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Bibliographic Details
Main Authors:	Panina, Ksenia, Bedos, Anne, Deharveng, Louis, Schneider, Clément
Format:	Recurso digital
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Published:	Zenodo 2026
Subjects:	Biodiversity Taxonomy Animalia Arthropoda Collembola Neelipleona Neelidae Megalothorax Megalothorax cellarincola
Online Access:	https://doi.org/10.5281/zenodo.18546773
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Megalothorax cellarincola sp. nov.urn:lsid:zoobank.org:act: DC2D90F0-4C71-426E-9D20-466D80EAA45AFigs 1E, 4–5, 8, Tables 1–2DiagnosisMegalothorax cellarincola sp. nov. can be attributed to the incertus -group in understanding of Schneider & 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).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).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).EtymologyThe name is formed from the late latin ‘ cell&amacr;rium ’ (‘storeroom’) and ‘ incola ’ (‘inhabitant’) and refers to the known habitat of this species.Type materialHolotype FRANCE • 1 &female;; Puy-de-Dôme, Clermont-Ferrand, Centre Ancient district; 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.Paratypes (9 &female;&female;, 1 &male; and 3 juvs) FRANCE • 6 &female;&female;; Puy-de-Dôme, Clermont-Ferrand, Centre Ancient district; 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 &male;; 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 &female;&female;; same data as for preceding; MPSU, slides nos CS.17.FR-67, CS.016.FR-60, CS.018.FR-73.Other materialFRANCE • 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.DescriptionGENERAL 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.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.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).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.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.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.LEGS CHAETOTAXY. Typical of the genus (Table 2), consisting of ordinary chaetae of variable size (Fig. 5C– E).CLAWS. Claw III bulkier than claw I and II. Claws subequal in unguis length (with a trend as unguis I> unguis II> 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.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).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).TENACULUM AND VENTRAL TUBE. Tenaculum with 4+4 hook-like teeth (Fig. 5F). Ventral tube bulky with two apical pairs of chaetae.Distribution and ecologyMegalothorax 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.Molecular dataTwo topotype specimens sequenced (sample code CS.17.FR and CS.16.FR), BOLD process id CSCOL003-25 and CSCOL004-25.

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