Pagurixus dissimilis Osawa and Komai, 2007

Komai, Tomoyuki, 2010, New species and new records of the hermit crab genus Pagurixus Melin, 1939 (Crustacea: Decapoda: Anomura: Paguridae) from the Indo-West Pacific, Journal of Natural History 44 (21 - 22), pp. 1269-1342 : 1286

Pagurixus dissimilis Osawa and Komai, 2007

Pagurixus dissimilis Osawa and Komai 2007, p 42 , Figures 1–4 , 5A, B .

Material examined

New Caledonia. LIFOU, stn 1421, Santal Bay, Lifou Island, Loyalty Islands, 20°52.4′S, 167°08.5′E, 4 m, 26–27 November 2000, 1 male SL 1.5 mm (MNHN-Pg 8280); stn 1429, similar locality, 20°47.5′S, 167°07.7′E, 8–18 m, 24 November 2000, 1 male SL 1.4 mm (MNHN-Pg 8281); stn 1434, Santal Bay , 20°52.5′S, 167°08.1′E, 5–20 m, 6 November 2000, 1 ovigerous female SL 1.5 mm (MNHN-Pg 8282); stn 1449, N of Cape Aimé Martin , Santal Bay , 20°45.8′S, 167°01.65′S, 17 m, 1 male, 1 female, 3 ovigerous females, not measured (MNHN-Pg 8283); stn 1437, Gaatcha Bay , 20°55.5′S, 167°04.2′E, 10–30 m, 10 November 2000, 1 male SL 1.3 mm (MNHN-Pg 8284); stn 1440, Bay of Chépénéhé , Santal Bay , 20°47.2′S, 167°08.6′E, 15–35 m, 16 November 2000, 1 female SL 1.4 mm (MNHN-Pg 8285); stn 1450, N of Cape Aimé Martin , Santal Bay , 20°45.8′S, 167°01.65′E, 27–31 m, 21 November 2000, 2 males SL 1.2, 1.2 mm, 2 females SL 1.1, 1.3 mm, 1 ovigerous female SL 1.1 mm, 1 juvenile SL 0.9 mm (MNHN-Pg 8286); stn 1452, between Cape Mandé and Cape Lefévre, Santal Bay, 20°54.6′S, 167°02.1′E, 2–25 m, 2 males SL 1.1, 1.4 mm, 2 ovigerous females SL 1.0, 1.1 mm (MNHN-Pg 8287); stn 1453, between Cape Mandé and Cape Lefévre, Santal Bay, 20°54.6′S, 167°02.1′E, 21–30 m, 22 November 2000, 1 male SL 1.4 mm (MNHN-Pg 8288); stn 1457, Ngoni , Santal Bay , Lifou Island , Loyalty Islands, 20°46.8′S, 167°02.75′E, 5–10 m, 1 male SL 1.3 mm, 1 female SL 1.2 mm, 1 ovigerous female SL 1.2 mm (MNHN-Pg 8289); same data, 1 male SL 0.9 mm (MNHN-Pg 8290) . Touho , 10 m, 8 September 1993 , SCUBA diving, 1 male SL 1.46 mm (MNHN- Pg 8291) .

Distribution

Previously known only from southern Japan, 3–5 m in depth. The present material greatly extends the geographical range of this species to New Caledonia; subtidal to 31 m.

Figures

Figure 1. Measurements used in text. (A) Carpus of cheliped; (B) ambulatory leg. Notes: L, length; W, width.

Figure 2. Pagurixus anceps (Forest, 1954), syntype, male (shield length 1.14 mm; MNHN-Pg 577). (A) Shield and cephalic appendages, dorsal view; (B) right second pereopod, lateral view; (C) same, dactylus, mesial view; (D) left third pereopod, lateral view; (E) same, dactylus, mesial view; (F) left fourth pereopod, lateral view; (G) sixth thoracic sternite, ventral view; (H) coxae of fifth pereopods and eighth thoracic sternite, ventral view; (I) telson, dorsal view. Notes: Scale bars, (A–E) 0.5 mm; (F–I) 0.25 mm.

Figure 3. Pagurixus anceps (Forest, 1954). Chelipeds from syntype lot (MNHN-Pg 577), host specimens could not be specified. (A) Right chela and carpus, dorsal view; (B) right cheliped, mesial view; (C) right cheliped, lateral view; (D) left chela and carpus, dorsal view; (E) left cheliped, mesial view; (F) left cheliped, lateral view. Note: Scale bar, 0.5 mm.

Figure 4. Pagurixus anceps (Forest, 1954). (A) Male (shield length [SL] 1.63 mm; CBM-ZC 9570) shield and cephalic appendages, dorsal view; (B–F) ovigerous female (SL 1.24 mm; CBM-ZC 9571): (B) ultimate segment and flagella of left antennule, lateral view; (C) right chela and carpus, dorsal view; (D) right cheliped, mesial view; (E) right cheliped, lateral view; (F) left third pereopod, lateral view. Note: Scale bars, 0.5 mm.

Figure 5. Pagurixus aurantiaca sp. nov. holotype, male (shield length 1.61 mm; CBM-ZC 9644). (A) Shield and cephalic appendages, dorsal view; (B) ultimate segment and flagella of left antennule, lateral view; (C) right second pereopod, lateral view; (D) right second pereopod, dactylus, mesial view; (E) right second pereopod, carpus, mesial view; (F) left third pereopod, lateral view; (G) left third pereopod, dactylus, mesial view; (H) left fourth pereopod, lateral view; (I) right fourth pereopod, lateral view; (J) sixth thoracic sternite, ventral view; (K) coxae of fifth pereopods and eighth thoracic sternite, ventral view; (L) telson, dorsal view. Note: Scale bars, 0.5 mm.