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| Orobdella ibukifukuyamai Nakano, 2022 |
Abstract
A large-type sexannulate leech species, Orobdella ibukifukuyamai sp. nov., from Kii-Oshima Island, Japan, is described based on morphologic and molecular data. Phylogenetic analyses using nuclear 18S rRNA, 28S rRNA, histone H3, mitochondrial cytochrome c oxidase subunit I, tRNACys, tRNAMet, 12S rRNA, tRNAVal, 16S rRNA, tRNALeu and NADH dehydrogenase subunit 1 markers showed that O. ibukifukuyamai formed a clade with the sexannulate O. okanoi Nakano, 2016 and O. yamaneae Nakano, 2016 and octannulate O. nakahamai Nakano, 2016, which are endemic to Shikoku island, Japan.
Key Words: Hirudinida, Erpobdelliformes, Japanese Archipelago, molecular phylogeny
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| Orobdella ibukifukuyamai sp. nov., holotype, KUZ Z4031. A. Dorsal view; B. Ventral view; C. Dorsal view of live animal. Scale bars: 20 mm (same bar for A, B). |
Family Orobdellidae Nakano, Ramlah & Hikida, 2012
Genus Orobdella Oka, 1895
Type species: Orobdella whitmani Oka, 1895,
fixed by subsequent designation (Soós 1966).
Orobdella ibukifukuyamai sp. nov.
Diagnosis: Body length of mature individuals reaching ~15 cm. Somite VII quinquannulate, somites VIII–XXV sexannulate, b1 = b2 < a2 = b5 > c11 = c12 (especially mid-body somites). Male gonopore in slightly anterior to middle of, or in middle of somite XI c12, female gonopore in somite XIII b2/a2, posterior to gastropore, gonopores separated by 1/2 + 8 annuli. Pharynx reaching to somite XIV a2/b5–b5. Gastropore conspicuous, in somite XIII b2/a2. Gastroporal duct thick tubular. Paired epididymides in somites XVI–XVIII, occupying 11–12 annuli. Atrial cornua developed, ovate, without pre-atrial loop. Dorsal surface reddish brown in life.
Etymology: The specific name is dedicated to Mr Ibuki Fukuyama who collected the specimens of the new species.
Takafumi Nakano. 2022. A New Sexannulate Species of Orobdella (Hirudinea, Arhynchobdellida, Orobdellidae) from Kii-Oshima Island, Japan. Evolutionary Systematics. 6(2): 135-142. DOI: 10.3897/evolsyst.6.86308
