Annotated checklist of the springtails (Hexapoda: Collembola) of the Collo massif, northeastern Algeria Author Bendjaballah, Mohamed Author Zoughailech, Abdelmalek Author Brahim-Bounab, Hayette Author Hamra-Kroua, Salah Laboratoire de Biosystématique et Écologie des Arthropodes, Faculté des Sciences de la Nature et de la Vie, Université des Frères Mentouri Constantine 1, Route de Ain El-Bey, 25000 Constantine (Algeria) Author Bedos, Anne Author Deharveng, Louis Institut de Systématique, Évolution, Biodiversité (ISYEB), Muséum national d’Histoire naturelle, CNRS, Sorbonne Université, EPHE, case postale 50, 57 rue Cuvier, F- 75231 Paris cedex 05 (France) dehar. louis @ wanadoo. fr louis@wanadoo.fr text Zoosystema 2018 2018-08-21 40 16 389 414 journal article 9262 10.5252/zoosystema2018v40a16 8be054d5-36e9-4fd4-a655-ae67d67fac0c 1638-9387 4335964 urn:lsid:zoobank.org:pub:698D3C19-FDF6-4557-8E71-BE10006E9612 Ceratophysella gibbosa (Bagnall, 1940) Achorutes gibbosus Bagnall, 1940: 165 . Ceratophysella gibbosa – Stach 1949: 138. CITATION FROM ALGERIA OUTSIDE COLLO. — Baquero et al. (2009: 68) . DISTRIBUTION. — Holarctic region ( Thibaud et al. 2004 ). REMARK Rare in our samples, only collected in Oued Z’hor. Specimens are identical to those of Europe for diagnostic characters, but Collo populations include a large proportion of strongly modified ecomorphic specimens, all immatures, which are not present in European populations we have seen so far: maxilla and mandible are degenerated and desclerified, chaetae of labium are shortened, eye size is reduced, unguiculus and mucro are shortened, uneven boss of Abd. V is stronger, and dorsal macrochaetae are distinctly capitated.