. has chaeta β2 (absent in M. laevis) and serrated mucro (vs smooth in M. laevis). Megalothorax cellarincola is similar in chaetotaxy to M. perspicillum Schneider et al., 2013, excepting the presence of chaeta β1 (vs its absence in M. perspicillum) and the absence of cuticular channels on the body (vs its presence in M. perspicillum). The widespread species M. incertus differs from the new species by the absence of chaeta a3 on thorax II (vs its presence in M. cellarincola).</p><p>Of the incompletely described species, the new species can be compared with M. interruptus Hüther, 1967 from Sudan, which is also closely related to M. laevis . In addition to the strong lanceolate chaetae on the back of the head and almost all over the body, M. cellarincola sp. nov. differs from M. interruptus in the serrated mucro (vs smooth mucro in M. interruptus) and 4 +4 teeth on retinaculum (vs 3 + 3 in M. interruptus).</p><p>Etymology</p><p>The name is formed from the late latin ‘ cellārium ’ (‘storeroom’) and ‘ incola ’ (‘inhabitant’) and refers to the known habitat of this species.</p><p>Type material</p><p>Holotype FRANCE • 1 ♀; Puy-de-Dôme, Clermont-Ferrand, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=3.084&amp;materialsCitation.latitude=45.778" title="Search Plazi for locations around (long 3.084/lat 45.778)">Centre Ancient district</a>; 3.084° E, 45.778° N (visited basements were within a 500 m radius of given geocoordinates); 19 Oct. 2014; Schneider leg.; underground basement, dry to humid soil, in some places with bait (pieces of vegetables); SMNG, sample code no. CS.017.FR, slide no. SMNG-APT-AA04656 .</p><p>Paratypes (9 ♀♀, 1 ♂ and 3 juvs) FRANCE • 6 ♀♀; Puy-de-Dôme, Clermont-Ferrand, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=3.084&amp;materialsCitation.latitude=45.778" title="Search Plazi for locations around (long 3.084/lat 45.778)">Centre Ancient district</a>; 3.084° E, 45.778° N (visited basements were within a 500 m radius of given geocoordinates); 19 Oct. 2014; Schneider leg.; underground basement, dry to humid soil, in some places with bait (pieces of vegetables)Apterygota collection SMNG, slides nos SMNG-APT-AA04657 to 62 • 1 ♂; same data as for preceding; Apterygota collection SMNG, slide no. SMNG-APT-AA04663 • 3 juvs; same data as for preceding; Apterygota collection SMNG, slides nos SMNG-APT-AA04664 to 66 • 3 ♀♀; same data as for preceding; MPSU, slides nos CS.17.FR-67, CS.016.FR-60, CS.018.FR-73 .</p><p>Other material</p><p>FRANCE • some specs kept in ethanol, number unknown due to possible ambiguity with co-occurring young M. minimus; same data as for holotype • several specs in ethanol, number unknown due to possible ambiguity with co-occurring young M. minimus; same data as for holotype; Apterygota collection SMNG, tubes no. SMNG-APT-EA-003-002–004 .</p><p>Description</p><p>GENERAL ASPECT. Habitus and segmentation typical of the genus. Body length up to 300 µm. Specimens whitish in alcohol (Fig. 1E). General chaetotaxy typical of the genus, trichobothria not studied. Most chaetae lanceolate on body, but some are of ordinary morphology.</p><p>INTEGUMENT. Secondary granulation made of the usual dorsal rough granules. Integumentary channels extending laterally and dorsally in anterior and posterior parts of head. Anterior canal making the full circle around the head, branching near chaeta pr.a. (Fig. 4B). Channels connection with linea ventralis crossed.</p><p>SENSORY FIELDS AND WAX RODS (Fig. 4A–B). Sensory fields (sf 1–6) and their inner sensilla, as well as wax rods wrc1–7 with typical distribution for the genus. All inner sensilla of sensory fields are globular. MOUTHPARTS. Labrum as typical of the incertus -group with tips of a1-chaetae pointing forward (Fig. 4C). Chaetae a1 with three external teeth. Chaetae a2 with one small external tooth. Labium with 4 + 4 proximal chaetae (Fig. 4D). Basomedian field with 3+3 chaetae. Labial palp (Fig. 4D), as common for the genus (A, B, C, D, E, b1, b2, d1, d 2, 2e, H, h1, h2). Oral fold and maxillary outer lobe as typical of the genus, with one sublobal hair (Fig. 4E). Maxillary head without strong modification. Mandibula ordinary (Fig. 4F).</p><p>HEAD CHAETOTAXY. Forehead chaetotaxy as on Fig. 4B. Clypeal-labral formula: a0; 2, 4, 5, 4, 5, 4. Chaeta a 0 present. Dorsal posterior area with 18 strong lanceolate chaetae (Fig. 4B). Posterior chaetae lanceolate, longer and stronger than anterior chaetae. Ventral side with three pairs of post-labial chaetae.</p><p>ANTENNAL CHAETOTAXY (Fig. 5A–B). Ant. I and II with one and four chaetae, respectively. Ant. III with eight chaetae and two long S-chaetae (S1 and S4). Striations of Ant III sensory organ short sensilla (S2 and S3) distinguishable in light microscopy. Ant. IV with six chaetae (including X-chaeta) and ten S-chaetae. Sensory organ with Sx, Sy, Or, a, Sa. Organite (Or) of Ant IV short, seems apically flared. Summary on antennal chaetotaxy provided in Table 1.</p><p>BODY CHAETOTAXY. Th. II with 12+ 12 chaetae, 1+ 1 tubular and curved s1-sensilla (Fig. 4A). Chaetae a1, a4, p1, p2 and p4 longer and stronger than other, lanceolate. Th. III with 10 +10 chaetae (some chaetae more lanceolate), 6+6 free wax-rods (wrc 1–6). Chaeta a5 is longer and stronger than chaeta a6. Abd I–V terga with 17+17 ordinary chaetae (some chaetae around sf 6 longer and lanceolate), with 1+1 wrc (wrc 7 ordinary), 2 +2 globular sensilla s2 and s3 (Fig. 4A). Sensilla s3 bigger than s2.</p><p>LEGS CHAETOTAXY. Typical of the genus (Table 2), consisting of ordinary chaetae of variable size (Fig. 5C– E).</p><p>CLAWS. Claw III bulkier than claw I and II. Claws subequal in unguis length (with a trend as unguis I&gt; unguis II&gt; unguis III). Unguis basal and posterior auxiliary lamellae (la, lp and Bp) well developed (Fig. 5C–E). Unguiculus 0.5–0.6 as long as unguis.</p><p>ABD. IV STERNUM AND FURCA. Abd. IV sternum with 2 +2 neosminthuroid chaetae and 2 + 2 chaetae. Manubrium with 1+1 posterior chaetae (Fig. 5G). Proximal subsegment of dens with a posterior chaeta (Fig. 5G); distal subsegment posteriorly with two basal spines and one chaeta at the middle. Anterior side of dens with five apical spines, spines ordinary without elongated apex (Fig. 5G). Dens ordinary, as in Fig. 5G. Mucro with thin lamellae, with ~8 teeth on each posterior lamella (Fig. 5G).</p><p>ABD. VI. Typical of the genus: with nine dorsal chaetae; each anal valve with a chaeta av and several granular crests; mature females with 6+ 6 to 8 + 8 ventral chaetae. Genital plate: female with 2 + 2 chaetae. Male genital plate not studied (preparation unsuitable).</p><p>TENACULUM AND VENTRAL TUBE. Tenaculum with 4+4 hook-like teeth (Fig. 5F). Ventral tube bulky with two apical pairs of chaetae.</p><p>Distribution and ecology</p><p>Megalothorax cellarincola sp. nov. is so far only known from its type locality, where it coexists with M. minimus . It is an inhabitant of man-made subterranean habitats, similarly to Megalothorax sanctistephani Christian, 1998 .</p><p>Molecular data</p><p>Two topotype specimens sequenced (sample code CS.17.FR and CS.16.FR), BOLD process id CSCOL003-25 and CSCOL004-25.</p></div>	https://treatment.plazi.org/id/0C0C6C18FFBAFF877C33FC0CFDEFFA11	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Panina, Ksenia;Bedos, Anne;Deharveng, Louis;Schneider, Clément	Panina, Ksenia, Bedos, Anne, Deharveng, Louis, Schneider, Clément (2026): Three new species of the genus Megalothorax (Collembola: Neelidae) from France. European Journal of Taxonomy 1034: 162-180, DOI: 10.5852/ejt.2026.1034.3153, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3153/14041
0C0C6C18FFB6FF9C7C2DFA0FFB79FB55.text	0C0C6C18FFB6FF9C7C2DFA0FFB79FB55.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Megalothorax poinsotae Panina & Bedos & Deharveng & Schneider 2026	<div><p>Megalothorax poinsotae sp. nov.</p><p>urn:lsid:zoobank.org:act: 491D0472-F156-4FCA-9C13-386A825FFF93</p><p>Figs 1F, 6–8, Tables 1–2</p><p>Diagnosis</p><p>Megalothorax poinsotae sp. nov. can be attributed to the incertus -group with the common character states combination: cross connection of head channels with linea ventralis, serrated mucro, presence of s3 sensilla on abdomen, globular inner sensilla, 2+ 2 chaetae in the basolateral field of labium, 3 +3 chaetae on Abd. IV sternites and 4+ 4 teeth on the retinaculum.</p><p>This species is similar to M. cellarincola sp. nov. by the presence of strong lanceolate chaetae on the back of the head and some parts of the thorax. These species are distinguished by the chaetotaxy of the abdomen. In M. poinsotae sp. nov. chaetae p4 and ε1 are absent (vs present in M. cellarincola).</p><p>In chaetotaxy, the new species resembles M. perspicillum, apart from the absence (vs presence in M. perspicillum) of chaeta β3 and ε1 on abdomen. In M. poinsotae sp. nov. cuticular channels on abdomen are absent (vs present in M. perspicillum).</p><p>Megalothorax poinsotae sp. nov. also resembles M. laevis Schneider et al., 2018, apart from the absence (vs presence in M. laevis) of the chaetae p4, β3 and ε1 on abdomen. In addition, M. poinsotae has chaeta β2 present (vs absent in M. laevis) and serrated mucro (vs smooth mucro in M. laevis).</p><p>The widespread M. incertus differs from the new species by the absence of chaeta a3 on thorax II and chaeta ζ4 on abdomen (vs present in M. poinsotae sp. nov.). The closely related species M. boerneri has a chaetotaxy similar to M. poinsotae, but the chaetae β3, β4 and ε1 are absent in the new species (vs present in M. boerneri).</p><p>Etymology</p><p>The species is dedicated posthumously to Nicole Poinsot, for her work on the taxonomy and ecology of Collembola in Provence. Poinsot reported a so-called M. minimus (this species was ambiguously defined at the time) in the sansouire, an halophilous vegetal formation of Camargue (Poinsot 1975).</p><p>Type material</p><p>Holotype FRANCE • ♀; Var, Sainte-Maxime, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=6.65684&amp;materialsCitation.latitude=43.31301" title="Search Plazi for locations around (long 6.65684/lat 43.31301)">plage de la Madrague</a>, litter and algae among Salicornia L.; 6.65684° E, 43.31301° N; ca 1 m a.s.l.; 27 Jan. 2024; Deharveng and Bedos leg; SMNG, sample code no. 83-556, slide no. SMNG-APT-AA04667.</p><p>Paratypes (6 ♀♀) FRANCE • 2 ♀♀; Var, Sainte-Maxime, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=6.65684&amp;materialsCitation.latitude=43.31301" title="Search Plazi for locations around (long 6.65684/lat 43.31301)">plage de la Madrague</a>; 6.65684° E, 43.31301° N; ca 1 m a.s.l.; 27 Jan. 2024; Deharveng and Bedos leg; litter and algae among Salicornia L.; Apterygota collection SMNG, slides nos SMNG-APT-AA04668 to 71 • 2 ♀♀; same data as for preceding; MPSU, slides nos 83-556–spec1, 83-556–spec2 • 2 ♀♀; same data as for preceding; MNHN, slides nos 83-556A, 83-556B .</p><p>Other material</p><p>FRANCE • several specs in ethanol; Var, Sainte-Maxime, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=6.65684&amp;materialsCitation.latitude=43.31301" title="Search Plazi for locations around (long 6.65684/lat 43.31301)">plage de la Madrague</a>, litter and algae among Salicornia L; 6.65684° E, 43.31301° N; ca 1 m a.s.l.; 27 Jan. 2024; Deharveng and Bedos leg; Apterygota collection SMNG, tubes no. SMNG-APT-EA-003-005 • several specs in ethanol; same data as for preceding; MNHN .</p><p>Morphological description</p><p>GENERAL ASPECT. Habitus and segmentation typical of the genus. Body length up to 400 µm. Specimens whitish in ethanol. Body chaetotaxy sparse including chaetae, s-chaetae, trichobothria, neosminthuroid chaetae, wax-rods and inner sensilla within sensory fields 2–6. Most of chaetae lanceolate on body, but some are of ordinary morphology.</p><p>INTEGUMENT. Secondary granulation made of the usual dorsal rough granules. Integumentary channels not reaching the posterior part of the head, limited to short ventral channels forming a cross connection with the linea ventralis.</p><p>SENSORY FIELDS AND WAX RODS (Fig. 6A). Sensory fields (sf 1–6) and their inner sensilla, as well as wax rods wrc1–7 with typical distribution of the genus. Inner sensilla of sf 2 broad flame-shaped, the other s are globular.</p><p>MOUTHPARTS. Labrum as typical of the incertus -group with tips of a1-chaetae straightening up to point forward, a1 with two small external teeth, a2 external teeth imperceptible.</p><p>LABIUM. With 4+4 proximal chaetae, basomedian fields with 3+3 chaetae, basolateral fields with 2 +2 chaetae (Fig. 6E). Labial palp (Fig. 6E) as common for the genus (A, B, C, D, E, b1, b2, d1, d 2, 2e, H, h1, h2). Oral fold and maxillary outer lobe as typical of the genus, with two sublobal hair (Fig. 6F). Maxillary head without strong modification (Fig. 6C). Mandibula ordinary (Fig. 6D).</p><p>HEAD CHAETOTAXY. Forehead chaetotaxy as on Fig. 6B. Clypeal-labral formula: a0; 2, 4, 5, 4, 5, 4. Chaeta a0 present. Dorsal posterior area with 18 ordinary chaetae (Fig. 6B). Ventral side with three pairs of post-labial chaetae. Trend for posterior chaetae to be longer and stronger than anterior chaetae, including posterior lanceolate chaetae.</p><p>ANTENNAL CHAETOTAXY (Fig. 7A, B). Ant. I and II with one and four chaetae, respectively. Ant. III with nine chaetae and two long S-chaetae (S1 and S4). Striations of Ant III sensory organ short sensilla (S2 and S3) distinguishable in light microscopy. Ant. IV with five chaetae (X-chaeta present) and ten S-chaetae. Sensory organ with Sx, Sy, Or, a, Sa. Organite (Or) of Ant IV short, seems apically flared. Summary on antennal chaetotaxy provided in Table 1.</p><p>BODY CHAETOTAXY. Chaetotaxy of thorax and abdomen reduced. Th. II with 12 +12 chaetae, 1+1 tubular and curved s1-sensilla (Fig. 6A). All chaetae ordinary. Th. III with 9 + 9 chaetae (chaeta p4 absent) and 5+5 free wax-rods (wrc 2 absent). Chaeta a5 is longer and stronger than chaeta a6. Abd I–V terga with 17 +17 ordinary chaetae (chaetae β3, β4, ε1 absent) with 1+1 wrc (wrc 7 ordinary), 2+ 2 globular sensilla s2 and s3 (Fig. 6A). Sensilla s3 bigger than s2.</p><p>LEGS CHAETOTAXY. Typical of the genus (Table 2), consisting of ordinary chaetae of variable size (Fig. 7C– E).</p><p>CLAWS. Claw III bulkier than claw I and II. Claws subequal in unguis length (with a trend as unguis I&gt; unguis II&gt; unguis III). Unguis basal and posterior auxiliary lamellae well developed (Figs 7 C-E). Unguiculus 0.5–0.6 as long as unguis.</p><p>ABD. IV STERNUM AND FURCa. Abd. IV sternum with 2 +2 neosminthuroid chaetae and 2 + 2 chaetae. Manubrium with 1+ 1 posterior chaetae (Fig. 7F). Proximal subsegment of dens with a posterior chaeta (Fig. 7F); distal subsegment posteriorly with two basal spines and one chaeta at the middle. Anterior side of dens with five apical spines, spines without elongated apex (Fig. 7F). Dens ordinary, as in Fig. 7F. Mucro serrated (Fig. 7F).</p><p>ABD. VI. Typical of the genus: with nine dorsal chaetae; each anal valve with a chaeta. Mature females with 8+8 ventral chaetae. Genital plate: female with 2+ 2 chaetae. Male unknown.</p><p>TENACULUM AND VENTRAL TUBE. Tenaculum with 4+4 hook-like teeth. Ventral tube bulky with two apical pairs of chaetae.</p><p>Distribution and ecology</p><p>So far known only from the type locality, it is the first species of Megalothorax to be found in a true littoral habitat (Salicornetium). Three species of Collembola were present in the same sample with Megalothorax poinsotae sp. nov.: an Hypogastrura sp., and two typically littoral species of Isotomidae: Archisotoma sp. and Halisotoma sp.</p><p>Molecular data</p><p>One topotype specimen sequenced (sample code 83-556), BOLD process id CSCOL001-25.</p></div>	https://treatment.plazi.org/id/0C0C6C18FFB6FF9C7C2DFA0FFB79FB55	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Panina, Ksenia;Bedos, Anne;Deharveng, Louis;Schneider, Clément	Panina, Ksenia, Bedos, Anne, Deharveng, Louis, Schneider, Clément (2026): Three new species of the genus Megalothorax (Collembola: Neelidae) from France. European Journal of Taxonomy 1034: 162-180, DOI: 10.5852/ejt.2026.1034.3153, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3153/14041
