Iphitime doederleini

Iphitime doederleini (Marenzeller, 1902) (Figs 6–8) Japanese name: mino-isome. Iphitime doederleini Marenzeller, 1902, p. 579 –580. Coelobranchus papillosus Izuka, 1912, p. 135, pl. 15, figs 1–7. Materials examined: NSMT-Pol 113618: fixed and preserved in 10% formalin in seawater, collected in Sagami Bay, Kanagawa, Japan, on 2 December 2021 from Macrocheira kaempferi (Fig. 4A, B) caught with a gill net set at depths of 250–300 m; NSMT-Pol 113619, fixed and preserved in 70% ethanol, collection date and locality same above, jaws dissected. NSMT-Pol 113620, fixed and preserved in 70% ethanol, on 22 September 2022, from M. kaempferi collected off Shirahama. Coordination for sampling localities unavailable. Description Body flattened, tapered in posterior region; 15–21 mm in length and 1.6 mm in maximum width (Fig. 6C). Prostomium rounded without eyespots (Fig. 6D). Two short digitiform antennae 250 μm in length, dorsally protruding forward on prostomium, without extending beyond prostomium (Figs 6D, 7A, 8A). Peristomium represented by two apodous achaetous rings, 1st ring as long as 2nd ring (Figs 6D, 7A). Chaetae present at first segment after peristomium (Figs 7A, 8A). Branchiae palmate inserted dorsolaterally, present from chaetiger 1 (Figs 6D, E, 7C, 8A). A pair of pygidial cirri digitiform, 320 μm in length (Fig. 6F), slightly longer than antennae (Fig. 6D). Chaetae comprising of 2–4 supraacicular simple and 7 subacicular compound chaetae (Figs7C–E, 8B–D). Subacicular compound chaetae with serration (Figs 7E, 8D). Jaws of K-type present (Fig. 6B). Sex unknown in the specimen examined. Rod-like mandibles 240 μm in length, strongly sclerotized, comprising of two shafts distally widening and smooth; distal cutting edge without serration (Fig. 7B). K-type maxillae 340 μm in length, with smooth ice tong-shaped forceps and paired free-denticles (Fig. 7B). Distribution and habitat: The species is found in the branchial cavity of Macrocheira kaempferi (Fig. 6A, B). Since its first discovery byMarenzeller (1902) in Japanese waters (specific locality not documented), this species has been reported at depths of 548– 640 m in Sagami Bay, under the junior synonym of Coelobranchus papillosus Izuka, 1912 (Izuka 1912, Imajima and Hartman 1964). It has also been reported from Seto and Minabe, Wakayama, Japan (Japan Initiative for Biodiversity Information; https://gbif.jp/ gbif_search/dataset? datasetId=snet-1096-105). Remarks: Specimens collected from Sagami Bay conform to the original description of I. doderleini as well as C. papillosus (Marenzeller 1902, Izuka 1912).