Chad

Among the 55 vascular plant species known only from Chad (PhytoKeys) are Commicarpus raynalii (JSTOR), Aponogeton fotianus (p. 73 of ville-ge.ch WM pdf), Gladiolus iroensis (p. 52 of ResearchGate pdf), Justicia hedrenii (BHL), and Verbena dalloniana (GBIF). Most of the endemic species are from the Tibesti Mountains including a mint Nepeta tibestica (JSTOR), an everlasting Helychrisum monodianum (JSTOR) (p. 325 of ResearchGate pdf), Ephedra tilhoana (GBIF), Wahlenbergia tibestica (GBIF) (IUCN), Pentas tibestica (JSTOR), Oldenlandia toussidana (GBIF), Lotus tibesticus (JSTOR), Erodium toussidanum (GBIF), Silene mirei (p. 151 of ResearchGate pdf), Foeniculum scoparium (JSTOR), Campanula monodiana (GBIF), Artemisia tilhoana (p. 321 of ResearchGate pdf), a tree Lannea sessilifoliata (GBIF), and Agrostis tibestica (JSTOR). Quezeliantha (formerly Quezelia) is an endemic genus (JSTOR) (p. 146 of ResearchGate pdf).

A blind snake Letheobia logonensis (MNHN) described in 2019 has recently been considered a synonym of the more widespread Letheobia weidholzi (Reptile Database).

Freshwater fish include Barilius shariensis (Google Books) (IUCN), a cyprinid known only from the type specimen. A cichlid Sarotherodon borkouanus (Google Books) from Saharan oases is sometimes considered distinct from the widespread Sarotherodon galilaeus (Cichlid Room Companion). Another cichlid Astatotilapia tchadensis (ScienceDirect) (GBIF) is known with certainty only from the Ounianga Serir lakes, but is likely more widespread.

Insects unique to Chad include a butterfly Cigaritis baghirmii (Wikispecies) (Oxford), a moth Callhyccoda mirei (GBIF), a katydid Eurycorypha laticercis (GBIF), a cricket Oecanthus decorsei (GBIF), a water scorpion Laccotrephes niala (Discover Life), the ants Camponotus tilhoi (AntWiki) and Carebara diabolica (AntWiki pdf), a jewel beetle Agrilus pseudopurpuratus (MNHN), a ground beetle Bradybaenus robustus (fig. 2 on p. 6 of zobodat pdf), the leaf-chafers Pegylis tchadensis (p. 5 of Hannetons WM pdf) and Adoretus vanderberghei (p. 18 of BJE WM pdf), a longhorn beetle Apomecynoides tchadensis (BHL), and a robber fly Euscelidia hyalina (GBIF).

Scorpions endemic to Chad include Pandinus vachoni (BHL), Buthus labuschagnei (GBIF), and nine species described in 2012 (KMK pdf). Other endemic invertebrates include a wall spider Oecobius tibesti (fr.wikipedia), a solifuge Galeodes wadaicus (fr.wikipedia), a centipede Asanada tchadensis (ChiloBase), the pseudoscorpions Minniza exorbitans (zobodat pdf) and Amblyolpium simoni (BHL), a water flea Diaphanosoma bopingi (ResearchGate), the copepods Haplocyclops henrii (GBIF) and Parastenocaris joi (GBIF), the freshwater snails Gabbiella ouniangaensis (fig. C at Springer Link) and Gabbiella neothaumaeformis (IUCN) (BHL) and Bulinus obtusus (africamuseum.be) (IUCN), and a freshwater worm Aulodrilus tchadensis (p. 20 of IRD pdf).

Important ecoregions in Chad include the Tibesti-Jebel Uweinat Montane Xeric Woodland (WWF WM) and the Lake Chad Flooded Savanna (WWF WM). Lists of endemic species, especially plants, can be found in the "Identification des Priorites Pour la Conservation de la Diversite Biologique" (Centre d'echange du Tchad WM).