Leptocheliidae, Lang, 1973

Sato, Akari, Arakawa, Kazuharu & Kakui, Keiichi, 2023, Two new species in Leptocheliidae (Crustacea: Peracarida: Tanaidacea) from Japan, with notes on their phylogenetic position and aspects of morphology, Zoologischer Anzeiger (Zool. Anz.) 306, pp. 51-68 : 64-65

3.2. COI-based phylogeny within Leptocheliidae

Most phylogenetic relationships in our COI tree ( Fig. 13 ) show faint support, but six moderately or strongly supported clades are evident:

Clade A contains the other five clades; Clade A1; Clade A2 contains Clade A2α; and Clade A3 contains Clade A3α. Clade A, comprising all leptocheliid species except C. sublitoralis sp. nov., is moderately well supported (SH-aLRT = 98.2%; UFBoot = 88%). Clade A1 is highly supported (SH-aLRT = 99.9%; UFBoot = 99%). Clade A2 (SH-aLRT = 99.1%; UFBoot = 100%) contains two Chondrochelia species from Middle America and a Hargeria clade (Clade A2α). Clade A3 is moderately well supported (SH-aLRT = 95.7%; UFBoot = 86%) and includes three leptocheliine species— N. japonica from Japan, Leptochelia forresti ( Stebbing, 1896) from Florida, USA (its type locality is Antigua and Barbuda in the Caribbean; Stebbing, 1896), and “ Leptochelia longichelipes ” from Belize (this species name is not available; see Jarquín-- Gonzalez´et al., 2015)—along with a Konariinae clade (Clade A3α). Leptocheliinae and Chondrochelia were not monophyletic in our tree.

Figures

Fig. 13. ML tree for leptocheliid tanaidaceans based on COI (405 positions); numbers near nodes are SH-aLRT (left of slash) and ultrafast bootstrap (UFBoot; right of slash) values in percent; only values of SH-aLRT ≥70% and UFBoot ≥80% are shown; *, unavailable name (see Jarquín-Gonz´alez et al., 2015). Scale at bottom indicates branch length in substitutions per site.