Apograpsus paantu (Naruse & Kishino, 2006), 2008

Komai, Tomoyuki & Wada, Keiji, 2008, A Revision Of The Estuarine Crab Genus Ilyograpsus Barnard, 1955 (Crustacea: Decapoda: Brachyura: Macrophthalmidae), With Descriptions Of A New Genus And One New Species, Raffles Bulletin of Zoology 56 (2), pp. 357-384 : 379-380

Apograpsus paantu (Naruse & Kishino, 2006) ,

new combination ( Figs. 16–18 )

Ilyograpsus paantu Naruse & Kishino, 2006: 68 , Figs. 2a , 3 , 4 .

Name bearing type. – Holotype: male (cl 3.4 mm), RUMF-ZC- 237, Tima River, Nago, Okinawa Island , 13 Feb.2005, coll. T. Naruse.

Material examined. – Holotype (see above). Paratypes - 1 male (cl 3.4 mm), 2 females (cl 4.7, 5.8 mm), 3 ovigerous females (cl 4.7–5.6 mm), RUMF-ZC-238, same data as holotype ; 1 female (cl 5.4 mm), CBM-ZC 8492 , Atetsu River estuary, Amami-oshima Island, 4 Aug.2000, coll. Y. Yonezawa; 1 ovigerous female (cl 6.4 mm), CBM-ZC 8493 , Yanma , Sumiyo Village , Amami-oshima Island , 31 Mar.2002, coll. T. Kishino ; 1 male (cl 3.9 mm), 1 female (cl 6.1 mm), CBM-ZC 8834 , Yagaji Port, Yagaji Island, Okinawa Islands , 1.5 m, coll. T. Komai , 17 Mar.2006 ; 2 females (cl 3.3, 3.3 mm), CBM-ZC, Sonai Port, Iriomote Island, Yaeyama Islands , 2 m, 29 Jun.2005, mooring rope, coll. T. Komai .

Diagnosis. – See generic diagnosis given above. Detailed description and illustrations is given by Naruse & Kishino (2006).

Size. – Males cl 3.4–3.9 mm; females cl 3.3–6.4 mm, ovigerous females cl 4.7–6.4 mm.

Distribution and habitat. – Known only from the Ryukyu Islands of southern Japan: Amami-ohshima Island, Okinawa Islands, and Iriomote Island. According to Naruse & Kishino (2006), the type specimens were collected from riverbeds of brackish waters, with a pebbly-muddy substratum. The newly obtained specimens were collected from small fishing ports facing sea shore, with a muddy substratum. It is suggested that the species is fairly tolerant against changes of salinity.

derived by isolation of peripheral populations of I. paludicola or common ancestor of the three taxa. Apograpsus paantu is known only from the Ryukyu Islands in southwestern Japan. Collections of species of Ilyograpsus and Apograpsus are still rather scarce, and further study is needed to document real distributional pattern of each species.

Figures

Fig. 16. Apograpsus paantu (Naruse & Kishino, 2006), new combination.A, male (cl 3.4 mm), RUMF-ZC-238, paratype, Tima River estuary, Nago, Okinawa Island, Japan; B, female (cl 6.4 mm), paratype, CBM-ZC 8493, Yanma, Sumiyo, Amami-ohshima Island, Japan.

Fig. 17. Apograpsus paantu (Naruse & Kishino, 2006), new combination. A–E, H, I, male (cl 3.9 mm), CBM-ZC 8834, Yagaji Port, Yagaji Island, Okinawa Islands, Japan. F, G, male (cl 3.4 mm), paratype, RUMF-ZC-238, Tima River estuary, Nago, Okinawa Island. A, carapace, ocular peduncles, and antennae, dorsal view (setae partially omitted); B, cephalothorax and cephalic appendages, frontal view; C, right lower orbital margin, ventral view; D, pleon, ventral view; E, left third maxilliped, ventral view; F, left fourth pereopod, dorsal view; G, left fifth pereopod, dorsal view; H, left first gonopod, ventral view; I, same, distal part, dorsal view. Scale bars: A, B, D = 1 mm; E–I = 0.5 mm.

Fig. 18. Apograpsus paantu (Naruse & Kishino, 2006), new combination. Female (cl 6.4 mm), paratype, CBM-ZC 8493, Yanma, Sumiyo, Amami-ohshima Island, Japan. A, carapace, ocular peduncles and antennae, dorsal view; B, merus of left cheliped, outer view; C, chela and carpus of left cheliped, dorsal view; D, left chela, outer view; E, left fourth pereopod, dorsal view; F, left fifth pereopod, dorsal view. Scale bars: A = 2 mm; B–F = 1 mm.

Fig. 2. Ilyograpsus rhizophorae Barnard, 1955. Male (cl 6.4 mm), paratype of Ilyograpsus vannini Sawada, Hosogi & Sakai, 2005, RMNH-D 26501, south of Massawa, Gulf of Zula, Ethiopia. Entire animal in dorsal view.

Fig. 3. Ilyograpsus rhizophorae Barnard, 1955. Male (cl 6.5 mm), paratype of Ilyograpsus vannini Sawada, Hosogi & Sakai, 2005, RMNH- D 26501, south of Massawa, Gulf of Zula, Ethiopia: A, carapace, ocular peduncles and antennae, dorsal view (setae omitted); B, left lower orbital margin and external orbital tooth, ventral view; C, anterior part of thoracic sternum, ventral view; D, pleon, ventral view; E, left cheliped, dorsal view; F, same, merus, outer view; G, same, chela, outer view; H, left fourth pereopod, dorsal view; I, left fifth pereopod, dorsal view; J, left first gonopod, ventral view; K, same, ventrolateral view; L, same, distal part, dorsal view. Scales: A = 2 mm; B–I = 1 mm; J–L = 0.5 mm.

Fig. 4. Ilyograpsus rhizophorae Barnard, 1955. A, male (cl 5.0 mm), paratype of Ilyograpsus vannini Sawada, Hosogi & Sakai, 2005, RMNH-D 26501, south of Massawa, Gulf of Zula, Ethiopia; B–E, male (cl 3.8 mm), MNHN-B 12846, Nozy Bé, Madagascar. A, left part of carapace, left ocular peduncle and antenna, dorsal view; B, left cheliped, dorsal view; C, same, chela, outer view; D, right first gonopod, dorsal view; E, same, ventrolateral view. Scale bars: A, B, D = 1 mm; C, E = 0.5 mm.